PTP TAI Query

Chris Hodgetts <[email protected]> Sun, 23 Nov 2025 21:23:05 +1300
Newsgroups gmane.comp.time.chrony.user
Message-ID <[email protected]>
Hello,=20

I have just upgraded to chrony version 4.6.1 on Debian 13=20

I have noticed my PTP time has not failed, and it appears to be when I =
put :=20

refclock PHC /dev/ptp0 poll 0 dpoll 0 tai

If I remove tai - I get 37 second offset and Chrony does not sync to =
PTP.=20

This is my current config=20

# Include additional configuration
confdir /etc/chrony/conf.d
sourcedir /etc/chrony/sources.d
sourcedir /run/chrony-dhcp

# PTP Hardware Clock as main reference
refclock PHC /dev/ptp0 poll 0 dpoll 0 tai

# Public NTP pool + HE.net as fallback
pool pool.ntp.org iburst
server clock.sjc.he.net iburst

# Allow local LAN access (optional)
allow

# Drift file
driftfile /var/lib/chrony/chrony.drift

# Real-time clock sync
rtcsync

# Step on large offsets only at boot
makestep 1 3

# TAI/UTC leap second information
leapsectz right/UTC

# Hardware timestamping
hwtimestamp *

logdir /var/log/chrony
maxupdateskew 100.0

-=20

I know my PTP can only output TAI - and this seems to be a new issue I =
think, as all documentation I can see suggests I am doing things =
correctly =E2=80=A6.

Can any one please suggest what I might try to resolve this?=20

Thanks in advance,=20



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