This is in lieu of a post I wanted to write, but haven't had time for.

Primary phone line:
blue & white (twisted)
or
red & green (old style)

Modular connectors:
Phone jacks; space for 6 wires:
RJ11 = 2 wires (1 line) = 6P2C (6 position, 2 contacts)
RJ14 = 4 wires (2 lines) = 6P4C
RJ25 = 6 wires (3 lines) = 6P6C
4P4C = smaller plug for phone handset

Ethernet; 8 wires:
RJ45 = 8P8C
CAT5 = ethernet cable (8 pins). Normally only 4 of the 8 wires are used.
CAT5e & CAT6 = also ethernet cable; supports faster speeds.
"gigabit" ethernet - uses all 8 wires.

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djinncoyote

September 2017

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