ACC X.25 Protocol User's Guide

Chapter 3 61
ZX25D X.25 Protocol Driver
Implementation Notes
Error Handling
The ZLU error counter for the X.25 link ZLU is incremented whenever
an invalid frame is received, any frame needs to be re-transmitted or a
FRMR (Frame Reject) frame is either t ransmitted or received.
These counters can be viewed via the tt and ttx commands of the ZMNTR
utility.