Re: Telephone Master Socket

[Keith Doxey <ukha@xxxxxxxxxxx>]

Quoting Rob Lamb <rjl@xxxxxxx>:

> I've just got hold of an MDS Opera 308 PBX for the home, and it says
> that each extension needs a master socket. I've had a look around
> but there seems to be different types of master socket ( 1/4A, 2/4A,
> 3/4A etc..) but don't really explain what the differences are. Any
> ideas as to which is the correct one and the best place to but from?
>

Hi Rob

Physical size.

1/ = a small rarely seen box about 40mm square (havent seen one for about
20
years!)

2/ = the ones often fitted to the skirting board about 60mm square.

3/ = normal single gang faceplate size with a single socket.

there are also 4/ and 5/ faceplates which have two sockets on a single gang
faceplate. The difference between 4/ and 5/ is that one has two sockets on
the
same circuit (double), the other has two independant circuits (dual) but as
I
havent touched one for about 8 years I'm buggered if I can remember which
is
which. (to be perfectly honest I could never remember which was which even
when
I was using them!!!!)

The part after the / denotes the connector and whether it it is master, pbx
or
secondary.

1A = Master with surge protection
2A I think is PBX master but we always used 1A'a
3A = Secondary
3C is a reversed keyway Secondary used by some Digital PBX's.

Normal BT lines would usually have the following setups

Older lines

2/1A-----2/3A----2/3A

3/1A-----3/3A----3/3A

Current lines

NTE5-----2/3A------2/3A

NTE5-----3/3A------3/3A


Numbers above 3 are the same as 1/2/3/ but with screw terminals instead of
IDC
punchdowns. Dont have any more info on the 4/5/6/ as we only used IDC
types.

Hope that helps

Keith

www.diyha.co.uk
www.kat5.tv


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