Re: CBus introductory course

["Paul Robinson" <ukcueman@xxxxxxx>]

Keith,

The wiring is done using 2 of the 4 pairs. Orange and blue are connected to
the positive terminals and white/orange and white/blue connected to
negative.

There's also a single "network burden" that must be connected.
This wires a
10uF capacitor and 1k resistor in series between the +ve and -ve sides.

I guess that does mean that what goes up one leg of a pair comes down the
other.

Paul


----- Original Message -----
From: "Keith Doxey" <ukha@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Wednesday, June 11, 2003 9:27 PM
Subject: RE: [ukha_d] CBus introductory course


> CAT5 Cable is balanced.
>
> As long as Clipsal are using the cable correctly and ensuring that
what
goes
> down one wire of a pair returns along the other wire of the pair,
there
> should be no problems whatsoever.
>
> Even if the cable was chucking out all sorts of noise, an adjacent
CAT5
> cable carrying Ethernet or KAT5 would pick up the interference equally
on
> each wire of the pair. The difference between the two interference
signals
> picked up would be ZERO therefore NO INTERFERENCE.
>
> That is the whole point of balanced transmission over CAT5.
>
> As C-Bus can be run using multiple cables, I personally would choose
to
run
> to several locations rather than just one or two cables carrying the
whole
> lot. The primary reason for doing so is resilience. If everything is
on
one
> cable and it get damaged you loose everything. If you have 4 cables
with
an
> even split of kit on them you will only loose 25% of your system.
>
> At work, if you lift the floor tiles, there are cable trays carrying
> hundreds of CAT5 cables for long distances. There are other cable
trays
> close to these carrying power cables for all the floor boxes. No
> interference problems.
>
> As I have said in previous posts, IF you have the luxury of being able
to
> run cables along separate routes with a nice big separation then do
it,
but
> if not, don't loose sleep over it. The only thing you should ALWAYS
ensure
> is that there is a PHYSICAL SEPARATION or BARRIER between Mains and
Low
> Voltage. This is a mandatory requirement for safety.
>
> Keith
>
> www.diyha.co.uk
> www.kat5.tv
>
>
> > -----Original Message-----
> > From: Paul Robinson [mailto:ukcueman@xxxxxxx]
> > Sent: 11 June 2003 21:02
> >
> > I was also wondering about the problems with mixing cbus cables
with
> > LAN/phone/Kat5 etc. Niall is strongly opposed to this - not
> > for what it will
> > do to cbus, but for what the cbus currents might do to data
cables.
> >
> > Have you run cbus cat5 next to data cat5?
> >
> > Paul
>
>
>
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