We are attempting to use copper to fiber Black Box transceivers to connect to a remote site (3560). The transceiver can be powered by PoE or an AC adapter. We are attempting to use both, with the AC as a back-up. Is this the best option? or is PoE extremely reliable? If we should have redundant power, are there any commands where the switch would err-disable the port, but then immediately re-establish the port?
The commands you need are:
errdisable detect cause
If you're not running the latest IOS you may need to upgrade, but a quick check of the feature navigator should help with that. (The inline-power cause appeared in 12.2(37)SE for example).