atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Cabling Telephones Systems Wiring "RJ" designations?

Doctor:

You are close! The four-line phone configuration (4 lines on a single 8P8C) is RJ61X.

The RJ48 is a demarcation for a T1 circuit and has shorting bars to keep the transmit and receive pairs shorted when nothing is plugged in so as to keep the circuit "alive". These create a loopback condition.

Thanks for the kudos!

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Ed
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How come there's always enough time to go back and fix it a second time?

Yeah thanks was already fully aware of what the P and C stood for. I am a qualified installer was just wondering if they were common in other parts of the world.
What sort of system would use a 4P4C interface cable for programming, a Keysytem? Surely not a PABX.

[This message has been edited by dtu (edited May 31, 2005).]

Same thing with T568A and T568B. The "T" is IMPORTANT! 568B is a written EIA/TIA standard.

OK, Does anyone know what a
10p10 plug and jack is called?
And where can I get one?

REALLY, it's for real.


Corwyn

I know exactly what you are talking about; I have seen them used a lot with cash registers and sometimes with computers. I think your best bet would be from one of those computer hardware catalogs we all get in the mail.

PI Manufacturing in Walnut, CA that has that kind of stuff. Their number is 909-598-3718. It is on page 27 of their spring catalog.

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Ed
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How come there's always enough time to go back and fix it a second time?

I have used the 5 pair jacks your talking about on some Fordstar installs. Jacks and cable were always provided.

This is making my eyes hurt -- let me get a
Kleenex and go to the Frigidaire for a Coke.
If anybody wants, I'll Xerox them a copy of this.

Speaking (or in this case, writing) of mis-designated connectors.. May I introduce the D-sub connector.

This connector is frequently (and incorrectly) called a DB connector.

The correct designations are D[A/B/C/D/E][# pins], where A-E designate the shell size.

Standard sizes include the DA-15, DB-25, DC-37, DD-50, and DE-9, as well as some more specialized versions such as the DB-13W3 (13 pins, 3 coax. used for Sun monitors)

There are many variations to choose from, and the final reference is the ITT/Cannon catalog. (I have a hardcopy from 1970, which agrees with the PDF currently available on the website.)

Thanks tantivy. Some times they only sorce of imformation I can find is catalogs. Every little bit helps.

Tantivy:

You have just enlightened me on a misnomer I have been using for years! I guess the term "DB-9" makes your skin crawl, too!

I never knew that, but now that you have enlightened me, I will sound that much more intelligent when conversing with 24 year old computer "engineers". I am guilty of using the wrong terminology forever when it comes to D-Sub connectors. I shudder to think of the number of people who heard me using the incorrect termiology and just "kept quiet" and talked about me later in private in a chat around the network server. For all I know, they may have had a laugh about me on their own bulletin board/chat room.

I am telling you, these guys have not only developed their own terminology for our industry and theirs, they are forcing it upon us. It's like an X-Files episode.

Guilty as charged here. Line me up against the server room wall and shoot me with RJ12's.


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Ed
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How come there's always enough time to go back and fix it a second time?

[This message has been edited by ev607797 (edited August 29, 2005).]