Introduced November 2021
The switch has a single Broadcom Trident-4 ASIC with 32 lanes permanently routed
to each of the slots. Each lane can be independently set to 28 or 56 Gb/s. The
lanes can also be run slower (10 Gb/s) if necessary.
The port table from the datasheet is reproduced here:
The four port 400G cards will need 8 56G lanes per port. So 32 lanes for the card. The 16-port QSFP28 card needs 4 28G lanes per port. So 64 lanes for the card. That implies that there must be gearbox ASICs to convert 56G from the ASIC to match the QSFP28 requirements. |