TheBSGTT | Registered Jack Information

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Friday, November 21, 2008

The Bright Spark's Guide to Telecommunications

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Registered Jack Information

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Here are some graphics on RJ (Registered Jack) Insert Pin-outs that you will most definitely come in contact with every day in telco.
10 BASE T RJ45 EIA/TIA 568A	10 BASE T RJ45 EIA/TIA 568B	It is worth noting here that what is commonly referred to as a RJ45 is really wired to the RJ61C Standard. Don't get hung up on it. RJ45 is fine! The RJ designation depends on how the Insert is wired.
Note: No matter whether a punch-down is EIA TIA 568A or 568B - 10 Base T is on the same pins - only the color code is different. So remember - for a working network link to be established: 568A to 568A 568B to 568B However, if you run out of components then simply reversing the Orange and Green at one end will get you out of a bind.

USOC RJ48C	USOC RJ25	USOC RJ14
USOC RJ11	USOC RJ48X T1/DS1/DSX	USOC RJ48S FRAME RELAY

So how are the Modular Inserts/Jacks used?
USOC RJ11C	Telephone Handset Cord or one voice circuit on a four conductor Telephone Base Cord.
USOC RJ14C	Two voice circuits on a four conductor Telephone Base Cord.
USOC RJ25C	Three voice circuits on a six conductor Telephone Base Cord. Very common on small telephone systems. (Three-Line Phones.)
USOC RJ48	Four voice circuits T1 Voice and/or Data 2-pair connection Frame Relay Voice and/or Data 2-pair connection Switched 56 (2-pair) i.e. to ATM Machines
EIA/TIA RJ61	Goodbye thinwire. Hello Star Network. Enough said.
Note: Voice circuits include: Voice - Modem - Fax - Ringdowns & stuff.

Crimping? A lot of folks don't want to create patch/base/line cords. Something to do with crimping the cable and getting it to test out first time.

Hey, if you can get a handle on it and do it reliably - you can sure save yourself a lot of money. Course, if you're worth $70.00 an hour - hey, buy them off the shelf.

If you're a working stiff like me - then, there's a great little plastic gizmo on the market that allows you to line-up the eight wires in sequence to slot into the plug.

It really makes crimping the connections a snap. If you do run out and buy a crimping tool - make sure it is the eight-conductor version - that way you can do the full spectrum of Modular Plugs.

There is also a fantastic little gizmo from Siemons that allows you to test the cable - 10 BaseT - USOC - EIA TIA 568A/B - Token Ring standards. It's on the tools page of this site - check it out. The Tester doesn't measure distance though but does everything else for about two hundred bucks. Not a bad deal when it's hitting midnight and you can't figure out what's going on with the link.