Why do working equipped MX2820 Access Modules display as blank or unknown when existing service is up and working.
This is a backplane communications bus issue that doesn’t affect working service. This a known condition that typically manifests itself when the last two mated slots are equipped with Access Modules
The resolution is to update the SCU Module’s software to F05. We also recommend updating the Access Module’s software to the latest released software as well.
If software update doesn’t resolve the issue, it’s possible one or more Access Modules are causing the condition aka “Killer Unit”.