RE: Re: Starting a new flood wiring project

["Brian G. Reynolds" <brian.g.reynolds@xxxxxxx>]

You guy's are sssoooo clever!

Sounds interesting to me!

B.

> -----Original Message-----
> From: Keith Doxey [mailto:ukha@xxxxxxx]
> Sent: 12 October 2001 20:07
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Re: Starting a new flood wiring project
>
>
> Ah,
>
> I see.
>
> Thats what I get for trying to read a few messages quickly via
> Yahoo rather
> than taking time to read and reply properly.
>
> Over 120 messages downloaded tonight :-(
>
> Quickly going through them now before i get back to PIC
> programming for KAT5
>
> Keith
>
> -----Original Message-----
> From: Graham Howe [mailto:graham@xxxxxxx]
> Sent: 12 October 2001 17:55
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Re: Starting a new flood wiring project
>
>
> None of my CAT5 cables are 'fixed' purpose, they all terminate in
standard
> RJ45 ports. What I am saying is that I have in a couple of places, put
two
> devices on one piece of CAT5 that is then terminated with an RJ45 plug
and
> can be stuck into any socket. It is true to say that this has so far
> involved items that tend to be in a fixed location, but part of
> the logic of
> plugging such items in is to enable them to be relocated if
> necessary (e.g.
> false triggers on a PIR or removal of an alarm system due to house
move).
>
> Graham
>
> > -----Original Message-----
> > From: Keith Doxey [mailto:ukha@xxxxxxx]
> > Sent: 12 October 2001 14:42
> > To: ukha_d@xxxxxxx
> > Subject: [ukha_d] Re: Starting a new flood wiring project
> >
> >
> > Graham,
> >
> > We are talking about different areas.
> >
> > You are mainly talking about cables that are dedicated for a
> > particular FIXED purpose.
> >
> > I was referring to the proper usage of STRUCTURED WIRING.
> > Cables that can be used for any purpose.
> >
> > Agreed you can buy splitters but that then takes the simplicity
away
> > from structured cabling. You also have to be very careful about
how
> > the splitters are wired.
> >
> > for example
> > If the 8 wires are split 1-4 into socket 1, 5-8 into socket 2
then
> > they are truely split, but if all 8 wires go to each socket but
> > device A uses 1-4 and device B uses 5-8 again no real problem.
The
> > problem comes when you unplug device A to use device C which used
1-
> > 6, if you have a true splitter then device C would just not work,
if
> > it was a doubler, you could damage both B & C.
> >
> > There is also an increased possibility of crosstalk between
different
> > devices due to the closer proximity of the cable pairs. Within
the
> > shath there may only be 1mm between conductors whereas with
separate
> > cables there is a minimum of 3mm even if the cables are adjacent
for
> > the whole of the run. CAT5's inherrant high noise immunity may
well
> > prevent any problems but why tempt trouble for the sake of a few
> > quids worth of cable.
> >
> > Keith
> >
> >
> >
> > --- In ukha_d@y..., "Graham Howe" <graham@s...>
wrote:
> > > <very timid mode>I think Keith is wrong, see
below</very timid mode>
> > >
> > > Graham
> > > A CAT5 wire has 8 wires, in a couple of places I have two
devices
> > connected
> > > to a single CAT5 cable each using different wires.
Specifically, at
> > my front
> > > door I have the door contact (magnetic, 2 wires) and the
hall pir
> > (4 wires)
> > > both connected to a single CAT5 cable. In the dining room
(others
> > to follow)
> > > I have embedded an IR receiver inside a PIR. In both cases
the
> > singals from
> > > the separate devices are split out at node zero through
Krone
> > blocks. In
> > > fact a computer network only uses 4 wires and phone only 3
so they
> > can be
> > > combined too (splitters can be bought off the shelf). Having
said
> > all of
> > > this, you should not plan your cable laying to be used in
this way
> > as it
> > > leaves no headroom at all. But for those of us who have done
the
> > cabling and
> > > will not be allowed to run more, there are ways of sharing
and
> > splitting.
> > >
> >
> >
> >
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