Network/CAT snake cable

[Jason Pruzin]

Hello All,

Now that I'm in the world of digital I've engaged in the oh so fun process of wiring network cables.  Let me just say, give me a soldering iron and TRS, XLR, and even a TA3-5F/M connector any day.

Anyways, I would just like to understand the science behind the wiring schemes for network cable.  Why must one split the solid green and striped green (for the "B"/AT&T scheme) instead of simply inserting the pairs 1:1?

So if you're bored, and feel like educating me, I'd love to gain a greater understanding.  I'm sure when I have some downtime maybe I'll pick up a network engineer book, but if anyone feels like enlightening the forum I'm sure I'm not the only one who is curious.

TIA,

Jason

--
M. Jason Pruzin
Resident Sound Designer/Engineer
Arkansas Repertory Theatre
501-258-7952
www.therep.org

[Kevin Faulhaber]

On 11/13/09 2:44 PM, Jason Pruzin wrote:

> Anyways, I would just like to understand the science behind the wiring schemes
> for network cable.  Why must one split the solid green and striped green (for
> the "B"/AT&T scheme) instead of simply inserting the pairs 1:1?

In a nutshell, backwards compatibility. It preserves the pinout for RJ11
and RJ14 connectors.

http://en.wikipedia.org/wiki/RJ11,_RJ14,_RJ25

Kevin

[Heath Roberts]

On Fri, Nov 13, 2009 at 2:44 PM, Jason Pruzin <mjpr...@gmail.com> wrote:

Now that I'm in the world of digital I've engaged in the oh so fun process of wiring network cables.  Let me just say, give me a soldering iron and TRS, XLR, and even a TA3-5F/M connector any day.

Anyways, I would just like to understand the science behind the wiring schemes for network cable.  Why must one split the solid green and striped green (for the "B"/AT&T scheme) instead of simply inserting the pairs 1:1?

So if you're bored, and feel like educating me, I'd love to gain a greater understanding.  I'm sure when I have some downtime maybe I'll pick up a network engineer book, but if anyone feels like enlightening the forum I'm sure I'm not the only one who is curious.

It's for backwards compatibility with phone wiring (RJ11 & RJ14), where the 'first' wire pair was in the center two pins, and the 'second' pair was in the next outermost pins.

Wikipedia has pretty good articles:

http://en.wikipedia.org/wiki/TIA/EIA-568-B

http://en.wikipedia.org/wiki/RJ14

--
Heath Roberts
htro...@gmail.com