ADTRAN ISU 512 - Manual (Page 75)

Chapter 6: Testing
61202.086L1-1 ISU 512 User Manual 59
Near-End Block Errors/Far-End Block Errors (NEBE/FEBE)
Allows the user to monitor the quality of the local loop by viewing the number
of near-end block errors (NEBE) and far-end block errors (FEBE) occurring on
the ISDN U-interface. An incrementing count of NEBEs indicates a problem
on the local loop from the switch to the NT-1. An incrementing count of FEBEs
indicates a problem on the local loop from the NT-1 to the switch. A call does
not have to be placed to use the NEBE/FEBE counter.
Since this is a function of the U interface, it only applies to the ISU 512 with U inter-
face.
Software Version
Allows determination of the software version in use on the ISU 512.
Pressing Cancel exits any of these options.