Standard Operating Procedure – BSR Stopped Issue

Gambar di bawah ini menerangkan proses penanganan masalah jika diketahui BSU Radio Status adalah Stopped:

Prosedur di atas dibuat berdasarkan data dan pengalaman di lapangan.

89 – Code:1 Task SUSP tWCx

The “89 – Code:1 Task SUSP tWCx” is a minor error code and will not affect the system’s performance. This error code refers to a delay in execution of a task; however, once the delay or a single instance is triggered, the error code is reported continuously, regardless of whether the condition is there or not.

 

This error code is not related the SU’s / BSU’s ability to communicate with one another.

To stop the continuing reporting of this error, you can either schedule a reboot of the BSU by using telnet services or console the BSU.

Burst Error Rate (BER)

Burst error rate, BER, is cumulative ratio of burst errors to total number of received bursts in percentage format.

BER Includes:

- Uncorrectable FEC

Uncorrectable FEC (forward error correction) is a condition where valid burst was received and demodulated; however, there were more errors in the burst than could be corrected by the FEC.

High number of uncorrectable FEC caused by:

o low SNR (link is too long),

o multipath fading

o Interference

- No Unique Word

No Unique Word Count indicates that some energy was detected (above the minimum power threshold) during a scheduled time slot, however no Unique Word was detected.

The Unique Word is an identifier that is part of the preamble of every wireless burst and must be valid in order for a burst to be properly demodulated.

No UW on the BSU caused by interference or collisions during contention requests

No UW on the SU caused by Interference or radio too close to base (signal should be less than –45dBm)

- No Energy errors

No energy error is when scheduled packet did not arrive, or arrived with very low power level (below the minimum energy level threshold).

On the BSU: error count increases for each frame that does not have contention traffic. This is a normal condition.

On the SU: Numerous NO ENERGY errors usually indicate a VERY low signal level. SU should be pointed again

BSU in a good condition have an errors < 1-2%. BSU with errors < 5 % is still accepted.

High rate BER indicates interference.

What should we do if we found that BER counter more than 5%?

1. Reset the BSU radio status counter.
2. Step up the Rx power of the BSU (up to -60 dBm).
3. Scan the frequency using the FSA tools that belong to the BSU.
4. Switch the frequency.