10BaseT and Telephone Wiring

10BaseT and Telephone Wiring

Post by Joe Chil » Fri, 21 Mar 1997 04:00:00





>> > [ snip ]
>> >Any unshielded twisted pair (UTP) cable
>> > is not only twisted to cancel out the phase of any external noise, but
>> > each pair is twisted at a different interval to cancel out noise
>> > generated from other pairs.  

>Really?  Have a reference on this?

From years of experience (the only reference I've got), I can tell you
that the orange pair has the most twist, the brown pair has the east,
and the blue and green are about the same.

-Joe Childs
Austin Telecom
Panasonic KX-T / VA / DBS broker

 
 
 

10BaseT and Telephone Wiring

Post by B Kara » Fri, 21 Mar 1997 04:00:00




> > > [ snip ]
> > >Any unshielded twisted pair (UTP) cable
> > > is not only twisted to cancel out the phase of any external noise, but
> > > each pair is twisted at a different interval to cancel out noise
> > > generated from other pairs.

> Really?  Have a reference on this?

> - Dave Beal

Sure.. Call Belden, Alhpa, or some other cable manufacturer, and ask for
the specs on their Cat 5 cable.  The different amountof twists per inch
is referred to as the twist pitch.  And yes, it is supposed to vary
between the 4 pairs.

 
 
 

10BaseT and Telephone Wiring

Post by Michael A. Colv » Fri, 28 Mar 1997 04:00:00




Quote:>I'm building a new home (actually, I'm contracting it out) and I wanted
>to do the data wiring myself.  I've seen a lot of suggestions to put in
>2x RG-6 for cable-TV applications and one or two Cat-5 10Base-T wires.

>Can anyone tell me why I need that much data cable?  I'm not
>complaining, instead I just want to know what all of the data pairs of
>the 10BaseT will be used for.

>Here is my thought... I wanted to use my Cat-5 10BaseT cable to run both
>computer applications and telephony applications.  Can/Should this be
>done?  I know that the computer portion only uses 2 pairs, and each
>phone line uses one pair.  I anticipate needing a third line for a FAX
>application only and can run that seperately to the home office.

>So, I guess my question is: Can 10BaseT and 2 phone lines live
>peacefully on one Cat-5 Cable?

>If they can, is the additional 4 pairs of wire recommended to handle
>home intercoms, future phone systems, etc, etc, etc?

>Replies and experiences via email would be greatly appreciated.

>-- Nick

Yes, it can be done!  In fact, that's how we are wiring the libraries
in our school district (I am a technology specialist (computer
engineer) for the district.  I would restrict the usage to phone
systems, though...