Hi @yvesyves,
Our tethers are not guaranteed to meet the official CAT5 specifications, and it’s possible the specification doesn’t even apply underwater (there’s some recent discussion on both those points here). That said, 50 meters is unexpectedly short given within that discussion someone was able to achieve a 100Mbps link with ~80 meters of tether.
This is quite confusing. Generally pinging is the minimum functionality, followed by web interface connectivity (which generally avoid firewall issues), so the fact that pinging and the web interface aren’t working but it’s apparently successfully sending telemetry data is very odd. Out of interest,
- What software are you running on the Onboard (Companion) Computer, and how are you trying to ping it?
- When you used shorter cables, were you using the same command for pinging, and the same address for the web interface?
- Is it possible you’ve changed the IP address of the Onboard and topside computers, and are using an incorrect IP for the web interface / pinging / video configuration?