Re: Ring Wire and DECT

[pslists <pslists@xxxxxxxxx>]

The ringer wire on UK phones was an anti-tinkle mechanism to stop
bells
of other extensions "tinkling" when dialling. The ring signal is
presented on a separate, DC isolated, ringer line. Since MF (tone)
dialling is now almost universal there is no issue with tinkling.

Since this was a specifically British solution, imported phones don't
understand the ringer line and since the ring signal is present on the
remaining two wires they work OK using their own isolating capacitor
instead of the one in the master socket.

Older phones, confirming to the BT specification still need the ring wire.

Pete

Gareth Cook wrote:
> All these agents give me blank looks (although i cant see them!) on
the
> telephone - why does a DECT phone ignore the ringer circuit and rings
> anyway, but a BT wired phone in the same socket will not ring when no
> ringer wire is present ?
>
> Is the ringer wire then now redundant on a BT line ? No longer needed
?
>
> G.
>
>  Gareth Cook
>  IT Architect / Project Manager, SWG Sales Europe
>  Office: +44 (0)1784 445166 - Mobile: +44 (0)7980 445166
>  email: g@xxxxxxx
>
>
>
>
>
>
>
> Unless stated otherwise above:
> IBM United Kingdom Limited - Registered in England and Wales with
number
> 741598.
> Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6
3AU
>
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> **** Sponsored By http://www.Berble.com ****
> ****       Computers You Carry          ****
>
>
>
>
>
>
>
>
>



--
No virus found in this outgoing message from Pete Shew.
Checked by AVG Free Edition.
Version: 7.5.516 / Virus Database: 269.17.13/1213 - Release Date:
07/01/2008 09:14