Chapter 2
Finding Your Problem - Follow the
Light
This chapter describes how to use the measurements taken to determine the most likely
cause of your problem. It involves following the path of the light as it exits the application
and passes through the FSP 3000R7, for an example 64-channel setup.
Execute the following procedure only if all required power measurements were made
AND you have determined that one or more of the measurements are out of specification.
If all of your measurements are within the limits specified by the application and the FSP
3000R7, proceed to the following chapters in this manual.
Note
Always measure optical power directly at the channel module, not at the
patch panel!
Step 1 If the optical power transmitted by the application is within its specification,
proceed to Step 2. Otherwise, correct the application.
Step 2 If the optical power received at the FSP 3000R7 module's C/R is within the
limits indicated in the
Module and System Specification
, proceed to Step 3.
Please note, however, that you need to take measurements at the FSP
3000R7 module's C/R interface, not at an intermediate patch panel. By not
measuring at the precisely correct point, you risk excluding the cable or
connector that was causing the problem you are now experiencing.
a) If the received optical power is greater than the value allowed for the FSP
3000R7, select an attenuator to reduce the optical power to an acceptable
range.
b) If the received optical power is less than the value allowed for the FSP
3000R7, then you need to determine where the undesired loss is occurring.
If the loss is in the range of 1dB or 2 dB, it is likely that there is little or
nothing that can be done, as inherent connector loss is difficult to reduce
reliably.
If the loss is greater than 2 dB, there may be a sloppy patch connection, a
bad connector, or a bad cable. Trace the power back from the FSP 3000R7
to the application, taking measurements at each possible point. Eventually
you should find a solution.
Unfortunately, if you are unable to locate the point causing the significant
drop, there is nothing that an ADVA Optical Networking Technical
Services Representative can do to help you. This is strictly an in-house
issue.
FSP 3000R7 Maintenance and Troubleshooting Manual - Product Release 16.2 - Document Issue A 53
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