b) If the received optical power is not within specification, measure the
optical power coming from the CSM (CxD) or OPPM.
The difference between the power reading from the CSM (CxD) or OPPM
and the power reading from the end of the cable which plugs into the
module's network receiver is the loss induced by the cable.
c) If the loss induced by this cable is significantly greater than 1 dB, repeat
step (b) with another cable of the same or longer length. If both cables
exhibit losses significantly greater than 1 dB, the mechanism you are
using for measurement may be inducing loss. Verify your measurement
tools and search for a cable that has the desired loss of 1 dB or less.
d) If the cable does not induce significant loss and the power coming into the
network receiver is still not within specification, please contact your ADVA
Optical Networking Technical Services Representative for assistance.
Step 21 The only remaining aspect of the light path is the client transmitter back to the
application. If the optical power emitted by the module's client transmitter is
within the channel module's specification, proceed to Step 22.
If the optical power is significantly below the channel module's specification,
clean the interface. If the optical power remains significantly below
specification, return the module to ADVA Optical Networking for repair.
Step 22 If the power received by the application exceeds the application's
specification, follow these steps:
a) Calculate the difference between the optical power transmitted by the FSP
3000R7 channel module and the power level received by the application.
Usually, there is plenty of margin in the ADVA Optical Networking
specification for patch field loss, with the possible exception of the TDM
module, which only allows for a few dB of loss.
b) If only a few dB of loss is induced by the cable and connections between
the FSP 3000R7 channel module and the application, and this causes the
application to exceed specification, clean the connections between the
application and the FSP 3000R7. If the application continues to exceed
specfication, contact your ADVA Optical Networking Technical Services
Representative for assistance.
c) If the loss induced by the patch field between the FSP 3000R7 channel
module and the application is significantly greater than 2 dB, follow the
light either from the application back to the FSP 3000R7, or from the FSP
3000R7 to the application. In either case, take power measurements at
each patch field until you locate the connection or cable which induces the
undesired loss.
If you cannot locate the faulty connection or cable, contact your ADVA Optical
Networking Technical Services Representative.
58 FSP 3000R7 Maintenance and Troubleshooting Manual - Product Release 16.2 - Document Issue A
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