Andrew ION-B Series, Руководство пользователя

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95 MN024-010
TFAM
Case F
start
end
Is the red LED
ON upon the TFAH?
Optical cable or optical
connections are supposed
to have problems on DL
path. Refer to fibre optic DL
troubleshooting (fig.3.16c)
Clean the SC - APC
optical adapters
and connectors
troubleshooting
Is the red LED
ON upon the TFAH?
Yes
Yes
No
No
Quick troubleshooting procedure
(The following procedure is summarized by the fl ow-chart in fi g. 3.6.6a)
In case the red LED is ON, please follow these steps:
1. First of all, clean the optical adapters
2. If the problem still persists, refer to the fi bre optic DL troubleshooting to check if optical
cables or optical connections have any problem on DL path.
3. If previous actions didn’t make the LED switch off replace the unit with a new one or
contact for assistance.
Fibre optic DL troubleshooting
(The following procedure is summarized by the fl ow-chart in fi g. 3.6.6b)
1. Check if there is any point where fi bre experiences a short radius of curvature. In this
case, rearrange the optical path in order to avoid sharp bends (if necessary, replace the
Figure 3.6.6 (a): Flow chart describing the quick troubleshooting procedure for the Case F Remote Unit
Fig. 3.5.6:
AGC thresholds vs LED alerts
0dBm
-3.5dBm
-4.5dBm
Normal
Warning
Alarm
levels.
The red LED switches on when the estimated optical losses are >4.5
dB, the AGC not being able to compensate these losses any more.
As shown in the previous table, the same red LED switches on to
reveal any major failure. Following the troubleshooting procedure
reported hereinafter it is possible to better understand what
problem occurred.