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Powerwave Fiber Optics
VM100 56/EN – User’s Manual Rev. P1A9-Draft 2004-11 8 - 1
8. Troubleshooting
This troubleshooting guide is applicable to a BMU connected to a BTS. The BMU is
also the master unit in a fiber optic network built-up with FON units, one in the BMU
and one in each of the connected repeaters.
This guide assumes that no gateway is available in the repeater network, and that alarms
are indicated via an alarm relay in the BMU.
At the BMU site
1. Inspect the BTS and BMU sites.
If a general inspection of the BTS site does not explain the cause of the error, then
open the cabinet of the BMU.
2. Check the power in the BMU.
This includes the BMU power supply and the fuse in the distribution panel.
If a replacement of the PSU does not solve the problem, then check the power
distribution cable from the PSU to the FON unit.
3. Check the red FAULT and the green FLI/F2F indicators.
If neither the red FAULT indicator in the BMU or the green FLI/F2F indicator are
blinking, then the FON unit is not communicating properly with any of the remote
repeaters.
If there are more than one repeater in the repeater network, then the problem is
most likely related to the fiber at the BMU site, or the fiber cable between the
BMU and the repeaters.
4. Measure the received uplink 1310nm optical power from the repeater at the patch
cables in the BMU.
If the measured optical power is higher than –10dBm, then proceed with step 5.
If there is no optical power, then check the signal power at the patch panel.
5. Measure the optical uplink power at the RX port of the current FON unit.
If the signal power is OK, then proceed with step 6.
If there is no power in the RX port, then clean the connectors and measure again.
If there is still no power in the RX port, then replace the FOU unit with the passive
devices (keep the FON board). The problem is very likely related to a
misfunctioning splitter or WDM.
6. Measure the optical downlink transmitting power at the TX port of the same FON
unit.
If the signal power is not OK, then replace the FON board.