9 Troubleshooting (Fault Finding)
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9.2.2 Some Activity
If there is some activity but the link is unreliable or does not achieve the data rates required
then:
1. Check that the interference has not increased using the i-DFS measurements.
2. If a quieter channel is available check that it is not barred.
3. Check that the path loss is low enough for the communication rates required.
4. Check that the ODU has not become misaligned.
9.3 Lightning Strike
If a link end installation is struck by lightning, perform the following diagnostic procedure:
1. Perform the tests specified in Section 9.1 “Test Link End Hardware”. Ensure that the
PIDU Plus i
s working and that the resistances are correct as specified in 9.1.7 “Test
RJ
45 Resistance”.
2. If the ODU is not working, power off the ODU and both LPUs and return them to
Motorola.
3. If the ODU is working but there is suspicion of damage to the LPU, then take the
LPUs down and take the covers off, inspect for damage, test the big diode for short
circuit and test all other diodes for forward voltage.
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