RJ-11 and RJ-12

[Nyg]

Hi

On another thread regarding networking we got into a discussion on the RJ-11 and RJ-12 connectors, all of my refernce material for A+ (Mainly Sybex) states that they are both 4 pin male with the RJ-11 for Phone connection and the RJ-12 for phone handset connection.

However it appears that others have different definitions, their reference says both conntors are 6 pin male with some stating that the RJ-12 does not really exist.

Can anybody help to clear the situation.

 

[Pyg]

RJ-11
The most common telephone jack is the RJ-11 jack, which can have six conductors but usually is implemented with four. The RJ-11 jack is likely to be the jack that your household or office phones are plugged into from the ordinary "untwisted" wire (sometimes called "gray satin" or "flat wire&quot people are most familiar with. In turn, the jacks connect to the "outside" longer wires known as twisted pair that connect to the telephone company central office or to a private branch exchange (PBX).

(source)

http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci214238,00.html

I'm not sure if the RJ-12 realy exists... but I DO know that if I walk into a Graybar and ask for a box of them they will hand them over.

 

[glister]

RJ-12C and RJ-12W - These jacks are normally associated with one line of a key telephone system. The RJ-12C is surface or flush mounted for use with desk telephone sets while the RJ-12W is for wallmounted telephone sets. Typically, these arrangements are used when registered ancillary equipment must respond to central office or PBX ringing.

A+,N+,S+,L+,I+,HTI+,CET,CST,CNST,CNCT,CFOT,CCNT,ACSP,ISA CCST3

 

[DToolsDesigner]

Just to clarify.....

RJ-11 is a 6P2C connection, in other words: 6 Position, 2 Contact

RJ-12 is a 6P4C connection, in other words: 6 Position, 4 Contact, it does have specific applications for key systems when there are issues of electrical line compatibility with the tip and ring.

RJ-14 is also a 6P4C connection, in other words: 6 Position, 4 Contact

And just for the record...there is no such thing as a RJ-45 in the USOC book, it is a 8P8C connection.

Hope this helps for anyone that is confused.
This is not my opinion, just the facts from the USOC book.