Re: chrony (or I210) loses PHC refclock PPS signal?

It's about 30cm long, with PPS and GND. For GND I used the pin on the 
I210. The cables are simple jumper cables unfortunateley, no shielding.

Am 29.03.2022 um 09:38 schrieb Miroslav Lichvar:
> On Sat, Mar 26, 2022 at 09:59:52PM +0100, Fabian wrote:
>> I think I might have found the problem, but unsure on how to fix that.
>> In the room there is a fluorescent lamp, whenever someone switches on the
>> light, there is a chance the PPS input on the card will stop.
> 
> How long is the cable and is it electrically terminated?
> 
> I have seen the PPS timestamping on I210 to randomly stop working when
> reconnecting between different GPS units. I suspect it happens when
> the hardware gets multiple pulses too close to each other. I can
> reproduce it by configuring the GPS with the CFG-TP5 command to
> generate pulses at a very high rate.
> 
> There seem to be two different failure modes. With one it is sufficient
> to restart chronyd, but the other one requires reloading of the driver.
> I looked at the driver source code for any clues, but didn't see
> anything.
> 

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