Andrew Wireless Innovations Group BCP-TFAM26 User Manual
TFLN troubleshooting
In case a TFLN local unit has any problem, this will be easily revealed through LEDs on TFLN front
panels.
Troubleshooting procedure can be easy when failure detection is directly carried out through LMT or
supervision system, as an alternative, a manual troubleshooting procedure can be carried out.
LEDs panel on TFLN front detect not only failures inside the TFLN, but they also reveals malfunctions
located on related remote unit.
The following table reports a brief description of the TFLN alarms, together with a reference to the
corresponding alerted LEDs:
panels.
Troubleshooting procedure can be easy when failure detection is directly carried out through LMT or
supervision system, as an alternative, a manual troubleshooting procedure can be carried out.
LEDs panel on TFLN front detect not only failures inside the TFLN, but they also reveals malfunctions
located on related remote unit.
The following table reports a brief description of the TFLN alarms, together with a reference to the
corresponding alerted LEDs:
Tab. 12: TFLN LEDs description
As the table shows, LEDs on the TFLN front panel signal all high priority alarms while minor alarms,
which detect critical situations which should be checked and tested in order to avoid future possible
system faults, are only revealed by LMT or supervision system.
Each TFLN is provided with an AGC system which compensates optical losses < 3 dB. TFLN LED
alarms switch on when the estimated optical losses are > 4dB, the AGC not being able to compensate
these losses any more.
One of LEDs 1,2,3,4 might turn on not only to indicate a high optical loss detected by TFLN, but also to
reveal a remote unit failure. Understanding the reason why one of LEDs 1,2,3 or 4 is on (a remote unit
failure, an optical cable fault or an external equipment malfunction) can be done following the
troubleshooting procedure reported hereinafter.
Alarm description
Alerted
LED
Alarm
priority level
The optical power received on UL port 1 is too low and the AGC can
no more compensate the optical losses on UL port 1
no more compensate the optical losses on UL port 1
1
High
The optical power received on UL port 2 is too low and the AGC can
no more compensate the optical losses on UL port 2
no more compensate the optical losses on UL port 2
2
High
The optical power received on UL port 3 is too low and the AGC can
no more compensate the optical losses on UL port 3
no more compensate the optical losses on UL port 3
3
High
The optical power received on UL port 4 is too low and the AGC can
no more compensate the optical losses on UL port 4
no more compensate the optical losses on UL port 4
4
High
The optical power received on UL port 1,2,3, or 4 is near to critical level
but AGC still works
but AGC still works
none
Low
High priority alarm on Remote Unit 1
1
High
High priority alarm on Remote Unit 2
2
High
High priority alarm on Remote Unit 3
3
High
High priority alarm on Remote Unit 4
4
High
Low priority alarm on Remote Units 1, 2, 3 or 4
none
Low
TFLN laser failure
┌┘
High
UL RF amplifier failure
┌┘
High
DL RF amplifier failure
┌┘
High
Short circuit on TFLN module
┌┘
High
Overtemperature on TFLN board
1
none
Low
1
Remember that proper TFLN environmental temperature is between +5°C and +40°C
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