Re: German to UK phone wiring

[Keith Doxey <keith.doxey@xxxxxxx>]

Hi Tim,

The ringing is not GENERATED by the master socket.
It is already present on the line assuming it is intended for a normal
analogue telephone. The master socket merely EXTRACTS the ringing and
places it on the third wire.

Line connects to 2 & 5
ringing is extracted fron 2 by a 1.8uF capacitor and placed onto 3.
the ringer in the phone is connected to 3 & 5
the speech circuit is connected to 2 & 5
recall earth if required is connected to 4

If you have 4 terminals on your PBX it may be intended to connect to
dedcated key systemphones.
Typically one pair is for speech and the other for data although there are
digital systems that only use one pair (Norstar) or seperate pairs for
transmit and receive data (Octara)

Without exact details on your system I cant advise exactly, but if you have
already tried to connect a phone to the speech pair and had dial tone, you
will not do any damage by connecting  a master socket, or secondary socket
with 1.8uF capacitor connected between 2&3 to see if it rings.

for more information look at my website in the telephones section.
http://www.btinternet.com/~krazy.keith/telephones/pots.html

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

-----Original Message-----
From:	Timothy Morris [SMTP:timmorris@xxxxxxx]
Sent:	Wednesday, September 08, 1999 12:41 PM
To:	Ukha_D@Egroups. Com
Subject:	[ukha_d] German to UK phone wiring

I use a cordless ISDN PBX from Germany in the UK. As it has been approved
for Euro ISDN there is no problem with phone operation. It has two
connectors for permanently wired phones, which are to the german standard.
If I connect a UK phone to it, I can dial out, but the specs for the ring
signal are obviously not the same. I have read somewhere that it is
possible
with some systems to wire them up to a BT master socket to generate the
required ring signal from the two signal wires. AFAIK a master socket is
the
same as an ordinary socket with a capacitor wired across two of the
terminals. As I have loads of secondary sockets lying around, can anyone
shed any light on this?

If I put a multimeter across the relevant terminals (without master socket
attached), what voltage should I be looking for, and across which terminals
when the ring signal is being generated by the PBX? The output from the PBX
has four wires, two of which I know are for voice, I presume the others are
for ringing. It may be that the ring signal is not sending out a high
enough
voltage for the phone. If this is the case will wiring a resistor in series
increase the voltage?

Tim.


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