Hope someone can help me brainstorm this issue:
We've had the line card module in slot 4 fail multiple times over the last few months. By fail, I mean it goes into "other" state and all ports are listed as "errdisable." We've also had the module in slot 5 fail twice with the same symptoms.
We recently had the sup fail along with the line card, so since we had a spare chassis, I swapped that while I was at it in an attempt to eliminate the chassis as a potential culprit.
I've had this issue with both WS-X6148-RJ-21 and WS-X6248A-TEL modules. Cisco has done a site analysis regarding proper grounding etc. and we have since had a contractor perform the grounding per Cisco, so I can't see that as an issue.
Furthermore, we have 9 other chassis throughout our campus with the exact same setup running the same FW/SW revs so I'm not seeing it as a bug as this issue has been isolated to this one location and specific slot(s).
At this point I'm left to think it's something on the physical layer - 25pr telco cables, patch panel - something? Any thoughts would appreciated.