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Chapter 4 Troubleshooting and Diagnostics IPmux-1/1E Installation and Operation Manual
4-10 Performance Monitoring and Troubleshooting Statistics
Table 4-3. E1/T1 Alarms (Cont.)
Alarm Description
FEBE A Far End Block Error is sent to transmitting device notifying that a flawed block has been detected at the receiving device. Exists only for E1 MF-CRC4.
The FEBE counter will increase by one for each second during which the FEBE indication is received.
Recommendation:
Check physical link integrity.
BES A Bursty Errored Seconds (also known as Errored second type B) is a second during which fewer than 319 and more than one CRC errors occurred with
neither AIS nor SEF (Severely Errored Frame) detected. The BES counter will increase by one for each second containing the condition described above. The
CRC is calculated for the previous frame in order to prevent processing delay.
Complies with AT&T TR-62411 and TR-54016 standards.
Not applicable if the line type is set to Unframed.
Available only at T1-ESF or E1-CRC4 modes (performance monitoring functionality).
Recommendations:
Check physical link integrity, G.704 frame format integrity and Sync. (The CRC bits are included in TS0 for E1 multi-frame links and in the frame alignment
bits for T1 ESF links).
DM A Degraded Minute is calculated by collecting all the available seconds, subtracting any SES and sorting the result in 60-second groups.
The DM counter will increase by one for each 60-second group in which the cumulative errors during the 60-second interval exceed 1E-6.
Available in T1-ESF or E1-CRC4 modes only, (performance monitoring functionality).
Recommendations:
See BES recommendations.
ES An Errored Second is a second containing one or more of the following:
CRC error
SEF (OOF)
AIS (T1 only)
If SES is active ES runs for 10 seconds and then stops.
Recommendations:
Check physical link integrity. Follow the recommendation concerning LOF, BEF and AIS.