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Re: CAX80 Multi-gig ethernet port dropping
I am also having this exact issue. Just with the 2.5g port. The port functions for an undefined period of time then the blue light goes off, the connection stalls, then it drops to 1g. Even on 1g the ...
Possibly inadequate thermal design?
A search of the FCC ID number will bring up the acceptance report containing internal photos. The cable modem and radios will generate some heat and they are under a good sized heatsink. That heatsink does heat the internal air and the radios will also dump some heat into the board.
The ethernet interfaces are fairly high on the board with the 2.5G interface near the top. These IC's do not have heatsinks and are located in the warmest convection air. Increases in temperature generally raise internal resistances and slow signal edges.
I'll propose an experiment for anyone willing:
Elevate a computer fan slightly so it can pull air from below and blow upward.
Set the CAX80 on the fan. Maybe mask the open fan area to the sides of the CAX80 if you feel adventurous.
Turn on wifi and wait to see if the multi gig port can support 2.5GHz.
I may dig through my parts bin to see if I have an appropriate heatsink and test that.