USOC/WECO CAT5 Cable

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 Question by Benny Bova posted 01 Sep 2005
 USOC/WECO CAT5 Cable
I need to know what each wire and pair does for a CAT5 cable that is wired USOC on one end and WECO on the other end? and what changes from one end to the other?
Also, do you know of a wire cable standard that uses all 4 pairs and why?
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 Answer by Joseph Golan posted 01 Sep 2005
Dear Benny,

There are a couple of USOC configurations that would fit your situation RJ-11 (one pair); RJ-14 (2 pair); RJ-25 (3 pair); and RJ-61 (4 pair). The RJ-61 uses an 8 pin connector and all the others are a 6 pin connector. The example below is for the RJ-25, if you want an RJ-11 or RJ-14, just eliminate the other pairs. T-tip color, R=Ring Color, numbers next to T or R are the pair number: i.e. 4-T1 is pin 4 is the Tip side of pair 1. See this url for color codes of a 4 pair cable:
http://www.cabling-design.com/references/colorcodes/4pair.shtml

RJ-25
-----
1-T3
2-T2
3-R1
4-T1
5-R2
6-R3

RJ-61
-----
1-T4
2-T3
3-T2
4-R1
5-T1
6-R2
7-R3
8-R4

The WECO standard is also known as AT&T 258A and also T568B. See this url for that pin out (2nd picture):
http://www.cabling-design.com/references/pinouts/t568ab.shtml

Standards that require all 4 pairs at this time are for Gigabit Ethernet aka 1000BaseT as well as others.
There are many other applications that use some of the 4 pairs for their services.
For 100BaseT and 10BaseT only pins 1,2,3 & 6 are used and for the T568B standard this is the orange pair on pins 1 & 2 and the green pair on pins 3 & 6.
Hope this answers your question.
Sincerely,
Joseph Golan, RCDD

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