gistfile1.txt

USB refclock = GPS PPS connected via USB
teensy-X.lan = teensy based NTP servers (with hardware timestamps)

config:
refclock SOCK /var/run/chrony/chrony.ttyACM1.sock refid USB offset 0.000068 poll 3

MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#* USB                           0   3   377     5  -7698ns[-7963ns] +/- 5688ns
^- teensy-1.lan                  1   4   377    17   -609ns[ -609ns] +/-   19us
^- teensy-2.lan                  1   4   377    31   -249ns[ -517ns] +/-   19us
Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
==============================================================================
USB                        21  13   162     -0.000      0.034     -1ns  1395ns
teensy-1.lan               19  11   134     +0.007      0.004    -75ns   160ns
teensy-2.lan               21   8   106     +0.009      0.003   +133ns   113ns
Reference ID    : 55534200 (USB)
Stratum         : 1
Ref time (UTC)  : Fri Aug 04 21:57:30 2023
System time     : 0.000000331 seconds slow of NTP time
Last offset     : -0.000000271 seconds
RMS offset      : 0.000000347 seconds
Frequency       : 27.174 ppm fast
Residual freq   : -0.000 ppm
Skew            : 0.036 ppm
Root delay      : 0.000000001 seconds
Root dispersion : 0.000010352 seconds
Update interval : 8.0 seconds
Leap status     : Normal