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QSFP-DD DAC - Quad Small Form Factor Pluggable Double Density Direct Attach Passive Copper Cable
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QSFP-DD DAC - Quad Small Form Factor Pluggable Double Density Direct Attach Passive Copper Cable

QSFP-DD DAC - Quad Small Form Factor Pluggable Double Density Direct Attach Passive Copper Cable

The QSFP-DD has 8-lane electrical interfaces with data transmission rates of up to 28Gbps NRZ or 56Gbps PAM4, achieving total data rates of up to 200Gbps, 400Gbps, or 800Gbps. The QSFP-DD connectors and cable assemblies comply with the IEEE 802.3bj, InfiniBand EDR, and SAS 3.0 specifications, making them suitable for various next-generation technologies and applications. The QSFP-DD (Quad Small Form-factor Pluggable Double Density) utilizes 8 electrical lanes (supporting 28 Gbps NRZ or 56 Gbps PAM-4 for aggregate per-port rates of 200, 400, or 800 Gbps) to double the density of QSFP interconnects, effectively. The backward compatibility of the QSFP-DD product portfolio allows existing QSFP modules to be inserted into QSFP-DD ports. The QSFP-DD enclosure incorporates a proprietary heatsink design, making it the only low-cost solution for applications requiring 15-18W power—offering superior thermal management and signal integrity.

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Description

The QSFP-DD has 8-lane electrical interfaces with data transmission rates of up to 28Gbps NRZ or 56Gbps PAM4, achieving total data rates of up to 200Gbps, 400Gbps, or 800Gbps. The QSFP-DD connectors and cable assemblies comply with the IEEE 802.3bj, InfiniBand EDR, and SAS 3.0 specifications, making them suitable for various next-generation technologies and applications. The QSFP-DD (Quad Small Form-factor Pluggable Double Density) utilizes 8 electrical lanes (supporting 28 Gbps NRZ or 56 Gbps PAM-4 for aggregate per-port rates of 200, 400, or 800 Gbps) to double the density of QSFP interconnects, effectively. The backward compatibility of the QSFP-DD product portfolio allows existing QSFP modules to be inserted into QSFP-DD ports. The QSFP-DD enclosure incorporates a proprietary heatsink design, making it the only low-cost solution for applications requiring 15-18W power-offering superior thermal management and signal integrity.
 
 

Features:

1.  Doubles QSFP density with 8 differential pairs, each capable of 112Gbps, for 800G
2.  Provides superior thermal performance and signal integrity
3.  Supports next-gen high-density data center/cloud computing data transmission
4.  Compliant with IEEE 802.3cd standard. Maximum cable meets IEEE 802.3cd SDD21 requirements: -17.28dB at 13.28 GHz
5.  Supports InfiniBand QDR, FDR, EDR, HDR, NDR
6.  Compliant with QSFP DD MSA, CMIS4.0
7.  Maximum installation of 16 pairs of 28AWG cables (2.5m), minimum for 32AWG
8.  8-channel full-duplex passive copper cable assembly
9. QSFP-DD connector compliant with MSA standard
10. Compliant with the SFF-8636 standard
11. Data rate up to 400Gbps (8x 50Gbps)
12. Copper link length up to 3 meters (passive limit applies)
13. Excellent signal integrity, low insertion loss, and low crosstalk
14. Operating temperature range: 0°C to 70°C
15. Power supply voltage: 3.3V
16. RoHS-compliant

 

Configuration Options:

 

QSFP-DD to QSFP-DD
QSFP-DD to 2x and 4x QSFP28/56 modules
QSFP-DD to 8x SFP28/56

 

Product Applications:

 

200G/400G Ethernet
InfiniBand HDR
Servers, hubs, ethernet switches, routers, and data centers
 

What is QSFP-DD and What are the differences between QSFP-DD and other optical modules?

 

QSFP-DD is the smallest form factor for 400G optical modules, offering the highest bandwidth density in the industry while leveraging backward-compatible with lower-speed QSFP pluggable modules and cables, making it popular among fiber optic manufacturers. As the latest hot optical transceiver for 400G high-speed applications, QSFP-DD is often compared with other modules such as QSFP56, OSFP, CFP8, COBO, etc. So, what are the differences between these optical modules? 
 

💫QSFP-DD


QSFP-DD (also known as QSFP56-DD) stands for Quad Small Form-factor Pluggable Double Density. It is fully compliant with IEEE802.3bs and QSFP-DD MSA standards. The "Double Density" refers to the module supporting twice the number of high-speed electrical interfaces compared to the standard QSFP28 module. Through Non-Return-to-Zero (NRZ) modulation technology, the data rate per channel can reach 25Gb/s, achieving 200G network transmission. Additionally, through PAM4 modulation technology, the data rate per channel can reach 50Gb/s, achieving 400G network transmission, suitable for high-performance computing data centers and cloud networks.
 

📌Advantages of QSFP-DD are as follows:

Backward-compatible: Allows QSFP-DD to support existing QSFP modules (such as QSFP+, QSFP28, QSFP56, etc.), providing flexibility for end users and system designers.
2x1 Stacked Integrated Cage/Connector: Supports single-high cage connectors and two-layer stacked cage connector systems.
SMT Connector and 1xN Cage Design: This design can provide at least 12W of thermal support per module. Higher thermal performance reduces the requirement for transceiver cooling capabilities, thereby lowering some unnecessary costs.
ASIC chip design: Supports multiple interface rates, fully backward-compatible with QSFP+ and QSFP28 modules, thereby reducing port and equipment deployment costs.
 

🛫QSFP-DD compared to QSFP+/QSFP28/QSFP56


QSFP-DD, QSFP+, QSFP28, and QSFP56 all fall under the QSFP form factor, but what sets them apart? The following explanations clarify these differences.
 

📍Structure


In appearance, the width, length, and thickness of QSFP-DD are the same as QSFP+, QSFP28, and QSFP56. However, the QSFP-DD module is equipped with 8-channel electrical interfaces instead of 4-channel like other QSFP modules, and the ASIC interface 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 other QSFP system transceivers to accommodate the additional rows of contacts.
 

📍Bandwidth and Application


The QSFP-DD module supports 400Gbps, compared to 40Gbps, 100Gbps, and 200Gbps for QSFP+, QSFP28, and QSFP56, respectively. Therefore, QSFP-DD connectors are used for 400G transceivers, DACs, and AOCs, and are applied in 400G data center interconnects. QSFP+/QSFP28/QSFP56 modules and DAC/AOCs are used for 40G/100G/200G network interconnects.
 

📍Backward-compatible


As mentioned above, QSFP-DD can be backward-compatible with previous QSFP system transceiver modules. In other words, based on the previous form factor, QSFP-DD has been technically upgraded to support increased bandwidth. Its backward-compatible capability can avoid the scale replacement of existing equipment, effectively reducing network upgrade costs.
 

QSFP-DD can be backward-compatible with previous QSFP system transceiver modules

 

QSFP-DD versus OSFP/CFP8/COBO


QSFP-DD (QSFP56-DD) and OSFP/CFP8/COBO are form factors for 400G optics in the market, and their differences are as follows:
 

🚩QSFP-DD versus OSFP


OSFP is a new pluggable form factor with 8 high-speed electrical channels, initially supporting 400Gb/s (8x50G) or up to 800Gb/s. The width, length, and thickness of QSFP-DD are 18.35mm, 89.4mm, and 8.5mm, respectively, while those of OSFP are 22.58mm, 107.8mm, and 13.0mm, respectively. It is clear that the OSFP form factor is slightly wider and deeper than QSFP-DD, but it still supports 36 OSFP ports per 1U front panel, supporting 14.4Tb/s per 1U.
Generally, the power consumption of QSFP-DD is 7-12W, while OSFP can reach 12-15W. The lower the power consumption, the better the performance of the transceiver. Unlike QSFP-DD, OSFP cannot be backward-compatible with QSFP+/QSFP28 because its size is larger than QSFP+/QSFP28.
ADOP's OSFP modules adopt the latest technology and standards, supporting data transmission rates of up to 800Gbps, providing excellent network performance for network operators and enterprise users. In addition to Ethernet protocols, ADOP's 800G OSFP also supports InfiniBand (IB) protocols, providing more choices for high-performance computing and data center interconnects. Whether handling large-scale data analysis tasks or supporting artificial intelligence and machine learning applications, our 800G OSFP modules can meet your needs and provide strong support for your business.
 

🚩QSFP-DD versus CFP8


The CFP8 module adopts a form factor of 41.5mm107.5mm9.5mm, with bandwidth four times that of existing 100G solutions. Its electrical interfaces are typically specified to allow 16x25 Gb/s and 8x50 Gb/s modes. Since the size of CFP8 is almost three times that of QSFP-DD, the power consumption of CFP8 is much higher than that of QSFP-DD. At the same time, CFP8 cannot be used on QSFP+/QSFP28 ports. Both CFP8 and QSFP-DD have a maximum bandwidth of 400Gb/s, but CFP8 only supports 16x25G or 8x50G forms, while QSFP-DD also supports 200Gb/s (8x25G).
 

🚩QSFP-DD versus COBO


COBO stands for Consortium for On-Board Optics, which can be installed inside line card devices in a controlled environment, lacking flexibility. Moreover, it does not support hot-swapping, so COBO modules are more difficult to maintain than QSFP-DD. Additionally, the COBO form factor has two electrical interfaces, one with 8 channels and the other with 16 channels, to meet the requirements of 1x400G and 2x400G transmissions.
The chart below illustrates the market maturity of QSFP-DD, OSFP, CFP8, and COBO form factors. The higher the number, the higher the market maturity of these form factors.

The chart illustrates the market maturity of QSFP-DD, OSFP, CFP8, and COBO form factors. The higher the number, the higher the market maturity of these form factors.

From the table, it can be seen that the overall ratings of QSFP-DD and OSFP form factors are higher than those of other form factors. Therefore, QSFP-DD and OSFP are more popular among fiber manufacturers. The former is suitable for data center applications, while the latter is commonly used in telecommunications applications. For more types of 400G optical modules, please refer to ✨The Future is Here: The Infinite Possibilities of 400G Optical Modules✨ - CSDN Blog for more detailed information.
 

✨Will QSFP-DD be poised to be popular in 800G Ethernet?


QSFP-DD (QSFP56-DD) is more suitable for data center applications than OSFP. With the concentration of east-west traffic in data centers and the increasing bandwidth pressure inside data centers, the time gap between the application of high-speed optical modules in the telecommunications market and the data center market is gradually narrowing. 400G optics will be widely applied. That is to say, QSFP-DD will benefit from 400G Ethernet and has a good development prospect.
the time gap between the application of high-speed optical modules in the telecommunications market and the data center market is gradually narrowing.
 
With the large-scale commercialization of 400G, the single-wave 100G technology will mature, laying the foundation 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 continuing the current QSFP-DD form factor to support the next-generation QSFP-DD800 with a single-channel rate of 100Gbps for 8 channels. This also means that 800G may still adopt the QSFP-DD form factor, bringing greater advantages and value to internet service providers.
ADOP is committed to providing reliable and effective high-speed network solutions, standing at the forefront of the industry. ADOP offers a series of 800G QSFP-DD optical modules, ensuring that each module undergoes rigorous testing with professional equipment and obtains multiple international certifications. By prioritizing quality assurance, ADOP also maintains sufficient inventory levels to quickly meet customer needs.
 
 
 
 

 

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