I've read that while an RJ45 will work, an RJ48C should be used for a PRI coming from smart jack into a Cisco vwic. Today a customer has the PRI connected to a pbx. I looked at the face plate and I can't tell if it's an rj48 or rj45. Their cabling guy said it's just an rj45 cable from faceplate to their pbx.
So what will happen if I go to use the correct RJ48 when I remove PRI from PBX? Will it work for sure, or is it likely that the smartjack is RJ45 and thus the RJ48 will not work? Is the correct thing to do is to have the faceplate removed and replaced with an rj48c?
Any and all advise is appreciated.
What they're saying is that a RJ45 male fits any jack.
Beside, many smartjacks are NOT keyed anyway.
In fact, original cisco PRI cables have no key.
So you're OK with regular RJ45 connectors to make a custom made cable. If possible, use proper 100 Ohm T1 cable, especially if the patch is longish.