Telephone wires FREE cabling and networking Helpdesk
 Question by Grant posted 29 Jan 2004
 Telephone wires
Do the pin positions of the Red/Green Yellow/Black wires in an RJ11 plug have to be the same on both ends when connecting the telephone to the wall jack?
 Answer by Dmitri Abaimov posted 30 Jan 2004

Dear Grant,

The connectors in pairs are crossed in the mounting cord you are talking about. The pair positions though are the same:

Red/Green is pair #1 (the one your first line comes through). Yellow/Black is pair #2 (second line or unused).

So, pin #1 will become #4 on the other end. Pin #2 will become #3, #3 will become #2 and #4 will become #1.

Also, if you use 6-position plug, make sure the conductors did not shift a position to the left or right. The Red/Green pair should be in the very center of the plug.

Dmitri Abaimov, RCDD

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