Alarm 7745 Nokia

[bentoel]

hi guys..

I need help. I got so many alarm 7745 in my network. It makes my network really bad.
Please give some advise to overcome this alarm.

Thanks you very much.

[OptimiNSN]

Meaning

The rate of calls terminating in failure on a channel is above the
threshold value set by the operator. The alarm is used to supervise
the functioning of traffic and signaling channels, and to detect
the possible faulty channels.
Supplementary information fields
1 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: below threshold (no alarm)
01: above threshold (alarm)

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

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

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

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

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

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

9 indicates if the channel failure rate is above the defined
threshold in time slot 7
00: below 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
period
Instructions
Find out the reason for the alarm on the basis of the release causes
in channel release messages. Restore the channel by first locking it
out of use and then unlocking it with the MML command ERS.

ZERS:<BTS>,<TRX>,<CH>:L; lock
ZERS:<BTS>,<TRX>,<CH>: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)
Cancelling
If the alarm requires no user actions, you can cancel it with the
MML command EOR.

The system cancels the alarm automatically in connection with the
user's locking and unlocking commands, or, if the situation is solved
without user actions, after the current measurement period.

All supplementary fields except CFR_OBJ field are set to zero
irespective of the alarms cancelled manually or by the system.


This is the basics
In practice

If you get all 1s in Option 2 to 9 is one indication that the TRX is out of combat.
If you see almost all 1s in Option 2 to 9 indicates low quality of TRX.
If they are all TRXs of a sector may be interference.
If there are few 1s is nothing for you to be alarmed.

[harrypotter]

Meaning

The rate of calls terminating in failure on a channel is above the
threshold value set by the operator. The alarm is used to supervise
the functioning of traffic and signaling channels, and to detect
the possible faulty channels.
Supplementary information fields
1 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: below threshold (no alarm)
01: above threshold (alarm)

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

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

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

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

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

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

9 indicates if the channel failure rate is above the defined
threshold in time slot 7
00: below 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
period
Instructions
Find out the reason for the alarm on the basis of the release causes
in channel release messages. Restore the channel by first locking it
out of use and then unlocking it with the MML command ERS.

ZERS:<BTS>,<TRX>,<CH>:L; lock
ZERS:<BTS>,<TRX>,<CH>: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)
Cancelling
If the alarm requires no user actions, you can cancel it with the
MML command EOR.

The system cancels the alarm automatically in connection with the
user's locking and unlocking commands, or, if the situation is solved
without user actions, after the current measurement period.

All supplementary fields except CFR_OBJ field are set to zero
irespective of the alarms cancelled manually or by the system.


This is the basics
In practice

If you get all 1s in Option 2 to 9 is one indication that the TRX is out of combat.
If you see almost all 1s in Option 2 to 9 indicates low quality of TRX.
If they are all TRXs of a sector may be interference.
If there are few 1s is nothing for you to be alarmed.


Optimi.. is this alarm doesnt pertain to any hardware issue, antenna or line issue?

[riyantoyadi]

Yes, this alarm to explain some performance degradation

1. Overshooting
2. HO Fail
3. Drop Call
4. Call Setup
5. HW problem

ex : 7745 with 7744 mean Interference
7745 with 7602 some problem on your RF part

[OptimiNSN]

I recommend you read this training http://www.finetopix.com/nokiasiemens/18117-nsn-2granop-solution-findings.html
In this training you will find the answers