If there is a power gain over the CLSM, channels in another group/band
may be transmitting optical power through the system. Ensure only one
channel is present when measuring loss over the CLSM.
Step 10 Use the measurements you have already taken to check the loss over the
OSFM (Optical Supervisory Channel Filter Module). If no OSFM is installed,
please proceed to Step 11.
If multiple channels are running over the system, and only one channel exhibits
power levels which are not in specification, please proceed to Step 11, since
the OSFM is probably not the root cause,
a) If the loss from the CLSM N/M interface to the OSFM N/M interface is
within the limits indicated in the
Module and System Specification
, then
this OSFM is functioning properly.
b) If the loss across the OSFM is too high, despite all attempts to clean its
interfaces, return it to ADVA Optical Networking for repair.
If there is a power gain over the OSFM, channels in another group/band or
the 1630nm Optical Supervisory Channel coming from the OSCM may be
transmitting optical power through the system. Ensure only one channel is
present when measuring loss over the OSFM. Disconnect the OSCM from
the OSFM.
Step 11 Use the measurements you have already taken to check the loss over the
RSM (Remote Switch Module) or VSM (Versatile Switch Module). If an RSM
or VSM is not present, proceed to Step 12.
In this case, we need to determine how much light is lost over both line NW
and line NE paths. If the loss from going into the network link is within the
limits indicated in the
Module and System Specification
, proceed to the next
step. If the loss exceeds the limits, the RSM or VSM may be defective.
Step 12 Network Link. If the loss on the network link is within the limits specified in the
Module and System Specification
for the given configuration, proceed to Step
13. Please note that you need to check each fiber used on the network link.
If the loss on the network link is too high, clean the interfaces into the network
link. If the loss still exceeds the allowed range, contact the service provider
who supplied the link.
Step 13 Network side of the network link. If an RSM or VSM is not present, please
proceed to Step 14.
a) If you have not already done so, measure the optical power coming into the
RSM or VSM on both NW and NE links, and the loss through the RSM or
VSMwhen on a selected link.
b) If the loss through the incoming side of the RSM or VSM exceeds the
limits specified in the
Module and System Specification
, even after all
attempts to clean its interfaces, return it to ADVA Optical Networking for
repair.
Note
The lack of direct synchronization of VSMswitch positions may, in rare
cases, lead to transversed switch positions. This is rectified by
performing a manual switch on one of the VSMs to re-align the switch
positions.
Step 14 If an OSFM is not present, proceed to Step 15.
a) If you have not already done so, measure the loss through the OSFM on
the incoming patch which is experiencing problems.
56 FSP 3000R7 Maintenance and Troubleshooting Manual - Product Release 16.2 - Document Issue A
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