Specifications

Chapter 6 Troubleshooting and Diagnostics Installation and Operation Manual
6-8 Monitoring IPmux-8/16 Performance IPmux-8/16 Ver. 6.00
Table 6-3. E1/T1 Statistic Parameters (Cont.)
Alarm Description Recommendation
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).
Check physical link integrity,
G.704 frame format integrity
and Sync. (The CRC bits are
included in TS0 for E1
multiframe 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).
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.
Check physical link integrity.
Follow the recommendation
concerning LOF, BEF and AIS.
SES A Severely Errored Second is a second containing one of the following:
• 320 or more CRC errors events
• One or more OOF defect
• One or more AIS events occurred (T1 only)
The SES counter will be cleared after reaching 10 and an UAS will then
be activated.
Check physical link integrity.
See also ES alarm
recommendation.
UAS Unavailable Second parameter refers to the number of seconds during
which the interface is unavailable. The UAS counter will start increasing
after
10 consecutive SES occurrences and will be deactivated as a result of 10
consecutive seconds without SES. After SES clearance the UAS counter
will then diminish 10 seconds from the overall count.
See above recommendations.
LOMF A Loss of Multi Frame indicates there is no sync on the multi frame
mode, i.e., the receiving device is unable to detect the four ABCD bits
pattern on
TS16 MSB in frame 0 for two consecutive multi frames. Available only
for E1 Multi-Frame mode (CAS).
Check physical link integrity,
signaling method (CAS enable
only), and framing-related
parameters.