On Dec 11, 10:08 am, m <mi...@tiscali.co.uk> wrote:
> Graham. wrote:
> >>http://photos1.blogger.com/blogger/6...0/DSC01426.jpg
>
> > Is it me, or is there something decidedly odd about this image
>
> Yes there are odd bits of (presumably now unused) blue/white and
> white/blue cable left connected and cut-off in the bundle.
> Also for some reason someone has terminated the green pair on the unused
> IDC connectors 1 & 6 - alo with cut off spare bits.
> It is usual for these to be left "hanging" and, if removing cables
> (unless these are at the bottom of the IDC block and no insertion tool
> is vaialable) they should be removed completely to reduce the chance of
> shorting out.
>
> A mess really!
>
> Mike
It looks as though this socket has been used on a PABX installation at
some time, which uses all 6 wires for the extra signalling required in
that application. It also looks as though there used to be two cables
terminated in the socket.
Or, if originally terminated to BT spec, you would use 6-wire cable
and terminate all of them - whether or not they were needed. This
meant that if you got a faulty pair then you could use the green pair
to replace the blue / orange pair instead of running a new cable. If
you cut the green pair off short, then if you got a faulty pair you
were stuffed.
Alister
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