User's Manual

59MN024-010

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

Figure 3.3.14 (a): Flow-chart describing the quick troubleshooting procedure of a TFAx Case B