BTS Alarm System – NOKIA

BTS alarm system

The BTS alarm system receives alarm indications from the following sources in the radio network:

•BTS equipment alarms

•BTS software alarms

•external alarms from the BTS site

•alarms concerning PCM circuits in the radio network

•alarms from LAPD links in the radio network

•alarms from Abis interface equipment

•alarms from application programs of the BSC

•transmission equipment alarms.

This block diagram illustrates the structure of the BTS alarm system:

 

 

 

 

 

 

Displaying alarms

Alarms are written in a logical file. From the logical file, they can be directed to a local printer or to Nokia NetAct. The table below shows the logical files used with alarms. For further information on the logical files used with alarms, refer to the Logical files directed to terminal devices section of Logical Files.

Table: The logical files used with alarms

Each alarm event, alarm and its cancellation, not filtered by the alarm system, is saved in a log file. This log data is called alarm history. Using the AH command group commands, you can display the history data concerning the system’s alarm situation. For further information on displaying alarm history, refer to Alarm History Handling (AH ) for DX 200 alarms, and Base Transceiver Station Alarms Handling (EO ) for BTS alarms.

You can either display the alarm history, or merely the active alarms, on the selected output device.

The printout format is the same as in alarm printouts.

It is recommended that you print out the active alarms every day. Check if they require maintenance actions.

A DX 200 alarm whose object unit is not in the normal working state is normally filtered by the alarm system. When the alarm is filtered (by any means), it is neither printed out nor stored in the alarm history. However, an alarm that is filtered purely on the basis of the state of its object unit is printed out when displaying active alarms.

You can print out active DX 200 alarms with the command AHO , and active BTS alarms with the command EOL .

You can display the DX 200 alarm history data with the command AHP , and the BTS alarm history data with the command EOH .