Andrew ION-B Series, User Manual

Page: 59 / 181

59 MN024-010
TFAM
Case B
As shown in the previous table, the same red LED switches on to reveal any major failures. By
following the next troubleshooting procedure, it will be possible to better understand what
problem has occurred.
Note:
Each Remote Unit is provided with an AGC system which kicks in after the optical-to-RF
conversion. This AGC can correctly compensate for optical losses when they are estimated to
be <3.5 dB. In case optical losses are > 3.5dB, the LMT application and the ION-B supervision
unit will display a “Warning” alarm: the whole system still work, but AGC is near to its borderline
levels.
The red LED switches on when the estimated optical losses are >4.5, because the AGC is not
able to compensate for these losses anymore.
start
end
Is the red LED
ON upon the TFAx?
Is the red LED
ON upon the TFAx?
Verify if any external equip-
ment or any dry contact port
have some problems.
Refer to dry-contact trouble-
shooting (fig.3.16b)
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 TFAx?
Yes
Yes
Yes
No
No
No
Figure 3.3.14 (a): Flow-chart describing the quick troubleshooting procedure of a TFAx Case B