User Manual

60
User Manual
3. Disconnect the optical fibre and clean it better at both ends then clean the
SC-APC ports on both the TFLN and the remote unit. Re-connect the fibre
to relevant ports after cleaning. If it doesn’t made TFLN red LED switch off,
follow next steps.
4. Disconnect the optical SC-APC connector from remote unit DL port, and
measure the output power P
OUT
(DL) at the corresponding fibre end. Then,
go to the TFLN side, disconnect the optical SC-APC connector from TFLN DL
port and measure the input power P
IN
(DL) coming out of the TFLN DL port.
Calculate the DL fibre attenuation A
DL
as A
DL
[dB] = P
IN
(DL) – P
OUT
(DL)
a. If A
DL
> 4dB, then the fibre optic cable has some problems.
Replace it with a new one.
b. If A
DL
< 4dB troubleshooting procedure has not identified the
problem. Refer to supervision system or contact assistance.
TFAx
CaseB
Fig. 3.27 (a): Flow-chart describing the quick troubleshooting procedure on TFAx Case B
start
Is the red LED
ON upon the
TFAx?
No
Yes
Yes
N
o
Verify if any external
equipment or any dry contact
port have some problems.
Refer to dry-contact
troubleshooting (fig. 3.27b)
Clean the SC-APC
optical adapters and
connectors
N
o
Yes
end
Is red LED
upon TFAx still
ON?
Is red LED
upon TFAx still
ON?
Optical cable or optical connections
are supposed to have problems on
DL path. Refer to fibre optic DL
troubleshooting (fig. 3.27c)