[cisco-nas] E1 alarm explanation

[Aljaz Tomaz ITWEG]

Hi! 
I'm looking for an explanation about Alarm on E1 interface on our 3600. Here is output
E1 6/0 is up. 
Applique type is Channelized E1 - balanced 
Far End Block Errors Detected <----------------------- ????
No alarms detected. 
alarm-trigger is not set 
Framing is CRC4, Line Code is HDB3, Clock Source is Line. 
Data in current interval (164 seconds elapsed): 
0 Line Code Violations, 0 Path Code Violations 
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs 
Total Data (last 8 15 minute intervals): 
0 Line Code Violations, 0 Path Code Violations, 
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins, 
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs 

What it means 
Far End Block Errors Detected 

Best regards, 
Tomaz