Flexi Multiradio Base Station alarm reclassificationFlexi Multiradio Base Station alarm reclassificationFlexi Multiradio Base Station alarm reclassificationFlexi Multiradio Base Station alarm reclassification In fault situations, Flexi Multiradio Base Station runs an automatic reclassification procedure for major and critical alarms before it sends an alarm to the BSC. When an object becomes faulty, only one critical alarm from a BCF/BTS object or only one major alarm from a faulty TRX can be active at a time. In reclassification, the alarm handling detects which logical base station object is affected by a module level fault. After reclassification, only one object level alarm with only one fault reason is sent to the BSC. However, the same alarm can be caused by several different fault reasons.

Fault situation 1: Fault situation 1: Fault situation 1: Fault situation 1:

Fault situation 2:Fault situation 2:Fault situation 2:Fault situation 2:

Figure 7: Faulty and degraded object alarm reclassification

1. TRX 1 becomes faulty and ceases to operate. 7606 TRX FAULTY alarm is issued.

1. TRX 1 becomes faulty and ceases to operate. 7606 TRX FAULTY alarm is issued. 2. TRX 2 becomes faulty and ceases to operate. 3. Now both TRXs are not operating, which causes BTS 1 cease to operate. A BTS alarm, 7603 BTS FAULTY, is issued.

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Fault situation 3:Fault situation 3:Fault situation 3:Fault situation 3:

Fault situation 4:Fault situation 4:Fault situation 4:Fault situation 4:

When the TRX-2 becomes faulty, it raises a BTS object level alarm and not a 7606 TRX ALARM. Similarly for example, in a situation with 12 TRXs per BTS and all 12 TRXs going faulty, the 12th TRX that goes faulty raises a BTS object level alarm.

1. TRX 1 becomes faulty and ceases to operate. 7606 TRX FAULTY alarm is issued. 2. The performance of TRX 2 becomes degraded but calls are still possible with it. 3. Now the sector is partially faulty, and a BTS alarm, 7604 BTS OPERATION DEGRADED, is issued.

1. TRX 1 becomes partially faulty but calls are getting through. 7607 TRX DEGRADED alarm is issued. 2. TRX 2 becomes faulty and ceases to operate. 7606 TRX FAULTY alarm is issued for TRX 2. 7607 TRX DEGRADED alarm is cancelled

for TRX 1. 3. Now the sector is partially faulty and a BTS alarm, 7604 BTS OPERATION DEGRADED, is issued.

Id: 0900d8058085dc2c ©2012 Nokia Siemens NetworksDN0947076

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