Re: 2 questions...

["Keith Doxey" <keith.doxey@xxxxxxx>]

Hi Patrick,

That shouldnt happen.
You must use all 4 pairs for the 2 lines.
DO NOT USE A SPLIT PAIR FOR THE THIRD WIRE OF EACH LINE
That is the wire that carries the ringing circuit and if you use a both
wires of the pair one for each bell wire you WILL get overhearing as you
have created a long transformer winding which effectively puts them in
contact with each other.

Normal house telephone cable has 3 pairs and when people have a second line
the 3 unused wires are often pressed into service and you get exactly the
problem you have described. If the house is wired with 4 pair (CAT3 or
CAT5)
and you use for example
Blue/White, White/Blue, Orange/White for line one
Green/White, White/Green, Brown/White for line two

you will not have any problems but if you use

Blue/White, White/Blue, Orange/White for line one
Green/White, White/Green, White/Orange for line two

you will probably have overhearing.

Pair colours dont really matter much, the point is not to split a pair
between 2 lines.

Keith

Keith Doxey
http://www.btinternet.com/~krazy.keith
Krazy Keith's World of DIY HomeAutomation


> -----Original Message-----
> From: patrick@xxxxxxx [mailto:patrick@xxxxxxx]
> Sent: 11 August 1999 12:07
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Re: 2 questions...
>
>
>  <199908061959.paa0396-@xxxxxxx> wrote:
> original article:http://www.egroups.com/group/ukha_d/?start=794
> > Quick question...
> > Is it OK to use CAT5 to carry 2 phone line?
> > Thanks
> > Nick
>
> I run 2 (analogue) telephone extensions over the same piece of CAT5.
> Works fine for conventional phone calls - not so great for data.
> Ringing on one extension can bleed through into the audio path of the
> other (i.e. if one person is on the phone, and the other extension
> rings, the ringing can sometimes be faintly heard on the first
> extension). Otherwise crosstalk is not a problem for non-data use.
>
> Patrick
>
>
>
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