Re: Can twisted wire replace shielded wire?
- From: "Jeff Lowe" <jalowe44X@xxxxxxxxxxxxxxxxxxx>
- Date: Thu, 24 Nov 2005 22:06:42 -0500
"Bill" <kinzie@xxxxxxxx> wrote in message
> Bill Roberto wrote:
> > I had to make a communication cable for a customer today. I went to
> > Orvac's and asked for 100' feet of 4 wire shielded cable. The salesman
> > said he went to a 3 day wire seminar from Beldon Cable. They claim that
> > twisted wire will work as good or better than shielded cable. I asked
> > why and he said that any noise picked up by one wire gets cancelled out
> > by being wrapped around the other wires. I figured that would probably
> > be true for any electromagnetic noise but what about RF noise? He didn't
> > know, so I bought the shielded because I don't want to experiment on a
> > customer. Has anyone used twisted wire cable for communications?
> Having recently installed DSL, I've been dealing with the "lost sync"
> dance. One of the fixes I was instructed to to do (though only one of
> serveral for me...) was to replace my flat phone wire that went to my
> DSL modem from the wall with a twisted (round) wire. It did help some
> of my s/n problems. The biggest problem was dropping cable for DSL but
> that's sad story for another day...
Depending in your distance from the Central Office (CO) there may be several
peaking coils along the line. These improve the quality of voice response of
the line, but they play hell with DSL. As I live up 4 miles of dirt road it
took a number of calls to the telephone company before they got into the
truck and went and found all the coils. DSL has been very fast and reliable
since. BTW, cable was not an option since it doesn't come out this far.
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