20083 Remote E1/T1 Alarm (RAI)

Description

An RAI alarm is generated if the E1/T1 port of the BSC receives an RAI signal from the peer NE. The RAI signal is sent to notify the receiving end that the frame synchronization signal cannot be detected or the bit error rate of the signals received by the peer NE is too high.

Attribute

Alarm ID	Alarm Severity	Alarm Type
20083	Major	Fault

Parameters

ID	Name	Meaning
1	Subrack No.	Subrack No.
2	Slot No.	Slot No.
3	Cpu No.	CPU No.
4	Port No.	The number of the port
5	Site No.	The IDs of all sites whose OMLs are on the faulty E1/T1. If BTS are cascade connected,a maximum of 4 sites are shown.Only Abis E1/T1 alarm has this parameter.
6	Site Name	The Names of all sites whose OMLs are on the faulty E1/T1. If BTS are cascade connected,a maximum of 4 sites are shown.Only Abis E1/T1 alarm has this parameter.
7	Alarm Attribute	0=Normal, Alarms period are longer than the Transient Threshold. 1=Transient Count, The times and the period of the alarms whose periods are shorter than the Transient Threshold are summed up. If the sum result is longer than the Alarm Occurrence Period Threshold or Alarm Occurrence Times Threshold, an alarm so called Transient Count Alarm is triggered. Because Transient Count Alarm is based on accumulative result, the recovery of the alarm may occur at least one Summing Cycle later. The Summing Cycle can be query by MML "LST STATSLDWIN".

Impact on the System

If the active board is faulty, the services carried on the port of the board are disrupted.
If the standby board is faulty, the services are not affected.

System Actions

None

Possible Causes

The transmission equipment or transmission link between the BSC and the peer NE is faulty.
The interface board of the peer NE is faulty.

Procedure

Check the transmission between the BSC and the peer NE.
1. Check the type of the board that generates the alarm.
  Y => If the board is an Ater interface board, Go to b. If the board is an Abis interface board, Go to d.
  
  N => The board is of another type. Go to g.
2. Check whether the peer GEIUT that is connected to the board generating the alarm reports the following alarms:
  20081 Loss of E1/T1 Signals (LOS)
  
  20082 Loss of E1/T1 Frames (LOF)
  
  20084 E1/T1 Alarm Indication Signal (AIS)
  
  Y => One of these alarms is reported. Go to c.
  
  N => None of these alarms is reported. Go to 2.
3. Rectify the fault and clear the alarm found in (b) according to the relevant alarm help. Then, check whether the alarm 20083 Remote E1/T1 Alarm (RAI) is cleared.
  Y => The alarm is cleared. The alarm handling is complete.
  
  N => The alarm is not cleared. Go to 2.
4. Query the BTS information according to the alarm location information.
5. Check whether the BTS reports the following alarms:
  4714 E1/T1 Local Alarm or other E1 local alarms
  
  4718 AIS Alarm or other AIS alarms
  
  Y => One of these alarms is reported. Go to f.
  
  N => None of these alarms is reported. Contact Huawei Customer Service Center.
6. Rectify the fault and clear the alarm found in (e) according to the relevant alarm help. Then, check whether the alarm 20083 Remote E1/T1 Alarm (RAI) is cleared.
  Y => The alarm is cleared. The alarm handling is complete.
  
  N => The alarm is not cleared. Contact Huawei Customer Service Center.
7. Contact the maintenance engineers of the peer NE. Check whether the peer NE reports any alarms related to the transmission.
  Y => Rectify the fault according to the relevant alarm help. The alarm handling is complete.
  
  N => Go to 2.
Check the peer NE.
1. Check the type of board that generates the alarm.
  Y => If the board is an Ater interface board, Go to b. If the board is an Abis interface board, Go to e.
  
  N => The board is of another type. Go to i.
2. Perform a physical loopback on the E1/T1 port of the peer GEIUT towards the GEIUT that generates the alarm. Then, check whether the alarm is cleared.
  Y => The alarm is cleared. The peer GEIUT is faulty. Go to c.
  
  N => The alarm is not cleared. The transmission equipment or transmission link between the local and peer GEIUTs is faulty. Contact the transmission engineers. The alarm handling is complete.
3. Remove and then reinstall the peer GEIUT. Then, check whether the alarm is cleared.
  Y => The alarm is cleared. The alarm handling is complete.
  
  N => The alarm is not cleared. Go to d.
4. Replace the peer GEIUT. Then, check whether the alarm is cleared.
  Y => The alarm is cleared. The alarm handling is complete.
  
  N => The alarm is not cleared. Contact Huawei Customer Service Center.
5. Query the BTS information according to the alarm location information.
6. In the BTS, perform a loopback on the E1/T1 port of the E1 lightning protection board towards the BSC. Then, check whether the alarm is cleared.
  Y => The alarm is cleared. The E1 lightning protection board or the TMU in the BTS is faulty. Go to g.
  
  N => The alarm is not cleared. The transmission equipment or transmission link between the BSC and the BTS is faulty. Contact the transmission engineers. The alarm handling is complete.
7. Remove and then reinstall the E1 lightning protection board or the TMU. Then, check whether the alarm is cleared.
  Y => The alarm is cleared. The alarm handling is complete.
  
  N => The alarm is not cleared. Go to h.
8. Replace the E1 lightning protection board or replace the TMU. Then, check whether the alarm is cleared.
  Y => The alarm is cleared. The alarm handling is complete.
  
  N => The alarm is not cleared. Contact Huawei Customer Service Center.
9. Contact the maintenance engineers of the peer NE. On the peer NE side, perform a loopback on the port of the peer NE towards the BSC. Then, check whether the alarm is cleared.
  Y => The alarm is cleared. The interface board of the peer NE is faulty. Contact the maintenance engineers of the peer NE. The alarm handling is complete.
  
  N => The alarm is not cleared. The transmission equipment or transmission link between the BSC and the peer NE is faulty. Contact the transmission engineers. The alarm handling is complete.