You mentioned Ethernet twisted pair. Yup it is different for Ethernet voltage and signal wise.
Found a ring and tip drawing standards using catxx.
A 100BASE-TX transmitter sends three differential voltages, +1 V, 0 V, or −1 V.
1000BASE-T uses all four pairs bi-directionally and the standard includes auto MDI-X; however, implementation is optional. With the way that 1000BASE-T implements signaling, how the cable is wired is immaterial in actual usage. The standard on copper twisted pair is IEEE 802.3ab for Cat 5e UTP, or 4D-PAM5; four dimensions using PAM (pulse amplitude modulation) with five voltages, −2 V, −1 V, 0 V, +1 V, and +2 V. While +2 V to −2 V voltage may appear at the pins of the line driver, the voltage on the cable is nominally +1 V, +0.5 V, 0 V, −0.5 V and −1 V.
Thinking polarity starts to matter more with POE.
House here when built the telephone man ran CatXX cable from the d mark box to the inside around 2001 or so. Guessing telco's just wanted to upgrade their wiring from cat3 that I think they were using back then.
When I was doing the phone thing used an old ma bell telephone with alligator clips on it to test the line in the kitchen; wife laughed when she saw the old phone. This is how I would test prior to know the color coordination of the cat5e. IE: got my OmniPro working this way using 2-3 lines on one wire.
Thinking there is still polarity using an RJ-25. Gee what is the difference then between an RJ-11 and an RJ-12?
Notice that blue is always pair #1.
I used RJ-12's for my 1-wire network way back before going to RJ-45's.
In the 1990's someone gave me a vampire clamp (well they called it that) and I used it as a paperweight on my desk.