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.

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.

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.

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.