RJ11 v. RJ12

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 Question by Ben Whorton posted 21 Jan 2003
 RJ11 v. RJ12
What is the difference between RJ11 and RJ12 and can you use one in place of the other, ie: are they interchangeable as long as it's consistent throughout the wiring? Thanks in advance!
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 Answer by Dmitri Abaimov posted 28 Jan 2003
Dear Ben,

These are essentially the same jack. RJ11, however, has only 4 positions connected while RJ12 has all 6. As long as your system does not use 6 wires to operate, you should be fine with either one of those.
Usually, analog phone takes a center pair of pins, which works with both connectors.

Sincerely,
Dmitri Abaimov, RCDD

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