RJ11-RS232

      RJ11-RJ45










What is what RJ11?
What is what RJ11?

RJ11


The RJ11 standard is used for the phone. It is an international standard that is used to connect the phone to the telecommunications network.
The information transmitted can be digital or analog (DSL).
The telephone cable that usually happens at the Subscriber has 4 twisted pairs : one pair is used.
The two central contacts, 2 and 3, are used to the phone line and the colours help to guide the user. The tension between the two Cables is about 48 volts.
The continuous tension between the 2 connectors RJ11 connections varies from one country to another.
Each country has standardized its phone jacks.

In the United States, the colours of white and blue strands are reversed with the Orange and Brown strands.

Reception and transmission of different connectors RJ11-RJ14-RJ25 functions :



POSITION PIN RJ25 PIN RJ14 PIN RJ11 TWISTED PAIR R/T COLOR TWISTED PAIR COLORS RJ25
1 1 -- PAIR - 3 T WHITE / GREEN WHITE / GREEN
2 2 1 - PAIR - 2 T WHITE / ORANGE WHITE / ORANGE
3 3 2 1 PAIR - 1 R BLUE BLUE / WHITE
4 3 2 - PAIR - 1 T WHITE / BLUE WHITE / BLUE
5 5 4 - PAIR - 2 R ORANGE ORANGE / WHITE
6 6 -- PAIR - 3 R GREEN GREEN / WHITE




Pinout RJ11
Pinout RJ11

RJ11: the \T\


A telephone jack in T uses 8 standard connections, each corresponding to a bit of a different color: gray, white, blue, purple, Brown, yellow, orange.
However, a phone needs only two strands (usually grey and white), the others being mainly used for faxes.

Adapters can be used from one country to another according to the wiring.
The adapter converts and sends voice signals.








RJ11 connection
RJ11 connection

RJ11: standards


Each country has standardized its phone shots.
There are about 44 different variations of catch and standards. In Germany there is the TAE connector.


The RJ standards had many different configurations which have been abbreviated.
The terminology of today is: RJ11, RJ12 or for a plug 6-pin RJ14 and RJ45 for a 8-pole plug