Re: Can twisted wire replace shielded wire?


"Bill" <kinzie@xxxxxxxx> wrote in message
news:1132798706.020165.46590@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> 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...
>

Bill,
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.
--
jeff


.

Relevant Pages

  • Re: DSL Speed
    ... >> was limited by that wire to 46k. ... >>> the telco did at their end. ... >>> I wonder how a DSL signal can carry 1.5M through those mile of wire. ... The DSLAM equipment can be located there. ...
    (comp.dcom.telecom)
  • Re: DSL Speed
    ... It seems to me that if DSL uses the same wire dialup ... the same crosstalk will be present. ...
    (comp.dcom.telecom)
  • Re: DSL slowdown
    ... connection was "very slow". ... Try connecting the DSL modem directly to the phone line with NO filter at that point - it's only the phones, computer modems and FAX machines that need to be filtered and the DSL port should be "straight through". ... Even a portable phone if the DSL wire is very close to it. ...
    (comp.dsp)
  • Re: Home Telephone Wiring
    ... The wire coming in from ... >> my house have six wires. ... You need to insert a DSL filter for the phone line ...
    (alt.home.repair)
  • Re: DC Voltage Recorder Question
    ... >> Wire a phone jack directly to the first point the wire enters your ... >my DSL service and the DSL people ... istm iirc that if one shorts the red and the green for a little while, ... it's possible to "blow a fuse" at the central office. ...
    (alt.home.repair)