Re: German to UK phone wiring

["Timothy Morris" <timmorris@xxxxxxx>]

The four wires are designed for connection of ordinary telephones, modems,
etc. Perhaps one of the lines is also earth? I've done some more checking
and the ring signal generated is a 25Hz square wave. Do you know what UK
phones are expecting?

Tim.

> -----Original Message-----
> From: Keith Doxey [mailto:keith.doxey@xxxxxxx]
> Sent: 08 September 1999 15:22
> To: 'ukha_d@xxxxxxx'
> Subject: [ukha_d] Re: German to UK phone wiring
>
>
> 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
>
>


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