Due to some recent construction, we had to re-route some fiber. This is a 400ft section of 6-strand single mode. We have an HP 5400 with J9151A transceivers on each end. I have tried multiple known good transceivers and patch cables on each end. The other transceivers in both switches are working correctly. I have swapped transceivers to different ports in the module. The new fiber tests good with a meter. I've updated both switches to the latest firmware. The switch detects the transceiver hot swap according to the event log, but it never lights up once the LC connector is inserted. I have also reversed polarity on the SC connectors at the fiber patch panel. What am I missing here?
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