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Customized 400G QSFP-DD to 2 x 200G QSFP56 Passive Direct Attach Copper Breakout Cable


≤0.5W 33.5mm 30AWG Twinax

FS P/N: QDD-400G-2QPCxxx
FS P/N: QDD-400G-2QPCxxx
3 Sold
4 Reviews
0 Question
Cable Length:
0.5m (2ft)
Compatible Brands:
Device Number:
Pre-order, Ship by 18 Jul, 2024
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Deliver to New York, 10010
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5-Year Warranty

400G QSFP-DD to 2x200G QSFP56 DAC Breakout Cable (Customized length, Passive, QSFP-DD to 2 QSFP56)

The 400G QSFP-DD to 2x200G QSFP56 DAC Breakout cable assembly is designed to meet the high-density requirements of standard and combo connector configurations. QSFP-DD pluggable solutions enable 400G transmission. It is fully compliant with SFF-8679, QSFP-DD MSA, IEEE802.3bj, and IEEE802.3cd standards.

Note: The FS P/N is changed from Q-2Q56PCxx to QDD-400G-2QPCxxx, but the product is the same. Only the FS P/N has been changed.

Part Number
Vendor Name
Connector Type
Max Data Rate
Cable Type
Passive Twinax
Cable Length
Power Consumption
Jacket Material
Commercial Temperature Range
0 to 70°C (32 to 158°F)
IEEE802.3Bj, By, IEEE802.3CD, SFF-8679, SFF-8636
400G Ethernet

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To get the detailed certification, please go to the Product Compliance Status for download.
Please Note: Installing a third party transceiver does not void your network equipment warranty. Network equipment manufacturers all have guidelines stating that warranty support on their products will not be affected.
Enable Seamless Connectivity for Your Network
Dual-compatibility customization provides DAC cables with different compatibility on both sides based on your models, ideal for achieving border-less connectivity.
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United States

September 20, 2023
Shipment & Delivery: On time and packaged securely with no damage to package or items delivered.
Verified Purchase
Helpful 4
Comment 0


United States

June 21, 2020
Bought these cables for upgrading our data center to 400G. Initially, we were worried about whether these cables would work on our Arista switches. They even did a compatibility test on these cables and provided a report for us. These DACs worked and fitted perfectly on our devices. Very stable connection. Five stars!
Verified Purchase
Helpful 11
Comment 0


United States

March 16, 2020
Our new data center planned to upgrade to 400G. For our in-rack links, FS guys recommended the 400G to 2x 200G QSFP56 DAC cables. I did a test when I received them, the TX and RX powers were in spec. And the transmission was stable.
Verified Purchase
Helpful 30
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