isdnsync - use a cheap HFC-S card with the public telephone network as frequency standard for your E1

       This  manual  page was written by Ruben Undheim <ruben.undheim@gmail.com> for the Debian project (and may
       be used by others).

                                                  12 March 2025                                      ISDNSYNC(1)

isdnsync is a small tool that initializes a cheap HFC-S ISDN-Card so that bit and frameclock are  present
       on 2 IC-Pins. These signals can be used to feed HFC-E1 card with a very exact clock.

isdnsync  -  use  a  cheap HFC-S card with the public telephone network as frequency standard for your E1
       line

osmo-bsc(1)

isdnsync <card>