PSA: I was crimping my RJ31X jacks wrong for a solid two years

I kept getting intermittent faults on the phone line detection for a bunch of my systems in the Springfield area. A tech from the monitoring center finally asked me to send a picture of my setup, and he pointed out I was using the standard T568B pinout instead of the reversed pair for the alarm loop. I switched to the correct 4C wiring, and the problem vanished. Anyone else have a simple wiring mistake that took way too long to catch?

3 comments

3 Comments

johnson.eva10d ago

Yeah that reversed pair thing got me too, took forever to figure out.

tessalane10d ago

Two whole years with the wrong pinout is actually impressive. You must have had the most patient monitoring center in the business. I can't believe they didn't flag it sooner, given how many systems were acting up. That reversed pair is the entire point of the jack. It's wild that it even worked sometimes.

owens.laura10d ago

Wait, how did it even connect? That's some weird tech magic right there. Two years is crazy long to miss that.

-1