Problem migrating from legacy to ntpsec

[Jim Pennino]

I have a precision time and frequency device that provides, among other things, a serial port outputting NMEA data and pps with a specified accuracy of +/- 1 ns.
This has been working just fine for many years.
After an upgrade to Ubuntu 24.04.1 I found legacy ntp had been replaced by ntpsec-1.2.2 and the reference clock no longer works. The output of ntpq -pn is:
xNMEA(0)           .PPS.            0 l    -   16  377   0.0000 -96.9056   0.5170
+192.168.0.100   .PPS.           1 u   24 1024  377   0.1328  -0.8315   0.7548
*192.168.0.101    .PPS.           1 u  332 1024  377   0.1171  -0.8703   0.8439
+192.168.0.21     .PPS.           1 u  137 1024  377   0.1565   1.5477   0.7258

The relevant lines from ntp.conf are:
server 127.127.20.0 mode 16 minpoll 4 iburst
fudge 127.127.20.0 time1 -0.0007 flag1 1 flag2 0 flag3 1 refid PPS

In going through the documentation I found that it says the 127.127.x.y is replaced by a new symbol notation but is still recognized, so that should not be an issue. I did not find anything else that needs to be changed other than the location of the statistics files which I process to provide graphic status, but I may have missed something.
So, can anyone tell me what I need to do here to get it working again with ntpsec?
Also, is it a true statement that all I have to do to change to the new naming scheme is to change 127.127.20.0 to nmea?





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