Andrew ION-B Series, User Manual

Page: 136 / 181

136 ION-B User Manual
TFLN
start
end
Go to the
TFLN side
The troubleshooting procedure has not identi-
fied the problem. Use the supervision system or
contact assistance
Disconnect the optical
SC-APC connector from
the remote unit DL port.
Is the red LED
upon the remote unit
still ON?
Yes
Yes
Yes
No
No
No
Connect the fibre optic
to its ports again.
Disconnect the
optical fiber and
clean it at both ends.
Is A
DL
>4dB?
Is the red LED
upon the remote unit
still ON??
Are SC-APC
connectors properly
installed at both fiber
ends?
Fix better the SC-APC
connectors.
Clean the optical SC-APC
ports on both the TFLN
and the remote unit.
Measure the output
power at the corre-
sponding fiber ends.
Disconnect the optical
SC-APC connectors from
the TFLN DL ports
Calculate the fiber DL attenuation:
A
DL
[dB]=input power - output power
Measure the input
power coming out
of the TFLN DL port
Fiber optic cable has
some problems.
Please replace it
Rearrange the optical path to avoid
sharp bends. If necessary, replace
the optical cable with a longer one
Is the red LED
upon the remote unit
still ON??
No
Yes
Yes
No
No
Yes
Is there any small
radius of curvature
of the fibre??
power P
OUT
(UL) at the corresponding fi bre 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 fi bre attenuation A
UL
as: A
UL
[dB] = P
IN
(UL) – P
OUT
(UL)
a. If A
UL
> 4dB, the fi bre optic cable has some problems or the cable path is too
long. Replace it.
b. If A
UL
< 4dB, then the TFAx Remote Unit could be faulty. Before replacing it, check
the TFAx status on the Supervision System and contact for assistance
Fig. 4.3.7 (b): Flow-chart describing the quick troubleshooting procedure