NSN Alarm Rectification doc

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NSN BTS alarm rectification document

Transcript of NSN Alarm Rectification doc

Troubleshooting with the help of alarm tablesPurposeThe fault reason can be used for troubleshooting. The faults and instructions on how to correct the faults are presented in table format (see example of alarm table below):Table: Description of the fields in the alarm table1234 ALARM NAME

Severity:Object affected:Object state:Unit:

Shows the alarm severity as displayed at the BSC or NMS/NetAct. The options are: * = minor ** = major *** = critical User definitionThe logical object affected by the fault. The options are: BCF, BTS, TRX, TRE, RTSThe state of the affected object at the time the alarm is issued. The options are: Enabled DisabledThe alarm origin(s). The unit is given an acronym, for example: BOI, RTxx, TSxx, BB2x

Fault reason:Instruction:Alarm cancelling:

This field describes the cause of the alarm, for example:Power unit temperature is dangerously high.This field gives instructions for the operator (at the NMS/NetAct or at the BSC) how to correct the fault reason causing the alarm, for example:1. Ensure that the ambient temperature of the base station is within specified limits.2. Check the cabinet fans.3. Replace the faulty power unit(s).This field describes how the alarm is cancelled. The options are: Automatic Manual

NoteWhen baseband hopping is used, alarms do not cancel automatically when a fault is corrected. Sector reset from Nokia BTS Manager or BTS lock/unlock from the BSC is required to clear the active alarms.

NoteIf the fault reason cannot be found in the Fault reason field, the instructions given for Other faults apply for the current fault.

NoteFor instructions on how to replace units, refer to the latest Nokia UltraSite EDGE BTS Product Documentation set.

StepsExpand/collapse all1. Check the alarm number and alarm name and refer to Alarms list for Nokia UltraSite EDGE BTS to find the correct alarm description table.2. Find the fault reason in the Fault reason field in the alarm description table.3. Follow the instructions in the proposed order given in the Instruction field.4. If the fault reason cannot be found in the Fault reason field, follow the instructions given for Other faults.5. If there is no fault reason text with the alarm (see 1. in Figure 'Examples of active alarms as seen at the BSC'), refer to the correct alarm description table and follow the possible instructions given in the Instruction field.

7745 CHANNEL FAILURE RATE ABOVE DEFINED THRESHOLDMeaningThe rate of calls terminating in failure on a channel is above thethreshold value set by the operator. The alarm is used to supervisethe functioning of traffic and signaling channels, and to detectthe possible faulty channels.Supplementary information fields1 indicates if the alarm is on the TCH or on the SDCCH channel 01: TCH 02: SDCCH

2 indicates if the channel failure rate is above the defined threshold in time slot 0 00: belove threshold (no alarm) 01: above threshold (alarm)

3 indicates if the channel failure rate is above the defined threshold in time slot 1 00: belove threshold (no alarm) 01: above threshold (alarm)

4 indicates if the channel failure rate is above the defined threshold in time slot 2 00: belove threshold (no alarm) 01: above threshold (alarm)

5 indicates if the channel failure rate is above the defined threshold in time slot 3 00: belove threshold (no alarm) 01: above threshold (alarm)

6 indicates if the channel failure rate is above the defined threshold in time slot 4 00: belove threshold (no alarm) 01: above threshold (alarm)

7 indicates if the channel failure rate is above the defined threshold in time slot 5 00: belove threshold (no alarm) 01: above threshold (alarm)

8 indicates if the channel failure rate is above the defined threshold in time slot 6 00: belove threshold (no alarm) 01: above threshold (alarm)

9 indicates if the channel failure rate is above the defined threshold in time slot 7 00: belove threshold (no alarm) 01: above threshold (alarm)

10 time slot with the highest failure rate

11 subchannel identification TCH: 00: TCH/H -subchannel 0 01: TCH/H -subchannel 1 02: TCH/F -subchannel

subchannel identification SDCCH: 00 - 07: SDCCH -subchannel 0 - 7

12 proportion of TCH or SDCCH subchannel releases due to failure in all channel releases on a given channel during the measurement periodInstructionsFind out the reason for the alarm on the basis of the release causesin channel release messages. Restore the channel by first locking itout of use and then unlocking it with the MML command ERS.

ZERS:,,:L; lock ZERS:,,:U; unlock

Check that the parameters affecting the alarm are reasonable.MML command EEO outputs the radio network supervision parameter values,EEN command modifies the parameter values.

Parameters, with their default values, affecting the alarm: ZEEN:TCHFR = TCH failure rate (20 %) SCHFR = SDCCH failure rate (80 %) PRDCFR = length of supervision period (60 min) CS = channel seizure threshold value (10)

SMBNT = supervision start time (08-00) EMBNT = supervision end time (18-00)CancellingIf the alarm requires no user actions, you can cancel it with theMML command EOR.

The system cancels the alarm automatically in connection with theuser's locking and unlocking commands, or, if the situation is solvedwithout user actions, after the current measurement period.

7743 MEAN HOLDING TIME BELOW DEFINED THRESHOLDMeaningMean holding time on a channel is below the operator-defined minimumduring the measurement period. The alarm is used to supervise thefunctioning of traffic channels and to detect the possible faultychannels.Supplementary information fields1 indicates if the mean holding time is below the defined threshold in time slot 0 00: above threshold (no alarm) 01: below threshold (alarm)

2 indicates if the mean holding time is below the defined threshold in time slot 1 00: above threshold (no alarm) 01: below threshold (alarm)

3 indicates if the mean holding time is below the defined threshold in time slot 2 00: above threshold (no alarm) 01: below threshold (alarm)

4 indicates if the mean holding time is below the defined threshold in time slot 3 00: above threshold (no alarm) 01: below threshold (alarm)

5 indicates if the mean holding time is below the defined threshold in time slot 4 00: above threshold (no alarm) 01: below threshold (alarm)

6 indicates if the mean holding time is below the defined threshold in time slot 5 00: above threshold (no alarm) 01: below threshold (alarm)

7 indicates if the mean holding time is below the defined threshold in time slot 6 00: above threshold (no alarm) 01: below threshold (alarm)

8 indicates if the mean holding time is below the defined threshold in time slot 7 00: above threshold (no alarm) 01: below threshold (alarm)

9 identifies the time slot where the mean holding time is shortest

10 identifies the subchannel in the time slot with the shortest mean holding time 00: TCH/H subchannel 0 01: TCH/H subchannel 1 02: TCH/F subchannel

11 shortest mean holding time in seconds during the measurement period (TCH)InstructionsFind out the reason for the fault by examining the release causes inchannel release messages. Restore the channel by first locking itout of use and then unlocking it with the MML command ERS.

ZERS:,,:L; lock ZERS:,,:U; unlock

Check that the parameters affecting the alarm are reasonable.The MML command EEO outputs the radio network supervision parametervalues and the EEN command modifies the parameter values.

Parameters, with their default values, affecting the alarm: ZEEN:MINHTT = minimum mean holding time for a TCH (10 s) PRDMHT = length of TCH supervision measurement (120 min) CS = channel seizure threshold value (10)CancellingIf the alarm requires no user actions, you can cancel it with theMML command EOR.

The system cancels the alarm automatically in connection with theuser's locking and unlocking commands, or, if the situation is solvedwithout user actions, after the current measurement period.

7741 MEAN HOLDING TIME ABOVE DEFINED THRESHOLDMeaningThe mean holding time on the channel specified exceeds theoperator-defined threshold during the measurement period.The alarm is used to supervise the functioning of the traffic andsignalling channels. It reveals unreleased calls.Supplementary information fields1 subchannel identification 00 - 01: TCH/H subchannel F0 : TCH/F subchannel C0 - C7: SDCCH subchannel

2 mean holding time on the channel during the measurement period in minutes

3 number of seizures on the channel during the measurement period

4 shortest seizure on the channel during the measurement period in secondsInstructionsFind out whether the channel seizure that caused the alarm is a realcall or an unreleased channel.

Use the service terminal command S:,,B, 2% in the RF part , or BER > 0% in BB part 3) The Rx Result in TRX Test estimates the Rx Level needed by a single receiver for good quality decode of