Andrew ION-B Series, User Manual

Page: 86 / 181

86 ION-B User Manual
TFAM
Case R2
case, rearrange the optical path in order to avoid sharp bends (if necessary, replace the
optical cable with a longer one). If TFLN red LED switches off, troubleshooting has been
successfully carried out. Otherwise, follow next steps.
2. Check if SC-APC connectors are properly installed at both fi bre ends. In case they are
not, fi x better SC-SPC connectors to adapters. If TFLN red LED switches off, troubleshooting
has been successful. Otherwise, follow next steps.
3. Disconnect the optical fi bre and clean it better at both ends then clean the SC-APC
ports on both the TFLN and the Remote Unit. Re-connect the fi bre 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 fi bre 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 fi bre attenuation A
DL
as
A
DL
[dB] = P
IN
(DL) – P
OUT
(DL)
a. If A
DL
> 4dB, then the fi bre optic cable has some problems. Replace it with a new
one.
b. If A
DL
< 4dB troubleshooting procedure has not identifi ed the problem. Refer to
Supervision System or contact assistance.