User Manual

110
User Manual
TFLF
Fig. 4.7 (a): Flow-chart describing the quick troubleshooting procedure
start
Which red
LED is ON?
RU1, 2, 3 or 4
Replace the faulty TFLF
Clean corresponding SC-APC
optical adapter and connector
Yes
Is any red LED
ON upon the
TFLF?
N
o
No
Go to corresponding
remote unit side
Verify if any external
equipment or dry contact
p
ort has some problems
Refer to the remote unit
dry-contact troubleshooting
No
Yes
Yes
UL optical cables or optical
connections are supposed to
have some problems. Refer to
fibre optic UL troubleshooting
(fig. 4.7b)
No
Refer to remote unit
troubleshooting
Yes
end
Is red LED
upon TFLF
still ON?
Is red LED
upon remote
unit ON?
Is red LED
upon remote
unit still ON?