당신은 주제를 찾고 있습니까 “qsfp28 vs qsfp-dd – QSFP+ vs. QSFP28 Transceivers: The Breakdown“? 다음 카테고리의 웹사이트 https://ppa.charoenmotorcycles.com 에서 귀하의 모든 질문에 답변해 드립니다: ppa.charoenmotorcycles.com/blog. 바로 아래에서 답을 찾을 수 있습니다. 작성자 AddOn Networks 이(가) 작성한 기사에는 조회수 5,347회 및 좋아요 74개 개의 좋아요가 있습니다.
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d여기에서 QSFP+ vs. QSFP28 Transceivers: The Breakdown – qsfp28 vs qsfp-dd 주제에 대한 세부정보를 참조하세요
We’ve compared SFP and QSFP transceivers on this channel before, but in this video, we’re breaking down QSFP+ and QSFP28 transceivers. As quad small form factor pluggables, QSFP+ and QSFP28 both have the ability to use 4 channels of data, however, what are their main capabilities and what are the differences between them? Find out in this video.
Learn more: https://www.addonnetworks.com/solutions/insights/qsfp-vs-qsfp28-transceivers-the-breakdown
#QSFP #QSFP28 #Transceivers
qsfp28 vs qsfp-dd 주제에 대한 자세한 내용은 여기를 참조하세요.
Differences Between QSFP-DD and QSFP+/QSFP28/QSFP56 …
Bandwth & Application … The QSFP-DD modules can support 400Gbps while QSFP+/QSFP28/QSFP56 can only reach 40Gbps/100Gbps/200Gbps respectively.
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QSFP-DD vs QSFP28 – Differences? – EDGE Optical Solutions ©
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Qsfp28 Vs Qsfp-Dd | Qsfp+ Vs. Qsfp28 Transceivers
d여기에서 QSFP+ vs. QSFP28 Transceivers: The Breakdown – qsfp28 vs qsfp-dd 주제에 대한 세부정보를 참조하세요. We’ve compared SFP and QSFP …
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Phân biệt, so sánh các bộ thu phát quang (module quang …
để truyền dữ liệu. Vì vậy sự khác biệt giữa SFP vs SFP +, SFP28 vs SFP +, QSFP vs QSFP28 là gì? QSFP28 có tương thích với QSFP+ không? Chúng ta có thể sử dụng …
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QSFP56 vs QSFP-DD – Vitex, LLC
QSFP56 vs QSFP-DD: Comparative Advantages and Disadvantages · QSFP56 was designed to support 200G applications and cannot accommodate an upgrade …
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주제와 관련된 이미지 qsfp28 vs qsfp-dd
주제와 관련된 더 많은 사진을 참조하십시오 QSFP+ vs. QSFP28 Transceivers: The Breakdown. 댓글에서 더 많은 관련 이미지를 보거나 필요한 경우 더 많은 관련 기사를 볼 수 있습니다.
주제에 대한 기사 평가 qsfp28 vs qsfp-dd
- Author: AddOn Networks
- Views: 조회수 5,347회
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- Date Published: 2021. 5. 18.
- Video Url link: https://www.youtube.com/watch?v=71EjCWCmZ14
Differences Between QSFP-DD and QSFP+/QSFP28/QSFP56/OSFP/CFP8/COBO
QSFP-DD, as the smallest form factor for 400G transceivers, offers industry’s highest bandwidth density while leveraging the backward compatibility to lower-speed QSFP pluggable modules and cables, making it popular among the fiber optic manufacturers. As the newest hot type of optical transceivers in 400G high-speed applications, QSFP-DD is often compared with other modules such as QSFP56, OSFP, CFP8, and COBO. So what are the differences among these optical modules? This post will illustrate them thoroughly.
QSFP-DD Wiki
QSFP-DD (also called QSFP56-DD) stands for Quad Small Form Factor Pluggable Double Density, which is fully compliant with IEEE802.3bs and QSFP-DD MSA standards. The “double density” means the doubling of the number of high-speed electrical interfaces that the module supports compared with a standard QSFP28 module. The data rate of each channel can reach 25Gb/s through NRZ modulation technology, realizing 200G network transmission. Also, the data rate of each channel can reach 50Gb/s by the PAM4 modulation technology, achieving 400G network transmission, which is suitable for high-performance computing data center and cloud network. For more information about PAM4 modulation technology, please visit: PAM4: Learn 400G Ethernet From Here.
The advantages of QSFP-DD form factor are as follows:
Backward compatibility: allowing the QSFP-DD to support existing QSFP modules (such as QSFP+, QSFP28, QSFP56, etc.) and provide flexibility for end-users and system designers.
Adopting the 2×1 stacked integrated cage/connector to support the one-high cage connector and two-high stack cage connector system.
SMT connector and 1xN cage design: this kind of design can enable thermal support of at least 12W per module. The higher thermal reduces the requirement for heat dissipation capabilities of transceivers, thus reducing some unnecessary costs.
ASIC design: supporting multiple interface rates and fully backward compatible with QSFP+ and QSFP28 modules, thus reducing port and equipment deployment costs.
QSFP-DD vs QSFP+/QSFP28/QSFP56
QSFP-DD, QSFP+, QSFP28 and QSFP56 belong to the QSFP form factor, but what are the differences among them? The differences are explained in the following descriptions.
Structure
In terms of the appearance, the width, length and thickness of the QSFP-DD are the same as QSFP+, QSFP28 and QSFP56. But the QSFP-DD module is equipped with an 8-lane electrical interface rather than a 4-lane like other QSFP modules and the ASIC ports of QSFP-DD are doubled to support existing interfaces such as CAUI-4. Therefore, the mechanical interface of QSFP-DD on the host board is slightly deeper than that of the other QSFP system transceivers to accommodate the extra row of contacts.
Bandwidth & Application
The QSFP-DD modules can support 400Gbps while QSFP+/QSFP28/QSFP56 can only reach 40Gbps/100Gbps/200Gbps respectively. Therefore, QSFP-DD connectors are used in 400G optical modules, DACs and AOCs, and applied for the 400G data center interconnections. And QSFP+/QSFP28/QSFP56 modules and DAC/AOC are used for 40G/100G/200G networks. interconnection.
Backward Compatibility
As mentioned above, the QSFP-DD can be backward compatible with the previous QSFP system transceiver modules. In other words, based on the previous form factor, the QSFP-DD has been technically upgraded to support increased bandwidth. And its backward compatibility can avoid existing equipment replacement on the scale and effectively reduce the network upgrade cost.
Form Factor QSFP-DD QSFP56 QSFP28 QSFP+ Released Year 2016 2018 2016 2010 Number of Electrical Interface Lanes 8 4 4 4 Single Channel Rate 25Gbps/50Gbps 50Gbps 25Gbps 10Gbps Modulation Technology NRZ/PAM4 PAM4 NRZ NRZ Backward Compatibility QSFP+/QSFP28/QSFP56 QSFP+/QSFP28 QSFP+ /
QSFP-DD vs OSFP/CFP8/COBO
QSFP-DD (QSFP56-DD) and OSFP/CFP8/COBO are the form factors of 400G optics on the market, the differences of them are listed below:
QSFP-DD vs OSFP
OSFP is a new pluggable form factor with eight high speed electrical lanes that will initially support 400Gb/s (8x50G) or reach up to 800Gb/s. The width, length and thickness of QSFP-DD are 18.35mm, 89.4mm and 8.5mm, while those of OSFP are 22.58mm, 107.8mm and 13.0mm. It is obvious that the OSFP form factor is slightly wider and deeper than the QSFP-DD, but it still supports 36 OSFP ports per 1U front panel, enabling 14.4Tb/s per 1U.
Generally, the power consumption of QSFP-DD is 7-12W, while the OSFP can reach 12-15W. The lower the power consumption, the better the performance of the transceiver. Unlike the QSFP-DD, OSFP can’t be backward compatible with QSFP+/QSFP28 since it has a larger size than that of QSFP+/QSFP28.
QSFP-DD vs CFP8
Featuring a 41.5mm*107.5mm*9.5mm form factor, the CFP8 module delivers four times more bandwidth than existing 100G solutions. Its electrical interface has been generally specified to allow for 16×25 Gb/s and 8×50 Gb/s mode. Since the size of CFP8 is almost three times larger than that of QSFP-DD, the power consumption of CFP8 is much higher than QSFP-DD. Meanwhile, the CFP8 can’t be used on QSFP+/QSFP28 ports. The maximum bandwidth of CFP8 and QSFP-DD is 400Gb/s, but CFP8 only supports in the form of 16x25G or 8x50G while QSFP-DD also supports both 200Gb/s (8x25G).
QSFP-DD vs COBO
COBO stands for Consortium for On-Board Optics, it can be installed internally to the line-card equipment in a controlled environment, which lacks flexibility. And it doesn’t support hot-pluggable, so it is more difficult for COBO modules to maintain than QSFP-DD. Additionally, the COBO form factor has two electrical interfaces——one eight lane and the other sixteen lane to meet both 1x400G and 2x400G transmission requirements.
The following chart shows the market maturity of the QSFP-DD, OSFP, CFP8 and COBO form factors. The larger the numbers, the higher the market maturity of these form factors.
Performance CFP8 OSFP QSFP-DD COBO Volume 1 2 3 4 Power Consumption 3 2 1 4 Cost 1 3 4 2 Maturity 4 3 2 1 Compatibility 3 2 4 1 Difficulty for Operation & Maintenance 2 3 4 1 Overall Ratings 14 15 18 13
We can see from the table that the overall rating of QSFP-DD and OSFP form factors are higher than other form factors. So the QSFP-DD and OSFP are more popular with fiber optic manufacturers. While the former is suitable for data center applications and the latter often applied for telecommunications applications. For more types of 400G transceivers, please refer to How Many 400G Transceiver Types Are in the Market? for more detailed information.
Will QSFP-DD Be Popular in 800G Ethernet?
The QSFP-DD (QSFP56-DD) is more suitable for data center applications than OSFP. With the concentration of east-west traffic in the data center and the increasing pressure on the internal bandwidth of the data center, the time gap between the application of high-speed optical modules in the telecom market and the data center market is gradually shortening. The 400G optics will be applied widely. That is, QSFP-DD will benefit from the 400G Ethernet and ushered in a good development prospect.
As 400G becomes commercially available on a large scale, single-wave 100G technology is set to mature, laying the groundwork for the arrival of 800G. Recently, the QSFP-DD800 Multi-Source Agreement (MSA) organization released the first version of the QSFP-DD800 transceiver hardware specification, which is dedicated to the continuation of the current QSFP-DD form factor to support a single channel rate of 100Gbps 8-channel new generation QSFP-DD800. This also means that 800G might still adopt the QSFP-DD form factor to bring greater advantages and values for Internet service providers.
Comparing 200G/400G capable form factors (QSFP-DD vs. QSFP+/QSFP28/OSFP/CFP9/COBO)
Achieving 400G network speeds requires utilizing the industry’s highest performing fiber optics. From top-of-the-line bandwidth density to the flexibility of backwards compatibility, the quad small form pluggable double density (QSFP-DD) is one of the most popular choices for cutting edge fiber network design.
But what makes this form factor such a standout above the others? Why choose QSFP-DD over other form factors like QSFP56, OSFP, CFP8, or even COBO? Read on to learn more.
Defining the QSFP-DD form factor
The QSFP-DD is IEEE802.3bs and MSA standard compliant, however, it doubles the number of interfaces that the standard QSFP28 form supports.
When using standard NRZ modulation, each interface can support 25GB/s for a total of 200G throughput (8x25G). If additional lane density is needed, higher level PAM4 modulation technologies can be leveraged to deliver a 400G (8x50G) signal.
The flexibility of this form factor not only offers a path to 200G but also creates a cost-effective path to scale to 400G in the future. The savvy data center, enterprise network, or service provider network operator can easily leverage either modulation scheme for reducing per port hardware costs for high-performance computing or cloud-based processing applications.
How does QSFP-DD differ from its predecessors (QSFP+, QSFP28, QSFP56)?
There are many functional and physical differences, but let’s begin with its structure and composition.
Although the footprint of the physical transceiver is the same, its electrical interface is quite different. Since this is a double density module, it carries 8 lanes instead of 4. In turn, this increases the amount of ASIC ports to support CAUI-4 and other existing interfaces.
While QSFP+, QSFP28, and QSFP56 can achieve 40G, 100G, and 200G data rates, the lower lane count means that even with PAM4 modulation 400G data rates are not possible. For applications involving 400G data center interconnects, leveraging QSFP-DD transceivers, direct attach cables (DACs), and active optical cables (AOCs) creates a high-performance link capable of scaling to next generation data rates.
A key tenant of the scalability of QSFP-DD transceivers is that they are also backwards compatible with its predecessors. Already deployed QSFP+ transceivers can remain in use without compromising performance of the network beyond the QSFP-DD. This keeps upgrade costs in check by compartmentalizing and deferring replacement of QSFP to QSFP-DD modules to a later time.
Form Factor QSFP-DD QSFP56 QSFP28 QSFP+ Backward Compatibility QSFP+, QSFP28, QSFP56 QSFP+, QSFP28 QSFP+ N/A Per Channel Data Rate 25G/50G 50G 25G 10G Modulation Type Supported NRZ & PAM4 PAM4 NRZ NRZ Lane Count 8 4 4 4
Why QSFP-DD over other 400G capable form factors (OSFP, CFP8, & COBO)?
When compared to the octal small form pluggable (OSFP), the QSFP-DD is quite similar. Both utilize eight lanes to achieve 400G data rates (8x50G), however, the OSFP is planned to later support 800G signals. The QSFP-DD is a better option for those needing the interim step to 200G not only for cost, but also due to reduced power consumption.
OSFP tends to be a better choice for operators immediately moving to 400G with desire for later scalability, however, OSFP is not backwards compatible with QSFP+ and its other forms. This means a move to 400G will come at a higher immediate cost with OSFP with savings later realized by deferring further cost at the 800G upgrade.
Relative form factor footprints (courtesy of Ethernet Alliance)
CFP8 is another popular form factor for 400G applications due to its support for both 16x25G and 8x50G, however, it has a much larger physical footprint as well as in elevated power consumption levels. Unfortunately it is neither backwards compatible nor scalable to 800G.
Our final current option is the unique consortium for on-board optics (COBO). Though newer, this type is installed in the line-card. This installation method puts many features of the QSFP-DD out of reach for a COBO, such as lacking the flexibility provided by a hot-pluggable optic. Through an 8 lane 1x400G or a 16 lane 2x400G connector interface, however, it can support both 400G and 800G.
Is QSFP-DD preferred for 400G deployments?
Yes, but it also depends on the application. If you don’t need the 200G interim step, there may be deferred operational and capital expense savings by moving straight to 400G. However, if budget or downtime is a concern, the interim step may allow for deferred initial expenses and long term operational savings.
The market is moving towards adopting QSFP-DD as a form factor for 800G, with the first Multi-Source Agreement (MSA) specifications for a QSFP-DD800 form factor already released. While the future may hold other technological advancements in the 800G race, it appears the QSFP-DD form factor is here to stay.
Make the connection your network needs. Contact us now for your next 200G/400G upgrade.
EDGE Optical Solutions ©
QSFP-DD vs QSFP28/QSFP56 – What Are The Differences?
Intro
QSFP-DD vs QSFP28 / QSFP56 how we got here with so many different QSFP’s ? The rapid growth of cloud data center networking and interconnections are pushing the technology development to meet the ever higher bandwidth connectivity demands. From the rise of 40G-QSFP transceivers and ever successful advancement to the 100G-QSFP28 form-factor, the next major step is prevalence of 200G and 400G Ethernet technology with QSFP-DD form-factor optical transceivers.
Current widespread use of 100G QSFP28 technology transceiver form-factor, followed by 200G QSFP56 transceiver form-factor, have led to a completely new optical transceiver form-factor QSFP-DD.
Confused? Yep, it is a bit, this article will help to quickly understand the main differences between QSFP-DD, QSFP56 and QSFP28.
1. QSFP-DD vs QSFP28 / QSFP56 Quick Overview
Form Factor QSFP-DD QSFP56 QSFP28 Data Rate 400G/200G 200G 100G Lane count 8 electrical 4 electrical 4 electrical Lane data rate 25 / 50 Gbps 50 Gbps 25 Gbps Modulation type NRZ / PAM4 PAM4 NRZ Power consumption 12 W 4 – 7.5 W < 3.5 W Connector types CS / LC LC / MPO / CS LC / MPO Dimensions 18.35 / 89.4 / 8.5mm 18.35 / 72.3 / 8.5mm 18.35 / 72.3 / 8.5mm 2. QSFP-DD vs QSFP28 / QSFP56 Difference 1 – Data Rate The first basic parameter which describes optical transceivers is data rate. Data rate is defined as the amount of data transmitted during a specified time period over a network. Different transceivers and respective networking technologies have different data rate values. QSFP-DD has the maximum data rate 200Gbps or 400Gbps depending on signal modulation technology used. Its main difference when compared to QSFP56 or QSFP28 is that QSFP-DD name states – double density, this means that its electrical lines are doubled from 4 to 8. 8 channels modulated with NRZ results of 25Gbps per channel, which totals to 200Gbps . . But 8 channels modulated with PAM4 results in 50Gbps per channel, which totals to 400Gbps. (Respectively, QSFP56 maximum data rate is 200Gbps, but QSFP28 is 100Gbps). Comparison of data rates basing on networking technologies: Ethernet technology standartizes following data rates for QSFP-DD – 212.5 Gbps, 425 Gbps. InfiniBand is an industry standard, channel-based, switched fabric interconnect architecture for server and storage connectivity. InfiniBand standartizes following data rates for QSFP28: 100G EDR, for QSFP-DD: 200G HDR, 400G NDR. The optical transport network (OTN) make up a generic Layer-1 transport network, enabling different service types to coexist and share the same infrastructure transparently, without affecting each other’s performance.OTN Optical Transport Network, specifies OTU4 for QSFP28 100G, OTUc2 for 200G, OTUc4 for 400G applications, QSFP-DD respectively. Fiber Channel: 128GFC (24850 56.1 PAM-4) released in 2021, with more higher data rate generations to be released in future – 256GFC at 2024. Summary: QSFP-DD QSFP56 QSFP28 Ethernet 212.5Gbps, 425Gbps 212.5Gbps 106.25Gbps InfiniBand 400G NDR, 200G HDR 200G HDR 100G EDR OTN OTUc4, OTUc2 OTUc2 OTU4 Fiber Channel – – 128GFC 3. QSFP-DD vs QSFP28 / QSFP56 Difference 2 – Modulation Type Next notable difference factor is transceiver modulation. Optical transceiver consists of a laser which is able to emit light, and a modulator. Optical modulator is a device which can be used for manipulating a property of light. It determines the quality of transmissions between transmission equipment. Regarding pluggable optical transceivers, it is the intensity of the light that is modulated. Engineers have long utilized non-return to zero (NRZ) modulation for 1G, 10G and 25G, using host side forward error correction (FEC) to enable longer distance transmissions. For higher data rate 40G and 100G industry introduced signal parallelization of 10G and 25G NRZ modulated signals. In short lower speed optics 1G, 10G, 25G and most 100G optics, modulates the intensity of the light at NRZ two levels, and is therefore binary. Downside for NRZ modulation technology for 200G, 400G and other faster data rates is not efficient as compared to smaller data rates. As a result, network scientists have developed PAM4 modulation for these high bandwidth data rates. Different modulation technologies: NRZ – Non-Return-to-Zero, is a 2 level binary code using low and high signal levels to represent the 1/0 information of a digital logic signal. NRZ can only transmit 1 bit, i.e. a 0 or 1, of information per signal symbol period. PAM4 – Pulse Amplitude Modulation 4 is a 4 level signal modulation format used to transmit signals. Each signal level can represent 2 bits of logic information. This means that with PAM4 modulation information can be transmitted in two times shorter time. Or two times more information at the same time. Practically we can see this with a 400G transceiver. This transceiver has a built in DSP gearbox which takes 8x 25GBaud PAM4 signal and converts it to 4x 50GBaud PAM4 signal. And so that it is with PAM4 modulation 4x 50GBaud scales to 4x 100Gbps lines, which then are multiplexed and fully gives 400Gbps data rate. Picture – PAM4 four distinct levels to encode 2 bits of data: Summary: Transceiver type Modulation 100G QSFP28 NRZ 200G QSFP56 NRZ / PAM4 400G QSFP-DD PAM4 4. QSFP-DD vs QSFP28 / QSFP56 Difference 3 – Power Consumption Optical transceiver power consumption is closely related to host device total power budget. The bigger the transceivers power consumption, the smaller count of transceivers usable in host equipment. So the smaller power consumption of transceiver and host equipment altogether – the better performance and smaller environment impact. QSFP-DD transceiver specification allows maximum power consumption of 12 Watts. QSFP56 transceiver specification allows maximum power consumption of <5 Watts. QSFP28 transceiver specification allows maximum power consumption of <3.5 Watts. General rule of thumb, the smaller the power consumption the smaller the module temperature, better transceiver reliability and better overall performance of transceiver. Summary: Transceiver type Power consumption 100G QSFP28 <3.5 Watts 200G QSFP56 <5 Watts 400G QSFP-DD <12 Watts 5. QSFP-DD vs QSFP28 / QSFP56 Difference 4 – Connector Types Optical transceivers have two ends. One end is the electrical connector which connects to the host equipment (switch, router etc..) other end is laser output which connects to optical fiber. QSFP28, QSFP56 transceivers have a 38pin electrical interface which connects to the host device. But QSFP-DD as it is double density, has a double count of electrical pins – 76. This basically means that systems (host devices) which are designed with QSFP-DD port are backward compatible with QSFP56 and QSFP28 form factor transceivers. Practically this means that if you have an router with QSFP-DD ports, you can easily plug QSFP56 or QSFP28 in those same ports (before connecting check product data sheet if port logically supports QSFP56 or QSFP28 transceiver). Following picture shows us QSFP28 pads and additional pads which are used for QSFP-DD, to accommodate the double line interface. Optical transceivers on their respective ends have an optical connector compatible plug mechanism of female type. This connector can have the following type: LC, MPO or CS. Regarding the MPO cables we at EDGE Optics have separate article which can be red here. CS connector is the newest generation technology for connecting 200G and 400G optical interfaces. The CS connector consists of a Double LC type push-pull coupling mechanism which is by 40% smaller than our well known Duplex LC connector. The smaller footprint doubles up the connector density on the switch front panel if compared to LC connector. One QSFP-DD transceiver takes two CS connectors, one pair for transmission and one pair for receiving signals. Dual CS connector profile: CS connector: Transceiver type Connector 100G QSFP28 LC / MPO 200G QSFP56 LC / MPO / CS 400G QSFP-DD LC / CS 6. Difference 5 – Dimensions QSFP-DD is the latest developed and with highest data rate transceiver, it has some dimension differences if compared with QSFP56 and QSFP28 form factor transceivers. QSFP-DD is a slightly longer transceiver because of four extra electrical lines – which makes it a double density transceiver (the electrical interface contains a larger count of electrical pads – 76). QSFP-DD 18.35 / 89.4 / 8.5mm QSFP56 18.35 / 72.3 / 8.5mm QSFP28 18.35 / 72.3 / 8.5mm 7. More on QSFP-DD Form Factor and Module Types Type Fiber type Wavelength Number of lines Reach Optical modulation Optical connector 400GBASE-SR8 QSFP-DD MMF Tx/Rx 850/850nm 8x53Gbps 100m (OM4) PAM4 MTP/MPO 400GBASE-DR4 QSFP-DD SMF Tx/Rx 4×1310 PSM4 4×106.25 Gbps 500m (OS2) PAM4 MTP/MPO 400GBASE-DR4+ QSFP-DD SMF Tx/Rx 4×1310 PSM4 4×106.25 Gbps 2km (OS2) PAM4 MTP/MPO 400GBASE-FR4 QSFP-DD SMF Tx/Rx 4 CWDM lanes:1271, 1291, 1311, 1331. 4×106.25 Gbps 2km (OS2) PAM4 LC 400GBASE-LR4 QSFP-DD SMF Tx/Rx 4 CWDM lanes:1271, 1291, 1311, 1331 4×106.25 Gbps 10km (OS2) PAM4 LC 400GBASE-ER4 Lite QSFP-DD SMF Tx/Rx LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4×106.25 Gbps 40km (OS2) PAM4 LC 400GBASE-LR8 QSFP-DD SMF Tx/Rx 8 LWDM lanes:1273, 1277, 1282, 1286, 1295, 1300, 1304, 1309 8x53Gbps 10km (OS2) PAM4 LC 400GBASE-ER8 QSFP-DD SMF Tx/Rx 8 LWDM lanes:1273, 1277, 1282, 1286, 1295, 1300, 1304, 1309 8x53Gbps 40km (OS2) PAM4 LC 200GBASE-LR4 QSFP-DD SMF Tx/Rx LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x53Gbps 10km (OS2) PAM4 LC 200GBASE-ER4 QSFP-DD SMF Tx/Rx LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x53Gbps 40km (OS2) PAM4 LC 8. More on QSFP56 Form Factor and Module Types Type Fiber type Wavelength Number of lines Reach Optical modulation Optical connector 200GBASE-SR4 QSFP56 MMF Tx/Rx 850/850nm 4x53Gbps 100m (OM4) PAM4 MTP/MPO 200GBASE-DR4 QSFP56 SMF Tx/Rx 1310/1310nm 4x53Gbps 500m (OS2) PAM4 MTP/MPO 200GBASE-FR4 QSFP56 SMF Tx/Rx 4 CWDM lanes: 1271, 1291, 1311, 1331. 4x53Gbps 2km (OS2) PAM4 LC 200GBASE-LR4 QSFP56 SMF Tx/Rx LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x53Gbps 10/20km (OS2) with FEC PAM4 LC 200GBASE-ER4 QSFP56 SMF Tx/Rx LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x53Gbps 40km (OS2) PAM4 LC 9. More on QSFP28 Form Factor and Module Types Type Fiber type Wavelength Number of lines Reach Optical modulation Optical connector 100GBASE-SR4 QSFP28 MMF Tx/Rx 850/850nm 4x25Gbps 100m (OM4) NRZ MTP/MPO 100GBASE-DR4 QSFP28 SMF Tx/Rx 4 CWDM lanes: 1271, 1291, 1311,1331 4x25Gbps 500m (OS2) NRZ LC 100GBASE-PSM4 IR4 QSFP28 SMF Tx/Rx 1310/1310nm 4x25Gbps 2km (OS2) NRZ MTP/MPO 100GBASE-CWDM4 QSFP28 SMF Tx/Rx 4 CWDM lanes: 1271, 1291, 1311,1331 4x25Gbps 2km (OS2) NRZ LC 100GBASE-LR4 QSFP28 SMF Tx/Rx 4 LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x25Gbps 10km (OS2) NRZ LC 100G 4WDM-10 QSFP28 SMF Tx/Rx 4 CWDM lanes: 1271, 1291, 1311,1331 4x25Gbps 10km (OS2) NRZ LC 100GBASE-ER4 Lite QSFP28 SMF Tx/Rx 4 LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x25Gbps 40km with host FEC (OS2) NRZ LC 100GBASE-ZR4 QSFP28 SMF Tx/Rx 4 LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x25Gbps 80km with host FEC (OS2) NRZ LC 100G-DR Single Lambda PAM4 QSFP28 SMF Tx/Rx: 1304.5-1317.5nm 1x100Gbps 500m (OS2) PAM4 LC 100G-FR Single Lambda PAM4 QSFP28 SMF Tx/Rx: 1304.5-1317.5nm 1x100Gbps 2km (OS2) PAM4 LC 100G-LR Single Lambda PAM4 QSFP28 SMF Tx/Rx: 1304.5-1317.5nm 1x100Gbps 10km (OS2) PAM4 LC 100GBASE-LR4 RX Only QSFP28 SMF Rx only: 4 LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x25Gbps 10km (OS2) NRZ LC 100GBASE-ER4 Lite RX Only QSFP28 SMF Rx only: 4 LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x25Gbps 40km (OS2) NRZ LC 10. Conclusion QSFP-DD, QSFP56 and QSFP28 transceivers differ in many ways. The most significant difference for the newest QSFP-DD transceivers is that this double density form factor packs a double 4 lane electrical interface which totals to 8 electrical lanes. This allows it to support data rates up to 400Gbps. The 8 lane technology packed in QSFP-DD increases its dimensions in length up to 89.4mm, (if compared to QSFP56 and QSFP28 72.3mm). Additionally QSFP-DD has a double count of electrical pad connector lines (76) to accommodate the 8 lane interface. QSFP-DD unlocks its abilities to achieve 400Gbps data rate with great help of PAM4 modulation. This modulation technique is new for optical transceivers, because previously the 2 level NRZ modulation technique was used in last generation 100G-QSFP28 transceivers. Instead PAM4 modulation is 4 level amplitude modulation where each level can represent 2 bits of information. As a result with PAM4 modulation information can be transmitted in two times shorter time – or respectively two times more information at the same time. With this principle QSFP-DD can achieve higher than ever data rates. As the QSFP-DD packs in itself new technologies, its power consumption has risen to unseen levels. QSFP-DD peak power consumption can be up to 12 Watts. Which by comparison to QSFP28 3.5 Watts is a notable increase. The increased power consumption allows it to achieve the promised 400Gbps data rate. Both QSFP-DD and QSFP56 in the near future will be equipped with the latest technology CS connector. The CS connector consists of a Double LC type push-pull coupling mechanism which is by far smaller than the classical Duplex LC connector. The smaller footprint doubles up the connector density on the switch front panel. As well it enables two 400Gbps QSFP-DD transceiver connectivity with each other or signal break out options to 2x 200Gbps QSFP56 transceivers. QSFP-DD form factor is used for 400Gbps and a few 200Gbps transceivers. The 400G QSFP-DD transceiver types most importantly differ between each other with working distance and wavelengths used. For example 400GBASE-SR8 is the only one version QSFP-DD transceiver which uses Multi-Mode fiber, and can achieve 100 meter distance. Up until the top 400GBASE-ER8 version which is Single-Mode fiber 40km reach version. And many more versions in between.
Difference between QSFP56 vs QSFP28 vs QSFP+
Jun. 10, 2022
The 200G QSFP56 optical module and the 200G QSFP-DD optical module are two mainstream solutions for 200G optical interconnects. The QSFP56 utilises mainstream digital signal processors (DSPs) to help cloud data centres meet the tough challenges of achieving more efficient optical interconnects at a flexible and scalable scale and low cost. This article will introduce you to the optical module 200G QSFP56 package technology and the difference between the QSFP56 package and the QSFP28 and QSFP+ packages.
Overview of 200G QSFP56 optical module packaging technology
The 200G QSFP56 optical module is an upgraded version of the 40G QSFP+ and 100G QSFP28 optical modules and is designed specifically for 200G Ethernet interconnects. modules. Depending on the transmission distance, 200G QSFP56 optical modules are divided into QSFP56 CR, SR, DR, FR and LR, which can be used for different distances on single-mode and multimode fibres.
200G QSFP56
In general, two 200G QSFP56 optical modules can be plugged into the corresponding switch port and connected with a single-mode or multimode fibre to achieve a 200G transmission rate. In addition, 200G transmission can also be achieved by inserting a QSFP56 DAC/AOC high-speed cable into the corresponding port. For 2x100G or 4x50G transmission, 200G QSFP56 to 2x100G QSFP28 branch cables and 200G QSFP56 to 4x50G SFP56 branch cables can be used to achieve this.
Difference between QSFP56 vs QSFP28 vs QSFP+
By name, QSFP56, QSFP28 and QSFP+ optical modules have the same package type, but they have different transmission rates, modulation techniques, interfaces, etc.
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100GBASE-QSFP28-CWDM4-10km Optical Transceiver Module
The QSFP56 package type can support 4x50G transmission to achieve a 200G transmission rate, while the QSFP+ module is an upgraded version of the QSFP module and can support 4x10G transmission for 10G Ethernet, 10G Fibre Channel and QDR InfiniBand. It can multiplex four channels to increase bandwidth and achieve 40Gbps transmission rates (10GBaud NRZ per channel). QSFP28 optical modules, like QSFP+ optical modules, contain 4 optical transmitters and 4 optical receivers to support 4x25G transmission, resulting in 100G transmission rates.
The main difference between the QSFP56 package and the QSFP+ and QSFP28 packages is that the QSFP56 no longer adopts the previous NRZ modulation technology, but instead adopts PAM4 modulation technology, which can achieve transmission rates of up to 50G per channel, allowing more data to be transmitted over existing fibre, making it more suitable for applications in hyperscale data centre networks.
40GBASE-QSFP+-PSM LR4-10km Optical Transceiver Module
200G QSFP56 to 400G QSFP-DD
With the rapid growth of data centres, the demand for data transmission is also increasing, driving the network towards higher bandwidth and higher density. There is now a new generation of 400G optical module packages on the market – the 400G QSFP-DD, where “DD” refers to dual-density, meaning that the number of channels in the 400G QSFP-DD has changed from four to eight, allowing for 400G transmission rates. This means that the number of channels in the 400G QSFP-DD has been changed from 4 to 8, enabling 400G transmission rates to be achieved.
The 400G QSFP-DD optical module is similar in size to the 200G QSFP56 optical module, but the 400G QSFP-DD optical module is backwards compatible with 40G QSFP+, 100G QSFP28, 200G QSFP56 and other QSFP packaged optical modules. This means that 200G QSFP56 optical modules can work on 400G QSFP-DD ports as long as the switch supports them. When using a 200G QSFP56 optical module on a 400G QSFP-DD port, the switch’s port will be configured for a 200G transmission rate instead of 400G.
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Differences Between QSFP-DD and QSFP28/OSFP/QSFP56/QSFP+/COBO/CFP8
The form factors of 400G optics in markets include QSFP-DD or QSFP56-DD and COBO/ OSFP/ CFP8, with the following differences:
CFP8 vs QSFP-DD
The CFP8 module, which has a physical factor of 41.5mm x 107.5mm x 9.5mm, provides four times the bandwidth of conventional 100G systems. Its electrical interface has been designed to provide 16 x 25 Gb per second and 8 x 50 Gb per second data rates. CFP8’s power consumption is much higher than QSFP-DD because its size is nearly three times that of QSFP-DD. The CFP8 is not compatible with QSFP+/QSFP28 ports. CFP8 and QSFP-DD both have a maximum bandwidth of 400 GB/s, however, CFP8 only supports 8x50G or 16x25G, whereas QSFP-DD supports both 200Gb/s and 400Gb/s (8x25G).
OSFP vs QSFP-DD
OSFP is a recent pluggable form factor with eight hi-speed electrical pathways that can handle 400Gb/s to 800Gb/s (8x50G). QSFP-DD is 18.35mm wide, 89.4mm long, and 8.5mm thick, whereas OSFP is 22.58mm wide, 107.8mm long, and 13.0mm thick. Although the OSFP form factor is somewhat deeper and wider than the QSFP-DD; still it supports 36 OSFP ports allowing for 14.4Tb/s per 1U.
In general, QSFP-DD consumes 7 to 12 watts of power, but the power consumption of the OSFP can reach up to 12 to 15 watts. The leaner the power expenditure the higher the performance of the optical transceiver. Because OSFP has larger dimensions, it cannot be fully compatible with QSFP+/QSFP28, unlike QSFP-DD.
COBO vs QSFP-DD
For on-board optics, COBO may be fitted in a controlled setting to a line-card kit that lacks flexibility. COBO modules are also more difficult to maintain than QSFP-DD since they do not support hot plugging. In addition, the COBO form factor comes with two electrical interfaces, one contains eight lanes and the other contains sixteen lanes, to support both types of transmission; 1x400G and 2x400G.
The following chart exhibits the market maturity of various form factors. In this chart, higher numbers reflect higher market maturity of different form factors.
Know Distinctions Between QSFP-DD & QSFP+/QSFP28/QSFP56/OSFP/CFP8/COBO
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QSFP-DD stands for Quad Small Form Factor Pluggable Double Density. QSFP-DD is though the smallest form factor of 400G transceivers, but provides with the high-density bandwidth in the entire industry, due to which it gained popularity all around.
However, as QSFP-DD, or we can say QSFP56-DD, (the other name of QSFP-DD) came into the market and gained popularity, there was a lot of comparisons made with the other form factors like QSFP56, OSFP, CFP8, and COBO. So, as the comparison of QSFP-DD is always made with the other form factors, in this post, we will thoroughly want to discuss what these all form factors are.
About QSFP-DD
QSFP-DD is the double density QSFP. The QSFP-DD complies with the IEEE802.3bs and QSFP-DD MSA standards. This connector seeing the demand for a higher bandwidth network has been upgraded and is designed to supply eight lane interfaces. Now, this optical transceiver supports 200Gbps and 400Gbps Ethernet applications, which were not supported by any of the previous transceivers. The eight lanes that it operates are supported by either 25 Gb/s NRZ modulation or 50Gb/s PAM4 modulation. Having these transceivers in use will increase the bandwidth and the density of every panel by several times. So, as this provides increased speed and also supports more channels, these are highly compatible to be applied in the high-performance computing data centre and also for the cloud networks.
QSFP-DD: The Advantages Are As Follows:
The designed system of QSFP-DD is backward compatible. This means the QSFP-DD is compatible with the QSFP modules (such as QSFP+, QSFP28, QSFP56, etc.) The backward compatibility is very critical and advantageous for the end-users and also for the system designers, as it provides flexibility.
The QSFP-DD is a 2×1 stacked integrated cage. As the industry needs are growing, most of the pluggable form factors seem to have developed a two-high stacked cage-connector system in extension to a one-high cage connector system.
QSFP-DD has the SMT connector and 1xN cage design. With this design, the thermal support of at least 12W per module can be enabled. With the innovative thermal management systems used in the module and cage designs, the QSFP-DD supports power levels of at least 12W per module. Also, as there is a higher thermal level, the heat dissipation capabilities will get reduced, and also unnecessary costs will be cut down.
In a single switch slot, QSFP-DD can enable up to 14.4Tb/s aggregate bandwidth. While maintaining the port density, and by quadrupling aggregate switch bandwidth, QSFP-DD can be made to support continuing growth in data centre traffic and network bandwidth demand.
The ASIC design supports the multiple interface rates, and as it is fully backward compatible with QSFP+ and QSFP28 modules, therefore it reduces the costs of port and equipment deployment.
How Is QSFP-DD Different From QSFP+/QSFP28 & QSFP56
Though QSFP-DD, QSFP+, QSFP28, and QSFP56 are the form factor of QSFP itself, the QSFP-DD is distinct from all three. So, let’s see how QSFP-DD is different from all the three, and how these three are different from each other too, on the basis of the following descriptions:
Structure & Number Of Electrical Interface Lanes:
The physical structure of the QSFP-DD is more or less similar to the QSFP+, QSFP28, and QSFP56. However, as these are physically the same in size, length, width, and thickness, the QSFP-DD provides an 8-lane electrical interface, instead of providing the 4-lane interface, which the other form factors of QSFP tend to provide. Moreover, the QSFP-DD has ASIC ports that are doubled, which is made to support the existing CAUI-4 interface.
Bandwidth
The QSFP-DD has been brought into the market, only because there was a need for higher bandwidth. So, compared to the other QSFP modules, the QSFP-DD supports 400Gbps while QSFP+/QSFP28/QSFP56 can respectively reach 40Gbps/100Gbps/200Gbps. Also, if we see the single-channel rate of QSFP-DD, it is 25Gbps NRZ modulation for eight lanes and 50Gbps PAM4 modulation for four lanes, while QSFP56, QSFP28, and QSFP+ have the 50Gbps, 25Gbps, and 10Gbps.
Application
The application of the QSFP-DD is done at the high-performance computing data centre and the cloud networking centres or at the places that have to set-up their networking and require only the best performance of the network. Also, the other form factors that are QSFP56, QSFP28, and QSFP+ are used at the data centres, or at the places where they suit the best according to their performances.
Modulation Technology
If we talk about the modulation scheme of all the form factors, then the QSFP+, QSFP28, and QSFP56, each have one type of modulation that is NRZ, MRZ, and PAM4 respectively. But if we talk about the modulation of QSFP-DD, it’s a combination. If you want to draw four lanes, the modulation for eight lanes will be 25Gbps NRZ, and for four lanes it will be 50Gbps PAM4.
Backward Compatibility
The backward compatibility is very crucial and important for any newer version of any form factor that is coming into the market. Having the system supporting the Backward Compatibility will eliminate the need to start over and deploy new equipment while upgrading to the newer product. So, from reducing the costs to making the deployment of the latest system easy, backward compatibility does its work, well.
QSFP-DD And OSFP/CFP8/COBO
Now, after talking about the form factors of QSFP, we also need to talk about the form factors of the 400G optics, which are there in the market. So, the form factors that are available in the market of 400G optics are OSFP, CFP8, and COBO.
QSFP-DD and OSFP
The OSFP is another new pluggable form factor of 400G optics. The OSFP and QSFP-DD both form factors that run eight high-speed electrical lanes, support the 400Gb/s, which can reach upto 800Gb/s as well. Though these both form factors appear to be similar but have three key differences too. The differences are:
OSFP allows more power of 15W than the QSFP-DD, which allows 12W. However, the OSFP allows an early adoption, as it is easier to release a technology designed for 15W than 12W, so the consumption of power is more in the OSFP than that of the QSFP-DD. If more power consumption is allowed, the more unnecessary cost will rise, so, QSFP will cost more than QSFP-DD.
The QSFP-DD with the QSFP+ (40G), QSFP28 (100G), and QSFP56 (200G) is backward compliant. At the same time, OSFP requires the QSFP to OSFP converter.
While the OSFP integrates thermal management directly into the form factor, the QSFP-DD does not do the same.
QSFP-DD and CFP8
According to CFP MSA, there are radical differences in the CFP8 and QSFP-DD.
CFP8 has 16x channels 25G NRZ on the electrical side, instead of 8x 50G PAM4 which QSFP-DD has.
The power consumption CFP8 uses is 24W, which is much higher than the QSFP-DD, which is 12W, since CFP8 is three times larger than that of the QSFP-DD. The more the power consumption will be there, the more unnecessary cost will be increased.
The CFP8 can’t be used on the QSFP+ and QSFP28 port, while QSFP-DD can be used on the same.
Though CFP8 and QSFP-DD both have the maximum bandwidth of 400Gb/s, the CFP8 can only support in the form of 16x25G or 8x50G, while QSFP-DD supports both and also 200 Gb/s that is 8x25G.
QSFP-DD and COBO
COBO that is Consortium for On-Board Optics is a non-profit, member-driven, and mutual-benefit corporation that brings together industry leaders to defeat the limitations that are linked with the moving optics inside networking equipment by producing innovative industry specifications.
So, the COBO is installed in the controlled environment, internally to the line-card. The COBO lacks flexibility and also does not support hot-pluggable, so to maintain COBO, it takes more effort than that to maintain the QSFP-DD. The form factor, COBO, has two electrical interfaces, the eight-lane, and sixteen lanes, to meet the 1x400G and 2x400G transmission needs.
Endnote
However, now, as we have compared all the form factors of QSFP and also of the 400G optics, we can clearly see what the differences between all of them are. However, as the QSFP-DD are more compatible in comparison to other form factors of the QSFP; and QSFP-DD and OSFP are better than the other form factors of 400G optics, these are more popular ones in the market too. Also, as the QSFP-DD is the latest form factor and will be soon be brought into use widely, it will be a forerunner in the good development prospect as well. Alongside, when the total bandwidth of 400Gb/s will be applied extensively, it will also lay down the groundwork of the 800G, as the industry leaders have formed the QSFP-DD800MSA group to extend the bandwidth of the QSFP-DD factor from 400Gb/s to 800Gb/s.
Qsfp28 Vs Qsfp-Dd | Qsfp+ Vs. Qsfp28 Transceivers: The Breakdown 45 개의 베스트 답변
당신은 주제를 찾고 있습니까 “qsfp28 vs qsfp-dd – QSFP+ vs. QSFP28 Transceivers: The Breakdown“? 다음 카테고리의 웹사이트 ppa.covadoc.vn 에서 귀하의 모든 질문에 답변해 드립니다: https://ppa.covadoc.vn/blog/. 바로 아래에서 답을 찾을 수 있습니다. 작성자 AddOn Networks 이(가) 작성한 기사에는 조회수 5,216회 및 좋아요 71개 개의 좋아요가 있습니다.
qsfp28 vs qsfp-dd 주제에 대한 동영상 보기
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d여기에서 QSFP+ vs. QSFP28 Transceivers: The Breakdown – qsfp28 vs qsfp-dd 주제에 대한 세부정보를 참조하세요
We’ve compared SFP and QSFP transceivers on this channel before, but in this video, we’re breaking down QSFP+ and QSFP28 transceivers. As quad small form factor pluggables, QSFP+ and QSFP28 both have the ability to use 4 channels of data, however, what are their main capabilities and what are the differences between them? Find out in this video.
Learn more: https://www.addonnetworks.com/solutions/insights/qsfp-vs-qsfp28-transceivers-the-breakdown
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Differences Between QSFP-DD and QSFP+/QSFP28/QSFP56 …
Bandwth & Application … The QSFP-DD modules can support 400Gbps while QSFP+/QSFP28/QSFP56 can only reach 40Gbps/100Gbps/200Gbps respectively.
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Source: community.fs.com
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QSFP-DD vs QSFP28 – Differences? – EDGE Optical Solutions ©
QSFP-DD has the maximum data rate 200Gbps or 400Gbps depending on signal modulation technology used. Its main difference when compared to QSFP56 …
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Source: edgeoptic.com
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Difference between QSFP56 vs QSFP28 vs QSFP
The 200G QSFP56 optical module and the 200G QSFP-DD optical module are two mainstream solutions for 200G optical interconnects.
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Source: www.guanglian-tech.com
Date Published: 2/1/2022
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Differences Between QSFP-DD and QSFP28/OSFP/QSFP56 …
The QSFP-DD modules can handle 400Gbps, while the QSFP+, QSFP28, and QSFP56 modules can only support 40Gbps, 100Gbps, and 200Gbps, respectively.
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Source: www.cbo-it.de
Date Published: 4/6/2022
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The Big Differences Between SFP, SFP+, SFP28, QSFP+ …
QSFP+ vs. QSFP28 vs. QSFP-DD vs. OSFP, What is the …
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Source: www.optcore.net
Date Published: 8/21/2021
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Phân biệt, so sánh các bộ thu phát quang (module quang …
để truyền dữ liệu. Vì vậy sự khác biệt giữa SFP vs SFP +, SFP28 vs SFP +, QSFP vs QSFP28 là gì? QSFP28 có tương thích với QSFP+ không? Chúng ta có thể sử dụng …
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Source: vnexperts.vn
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Know Distinctions Between QSFP-DD & QSFP+/QSFP28 …
The QSFP-DD has been brought into the market, only because there was a need for higher bandwth. So, compared to the other QSFP modules, the …
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Source: www.gbic-shop.de
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QSFP56 vs QSFP-DD – Vitex, LLC
QSFP56 vs QSFP-DD: Comparative Advantages and Disadvantages · QSFP56 was designed to support 200G applications and cannot accommodate an upgrade …
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Date Published: 12/6/2022
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An Overview on QSFP-DD (Double Density QSFP) – Medium
3. QSFP-DD vs. QSFP28 … QSFP28, with increased data rates ranging up to 28 Gbps on each of four lanes, supports next-generation 100 Gbps Ethernet and 100 Gbps …
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Source: medium.com
Date Published: 9/22/2021
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주제와 관련된 이미지 qsfp28 vs qsfp-dd
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QSFP+ vs. QSFP28 Transceivers: The Breakdown
주제에 대한 기사 평가 qsfp28 vs qsfp-dd
Author: AddOn Networks
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Date Published: 2021. 5. 18.
Video Url link: https://www.youtube.com/watch?v=71EjCWCmZ14
Differences Between QSFP-DD and QSFP+/QSFP28/QSFP56/OSFP/CFP8/COBO
QSFP-DD, as the smallest form factor for 400G transceivers, offers industry’s highest bandwidth density while leveraging the backward compatibility to lower-speed QSFP pluggable modules and cables, making it popular among the fiber optic manufacturers. As the newest hot type of optical transceivers in 400G high-speed applications, QSFP-DD is often compared with other modules such as QSFP56, OSFP, CFP8, and COBO. So what are the differences among these optical modules? This post will illustrate them thoroughly. QSFP-DD Wiki QSFP-DD (also called QSFP56-DD) stands for Quad Small Form Factor Pluggable Double Density, which is fully compliant with IEEE802.3bs and QSFP-DD MSA standards. The “double density” means the doubling of the number of high-speed electrical interfaces that the module supports compared with a standard QSFP28 module. The data rate of each channel can reach 25Gb/s through NRZ modulation technology, realizing 200G network transmission. Also, the data rate of each channel can reach 50Gb/s by the PAM4 modulation technology, achieving 400G network transmission, which is suitable for high-performance computing data center and cloud network. For more information about PAM4 modulation technology, please visit: PAM4: Learn 400G Ethernet From Here. The advantages of QSFP-DD form factor are as follows: Backward compatibility: allowing the QSFP-DD to support existing QSFP modules (such as QSFP+, QSFP28, QSFP56, etc.) and provide flexibility for end-users and system designers. Adopting the 2×1 stacked integrated cage/connector to support the one-high cage connector and two-high stack cage connector system. SMT connector and 1xN cage design: this kind of design can enable thermal support of at least 12W per module. The higher thermal reduces the requirement for heat dissipation capabilities of transceivers, thus reducing some unnecessary costs. ASIC design: supporting multiple interface rates and fully backward compatible with QSFP+ and QSFP28 modules, thus reducing port and equipment deployment costs. QSFP-DD vs QSFP+/QSFP28/QSFP56 QSFP-DD, QSFP+, QSFP28 and QSFP56 belong to the QSFP form factor, but what are the differences among them? The differences are explained in the following descriptions. Structure In terms of the appearance, the width, length and thickness of the QSFP-DD are the same as QSFP+, QSFP28 and QSFP56. But the QSFP-DD module is equipped with an 8-lane electrical interface rather than a 4-lane like other QSFP modules and the ASIC ports of QSFP-DD are doubled to support existing interfaces such as CAUI-4. Therefore, the mechanical interface of QSFP-DD on the host board is slightly deeper than that of the other QSFP system transceivers to accommodate the extra row of contacts. Bandwidth & Application The QSFP-DD modules can support 400Gbps while QSFP+/QSFP28/QSFP56 can only reach 40Gbps/100Gbps/200Gbps respectively. Therefore, QSFP-DD connectors are used in 400G optical modules, DACs and AOCs, and applied for the 400G data center interconnections. And QSFP+/QSFP28/QSFP56 modules and DAC/AOC are used for 40G/100G/200G networks. interconnection. Backward Compatibility As mentioned above, the QSFP-DD can be backward compatible with the previous QSFP system transceiver modules. In other words, based on the previous form factor, the QSFP-DD has been technically upgraded to support increased bandwidth. And its backward compatibility can avoid existing equipment replacement on the scale and effectively reduce the network upgrade cost. Form Factor QSFP-DD QSFP56 QSFP28 QSFP+ Released Year 2016 2018 2016 2010 Number of Electrical Interface Lanes 8 4 4 4 Single Channel Rate 25Gbps/50Gbps 50Gbps 25Gbps 10Gbps Modulation Technology NRZ/PAM4 PAM4 NRZ NRZ Backward Compatibility QSFP+/QSFP28/QSFP56 QSFP+/QSFP28 QSFP+ / QSFP-DD vs OSFP/CFP8/COBO QSFP-DD (QSFP56-DD) and OSFP/CFP8/COBO are the form factors of 400G optics on the market, the differences of them are listed below: QSFP-DD vs OSFP OSFP is a new pluggable form factor with eight high speed electrical lanes that will initially support 400Gb/s (8x50G) or reach up to 800Gb/s. The width, length and thickness of QSFP-DD are 18.35mm, 89.4mm and 8.5mm, while those of OSFP are 22.58mm, 107.8mm and 13.0mm. It is obvious that the OSFP form factor is slightly wider and deeper than the QSFP-DD, but it still supports 36 OSFP ports per 1U front panel, enabling 14.4Tb/s per 1U. Generally, the power consumption of QSFP-DD is 7-12W, while the OSFP can reach 12-15W. The lower the power consumption, the better the performance of the transceiver. Unlike the QSFP-DD, OSFP can’t be backward compatible with QSFP+/QSFP28 since it has a larger size than that of QSFP+/QSFP28. QSFP-DD vs CFP8 Featuring a 41.5mm*107.5mm*9.5mm form factor, the CFP8 module delivers four times more bandwidth than existing 100G solutions. Its electrical interface has been generally specified to allow for 16×25 Gb/s and 8×50 Gb/s mode. Since the size of CFP8 is almost three times larger than that of QSFP-DD, the power consumption of CFP8 is much higher than QSFP-DD. Meanwhile, the CFP8 can’t be used on QSFP+/QSFP28 ports. The maximum bandwidth of CFP8 and QSFP-DD is 400Gb/s, but CFP8 only supports in the form of 16x25G or 8x50G while QSFP-DD also supports both 200Gb/s (8x25G). QSFP-DD vs COBO COBO stands for Consortium for On-Board Optics, it can be installed internally to the line-card equipment in a controlled environment, which lacks flexibility. And it doesn’t support hot-pluggable, so it is more difficult for COBO modules to maintain than QSFP-DD. Additionally, the COBO form factor has two electrical interfaces——one eight lane and the other sixteen lane to meet both 1x400G and 2x400G transmission requirements. The following chart shows the market maturity of the QSFP-DD, OSFP, CFP8 and COBO form factors. The larger the numbers, the higher the market maturity of these form factors. Performance CFP8 OSFP QSFP-DD COBO Volume 1 2 3 4 Power Consumption 3 2 1 4 Cost 1 3 4 2 Maturity 4 3 2 1 Compatibility 3 2 4 1 Difficulty for Operation & Maintenance 2 3 4 1 Overall Ratings 14 15 18 13 We can see from the table that the overall rating of QSFP-DD and OSFP form factors are higher than other form factors. So the QSFP-DD and OSFP are more popular with fiber optic manufacturers. While the former is suitable for data center applications and the latter often applied for telecommunications applications. For more types of 400G transceivers, please refer to How Many 400G Transceiver Types Are in the Market? for more detailed information. Will QSFP-DD Be Popular in 800G Ethernet? The QSFP-DD (QSFP56-DD) is more suitable for data center applications than OSFP. With the concentration of east-west traffic in the data center and the increasing pressure on the internal bandwidth of the data center, the time gap between the application of high-speed optical modules in the telecom market and the data center market is gradually shortening. The 400G optics will be applied widely. That is, QSFP-DD will benefit from the 400G Ethernet and ushered in a good development prospect. As 400G becomes commercially available on a large scale, single-wave 100G technology is set to mature, laying the groundwork for the arrival of 800G. Recently, the QSFP-DD800 Multi-Source Agreement (MSA) organization released the first version of the QSFP-DD800 transceiver hardware specification, which is dedicated to the continuation of the current QSFP-DD form factor to support a single channel rate of 100Gbps 8-channel new generation QSFP-DD800. This also means that 800G might still adopt the QSFP-DD form factor to bring greater advantages and values for Internet service providers.
Comparing 200G/400G capable form factors (QSFP-DD vs. QSFP+/QSFP28/OSFP/CFP9/COBO)
Achieving 400G network speeds requires utilizing the industry’s highest performing fiber optics. From top-of-the-line bandwidth density to the flexibility of backwards compatibility, the quad small form pluggable double density (QSFP-DD) is one of the most popular choices for cutting edge fiber network design. But what makes this form factor such a standout above the others? Why choose QSFP-DD over other form factors like QSFP56, OSFP, CFP8, or even COBO? Read on to learn more. Defining the QSFP-DD form factor The QSFP-DD is IEEE802.3bs and MSA standard compliant, however, it doubles the number of interfaces that the standard QSFP28 form supports. When using standard NRZ modulation, each interface can support 25GB/s for a total of 200G throughput (8x25G). If additional lane density is needed, higher level PAM4 modulation technologies can be leveraged to deliver a 400G (8x50G) signal. The flexibility of this form factor not only offers a path to 200G but also creates a cost-effective path to scale to 400G in the future. The savvy data center, enterprise network, or service provider network operator can easily leverage either modulation scheme for reducing per port hardware costs for high-performance computing or cloud-based processing applications. How does QSFP-DD differ from its predecessors (QSFP+, QSFP28, QSFP56)? There are many functional and physical differences, but let’s begin with its structure and composition. Although the footprint of the physical transceiver is the same, its electrical interface is quite different. Since this is a double density module, it carries 8 lanes instead of 4. In turn, this increases the amount of ASIC ports to support CAUI-4 and other existing interfaces. While QSFP+, QSFP28, and QSFP56 can achieve 40G, 100G, and 200G data rates, the lower lane count means that even with PAM4 modulation 400G data rates are not possible. For applications involving 400G data center interconnects, leveraging QSFP-DD transceivers, direct attach cables (DACs), and active optical cables (AOCs) creates a high-performance link capable of scaling to next generation data rates. A key tenant of the scalability of QSFP-DD transceivers is that they are also backwards compatible with its predecessors. Already deployed QSFP+ transceivers can remain in use without compromising performance of the network beyond the QSFP-DD. This keeps upgrade costs in check by compartmentalizing and deferring replacement of QSFP to QSFP-DD modules to a later time. Form Factor QSFP-DD QSFP56 QSFP28 QSFP+ Backward Compatibility QSFP+, QSFP28, QSFP56 QSFP+, QSFP28 QSFP+ N/A Per Channel Data Rate 25G/50G 50G 25G 10G Modulation Type Supported NRZ & PAM4 PAM4 NRZ NRZ Lane Count 8 4 4 4 Why QSFP-DD over other 400G capable form factors (OSFP, CFP8, & COBO)? When compared to the octal small form pluggable (OSFP), the QSFP-DD is quite similar. Both utilize eight lanes to achieve 400G data rates (8x50G), however, the OSFP is planned to later support 800G signals. The QSFP-DD is a better option for those needing the interim step to 200G not only for cost, but also due to reduced power consumption. OSFP tends to be a better choice for operators immediately moving to 400G with desire for later scalability, however, OSFP is not backwards compatible with QSFP+ and its other forms. This means a move to 400G will come at a higher immediate cost with OSFP with savings later realized by deferring further cost at the 800G upgrade. Relative form factor footprints (courtesy of Ethernet Alliance) CFP8 is another popular form factor for 400G applications due to its support for both 16x25G and 8x50G, however, it has a much larger physical footprint as well as in elevated power consumption levels. Unfortunately it is neither backwards compatible nor scalable to 800G. Our final current option is the unique consortium for on-board optics (COBO). Though newer, this type is installed in the line-card. This installation method puts many features of the QSFP-DD out of reach for a COBO, such as lacking the flexibility provided by a hot-pluggable optic. Through an 8 lane 1x400G or a 16 lane 2x400G connector interface, however, it can support both 400G and 800G. Is QSFP-DD preferred for 400G deployments? Yes, but it also depends on the application. If you don’t need the 200G interim step, there may be deferred operational and capital expense savings by moving straight to 400G. However, if budget or downtime is a concern, the interim step may allow for deferred initial expenses and long term operational savings. The market is moving towards adopting QSFP-DD as a form factor for 800G, with the first Multi-Source Agreement (MSA) specifications for a QSFP-DD800 form factor already released. While the future may hold other technological advancements in the 800G race, it appears the QSFP-DD form factor is here to stay. Make the connection your network needs. Contact us now for your next 200G/400G upgrade.
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QSFP-DD vs QSFP28/QSFP56 – What Are The Differences? Intro QSFP-DD vs QSFP28 / QSFP56 how we got here with so many different QSFP’s ? The rapid growth of cloud data center networking and interconnections are pushing the technology development to meet the ever higher bandwidth connectivity demands. From the rise of 40G-QSFP transceivers and ever successful advancement to the 100G-QSFP28 form-factor, the next major step is prevalence of 200G and 400G Ethernet technology with QSFP-DD form-factor optical transceivers. Current widespread use of 100G QSFP28 technology transceiver form-factor, followed by 200G QSFP56 transceiver form-factor, have led to a completely new optical transceiver form-factor QSFP-DD. Confused? Yep, it is a bit, this article will help to quickly understand the main differences between QSFP-DD, QSFP56 and QSFP28. 1. QSFP-DD vs QSFP28 / QSFP56 Quick Overview Form Factor QSFP-DD QSFP56 QSFP28 Data Rate 400G/200G 200G 100G Lane count 8 electrical 4 electrical 4 electrical Lane data rate 25 / 50 Gbps 50 Gbps 25 Gbps Modulation type NRZ / PAM4 PAM4 NRZ Power consumption 12 W 4 – 7.5 W < 3.5 W Connector types CS / LC LC / MPO / CS LC / MPO Dimensions 18.35 / 89.4 / 8.5mm 18.35 / 72.3 / 8.5mm 18.35 / 72.3 / 8.5mm 2. QSFP-DD vs QSFP28 / QSFP56 Difference 1 – Data Rate The first basic parameter which describes optical transceivers is data rate. Data rate is defined as the amount of data transmitted during a specified time period over a network. Different transceivers and respective networking technologies have different data rate values. QSFP-DD has the maximum data rate 200Gbps or 400Gbps depending on signal modulation technology used. Its main difference when compared to QSFP56 or QSFP28 is that QSFP-DD name states – double density, this means that its electrical lines are doubled from 4 to 8. 8 channels modulated with NRZ results of 25Gbps per channel, which totals to 200Gbps . . But 8 channels modulated with PAM4 results in 50Gbps per channel, which totals to 400Gbps. (Respectively, QSFP56 maximum data rate is 200Gbps, but QSFP28 is 100Gbps). Comparison of data rates basing on networking technologies: Ethernet technology standartizes following data rates for QSFP-DD – 212.5 Gbps, 425 Gbps. InfiniBand is an industry standard, channel-based, switched fabric interconnect architecture for server and storage connectivity. InfiniBand standartizes following data rates for QSFP28: 100G EDR, for QSFP-DD: 200G HDR, 400G NDR. The optical transport network (OTN) make up a generic Layer-1 transport network, enabling different service types to coexist and share the same infrastructure transparently, without affecting each other’s performance.OTN Optical Transport Network, specifies OTU4 for QSFP28 100G, OTUc2 for 200G, OTUc4 for 400G applications, QSFP-DD respectively. Fiber Channel: 128GFC (24850 56.1 PAM-4) released in 2021, with more higher data rate generations to be released in future – 256GFC at 2024. Summary: QSFP-DD QSFP56 QSFP28 Ethernet 212.5Gbps, 425Gbps 212.5Gbps 106.25Gbps InfiniBand 400G NDR, 200G HDR 200G HDR 100G EDR OTN OTUc4, OTUc2 OTUc2 OTU4 Fiber Channel – – 128GFC 3. QSFP-DD vs QSFP28 / QSFP56 Difference 2 – Modulation Type Next notable difference factor is transceiver modulation. Optical transceiver consists of a laser which is able to emit light, and a modulator. Optical modulator is a device which can be used for manipulating a property of light. It determines the quality of transmissions between transmission equipment. Regarding pluggable optical transceivers, it is the intensity of the light that is modulated. Engineers have long utilized non-return to zero (NRZ) modulation for 1G, 10G and 25G, using host side forward error correction (FEC) to enable longer distance transmissions. For higher data rate 40G and 100G industry introduced signal parallelization of 10G and 25G NRZ modulated signals. In short lower speed optics 1G, 10G, 25G and most 100G optics, modulates the intensity of the light at NRZ two levels, and is therefore binary. Downside for NRZ modulation technology for 200G, 400G and other faster data rates is not efficient as compared to smaller data rates. As a result, network scientists have developed PAM4 modulation for these high bandwidth data rates. Different modulation technologies: NRZ – Non-Return-to-Zero, is a 2 level binary code using low and high signal levels to represent the 1/0 information of a digital logic signal. NRZ can only transmit 1 bit, i.e. a 0 or 1, of information per signal symbol period. PAM4 – Pulse Amplitude Modulation 4 is a 4 level signal modulation format used to transmit signals. Each signal level can represent 2 bits of logic information. This means that with PAM4 modulation information can be transmitted in two times shorter time. Or two times more information at the same time. Practically we can see this with a 400G transceiver. This transceiver has a built in DSP gearbox which takes 8x 25GBaud PAM4 signal and converts it to 4x 50GBaud PAM4 signal. And so that it is with PAM4 modulation 4x 50GBaud scales to 4x 100Gbps lines, which then are multiplexed and fully gives 400Gbps data rate. Picture – PAM4 four distinct levels to encode 2 bits of data: Summary: Transceiver type Modulation 100G QSFP28 NRZ 200G QSFP56 NRZ / PAM4 400G QSFP-DD PAM4 4. QSFP-DD vs QSFP28 / QSFP56 Difference 3 – Power Consumption Optical transceiver power consumption is closely related to host device total power budget. The bigger the transceivers power consumption, the smaller count of transceivers usable in host equipment. So the smaller power consumption of transceiver and host equipment altogether – the better performance and smaller environment impact. QSFP-DD transceiver specification allows maximum power consumption of 12 Watts. QSFP56 transceiver specification allows maximum power consumption of <5 Watts. QSFP28 transceiver specification allows maximum power consumption of <3.5 Watts. General rule of thumb, the smaller the power consumption the smaller the module temperature, better transceiver reliability and better overall performance of transceiver. Summary: Transceiver type Power consumption 100G QSFP28 <3.5 Watts 200G QSFP56 <5 Watts 400G QSFP-DD <12 Watts 5. QSFP-DD vs QSFP28 / QSFP56 Difference 4 – Connector Types Optical transceivers have two ends. One end is the electrical connector which connects to the host equipment (switch, router etc..) other end is laser output which connects to optical fiber. QSFP28, QSFP56 transceivers have a 38pin electrical interface which connects to the host device. But QSFP-DD as it is double density, has a double count of electrical pins – 76. This basically means that systems (host devices) which are designed with QSFP-DD port are backward compatible with QSFP56 and QSFP28 form factor transceivers. Practically this means that if you have an router with QSFP-DD ports, you can easily plug QSFP56 or QSFP28 in those same ports (before connecting check product data sheet if port logically supports QSFP56 or QSFP28 transceiver). Following picture shows us QSFP28 pads and additional pads which are used for QSFP-DD, to accommodate the double line interface. Optical transceivers on their respective ends have an optical connector compatible plug mechanism of female type. This connector can have the following type: LC, MPO or CS. Regarding the MPO cables we at EDGE Optics have separate article which can be red here. CS connector is the newest generation technology for connecting 200G and 400G optical interfaces. The CS connector consists of a Double LC type push-pull coupling mechanism which is by 40% smaller than our well known Duplex LC connector. The smaller footprint doubles up the connector density on the switch front panel if compared to LC connector. One QSFP-DD transceiver takes two CS connectors, one pair for transmission and one pair for receiving signals. Dual CS connector profile: CS connector: Transceiver type Connector 100G QSFP28 LC / MPO 200G QSFP56 LC / MPO / CS 400G QSFP-DD LC / CS 6. Difference 5 – Dimensions QSFP-DD is the latest developed and with highest data rate transceiver, it has some dimension differences if compared with QSFP56 and QSFP28 form factor transceivers. QSFP-DD is a slightly longer transceiver because of four extra electrical lines – which makes it a double density transceiver (the electrical interface contains a larger count of electrical pads – 76). QSFP-DD 18.35 / 89.4 / 8.5mm QSFP56 18.35 / 72.3 / 8.5mm QSFP28 18.35 / 72.3 / 8.5mm 7. More on QSFP-DD Form Factor and Module Types Type Fiber type Wavelength Number of lines Reach Optical modulation Optical connector 400GBASE-SR8 QSFP-DD MMF Tx/Rx 850/850nm 8x53Gbps 100m (OM4) PAM4 MTP/MPO 400GBASE-DR4 QSFP-DD SMF Tx/Rx 4×1310 PSM4 4×106.25 Gbps 500m (OS2) PAM4 MTP/MPO 400GBASE-DR4+ QSFP-DD SMF Tx/Rx 4×1310 PSM4 4×106.25 Gbps 2km (OS2) PAM4 MTP/MPO 400GBASE-FR4 QSFP-DD SMF Tx/Rx 4 CWDM lanes:1271, 1291, 1311, 1331. 4×106.25 Gbps 2km (OS2) PAM4 LC 400GBASE-LR4 QSFP-DD SMF Tx/Rx 4 CWDM lanes:1271, 1291, 1311, 1331 4×106.25 Gbps 10km (OS2) PAM4 LC 400GBASE-ER4 Lite QSFP-DD SMF Tx/Rx LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4×106.25 Gbps 40km (OS2) PAM4 LC 400GBASE-LR8 QSFP-DD SMF Tx/Rx 8 LWDM lanes:1273, 1277, 1282, 1286, 1295, 1300, 1304, 1309 8x53Gbps 10km (OS2) PAM4 LC 400GBASE-ER8 QSFP-DD SMF Tx/Rx 8 LWDM lanes:1273, 1277, 1282, 1286, 1295, 1300, 1304, 1309 8x53Gbps 40km (OS2) PAM4 LC 200GBASE-LR4 QSFP-DD SMF Tx/Rx LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x53Gbps 10km (OS2) PAM4 LC 200GBASE-ER4 QSFP-DD SMF Tx/Rx LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x53Gbps 40km (OS2) PAM4 LC 8. More on QSFP56 Form Factor and Module Types Type Fiber type Wavelength Number of lines Reach Optical modulation Optical connector 200GBASE-SR4 QSFP56 MMF Tx/Rx 850/850nm 4x53Gbps 100m (OM4) PAM4 MTP/MPO 200GBASE-DR4 QSFP56 SMF Tx/Rx 1310/1310nm 4x53Gbps 500m (OS2) PAM4 MTP/MPO 200GBASE-FR4 QSFP56 SMF Tx/Rx 4 CWDM lanes: 1271, 1291, 1311, 1331. 4x53Gbps 2km (OS2) PAM4 LC 200GBASE-LR4 QSFP56 SMF Tx/Rx LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x53Gbps 10/20km (OS2) with FEC PAM4 LC 200GBASE-ER4 QSFP56 SMF Tx/Rx LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x53Gbps 40km (OS2) PAM4 LC 9. More on QSFP28 Form Factor and Module Types Type Fiber type Wavelength Number of lines Reach Optical modulation Optical connector 100GBASE-SR4 QSFP28 MMF Tx/Rx 850/850nm 4x25Gbps 100m (OM4) NRZ MTP/MPO 100GBASE-DR4 QSFP28 SMF Tx/Rx 4 CWDM lanes: 1271, 1291, 1311,1331 4x25Gbps 500m (OS2) NRZ LC 100GBASE-PSM4 IR4 QSFP28 SMF Tx/Rx 1310/1310nm 4x25Gbps 2km (OS2) NRZ MTP/MPO 100GBASE-CWDM4 QSFP28 SMF Tx/Rx 4 CWDM lanes: 1271, 1291, 1311,1331 4x25Gbps 2km (OS2) NRZ LC 100GBASE-LR4 QSFP28 SMF Tx/Rx 4 LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x25Gbps 10km (OS2) NRZ LC 100G 4WDM-10 QSFP28 SMF Tx/Rx 4 CWDM lanes: 1271, 1291, 1311,1331 4x25Gbps 10km (OS2) NRZ LC 100GBASE-ER4 Lite QSFP28 SMF Tx/Rx 4 LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x25Gbps 40km with host FEC (OS2) NRZ LC 100GBASE-ZR4 QSFP28 SMF Tx/Rx 4 LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x25Gbps 80km with host FEC (OS2) NRZ LC 100G-DR Single Lambda PAM4 QSFP28 SMF Tx/Rx: 1304.5-1317.5nm 1x100Gbps 500m (OS2) PAM4 LC 100G-FR Single Lambda PAM4 QSFP28 SMF Tx/Rx: 1304.5-1317.5nm 1x100Gbps 2km (OS2) PAM4 LC 100G-LR Single Lambda PAM4 QSFP28 SMF Tx/Rx: 1304.5-1317.5nm 1x100Gbps 10km (OS2) PAM4 LC 100GBASE-LR4 RX Only QSFP28 SMF Rx only: 4 LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x25Gbps 10km (OS2) NRZ LC 100GBASE-ER4 Lite RX Only QSFP28 SMF Rx only: 4 LAN WDM lines: 1295.56, 1300.05, 1304.58, 1309.14 4x25Gbps 40km (OS2) NRZ LC 10. Conclusion QSFP-DD, QSFP56 and QSFP28 transceivers differ in many ways. The most significant difference for the newest QSFP-DD transceivers is that this double density form factor packs a double 4 lane electrical interface which totals to 8 electrical lanes. This allows it to support data rates up to 400Gbps. The 8 lane technology packed in QSFP-DD increases its dimensions in length up to 89.4mm, (if compared to QSFP56 and QSFP28 72.3mm). Additionally QSFP-DD has a double count of electrical pad connector lines (76) to accommodate the 8 lane interface. QSFP-DD unlocks its abilities to achieve 400Gbps data rate with great help of PAM4 modulation. This modulation technique is new for optical transceivers, because previously the 2 level NRZ modulation technique was used in last generation 100G-QSFP28 transceivers. Instead PAM4 modulation is 4 level amplitude modulation where each level can represent 2 bits of information. As a result with PAM4 modulation information can be transmitted in two times shorter time – or respectively two times more information at the same time. With this principle QSFP-DD can achieve higher than ever data rates. As the QSFP-DD packs in itself new technologies, its power consumption has risen to unseen levels. QSFP-DD peak power consumption can be up to 12 Watts. Which by comparison to QSFP28 3.5 Watts is a notable increase. The increased power consumption allows it to achieve the promised 400Gbps data rate. Both QSFP-DD and QSFP56 in the near future will be equipped with the latest technology CS connector. The CS connector consists of a Double LC type push-pull coupling mechanism which is by far smaller than the classical Duplex LC connector. The smaller footprint doubles up the connector density on the switch front panel. As well it enables two 400Gbps QSFP-DD transceiver connectivity with each other or signal break out options to 2x 200Gbps QSFP56 transceivers. QSFP-DD form factor is used for 400Gbps and a few 200Gbps transceivers. The 400G QSFP-DD transceiver types most importantly differ between each other with working distance and wavelengths used. For example 400GBASE-SR8 is the only one version QSFP-DD transceiver which uses Multi-Mode fiber, and can achieve 100 meter distance. Up until the top 400GBASE-ER8 version which is Single-Mode fiber 40km reach version. And many more versions in between. Difference between QSFP56 vs QSFP28 vs QSFP+ Jun. 10, 2022 The 200G QSFP56 optical module and the 200G QSFP-DD optical module are two mainstream solutions for 200G optical interconnects. The QSFP56 utilises mainstream digital signal processors (DSPs) to help cloud data centres meet the tough challenges of achieving more efficient optical interconnects at a flexible and scalable scale and low cost. This article will introduce you to the optical module 200G QSFP56 package technology and the difference between the QSFP56 package and the QSFP28 and QSFP+ packages. Overview of 200G QSFP56 optical module packaging technology The 200G QSFP56 optical module is an upgraded version of the 40G QSFP+ and 100G QSFP28 optical modules and is designed specifically for 200G Ethernet interconnects. modules. Depending on the transmission distance, 200G QSFP56 optical modules are divided into QSFP56 CR, SR, DR, FR and LR, which can be used for different distances on single-mode and multimode fibres. 200G QSFP56 In general, two 200G QSFP56 optical modules can be plugged into the corresponding switch port and connected with a single-mode or multimode fibre to achieve a 200G transmission rate. In addition, 200G transmission can also be achieved by inserting a QSFP56 DAC/AOC high-speed cable into the corresponding port. For 2x100G or 4x50G transmission, 200G QSFP56 to 2x100G QSFP28 branch cables and 200G QSFP56 to 4x50G SFP56 branch cables can be used to achieve this. Difference between QSFP56 vs QSFP28 vs QSFP+ By name, QSFP56, QSFP28 and QSFP+ optical modules have the same package type, but they have different transmission rates, modulation techniques, interfaces, etc. You can find the high-quality optical module, click here. 100GBASE-QSFP28-CWDM4-10km Optical Transceiver Module The QSFP56 package type can support 4x50G transmission to achieve a 200G transmission rate, while the QSFP+ module is an upgraded version of the QSFP module and can support 4x10G transmission for 10G Ethernet, 10G Fibre Channel and QDR InfiniBand. It can multiplex four channels to increase bandwidth and achieve 40Gbps transmission rates (10GBaud NRZ per channel). QSFP28 optical modules, like QSFP+ optical modules, contain 4 optical transmitters and 4 optical receivers to support 4x25G transmission, resulting in 100G transmission rates. The main difference between the QSFP56 package and the QSFP+ and QSFP28 packages is that the QSFP56 no longer adopts the previous NRZ modulation technology, but instead adopts PAM4 modulation technology, which can achieve transmission rates of up to 50G per channel, allowing more data to be transmitted over existing fibre, making it more suitable for applications in hyperscale data centre networks. 40GBASE-QSFP+-PSM LR4-10km Optical Transceiver Module 200G QSFP56 to 400G QSFP-DD With the rapid growth of data centres, the demand for data transmission is also increasing, driving the network towards higher bandwidth and higher density. There is now a new generation of 400G optical module packages on the market – the 400G QSFP-DD, where “DD” refers to dual-density, meaning that the number of channels in the 400G QSFP-DD has changed from four to eight, allowing for 400G transmission rates. This means that the number of channels in the 400G QSFP-DD has been changed from 4 to 8, enabling 400G transmission rates to be achieved. The 400G QSFP-DD optical module is similar in size to the 200G QSFP56 optical module, but the 400G QSFP-DD optical module is backwards compatible with 40G QSFP+, 100G QSFP28, 200G QSFP56 and other QSFP packaged optical modules. This means that 200G QSFP56 optical modules can work on 400G QSFP-DD ports as long as the switch supports them. When using a 200G QSFP56 optical module on a 400G QSFP-DD port, the switch’s port will be configured for a 200G transmission rate instead of 400G. As a leading optical transceiver solution and service provider, Guanglian is dedicated to research, development, manufacturing, and marketing high-speed and high-performance optical transceiver modules and optical components for various ICT applications, such as Data Center, Telecom Networks, and Security Monitoring. Welcome to contact us today or request a quote. Differences Between QSFP-DD and QSFP28/OSFP/QSFP56/QSFP+/COBO/CFP8 The form factors of 400G optics in markets include QSFP-DD or QSFP56-DD and COBO/ OSFP/ CFP8, with the following differences: CFP8 vs QSFP-DD The CFP8 module, which has a physical factor of 41.5mm x 107.5mm x 9.5mm, provides four times the bandwidth of conventional 100G systems. Its electrical interface has been designed to provide 16 x 25 Gb per second and 8 x 50 Gb per second data rates. CFP8’s power consumption is much higher than QSFP-DD because its size is nearly three times that of QSFP-DD. The CFP8 is not compatible with QSFP+/QSFP28 ports. CFP8 and QSFP-DD both have a maximum bandwidth of 400 GB/s, however, CFP8 only supports 8x50G or 16x25G, whereas QSFP-DD supports both 200Gb/s and 400Gb/s (8x25G). OSFP vs QSFP-DD OSFP is a recent pluggable form factor with eight hi-speed electrical pathways that can handle 400Gb/s to 800Gb/s (8x50G). QSFP-DD is 18.35mm wide, 89.4mm long, and 8.5mm thick, whereas OSFP is 22.58mm wide, 107.8mm long, and 13.0mm thick. Although the OSFP form factor is somewhat deeper and wider than the QSFP-DD; still it supports 36 OSFP ports allowing for 14.4Tb/s per 1U. In general, QSFP-DD consumes 7 to 12 watts of power, but the power consumption of the OSFP can reach up to 12 to 15 watts. The leaner the power expenditure the higher the performance of the optical transceiver. Because OSFP has larger dimensions, it cannot be fully compatible with QSFP+/QSFP28, unlike QSFP-DD. COBO vs QSFP-DD For on-board optics, COBO may be fitted in a controlled setting to a line-card kit that lacks flexibility. COBO modules are also more difficult to maintain than QSFP-DD since they do not support hot plugging. In addition, the COBO form factor comes with two electrical interfaces, one contains eight lanes and the other contains sixteen lanes, to support both types of transmission; 1x400G and 2x400G. The following chart exhibits the market maturity of various form factors. In this chart, higher numbers reflect higher market maturity of different form factors. The Big Differences Between SFP, SFP+, SFP28, QSFP+, QSFP28, QSFP-DD, and OSFP Every IT manager is familiar with SFP or SFP+ optics, independent devices linked daily to switch or network devices. Do you also have a working knowledge of SFP28, QSFP+, QSFP28, and QSFP-DD optics? What is the main difference between them? In this post, we’ll go over the key differences between the SFP+, SFP28, QSFP+, QSFP28, and QSFP-DD transceivers and everything you need to know before making a purchase. Pluggable Transceiver Optics are generally broken down into seven broad categories: SFP, SFP+, QSFP+, SFP28, QSFP28, QSFP-DD, and OSFP. These terms refer to the form factor and transmission data rate. Table of Contents: What is an SFP Transceiver? SFP stands for small form-factor pluggable. It is also known as a “mini-GBIC” (gigabit interface converter). An SFP transceiver is a tiny transceiver that links fiber optic cables to various networking devices such as switches, routers, network cards, and wireless access points. Multiple SFP transceivers are available, depending on data rate and application, including 155M SFP, 622M SFP, 1G SFP, 2.5G SFP, 2G/4G Fiber Chanel SFP, 3G SFP, and 6G SFP. They are used in fiber-optic Ethernet networks, particularly common in commercial networks. SFP transceivers are one of the most widely utilized fiber-optic networking equipment nowadays. What is an SFP+ Transceiver? Compared to SFP transceivers, SFP+ transceivers are a more advanced version of the technology. SFP+ transceivers are most typically offered at 8Gbps, 10Gbps, or 16Gbps. They have the exact dimensions of SFPs, making it simple to integrate them into existing infrastructure. SFP+ transceiver is one of the most popular data center cabling applications. Depending on the application, the SFP+ transceiver can be divided into five broad categories: Dual Fiber SFP+, BiDi SFP+, Copper SFP+, CWDM SFP+, and DWDM SFP+. Read more: What is SFP+ Transceiver? What is the SFP28 Transceiver? SFP28 stands for Small Form-Factor Pluggable 28. It is the third generation of SFP connection systems built for 25G throughput following the IEEE 802.3by specification (25GBASE-CR). The SFP28 is an improved version of the SFP+ designed for 25G signal transmission. The SFP28 has the typical form factor as the SFP+, but it offers 25Gbps electrical connections per channel. Compared with SFP+, SFP28 provides a much higher bandwidth capability. Depending on the application, the SFP28 transceiver can be divided into six broad categories: Dual Fiber SFP28, BiDi SFP28, CWDM SFP28, DWDM SFP28, SFP28 DAC, and SFP28 AOC. Read more: Understanding the difference between SFP+ and SFP28 Transceiver What is a QSFP+ Transceiver? QSFP+, often known as QSFP, is an abbreviation for quad (4-channel) small form-factor pluggable. QSFP+ optics is yet another tiny, hot-pluggable transceiver used in data transmission. Compared to SFP+, QSFP+ supports 4x10G or 4x14G SFP+ data rates to enable increased bandwidth capabilities. It provides several data rate options for Ethernet, Fibre Channel, InfiniBand, and SONET/SDH technologies. What is a QSFP28 Transceiver? QSFP28 is an abbreviation for quad small form-factor pluggable 28. The QSFP28 transceiver is intended for use with 100 Gigabit Ethernet, EDR InfiniBand, or 32G Fibre Channel networks. The QSFP28 100G transceiver has four high-speed differential signal channels with data rates ranging from 25 Gbps to 40 Gbps. In the 100G optics market, QSFP28 transceivers are more popular than CFP, CFP2, and CFP4 form factors. What is a QSFP-DD Transceiver? Quad Small Form Factor Pluggable Double Density (QSFP-DD) is also known as QSFP56-DD. The QSFP-DD transceiver is a new optical module comparable to the current QSFP but adds an extra row of contacts for an eight-lane electrical interface. All QSFP-DD-based transceivers from 40G to 200G are backward compatible with QSFP+. In a single rack unit (RU), QSFP-DD can support 36 400GbE ports, with a total bandwidth of nearly 14Tb/s. What is an OSFP Transceiver? The OSFP acronym stands for Octal Small Form-factor Pluggable. The OSFP MSA designed it. Google launched the OSFP MSA group, which Arista Networks heads. OSFP is a revolutionary pluggable form factor that offers eight high-speed electrical channels at 400 Gbps (8x50G or 4x100G). However, it supports 32 OSFP ports per 1U front panel and 14.4 Tbps per 1U swap slot. OSFP optics with improved signal integrity and thermal performance are being developed to suit the next generation of 800G optics. The OSFP may also be used with 100G QSFP optics. SFP vs. SFP+ vs. SFP28 vs. QSFP+ vs. QSFP28 vs. QSFP-DD vs. OSFP, What is the difference? Phân biệt, so sánh các bộ thu phát quang (module quang) SFP vs SFP+ vs SFP28 vs QSFP+ vs QSFP28. SFP, SFP+, SFP28, QSFP+ và QSFP28 là các loại module quang khác nhau. Và tất cả đều có tính năng hot-pluggable (cắm nóng) được sử dụng để kết nối giữa Switch với các thiết bị mạng khác (ví dụ như Server, các bộ chuyển đổi quang điện…) để truyền dữ liệu. Vì vậy sự khác biệt giữa SFP vs SFP +, SFP28 vs SFP +, QSFP vs QSFP28 là gì? QSFP28 có tương thích với QSFP+ không? Chúng ta có thể sử dụng module quang SFP28 trong các cổng SFP+ không? Bài viết này sẽ giúp chúng ta trả lời các câu hỏi đó. Giới thiệu về các loại module quang: Trước khi tìm ra sự khác biệt giữa SFP và SFP+, SFP28 và SFP+, QSFP và QSFP28 ta cần phải biết SFP, SFP +, SFP28, QSFP và QSFP28 là gì. SFP SFP (small form-factor pluggable) có thể được coi là phiên bản nâng cấp của GBIC (Gigabit interface converter). Nó chỉ nhỏ bằng một nửa module Gbic, giúp tăng đáng kể mật độ cổng trên các thiết bị mạng. Tốc độ dữ liệu của SFP dao động từ 100 Mbps đến 4Gbit/s. SFP+ SFP+ (small form-factor pluggable plus) là phiên bản nâng cấp của SFP. Hỗ trợ lên đến 8 Gbit/s trên kênh truyền quang, 10 Gigabit trên Ethernet và mạng truyền tải quang tiêu chuẩn OTU2. SFP+ cũng giới thiệu tính năng gắn trực tiếp để liên kết 2 cổng SFP+ mà không cần thêm module quang, bao gồm DAC (direct attach cable) và AOC (active optical cable), là giải pháp tuyệt vời cho kết nối trực tiếp khoảng cách ngắn giữa 2 thiết bị mạng liền kề. SFP28 SFP28 (small form-factor pluggable 28) là phiên bản nâng của SFP+. SFP28 có cùng hình dáng như SFP+ nhưng hỗ trợ lên đến 25Gb/s. SFP28 cũng cấp thêm phương thức để nâng cấp mạng: 10G – 25G – 40G – 100G, đây là 1 giải pháp tiết kiệm năng lượng để đáp ứng nhu cầu ngày càng tăng của các Data Center thế hệ tiếp theo. QSFP+ QSFP+ là 1 sự phát triển của QSFP (quad small form-factor pluggable). QSFP có thể mang 4 kênh đồng thời và mỗi kênh có thể xử lý tốc độ dữ liệu 1Gbit/s dó đó nó có tên Quad SFP. Không giống như QSFP, QSFP+ hỗ trợ 4 kênh x 10Gbit/s và 4 kênh có thể được kết hợp thành 1 liên kết có tốc độ 40 Gbit/s. Module QSFP+ có thể thay thế cho 4 module SFP+ tiêu chuẩn, dẫn đến mật độ cổng sẽ lớn hơn và tiết kiệm được chi phí cho hệ thống so với các sản phẩm SFP+. QSFP28 QSFP28 (quad small form-factor pluggable 28) được thiết kế cho các ứng dụng tốc độ 100G. Nó cũng cấp bốn kênh tốc độ cao với tốc độ xử lý dữ liệu từ 25Gbps đến khả năng 40Gbps, và cuối cùng đáp ứng 100Gbps (4 x 25Gbps) và các yêu cầu tốc độ dữ liệu cao (EDR) 100Gbps. Lưu ý rằng, QSFP28 có thể thực hiện được các kết nối đột phá 4x 25G và 2 x 50G hoặc 1 x 100G tùy thuộc vào loại module quang được sử dụng. So sánh SFP vs SFP+ vs SFP28 vs QSFP+ vs QSFP28 Sau khi đã tìm hiểu SFP/SFP+/SFP28/QSFP+/QSFP28 là gì, sau đây chúng ta sẽ đưa ra những so sánh chi tiết giữa SFP vs SFP+, SFP28 vs SFP+, QSFP vs QSFP28 and SFP28 vs QSFP28. SFP vs SFP+: Có cùng kích thước nhưng tốc độ và độ tương thích khác nhau. Bộ thu phát SFP và SFP+ đều có kích thước và hình dáng giống nhau. Điều này cho phép nhà sản xuất thiết bị sử dụng lại các thiết kế vật lý của SFP hiện có cho các thiết bị chuyển mạch với cổng SFP+. Về sự khác biệt thì 1 điều rõ rang là chúng hỗ trợ các tốc độ truyền khác nhau, SFP lên tới 4Gbit/s trong khi SFP+ là 10Gbit/s. Bên cạnh đó chúng tuân thủ các thông số kỹ thuật khác nhau. SFP dự trên giao thứ SFF-8472 còn SFP+ tuân thủ theo SFF-8431 và SFF-8432. Về khả năng tương thích thì các cổng SFP+ thường hỗ trợ SFP nhưng với tốc độ giảm còn 1Gbit/s, và module SFP+ không thể cắm vào cổng SFP, nếu cắm có thể gây lỗi cổng hoặc thiết bị. SFP28 vs SFP+: Có thể sử dụng module SFP28 trong cổng SFP+ không? Câu trả lời chắc chắn là có. Từ những thông tin trên rõ rang SFP28 là phiên bản nâng cấp của SFP+ mà SFP28 đã được nâng cấp để xử lý tốc độ 25Gbit/s trên mỗi làn. Chúng có thiết kế giống nhau và sơ đồ chấn của đầu nối SFP28 và SFP+ cũng tương thích với nhau. Vì vậy SFP28 sẽ hoạt động được với SFP+ nhưng tốc độ còn 10Gbit/s và SFP+ sẽ hoạt động tốt với cổng SFP28 nếu cổng đó có thể được thiết lập với tốc độ truyền là 10Gbit/s nếu không các module SFP+ không thế hoạt động. Khi nói về cable đồng thì cáp đồng SFP28 sở hữu băng thông lớn hơn đáng kể và thất thoát ít hơn so với SFP+. SFP28 vs QSFP28: làm việc theo nguyên tắc khác nhau. Mặc dù trong tên cùng có số 28 nhưng SFP28 và QSFP28 thực sự áp dụng các kích cỡ và nguyên tắc làm việc khác nhau. SFP28 chỉ hỗ trợ 1 kênh với tốc độ 25 Gbit/s trong khi QSFP28 hỗ trợ 4 làn riêng biệt mỗi làn 25 Gbit/s. Cả 2 đều được sử dụng trong các mạng 100G nhưng SFP28 được áp dụng theo như sơ đồ bên dưới: QSFP+ vs QSFP28:Tốc độ khác nhau cho các mục đích sử dụng khác nhau. Module QSFP+ và QSFP28 cùng tích hợp 4 kênh truyền và 4 kênh nhận và chia sẻ cùng kích thước. Bên cạnh đó dòng sản phẩm của QSFP+ và QSFP28 đều bao gồm module quang và cable DAC/AOC nhưng với tốc độ khác nhau. Module QSFP+ hỗ trợ 1 x 40Gbit/s và cáp QSFP+ DAC/AOC hỗ trợ 4 x 10Gbit/s. Module QSFP28 có khả năng truyền dữ liệu với tốc độ 100Gbit/s và cáp QSFP28 DAC/AOC có thể chạy ở tốc độ 4 x 25Gbit/s hoặc 2 x 50Gbit/s. Lưu ý rằng, thông thường các module QSFP28 có thể chia thành các liên kết 10G; nhưng nó có 1 trường hợp khác để chạy QSFP+ với QSFP28 nếu thiết bị Switch hỗ trợ. Trong trường hợp này QSFP28 có thể tách ra thành 4 x 10G giống như module QSFP+. Kết luận: SFP vs SFP+, SFP28 vs SFP+, và QSFP+ vs QSFP28, tất cả sự khác biệt của các cặp module đã được thể hiện trong bài viết này. Mặc dù 1 trong số chúng có chung thiết kế nhưng chúng được thiết kế cho các tốc độ dữ liệu khác nhau. Và từ những so sánh này rõ rang động lực chính đằng sau sự phát triển của module quang là cần phải đạt được tốc độ băng thông cao hơn và kích thước nhỏ hơn. Ví dụ: QSFP28 cung cấp băng thông lớn hơn QSFP+ mặc dù kích thước bằng nhau. (sưu tầm) Know Distinctions Between QSFP-DD & QSFP+/QSFP28/QSFP56/OSFP/CFP8/COBO Please Rate Vote 1 Vote 2 Vote 3 Vote 4 Vote 5 QSFP-DD stands for Quad Small Form Factor Pluggable Double Density. QSFP-DD is though the smallest form factor of 400G transceivers, but provides with the high-density bandwidth in the entire industry, due to which it gained popularity all around. However, as QSFP-DD, or we can say QSFP56-DD, (the other name of QSFP-DD) came into the market and gained popularity, there was a lot of comparisons made with the other form factors like QSFP56, OSFP, CFP8, and COBO. So, as the comparison of QSFP-DD is always made with the other form factors, in this post, we will thoroughly want to discuss what these all form factors are. About QSFP-DD QSFP-DD is the double density QSFP. The QSFP-DD complies with the IEEE802.3bs and QSFP-DD MSA standards. This connector seeing the demand for a higher bandwidth network has been upgraded and is designed to supply eight lane interfaces. Now, this optical transceiver supports 200Gbps and 400Gbps Ethernet applications, which were not supported by any of the previous transceivers. The eight lanes that it operates are supported by either 25 Gb/s NRZ modulation or 50Gb/s PAM4 modulation. Having these transceivers in use will increase the bandwidth and the density of every panel by several times. So, as this provides increased speed and also supports more channels, these are highly compatible to be applied in the high-performance computing data centre and also for the cloud networks. QSFP-DD: The Advantages Are As Follows: The designed system of QSFP-DD is backward compatible. This means the QSFP-DD is compatible with the QSFP modules (such as QSFP+, QSFP28, QSFP56, etc.) The backward compatibility is very critical and advantageous for the end-users and also for the system designers, as it provides flexibility. The QSFP-DD is a 2×1 stacked integrated cage. As the industry needs are growing, most of the pluggable form factors seem to have developed a two-high stacked cage-connector system in extension to a one-high cage connector system. QSFP-DD has the SMT connector and 1xN cage design. With this design, the thermal support of at least 12W per module can be enabled. With the innovative thermal management systems used in the module and cage designs, the QSFP-DD supports power levels of at least 12W per module. Also, as there is a higher thermal level, the heat dissipation capabilities will get reduced, and also unnecessary costs will be cut down. In a single switch slot, QSFP-DD can enable up to 14.4Tb/s aggregate bandwidth. While maintaining the port density, and by quadrupling aggregate switch bandwidth, QSFP-DD can be made to support continuing growth in data centre traffic and network bandwidth demand. The ASIC design supports the multiple interface rates, and as it is fully backward compatible with QSFP+ and QSFP28 modules, therefore it reduces the costs of port and equipment deployment. How Is QSFP-DD Different From QSFP+/QSFP28 & QSFP56 Though QSFP-DD, QSFP+, QSFP28, and QSFP56 are the form factor of QSFP itself, the QSFP-DD is distinct from all three. So, let’s see how QSFP-DD is different from all the three, and how these three are different from each other too, on the basis of the following descriptions: Structure & Number Of Electrical Interface Lanes: The physical structure of the QSFP-DD is more or less similar to the QSFP+, QSFP28, and QSFP56. However, as these are physically the same in size, length, width, and thickness, the QSFP-DD provides an 8-lane electrical interface, instead of providing the 4-lane interface, which the other form factors of QSFP tend to provide. Moreover, the QSFP-DD has ASIC ports that are doubled, which is made to support the existing CAUI-4 interface. Bandwidth The QSFP-DD has been brought into the market, only because there was a need for higher bandwidth. So, compared to the other QSFP modules, the QSFP-DD supports 400Gbps while QSFP+/QSFP28/QSFP56 can respectively reach 40Gbps/100Gbps/200Gbps. Also, if we see the single-channel rate of QSFP-DD, it is 25Gbps NRZ modulation for eight lanes and 50Gbps PAM4 modulation for four lanes, while QSFP56, QSFP28, and QSFP+ have the 50Gbps, 25Gbps, and 10Gbps. Application The application of the QSFP-DD is done at the high-performance computing data centre and the cloud networking centres or at the places that have to set-up their networking and require only the best performance of the network. Also, the other form factors that are QSFP56, QSFP28, and QSFP+ are used at the data centres, or at the places where they suit the best according to their performances. Modulation Technology If we talk about the modulation scheme of all the form factors, then the QSFP+, QSFP28, and QSFP56, each have one type of modulation that is NRZ, MRZ, and PAM4 respectively. But if we talk about the modulation of QSFP-DD, it’s a combination. If you want to draw four lanes, the modulation for eight lanes will be 25Gbps NRZ, and for four lanes it will be 50Gbps PAM4. Backward Compatibility The backward compatibility is very crucial and important for any newer version of any form factor that is coming into the market. Having the system supporting the Backward Compatibility will eliminate the need to start over and deploy new equipment while upgrading to the newer product. So, from reducing the costs to making the deployment of the latest system easy, backward compatibility does its work, well. QSFP-DD And OSFP/CFP8/COBO Now, after talking about the form factors of QSFP, we also need to talk about the form factors of the 400G optics, which are there in the market. So, the form factors that are available in the market of 400G optics are OSFP, CFP8, and COBO. QSFP-DD and OSFP The OSFP is another new pluggable form factor of 400G optics. The OSFP and QSFP-DD both form factors that run eight high-speed electrical lanes, support the 400Gb/s, which can reach upto 800Gb/s as well. Though these both form factors appear to be similar but have three key differences too. The differences are: OSFP allows more power of 15W than the QSFP-DD, which allows 12W. However, the OSFP allows an early adoption, as it is easier to release a technology designed for 15W than 12W, so the consumption of power is more in the OSFP than that of the QSFP-DD. If more power consumption is allowed, the more unnecessary cost will rise, so, QSFP will cost more than QSFP-DD. The QSFP-DD with the QSFP+ (40G), QSFP28 (100G), and QSFP56 (200G) is backward compliant. At the same time, OSFP requires the QSFP to OSFP converter. While the OSFP integrates thermal management directly into the form factor, the QSFP-DD does not do the same. QSFP-DD and CFP8 According to CFP MSA, there are radical differences in the CFP8 and QSFP-DD. CFP8 has 16x channels 25G NRZ on the electrical side, instead of 8x 50G PAM4 which QSFP-DD has. The power consumption CFP8 uses is 24W, which is much higher than the QSFP-DD, which is 12W, since CFP8 is three times larger than that of the QSFP-DD. The more the power consumption will be there, the more unnecessary cost will be increased. The CFP8 can’t be used on the QSFP+ and QSFP28 port, while QSFP-DD can be used on the same. Though CFP8 and QSFP-DD both have the maximum bandwidth of 400Gb/s, the CFP8 can only support in the form of 16x25G or 8x50G, while QSFP-DD supports both and also 200 Gb/s that is 8x25G. QSFP-DD and COBO COBO that is Consortium for On-Board Optics is a non-profit, member-driven, and mutual-benefit corporation that brings together industry leaders to defeat the limitations that are linked with the moving optics inside networking equipment by producing innovative industry specifications. So, the COBO is installed in the controlled environment, internally to the line-card. The COBO lacks flexibility and also does not support hot-pluggable, so to maintain COBO, it takes more effort than that to maintain the QSFP-DD. The form factor, COBO, has two electrical interfaces, the eight-lane, and sixteen lanes, to meet the 1x400G and 2x400G transmission needs. Endnote However, now, as we have compared all the form factors of QSFP and also of the 400G optics, we can clearly see what the differences between all of them are. However, as the QSFP-DD are more compatible in comparison to other form factors of the QSFP; and QSFP-DD and OSFP are better than the other form factors of 400G optics, these are more popular ones in the market too. Also, as the QSFP-DD is the latest form factor and will be soon be brought into use widely, it will be a forerunner in the good development prospect as well. Alongside, when the total bandwidth of 400Gb/s will be applied extensively, it will also lay down the groundwork of the 800G, as the industry leaders have formed the QSFP-DD800MSA group to extend the bandwidth of the QSFP-DD factor from 400Gb/s to 800Gb/s. QSFP56 vs QSFP-DD Which One is Right for You? QSFP56 and QSFP-DD are form factors that describe transceivers that meet specific engineering requirements. QSFP56, or quad small form factor 56, came out in 2017 and by its very nature represented a step forward in design over earlier QSFP modules. QSFP-DD (quad small form factor double-density), was in development at the time, has since been refined and is now on the market. Its elegant intricate engineering architecture ultimately affords customers the option of future upgrades for their networks by accommodating higher speeds and bandwidths to process more data faster. Both offer customers an array of options and come in multiple versions that support longer or shorter reaches. Both were designed for high-performance computing and data centers. Both are carefully engineered, hot pluggable, plug and play, and compatible with many previous QSFP iterations. Which one is right for you? First, an overview of what they are engineered to do. QSFP56 The QSFP56 module has four transmit and receive channels, each capable of 53.125 Gb/s operation which together yield an aggregate data rate of 200Gb/s. It utilizes 850nm, 1310nm, CWDM or LWDM wavelengths to transmit data. QSFP56 uses optical MPO or LC connectors for the optical interface and a 38-pin connector for the electrical interface. Unlike previous QSFP form factors, it leverages PAM4 digital modulation scheme. The QSFP56 was engineered to support 200G Ethernet. QSFP-DD The QSFP-DD (quad small form factor pluggable double-density) optical transceiver is compliant with IEEE802.3bs and QSFP-DD MSA standards. The double-density construction essentially multiplies lanes of electrical interface. While the QSFP28 transmits four lanes of 25Gb/s to achieve a total data rate of 100Gb/s, the 200G QSFP-28 DD (or the 200G QSFP-DD as it’s widely known) is designed with an eight-lane electrical interface and supports a 212.5Gb/s aggregate bit rate in total. The optical interface is either an MPO or duplex LC connector. QSFP-DD is backwards compatible with most QSFP form factors including QSFP 56. QSFP-DD electrical interfaces employ eight lanes that each operate on up to 25 Gbps NRZ modulation or 50 Gbps PAM4 modulation, providing solutions up to 200 Gbps or 400 Gbps respectively. NRZ vs. PAM4 NRZ and PAM4 are two different types of digital modulation techniques. NRZ stands for non return to zero. A modulation technique with two voltage levels representing logic 0 and logic 1, PAM4, or pulse-amplitude modulation, uses four voltage levels to represent four combinations of two bits logic-11, 10, 01, and 00. A PAM4 signal can transmit twice as fast as the traditional NRZ signal. Comparatively speaking, PAM4’s main advantage over NRZ is faster transmittal speed. Although not as fast, NRZ (at 200G) offers other desirable features, including lower power consumption, lower latency and easy deployment. 200G NRZ can achieve low-cost optical interconnection within data centers. QSFP56 vs QSFP-DD: Comparative Advantages and Disadvantages QSFP56 was designed to support 200G applications and cannot accommodate an upgrade of networks to 400G and beyond; QSFP-DD runs in both 200G and 400G versions and allows incremental network upgrades; QSFP56 uses PAM4 modulation. QSFP-DD typically runs on NRZ for 200G speeds; QSFP56 modules with PAM4 modulation require only the use of four lanes for 200G transmission, in contrast to eight lanes for QSFP-DD which saves fiber cost and reduces link loss; 200G QSFP-DD modules that run on NRZ modulation are not as fast but have other advantages: they have lower maintenance costs, consume less energy, have less latency, better BER ( Pre-FEC = E-8, post FEC = E-12) and are easy to deploy. QSFP-DD offers greater flexibility for network and systems engineers for upgrading networks; One of the upgrade options is a breakout application where higher speed QSFP-DD can be broken out to lower speed legacy form factors. QSFP-DD is backwards compatible with earlier iterations of QSFP modules, including QSFP56; QSFP56 is backwards compatible with QSFP-28 iterations but not with QSFP-DD; QSFP-DD transceivers are, generally speaking, more expensive but rising market demand may drive prices down. Conclusion Does your networking equipment accommodate upgrades to QSFP-DD? Not all switches, and routers, are configured to support QSFP-DD so stepping up to faster link speeds might be impossible or very costly. If you don’t have the right equipment, you incur the risk of greater signal-to-noise ratio and more interference in transmitting data. If that’s the case, QSFP56 might be a better choice. If initial set-up cost is a concern, QSFP56 may be the better choice. If cost is not an issue, you have the compatible hardware and want to have the capability of future upgrades and more complex configurations, QSFP-DD offers more possibilities and might be a better choice. QSFP-DD transceivers can cost anywhere from 15% to 30% more than QSFP56 transceivers at comparable reaches. However, 200G QSFP-DD makes up for this initial cost by lower maintenance costs: it consumes less energy and power. Additionally, it achieves lower latency. Regardless of which 200G transceiver you choose, both are good choices. Now’s the time to upgrade to 200G if you haven’t already done so. Vitex engineers and technical support staff, with more than two decades of fiber optics engineering experience can customize solutions and provide guidance on the right products for your needs. Contact us at [email protected] to discuss your requirements. 키워드에 대한 정보 qsfp28 vs qsfp-dd 다음은 Bing에서 qsfp28 vs qsfp-dd 주제에 대한 검색 결과입니다. 필요한 경우 더 읽을 수 있습니다. 이 기사는 인터넷의 다양한 출처에서 편집되었습니다. 이 기사가 유용했기를 바랍니다. 이 기사가 유용하다고 생각되면 공유하십시오. 매우 감사합니다! 사람들이 주제에 대해 자주 검색하는 키워드 QSFP+ vs. QSFP28 Transceivers: The Breakdown qsfp28 qsfp+ qsfp plus qsfp28 transceiver qsfp28 optics qsfp+ transceiver qsfp+ optics qsfp28 vs qsfp+ qsfp28 plus transceiver qsfp28 vs qsfp+ transceivers qsfp plus vs qsfp28 qsfp28 100g 40g qsfp+ 40g qsfp plus qsfp quad small form factor pluggable what is qsfp+ what is qsfp28 QSFP+ #vs. #QSFP28 #Transceivers: #The #Breakdown YouTube에서 qsfp28 vs qsfp-dd 주제의 다른 동영상 보기 주제에 대한 기사를 시청해 주셔서 감사합니다 QSFP+ vs. QSFP28 Transceivers: The Breakdown | qsfp28 vs qsfp-dd, 이 기사가 유용하다고 생각되면 공유하십시오, 매우 감사합니다.
The Big Differences Between SFP, SFP+, SFP28, QSFP+, QSFP28, QSFP-DD, and OSFP
Every IT manager is familiar with SFP or SFP+ optics, independent devices linked daily to switch or network devices. Do you also have a working knowledge of SFP28, QSFP+, QSFP28, and QSFP-DD optics? What is the main difference between them? In this post, we’ll go over the key differences between the SFP+, SFP28, QSFP+, QSFP28, and QSFP-DD transceivers and everything you need to know before making a purchase.
Pluggable Transceiver Optics are generally broken down into seven broad categories: SFP, SFP+, QSFP+, SFP28, QSFP28, QSFP-DD, and OSFP. These terms refer to the form factor and transmission data rate.
Table of Contents:
What is an SFP Transceiver? SFP stands for small form-factor pluggable. It is also known as a “mini-GBIC” (gigabit interface converter). An SFP transceiver is a tiny transceiver that links fiber optic cables to various networking devices such as switches, routers, network cards, and wireless access points. Multiple SFP transceivers are available, depending on data rate and application, including 155M SFP, 622M SFP, 1G SFP, 2.5G SFP, 2G/4G Fiber Chanel SFP, 3G SFP, and 6G SFP. They are used in fiber-optic Ethernet networks, particularly common in commercial networks. SFP transceivers are one of the most widely utilized fiber-optic networking equipment nowadays.
What is an SFP+ Transceiver?
Compared to SFP transceivers, SFP+ transceivers are a more advanced version of the technology. SFP+ transceivers are most typically offered at 8Gbps, 10Gbps, or 16Gbps. They have the exact dimensions of SFPs, making it simple to integrate them into existing infrastructure. SFP+ transceiver is one of the most popular data center cabling applications.
Depending on the application, the SFP+ transceiver can be divided into five broad categories: Dual Fiber SFP+, BiDi SFP+, Copper SFP+, CWDM SFP+, and DWDM SFP+.
Read more: What is SFP+ Transceiver?
What is the SFP28 Transceiver?
SFP28 stands for Small Form-Factor Pluggable 28. It is the third generation of SFP connection systems built for 25G throughput following the IEEE 802.3by specification (25GBASE-CR). The SFP28 is an improved version of the SFP+ designed for 25G signal transmission. The SFP28 has the typical form factor as the SFP+, but it offers 25Gbps electrical connections per channel. Compared with SFP+, SFP28 provides a much higher bandwidth capability.
Depending on the application, the SFP28 transceiver can be divided into six broad categories: Dual Fiber SFP28, BiDi SFP28, CWDM SFP28, DWDM SFP28, SFP28 DAC, and SFP28 AOC.
Read more: Understanding the difference between SFP+ and SFP28 Transceiver
What is a QSFP+ Transceiver? QSFP+, often known as QSFP, is an abbreviation for quad (4-channel) small form-factor pluggable. QSFP+ optics is yet another tiny, hot-pluggable transceiver used in data transmission. Compared to SFP+, QSFP+ supports 4x10G or 4x14G SFP+ data rates to enable increased bandwidth capabilities. It provides several data rate options for Ethernet, Fibre Channel, InfiniBand, and SONET/SDH technologies.
What is a QSFP28 Transceiver?
QSFP28 is an abbreviation for quad small form-factor pluggable 28. The QSFP28 transceiver is intended for use with 100 Gigabit Ethernet, EDR InfiniBand, or 32G Fibre Channel networks. The QSFP28 100G transceiver has four high-speed differential signal channels with data rates ranging from 25 Gbps to 40 Gbps. In the 100G optics market, QSFP28 transceivers are more popular than CFP, CFP2, and CFP4 form factors.
What is a QSFP-DD Transceiver?
Quad Small Form Factor Pluggable Double Density (QSFP-DD) is also known as QSFP56-DD. The QSFP-DD transceiver is a new optical module comparable to the current QSFP but adds an extra row of contacts for an eight-lane electrical interface. All QSFP-DD-based transceivers from 40G to 200G are backward compatible with QSFP+. In a single rack unit (RU), QSFP-DD can support 36 400GbE ports, with a total bandwidth of nearly 14Tb/s.
What is an OSFP Transceiver? The OSFP acronym stands for Octal Small Form-factor Pluggable. The OSFP MSA designed it. Google launched the OSFP MSA group, which Arista Networks heads. OSFP is a revolutionary pluggable form factor that offers eight high-speed electrical channels at 400 Gbps (8x50G or 4x100G). However, it supports 32 OSFP ports per 1U front panel and 14.4 Tbps per 1U swap slot. OSFP optics with improved signal integrity and thermal performance are being developed to suit the next generation of 800G optics. The OSFP may also be used with 100G QSFP optics.
SFP vs. SFP+ vs. SFP28 vs. QSFP+ vs. QSFP28 vs. QSFP-DD vs. OSFP, What is the difference?
Phân biệt, so sánh các bộ thu phát quang (module quang) SFP vs SFP+ vs SFP28 vs QSFP+ vs QSFP28.
SFP, SFP+, SFP28, QSFP+ và QSFP28 là các loại module quang khác nhau. Và tất cả đều có tính năng hot-pluggable (cắm nóng) được sử dụng để kết nối giữa Switch với các thiết bị mạng khác (ví dụ như Server, các bộ chuyển đổi quang điện…) để truyền dữ liệu. Vì vậy sự khác biệt giữa SFP vs SFP +, SFP28 vs SFP +, QSFP vs QSFP28 là gì? QSFP28 có tương thích với QSFP+ không? Chúng ta có thể sử dụng module quang SFP28 trong các cổng SFP+ không? Bài viết này sẽ giúp chúng ta trả lời các câu hỏi đó.
Giới thiệu về các loại module quang:
Trước khi tìm ra sự khác biệt giữa SFP và SFP+, SFP28 và SFP+, QSFP và QSFP28 ta cần phải biết SFP, SFP +, SFP28, QSFP và QSFP28 là gì.
SFP
SFP (small form-factor pluggable) có thể được coi là phiên bản nâng cấp của GBIC (Gigabit interface converter). Nó chỉ nhỏ bằng một nửa module Gbic, giúp tăng đáng kể mật độ cổng trên các thiết bị mạng. Tốc độ dữ liệu của SFP dao động từ 100 Mbps đến 4Gbit/s.
SFP+
SFP+ (small form-factor pluggable plus) là phiên bản nâng cấp của SFP. Hỗ trợ lên đến 8 Gbit/s trên kênh truyền quang, 10 Gigabit trên Ethernet và mạng truyền tải quang tiêu chuẩn OTU2. SFP+ cũng giới thiệu tính năng gắn trực tiếp để liên kết 2 cổng SFP+ mà không cần thêm module quang, bao gồm DAC (direct attach cable) và AOC (active optical cable), là giải pháp tuyệt vời cho kết nối trực tiếp khoảng cách ngắn giữa 2 thiết bị mạng liền kề.
SFP28
SFP28 (small form-factor pluggable 28) là phiên bản nâng của SFP+. SFP28 có cùng hình dáng như SFP+ nhưng hỗ trợ lên đến 25Gb/s. SFP28 cũng cấp thêm phương thức để nâng cấp mạng: 10G – 25G – 40G – 100G, đây là 1 giải pháp tiết kiệm năng lượng để đáp ứng nhu cầu ngày càng tăng của các Data Center thế hệ tiếp theo.
QSFP+
QSFP+ là 1 sự phát triển của QSFP (quad small form-factor pluggable). QSFP có thể mang 4 kênh đồng thời và mỗi kênh có thể xử lý tốc độ dữ liệu 1Gbit/s dó đó nó có tên Quad SFP. Không giống như QSFP, QSFP+ hỗ trợ 4 kênh x 10Gbit/s và 4 kênh có thể được kết hợp thành 1 liên kết có tốc độ 40 Gbit/s. Module QSFP+ có thể thay thế cho 4 module SFP+ tiêu chuẩn, dẫn đến mật độ cổng sẽ lớn hơn và tiết kiệm được chi phí cho hệ thống so với các sản phẩm SFP+.
QSFP28
QSFP28 (quad small form-factor pluggable 28) được thiết kế cho các ứng dụng tốc độ 100G. Nó cũng cấp bốn kênh tốc độ cao với tốc độ xử lý dữ liệu từ 25Gbps đến khả năng 40Gbps, và cuối cùng đáp ứng 100Gbps (4 x 25Gbps) và các yêu cầu tốc độ dữ liệu cao (EDR) 100Gbps. Lưu ý rằng, QSFP28 có thể thực hiện được các kết nối đột phá 4x 25G và 2 x 50G hoặc 1 x 100G tùy thuộc vào loại module quang được sử dụng.
So sánh SFP vs SFP+ vs SFP28 vs QSFP+ vs QSFP28
Sau khi đã tìm hiểu SFP/SFP+/SFP28/QSFP+/QSFP28 là gì, sau đây chúng ta sẽ đưa ra những so sánh chi tiết giữa SFP vs SFP+, SFP28 vs SFP+, QSFP vs QSFP28 and SFP28 vs QSFP28.
SFP vs SFP+: Có cùng kích thước nhưng tốc độ và độ tương thích khác nhau.
Bộ thu phát SFP và SFP+ đều có kích thước và hình dáng giống nhau. Điều này cho phép nhà sản xuất thiết bị sử dụng lại các thiết kế vật lý của SFP hiện có cho các thiết bị chuyển mạch với cổng SFP+. Về sự khác biệt thì 1 điều rõ rang là chúng hỗ trợ các tốc độ truyền khác nhau, SFP lên tới 4Gbit/s trong khi SFP+ là 10Gbit/s. Bên cạnh đó chúng tuân thủ các thông số kỹ thuật khác nhau. SFP dự trên giao thứ SFF-8472 còn SFP+ tuân thủ theo SFF-8431 và SFF-8432. Về khả năng tương thích thì các cổng SFP+ thường hỗ trợ SFP nhưng với tốc độ giảm còn 1Gbit/s, và module SFP+ không thể cắm vào cổng SFP, nếu cắm có thể gây lỗi cổng hoặc thiết bị.
SFP28 vs SFP+: Có thể sử dụng module SFP28 trong cổng SFP+ không?
Câu trả lời chắc chắn là có. Từ những thông tin trên rõ rang SFP28 là phiên bản nâng cấp của SFP+ mà SFP28 đã được nâng cấp để xử lý tốc độ 25Gbit/s trên mỗi làn. Chúng có thiết kế giống nhau và sơ đồ chấn của đầu nối SFP28 và SFP+ cũng tương thích với nhau. Vì vậy SFP28 sẽ hoạt động được với SFP+ nhưng tốc độ còn 10Gbit/s và SFP+ sẽ hoạt động tốt với cổng SFP28 nếu cổng đó có thể được thiết lập với tốc độ truyền là 10Gbit/s nếu không các module SFP+ không thế hoạt động. Khi nói về cable đồng thì cáp đồng SFP28 sở hữu băng thông lớn hơn đáng kể và thất thoát ít hơn so với SFP+.
SFP28 vs QSFP28: làm việc theo nguyên tắc khác nhau.
Mặc dù trong tên cùng có số 28 nhưng SFP28 và QSFP28 thực sự áp dụng các kích cỡ và nguyên tắc làm việc khác nhau. SFP28 chỉ hỗ trợ 1 kênh với tốc độ 25 Gbit/s trong khi QSFP28 hỗ trợ 4 làn riêng biệt mỗi làn 25 Gbit/s. Cả 2 đều được sử dụng trong các mạng 100G nhưng SFP28 được áp dụng theo như sơ đồ bên dưới:
QSFP+ vs QSFP28:Tốc độ khác nhau cho các mục đích sử dụng khác nhau.
Module QSFP+ và QSFP28 cùng tích hợp 4 kênh truyền và 4 kênh nhận và chia sẻ cùng kích thước. Bên cạnh đó dòng sản phẩm của QSFP+ và QSFP28 đều bao gồm module quang và cable DAC/AOC nhưng với tốc độ khác nhau. Module QSFP+ hỗ trợ 1 x 40Gbit/s và cáp QSFP+ DAC/AOC hỗ trợ 4 x 10Gbit/s. Module QSFP28 có khả năng truyền dữ liệu với tốc độ 100Gbit/s và cáp QSFP28 DAC/AOC có thể chạy ở tốc độ 4 x 25Gbit/s hoặc 2 x 50Gbit/s. Lưu ý rằng, thông thường các module QSFP28 có thể chia thành các liên kết 10G; nhưng nó có 1 trường hợp khác để chạy QSFP+ với QSFP28 nếu thiết bị Switch hỗ trợ. Trong trường hợp này QSFP28 có thể tách ra thành 4 x 10G giống như module QSFP+.
Kết luận:
SFP vs SFP+, SFP28 vs SFP+, và QSFP+ vs QSFP28, tất cả sự khác biệt của các cặp module đã được thể hiện trong bài viết này. Mặc dù 1 trong số chúng có chung thiết kế nhưng chúng được thiết kế cho các tốc độ dữ liệu khác nhau. Và từ những so sánh này rõ rang động lực chính đằng sau sự phát triển của module quang là cần phải đạt được tốc độ băng thông cao hơn và kích thước nhỏ hơn. Ví dụ: QSFP28 cung cấp băng thông lớn hơn QSFP+ mặc dù kích thước bằng nhau.
(sưu tầm)
QSFP56 vs QSFP-DD
Which One is Right for You?
QSFP56 and QSFP-DD are form factors that describe transceivers that meet specific engineering requirements. QSFP56, or quad small form factor 56, came out in 2017 and by its very nature represented a step forward in design over earlier QSFP modules. QSFP-DD (quad small form factor double-density), was in development at the time, has since been refined and is now on the market. Its elegant intricate engineering architecture ultimately affords customers the option of future upgrades for their networks by accommodating higher speeds and bandwidths to process more data faster.
Both offer customers an array of options and come in multiple versions that support longer or shorter reaches.
Both were designed for high-performance computing and data centers. Both are carefully engineered, hot pluggable, plug and play, and compatible with many previous QSFP iterations. Which one is right for you?
First, an overview of what they are engineered to do.
QSFP56
The QSFP56 module has four transmit and receive channels, each capable of 53.125 Gb/s operation which together yield an aggregate data rate of 200Gb/s. It utilizes 850nm,
1310nm, CWDM or LWDM wavelengths to transmit data. QSFP56 uses optical MPO or LC connectors for the optical interface and a 38-pin connector for the electrical interface. Unlike previous QSFP form factors, it leverages PAM4 digital modulation scheme.
The QSFP56 was engineered to support 200G Ethernet.
QSFP-DD
The QSFP-DD (quad small form factor pluggable double-density) optical transceiver is compliant with IEEE802.3bs and QSFP-DD MSA standards.
The double-density construction essentially multiplies lanes of electrical interface. While the QSFP28 transmits four lanes of 25Gb/s to achieve a total data rate of 100Gb/s, the 200G QSFP-28 DD (or the 200G QSFP-DD as it’s widely known) is designed with an eight-lane electrical interface and supports a 212.5Gb/s aggregate bit rate in total. The optical interface is either an MPO or duplex LC connector.
QSFP-DD is backwards compatible with most QSFP form factors including QSFP 56.
QSFP-DD electrical interfaces employ eight lanes that each operate on up to 25 Gbps NRZ modulation or 50 Gbps PAM4 modulation, providing solutions up to 200 Gbps or 400 Gbps respectively.
NRZ vs. PAM4
NRZ and PAM4 are two different types of digital modulation techniques. NRZ stands for non return to zero.
A modulation technique with two voltage levels representing logic 0 and logic 1, PAM4, or pulse-amplitude modulation, uses four voltage levels to represent four combinations of two bits logic-11, 10, 01, and 00.
A PAM4 signal can transmit twice as fast as the traditional NRZ signal.
Comparatively speaking, PAM4’s main advantage over NRZ is faster transmittal speed. Although not as fast, NRZ (at 200G) offers other desirable features, including lower power consumption, lower latency and easy deployment. 200G NRZ can achieve low-cost optical interconnection within data centers.
QSFP56 vs QSFP-DD: Comparative Advantages and Disadvantages
QSFP56 was designed to support 200G applications and cannot accommodate an upgrade of networks to 400G and beyond;
QSFP-DD runs in both 200G and 400G versions and allows incremental network upgrades;
QSFP56 uses PAM4 modulation. QSFP-DD typically runs on NRZ for 200G speeds;
QSFP56 modules with PAM4 modulation require only the use of four lanes for 200G transmission, in contrast to eight lanes for QSFP-DD which saves fiber cost and reduces link loss;
200G QSFP-DD modules that run on NRZ modulation are not as fast but have other advantages: they have lower maintenance costs, consume less energy, have less latency, better BER ( Pre-FEC = E-8, post FEC = E-12) and are easy to deploy.
QSFP-DD offers greater flexibility for network and systems engineers for upgrading networks; One of the upgrade options is a breakout application where higher speed QSFP-DD can be broken out to lower speed legacy form factors.
QSFP-DD is backwards compatible with earlier iterations of QSFP modules, including QSFP56;
QSFP56 is backwards compatible with QSFP-28 iterations but not with QSFP-DD;
QSFP-DD transceivers are, generally speaking, more expensive but rising market demand may drive prices down.
Conclusion
Does your networking equipment accommodate upgrades to QSFP-DD? Not all switches, and routers, are configured to support QSFP-DD so stepping up to faster link speeds might be impossible or very costly. If you don’t have the right equipment, you incur the risk of greater signal-to-noise ratio and more interference in transmitting data. If that’s the case, QSFP56 might be a better choice.
If initial set-up cost is a concern, QSFP56 may be the better choice.
If cost is not an issue, you have the compatible hardware and want to have the capability of future upgrades and more complex configurations, QSFP-DD offers more possibilities and might be a better choice.
QSFP-DD transceivers can cost anywhere from 15% to 30% more than QSFP56 transceivers at comparable reaches. However, 200G QSFP-DD makes up for this initial cost by lower maintenance costs: it consumes less energy and power. Additionally, it achieves lower latency.
Regardless of which 200G transceiver you choose, both are good choices. Now’s the time to upgrade to 200G if you haven’t already done so.
Vitex engineers and technical support staff, with more than two decades of fiber optics engineering experience can customize solutions and provide guidance on the right products for your needs. Contact us at [email protected] to discuss your requirements.
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