Nvidia MMA4Z00-NS Manual page 6

Overview
The twin-port transceiver is a key innovation for expanding the 400G NDR In niBand
Quantum-2 and 400GbE Spectrum-4 Ethernet (400G IB/EN) switch capabilities. The line
rate is 400Gb/s for both 400GbE Ethernet and NDR In niBand based on the 100G-PAM4
modulation. The switches use Twin port OSFP cages supporting two transceiver engines
in a single OSFP form-factor plug creating 800Gb/s electrical to the switch and 2x400G
optics using two MPO/-12/APC optical connectors. Both switches use the same Twin port,
2x400G OSFP plugs for transceivers, copper DACs and ACCs, and are only used in
Quantum-2 and Spectrum-4 OSFP air-cooled switches.
Twin-port devices enable several unique con gurations to connect switches, adapters and
DPUs. Switches maintain separate protocols. The MMA4Z00-NS transceiver includes both
In niBand and Ethernet protocols which is activated depending on the switch protocol
the transceiver used.
Twin-port Transceiver Connectivity Scenarios
The twin-ports enable several unique con gurations to connect switches to switches,
ConnectX-7 adapters, and BlueField-3 DPUs.
The Twin port OSFP uses two, 4-channel MPO-12/APC optical connectors with two 4-
channel ber cables. These can link to a single port 400G OSFP or QSFP112 transceivers
used in ConnectX-7 adapters and/or BlueField-3 DPUs.
The electronics, optics and optical connectors are the same for both single port OSFP and
QSFP112. Both ConnectX-7 and BlueField-3 devices can be used with Twin port OSFP
transceivers at the same time with their respective form-factor type.
Twin-port multimode OSFP transceivers remain at 15 Watts for all con gurations
linking OSFP switches, OSFP and QSFP112 adapters, and DPUs simultaneously.
Linking Twin-port transceivers with 1:2 ber splitter cables to 400G transceivers
automatically creates 200Gb/s transceivers by activating only 2-channels and
automatically reduces power consumption in the 400G transceiver from 8 to 5.5
Watts.
Twin-Port transceivers require ordering two bers at speci c lengths required
MMA4Z00-NS 800Gb/s Twin-port OSFP, 2x400Gb/s Multimode 2xSR4, 50m 5