🚀 go-pugleaf

"Rod Speed" <rod_speed@yahoo.com> wrote in message
news:ab17gr$eaf7v$1@ID-69072.news.dfncis.de...
>
> Nick Andrew <nick@zeta.org.au> wrote in message
> news:ab0cpr$ne1$1@godzilla.zeta.org.au...
> > Rod Speed <rod_speed@yahoo.com> writes
>
> >> Fraid not. RJ11 usually called 6P4C, 6 positions, 4 conductors.
> >> RJ12 is 6P6C, all 6 pins with wires connected to them.
>
> > I think you're right here (after I did a google search...).
>
> Yeah, the RJ numbering system is yet another example of something
> thats completely outgrown its origins and the number itself leaves a
> hell of a lot to be desired now. Thats why the 6P4C style system is
> used now, much more useful. With RJ11 and RJ45 still used to
> loosely describe 6 wide and 8 wide physical bodys.

In the 1970's, AT&T and the FCC developed a system called USOC (Universal
System Ordering Codes) which was/is a set of wiring specifications for
terminating telephone lines.  The USOC system uses RJ (Registered Jack)
numbers to specify the WIRING of a jack/plug, not the actual jack type.
Telecom Australia (now Telstra) developed a similar system (Specification
1222) of various MODES which refered to the WIRING of either 610 telephone
sockets or 611 auxillary equipment sockets.

Through common misuse, the RJ numbers became defacto names for the various
US modular plug variants.  For example, using an RJ number to describe an
actual plug variant is often confusing because different people use RJ11 to
describe 4P4C, 6P2C and 6P4C plugs... none are correct!

Same problem with Australian sockets, the 611 socket is often incorrectly
refered to as a MODE-3 socket.

BR/Dave
drscott@accesscomms.com.au
www.accesscomms.com.au