Nvidia MMA4Z00-NS Manual page 7

Each ber cable can each be di erent lengths. Both bers need to be same type:
both straight or both splitters, and not mixed.
Both bers should be the approximately same length to avoid inducing di erent
latency delays in the bers (4.5ns/meter).
Straight and splitter bers cannot be used at the same time in Twin port OSFP
transceivers.
NVIDIA supplies multimode, crossover, straight ber cables up to 100-meters
straight and 50-meters for splitters that enable linking transceivers directly
together.
All combinations of Twin port 2x400G OSFP, 400G single port OSFP/QSFP112, ConnectX-7
and BlueField-3 contains both In niBand and Ethernet protocols which is activated upon
inserting into an In niBand or Ethernet switch. This enables one set of cables,
transceivers, adapters and DPUs to have multiple uses in a network – especially in DGX
systems where low-latency In niBand switching may be used for GPU-to-GPU networking
and Ethernet switching systems for storage and cluster communication.
The use cases include:
1. Switch-to-switch at 800Gb/s or to two switches at 400Gb/s
2. Switch-to-two combinations of 400G ConnectX-7 BlueField-3
3. Switch-to-four combinations of 200G ConnectX-7 and/or BlueField-3
4. Switch linked to the DGX H100 "Viking" CPU chassis to Cedar-7 complex
1. Switch-to-switch at 800Gb/s or to two switches at 400Gb/s
Two OSFP-based switches can be linked together at 800G (2x400G) using two Twin
port OSFP transceivers and two straight, multimode ber cables (MFP7E10-Nxxx) up
to 50-meters. Also, the two ber cables can be routed to two di erent switches
forming two 400Gb/s links. The extra Twin port OSFP ports can be then routed to
more switches.
MMA4Z00-NS 800Gb/s Twin-port OSFP, 2x400Gb/s Multimode 2xSR4, 50m 6