User's Manual

Fiber Optics Powerwave
8 - 2 Rev. P1A9-Draft 2004-11 VM100 56/EN – User’s Manual
At the repeater site
7. Repeat from step 2 to step 6 but now in the repeater.
8. If there are further repeaters in the network, then measure the optical output power
to the next repeater.
If there is no power, then the problem most likely refers to the optic splitter.
Replace the FOU unit with the passive devices (keep the FON board).
A misfunctioning splitter can also be the cause of lost repeaters between the BMU
and the current site.
9. As soon as the optical system works, log on to the repeater and read the RF
information in the event log.
If the error is caused by the RF system, then copy all settings from the current RF
unit into a new RF unit and replace the RF unit.
The quickest way to determine if the RF level is OK in the repeater is to log on to
the repeater and check the RSSI values for the BCCH channel. This value should
be between –40dBm and –50dBm.
If the RSSI value is not between these values and the FON unit works properly,
then measure the RF level from the FOU to the repeater DC coupler using a
sitemaster, spectrum analyser, or similar.
If the loss is 20dB or more, then the LNA amplifier or the DPX filter is
misfunctioning.