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Fault occurred in RCU motor affecting services relating to Remote Electrical Tilt.

Publication Date:  2019-07-09 Views:  558 Downloads:  0

Issue Description

1. When we calibrate RCU motor of all the sectors, antenna motor fault occurs in the process.
2. It takes time for RCU motor to calibrate than usual. Normally, it takes 1-2 minutes to calibrate all sectors (900+1800) or 2100.

Alarm Information

1. RET antenna running data and configuration mismatch.
It will occur when you configure some parameter which conflicts with existing equipment.
2. Antenna motor fault.
It occurs when RCU motor cannot calibrate to desired tilt required or asked to calibrate more than its maximum value.

Handling Process

The solution for the problem is to verify from the site engineers or the database which antenna type is installed in BTS.Once installed antenna type is verified, you must load that antenna type with the following command in MML:
Site ID and device number vary according to your need.DEVICENO is different sectors of BTS.

Root Cause

The cause for the alarms resulting in the failure of RET calibration was due to the loading of configuration script of different antenna type. The installed antenna type in the BTS and the antenna type we load in MML command in M2000 didn’t match. For Example: if the installed antenna type is DBXLH-6565B-VTM and you load antenna type of DBXLH-6565A-VTM in the script, the problem occurs. This is because antenna ‘A’ type has maximum tilt of 15 whereas antenna ‘B’ type has maximum tilt of 10.By loading the different antenna type command we asking motor to calibrate up to tilt 15 whereas the actual value it can calibrate is 10 only. Also that all RCU motor faults is not due to this cause. It may be due to actual motor fault in the site. 


1. Try to verify every detail before configuring script.
2. Every motor fault should not be confused with actual problem in the RCU motor. Antenna mismatch has an impact on the alarm.