Ethernet link drops temporarily when +8V comes on #34

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sb10q · 2024-02-10T19:08:50+08:00

sb10q commented

2024-02-10 19:08:50 +08:00

Using PoE. May be related to/same as #33

Using PoE. May be related to/same as https://git.m-labs.hk/sinara-hw/kirdy/issues/33

sb10q changed title from E to Ethernet link drops temporarily when +8V comes on

2024-02-10 19:09:04 +08:00

linuswck commented

2024-07-05 12:48:46 +08:00

I cannot reproduce this issue on the current revision of firmware.
This should have been resolved with the soft start implemented on the laser diode output current.

I cannot reproduce this issue on the current revision of firmware. This should have been resolved with the soft start implemented on the laser diode output current.

sb10q commented

2024-07-07 14:41:44 +08:00

This should have been resolved with the soft start implemented on the laser diode output current.

Why?
I don't think the softstart has anything to do with +8V bring-up. Isn't the procedure (1) bring up +8V, and then (2) sweep through the DAC codes to ramp up current slowly?
And iirc the problem is also there with the laser diode turned off. May need the small switch to reproduce.

> This should have been resolved with the soft start implemented on the laser diode output current. Why? I don't think the softstart has anything to do with +8V bring-up. Isn't the procedure (1) bring up +8V, and then (2) sweep through the DAC codes to ramp up current slowly? And iirc the problem is also there with the laser diode turned off. May need the small switch to reproduce.

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Reference: sinara-hw/kirdy#34