Re: [PLUG] ethernet wiring in walls

[Eugene Smiley <eug+plug@esmiley.net>]

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Ron Mansolino wrote:
> It's also handy to have a cable stub or two that you can use for
> loopbacks and continuity tests, I think for ethernet you want to
> connect pins 1 to 3 and 2 to 6 (with that little tang thing facing
> down)

Actually, Pins 1 & 2 are a pair and pins 3 & 6 are a pair when
discussing 10/100baseT ethernet -- which is being assumed to be used.
1000baseTX (Gigabit ethernet) uses all four pair (1-2, 3-6, 4-5,
7-8).

      /\
    /    \
/\  | /\  | /\
| | | | | | | |

1 2 3 4 5 6 7 8

       __
("Twang-thingy" or Locking Tab down, plug ready to be put in jack.)
(See http://www.ertyu.org/~steven_nikkel/ethernetcables.html)

I have a handy tool that I picked up at Home Depot that tests cables
(IDEAL LinkMaster, #62-200)
(http://www.goodmart.com/products/82452.htm... Jeesh, I sure don't
recall having spent $90 on these two little boxes), however it has
RJ45 on each box. Since I am getting ready to do a "wired" install
myself, I've thought about how I'd test my wiring job.

LinkMaster1 >-> Cable >-> outlet >-> outlet >-> Cable >-> Linkmaster2

If you test your 2 cables you can rule them out. This leaves any
issues being in your walls or outlets.

It will indicate failure due to shorts, reversal, split pair (see
Ron's example), and miswires. If a particular pair doesn't light up
it indicates an open circuit.

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