User Manual

109
MN024-08
2. Check if the SC-APC connectors are properly installed at both fibre ends
(i.e. TFLF and TFAx ports). If not fix better SC-SPC connectors to relevant
adapters. If this makes the TFLF LED switch off, troubleshooting has been
successful. Otherwise, follow next steps.
3. Disconnect the optical fibre and clean it at both fibre ends (i.e. TFLF side
and TFAx side) then reconnect the fibre to relevant ports. In case this
makes the TFLF LED switch off, troubleshooting has been successful.
Otherwise, follow next steps.
4. Disconnect the optical SC-APC connector from TFLF UL port, and measure
the output power P
OUT
(UL) at corresponding fibre end. Then, go to the
TFAx side, disconnect the optical SC-APC connector from TFAx UL port
and measure the input power P
IN
(UL) coming out of the TFAx UL port.
5. Calculate the UL fibre attenuation A
UL
as: A
UL
[dB] = P
IN
(UL) – P
OUT
(UL)
a. If A
UL
> 4dB, the fibre optic cable has some problems or cable
path is too long. Replace it.
b. If A
UL
< 4dB, then TFAx remote unit should be faulty. Before
replacing it, contact for assistance
TFLF