CAT5 / CAT3 cable

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Kurt Tomicich
2005/02/15

Reference

Subject:	CAT5 / CAT3 cable
Category:	Networking\ Reference

Revision Date:	2010/09/02 Modified: 2012/01/14


		Reviewers
Originator	Previous	Current	Future
Kurt Tomicich	Kurt Tomicich/KRT	None	None

Note: TX & RX are swapped on Hub's (see crossover cable). Also, please note that it is very important that a single pair be used for pins 1 and 2; 3 and 6. If not, performance will degrade.

Telephone

Note that while the old solid color code was well established for pairs 1 and 2, there are several conflicting conventions for pair 3. The colors shown above were taken from a vendor of "silver satin" flat 8-conductor phone cable that claims to be standard. At least one other vendor of flat 8-conductor cable uses the sequence blue, orange, black, red, green, yellow, brown and white/slate.

In the RJ11 pictured above you would read the pinouts 1 through 6 from right to left, using the bottom view (ie - hold the RJ11 connector in your hand, tab side down, with the cable opening towards you; the pins are numbered 1-6, left to right).

Telephone Handset

(4P4C)

The connector incorrectly known as

RJ9

the

de facto

industry standard for wired

telephone

handsets. It is used to provide connection from the base of the telephone to the handset. "RJ" stands for

Registered Jack

, a family of telephone connection standards. This

handset connector

is actually not a

Registered Jack

at all, since it was never intended to connect directly to the telephone service lines. It uses the 4P4C

modular connector

, which has four pins or electrical connections per connector.

RJ9 plugs are widely used for connecting handsets to the telephone base. In such scenarios the following wiring diagram is used:

Submitted for review on 2/15/2005
Review completed by Kurt Tomicich on 2/28/2005

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