Reference – 197
Problem Solution
12 The noise seen on a trace,
with only a fiber jumper, is
greater than ±0.02 dB.
If noise persists, check the output from the SOM for
low power:
• Measure the power at the SOM output port.
If the power is less than -11 dBm, the power is low.
Measure another port.
If the other port is within specification, take another
reference.
• Acquire another scan.
If the problem is resolved, the source of the noise is
either the UCA or the output port on the SOM. Replace
the UCA and perform the measurements again. If the
problem is caused by the output port of the SOM,
contact the local JDS Uniphase representative or the
service hotline to arrange replacement of the output
cassette.
The correct power at each of the output ports varies
with the number of output ports. The correct power
levels are:
1 output: -5 dBm
2 outputs: -8 dBm
4 outputs: -11 dBm
If not enough power is output by the SOM:
• Measure the power going into the SOM. The correct
power level is ~3 dBm.
Measure the power coming out of the SOM at the
Signal Cond. Out port. The correct power level is
~2 dBm.
If the power levels are not within specification, call
the local JDS Uniphase representative or the
service hotline to arrange repair of the SOM.
If the input power levels are within specification, but
there is no output power, verify that the Signal
Cond. In port and the Signal Cond. Out port are
connected.
(table continued)
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