| Re: [chrony-users] chrony (or I210) loses PHC refclock PPS signal? |
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- Subject: Re: [chrony-users] chrony (or I210) loses PHC refclock PPS signal?
- From: Wis Macomson <wis1@xxxxxxxxxxx>
- Date: Tue, 29 Mar 2022 13:27:26 -0700
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Are the two wires twisted together? That might be sufficient.
-wis
> On Mar 29, 2022, at 12:45 AM, Fabian <fabian.schoergi@xxxxxxxxx> wrote:
>
> 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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