[ntp:questions] Acutime Gold
Mark C. Stephens
marks at non-stop.com.au
Fri Aug 16 01:27:15 UTC 2013
If I have palisade prefer PPS comes up fine within a minute or so.
When I tried making pps prefer it got an x beside the PPS.
I waited for an hour or 2 but it was still marked bad.
Not sure what's going on there..
this is the relevant part of the config:
server 127.127.22.0 minpoll 4 maxpoll 4 # prefer # noselect
fudge 127.127.22.0 flag2 0 flag3 1 flag4 0 # time1 0.000016
# palisade on ttyS0
server 127.127.29.0 minpoll 4 maxpoll 4 prefer
fudge 127.127.29.0 flag2 0 # time1 0.000015
As you can see I have tried different time1 for both clocks.
I am not familiar with the mindist option.
Will go check it out.
I'll wait until the jitter settles down and post the offset.
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Subject: Re: [ntp:questions] Acutime Gold
Mark C. Stephens wrote:
> remote refid st t when poll reach delay offset jitter
> oPPS(0) .PPS. 0 l 4 16 377 0.000 -0.003 0.005
> *GPS_PALISADE(0) .GPS. 0 l 4 16 377 0.000 0.014 0.002
> For the above wouldn't I need to advance PPS by time1 0.003?
I don't think so.
> And retard the palisade by time1 -0.014?
> Assuming these are the average values.
> Because I tried those values and the PPS got marked bad ticker and the
> palisade was unreachable!
AFAIK, the way most people do it, is to have several refclocks / servers, and change to noselect, the one you want to check the serial end of line offset; let it run for a day or two, and take the average.
According to the driver doc,
a serial end of line time1 offset of around 20ms is common.
You might also need to increase the mindist.
You might also want to prefer the PPS.
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