Connection establishment between an end-user machine and TCPaccess X.25 Server may fail persistently with:
Cause 0, Diag 122 (DTE originated/Maintenance action)
Error: address block too short (1)
Q-bit (sometimes spelled Q bit) was implemented on the Cisco Router at end-user end:
X25 map rbp mmmmmmm local port nnnnn q-bit
Note: Q-bit means Qualified Data Bit.
Note: mmmmmmm and nnnnn are specific numeric values defined to the environment.