400G OSFP Breakout InfiniBand HDR
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- 400Gbps to 2x 200Gbps
- OSFP to 2x QSFP56
- Finned Top
- AOC
400G OSFP Finned Top to 2x 200G QSFP56 InfiniBand HDR Active Optical Breakout Cable
O400-2Q-HDR-A
In Stock Ready to Ship
US$809.00 -
Hot
- 400Gbps to 2x 200Gbps
- OSFP to 2x QSFP56
- Finned Top
- DAC
400G OSFP Finned Top to 2x 200G QSFP56 InfiniBand HDR Passive Direct Attach Copper Breakout Cable
O400-2Q-HDR-C
In Stock Ready to Ship
US$90.00
400G OSFP Breakout InfiniBand HDR Overview
The 400G OSFP Breakout InfiniBand HDR category contains two breakout cables: one passive DAC and one AOC. Both models divide one 400G finned-top OSFP interface into two 200G QSFP56 branches, with each branch using four 50G PAM4 channels. Available in lengths from 1m to 50m, the series supports InfiniBand HDR connections from Quantum-2 or Spectrum-4 switches to ConnectX-6/7 adapters, BlueField-2/3 DPUs, servers, GPU computing systems, and storage platforms.
O400-2Q-HDR-C is a 1–2m passive copper breakout cable connecting one 400G finned-top OSFP port to two 200G flat-top QSFP56 ports. Each QSFP56 branch carries 200G over four 50G PAM4 channels for short-distance switch-to-server, GPU, adapter, DPU, or storage connections.
O400-2Q-HDR-A is a 1–50m active optical breakout cable that divides one 400G finned-top OSFP interface into two 200G flat-top QSFP56 connections. It supports longer InfiniBand HDR links between OSFP-equipped Quantum-2 or Spectrum-4 switches and QSFP56-based ConnectX or BlueField devices.
FAQ
- How does O400-2Q-HDR-C map the 400G OSFP connection to its two 200G QSFP56 branches?
It creates two independent 200G HDR branches. Each QSFP56 branch carries four 50G PAM4 channels, while the eight channels at the finned-top OSFP end provide a combined data rate of 400Gb/s.
- How do the supported cable lengths differ between O400-2Q-HDR-C and O400-2Q-HDR-A?
O400-2Q-HDR-C is available from 1m to 2m as a passive copper cable. O400-2Q-HDR-A uses active optical transmission and covers lengths from 1m to 50m.
- Can the two QSFP56 ends of O400-2Q-HDR-A connect to separate 200G HDR devices?
Yes. Each QSFP56 end provides an independent 200G connection, allowing the 400G OSFP interface to connect to two separate servers, adapters, DPUs, storage systems, or other devices equipped with compatible 200G QSFP56 ports.
- How are the connector housings arranged on O400-2Q-HDR-C for switch-side and endpoint installation?
It has one finned-top OSFP connector on the 400G side and two flat-top QSFP56 connectors on the 200G branches. The finned OSFP housing is designed for compatible air-cooled switch cages, while the QSFP56 ends fit supported endpoint ports.
- Does O400-2Q-HDR-C contain active signal-processing electronics in its copper data path?
No. O400-2Q-HDR-C is a passive DAC, so its copper data path contains no active signal-processing electronics. This construction supports low-latency, low-power short-distance connections within its specified 1–2m length range.
- Why can O400-2Q-HDR-A cover longer links than O400-2Q-HDR-C?
O400-2Q-HDR-A converts the high-speed electrical signals to active optical transmission, supporting cable lengths from 1m to 50m. O400-2Q-HDR-C carries the signals directly over passive copper and is specified for shorter 1–2m connections.
- Can either O400-2Q-HDR-C or O400-2Q-HDR-A provide 400G on each QSFP56 branch?
No. Each QSFP56 branch operates at 200Gb/s using four 50G PAM4 channels. The two 200G branches together provide the 400Gb/s aggregate capacity of the OSFP connection.
