Ericsson RAN GSM Training

Slide 1

Troubleshooting Common Ericsson GSM Alarms A step by step guide.

Slide 2

Common Ericsson GSM Alarms • MO FLT= OML FAULT • DIGITAL PATH FAULT SUPERVISION • CELL LOGICAL CHANNEL AVAILABILITY SUPERVISION • MO FLT= PERMANENT FAULT • MO FLT= BTS INTERNAL

Slide 3

Common Ericsson GSM Alarms Cont. • EXTERNAL ALARMS; see Additional Info • PWR COMMERCIAL;RECT 24V MAINS;BATTERY • CORRELATED LIKE: MO FLT= TS SYNC FAULT • CELL LOGICAL CHANNELS SEIZURE SUPERVISION • CP AP COMMUNICATION FAULT

Slide 4

Common Ericsson GSM Alarms Cont. • MO FLT= LOOP TEST FAILED • LOCAL MODE & OPERATOR CONDITION

Slide 5

MO FLT= OML FAULT • A fault exists in the communications link between the BSC and the BTS. • Alarm can come in as either Major or Critical. • Can come in on the CF, TRX, or both. • 90% of the time is due to a down or faulty T1. • Can also result from a faulty TRX or loss of communication from the BSC to the TRX.

NOTE: Prior to troubleshooting this or any other Ericsson alarm, always perform a right click on the alarm in Netcool and chose the ―View alarms at this Location‖ option to view all alarms at this site to see if this could be a secondary affect caused by power, maintenance, ECT and always search CTS to see if there is an existing Ticket on the site for this or any related issue.

Slide 6

Recommended Troubleshooting Steps SKCAB07

SCRMCAT021

MO=RXOCF-55 SLOGAN=OML FAULT

1. Log into appropriate Complex/BSC and retrieve an alarm list for the parent RXOTG by running the RXASP:MO=RXOTG-__; for the CF listed.

The TG number will be the same as the CF listed in the alarm.

Slide 7

RXASP:MO=RXOTG-55; Connecting to SKCAB07... (Use 'quit' to logoff)