Specifications
Installation and Operation Manual Chapter 6 Diagnostics and Troubleshooting
IPmux-24 Ver. 1.5 Monitoring Performance 6-5
Alarm Description
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.
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.
Recommendations:
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.
Recommendations:
See above recommendations.
LOMF Number of seconds of Loss of Multi Frame. A Loss of Multi Frame indicates a second with no
sync on the multi frame mode, i.e., the receiving device is unable to detect the four ABCD
bits pattern on. The LOMF alarm is also indicated by the front panel ALM LED (red). TS16
MSB in frame 0 for two consecutive multiframes. Available only for E1 multiframe mode
(CAS).
Recommendations:
Check physical link integrity, signaling method (CAS enable only), and framing-related
parameters.