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Can not create cross connections for odd channels in OSN 6800 in certain amplifiers

Publication Date:  2012-07-25 Views:  96 Downloads:  0
Issue Description
In OSN 6800 system for 80 channels when ITL addition was performed on live network, odd channel cross connections could not be made for passthrough channels (Single station cross connections).
Cross connections for even channels could be made from single station cross connection option,we were not able to select odd channels for amplifier to amplifier cross connections.

Earlier the system was a 40 channel system and by ading ITL it was converted to a 80 channel system.
Alarm Information
There was no particular alarm, except odd frequencies were not shown in the channel selection option only even channels were shown. rest of the system was found to be working OK.
Handling Process

1. Delete all cross connections for the particuar amplifiers 
2. Delete all internal fiber connections for that particular amplifier.
3. Change the mode of all amplifiers to "all"
4. Recreate all internal fibers
5. Recreate all cross connections

If traffic is running on these amplifiers , all passthrough traffic for that concered amplifier will be affected.


Root Cause
After analysis it was found that some amplifiers were working in "even" mode and some amplifiers were working in "odd" mode.
We could not change the mode of this amplifier to "all".
This was the reason odd cross connections could not be created
During new build phase, need to ensure all apmlifiers are configured in "all" working mode instead of even or odd.