Last week (entry 50369) we had noticed that the quadrants on the SDB2 bench were not reachable any more. We suspected an issue with the ethernet bridge. We had tried to switch off/on the power supply of the quadrants and of the ethernet switch, but this was not producing any effect.

This morning, we repeated again the same test: we switched off the power supply of the quadrants and of the switch, and then we switched it back on:

2021-01-12-08h51m55-UTC    info gouaty       Disable output of PowerUnit14
2021-01-12-08h52m08-UTC    info gouaty       Disable power for device Switch using PowerUnit11
2021-01-12-08h52m27-UTC    info gouaty       Enable output of PowerUnit14
2021-01-12-08h52m44-UTC    info gouaty       Enable power for device Switch using PowerUnit11

Two minutes later (at 08h54 utc) the communication with the ethernet bridge and the quadrants was restored.

For the time being we do not understand this behaviour (in particular why the switch off/on did not solve the problem last week while it worked this morning). One difference is the temperature which is about 1.5°c larger today with respect to last wednesday (see attached figure), but it seems rather unlikely to be the cause of such misbehaviour.

We will keep monitoring the behaviour of this ethernet bridge.