I've made over 500 RJ45 crimps, with more or less the same crimper. All at the same company.

At one point I was consistently making bad connections, as well as my coworkers. It took us a long time to figure what the heck our problem was. But comparing the new connections to the old, it became apparent when looking at the sides.



You can clearly see where the jacket of the cat5 can be pushed into and where only the wire can proceed to the pins. Well we were use to the RJ45 connectors that allowed a shorter wire. Then the new connectors came in and it required more of the jacket to be stripped off, but of course we didn't know that. 80% of the time we weren't making connections. But when we did, it was slow.

That was one set of RJ45 we didn't like.

An other set had larger holes. So instead of 22-24 gauge wire. It allowed 16-18, well at least something larger. And we kept on cross crimping wires into different pins. Or crimping 2 wires under one pin.

So if you can, compare the new RJ45 connections to old to see if you see any differences and adjust as needed.

KOT