[asterisk-users] GEN-GEN and Manual Ring-Down (MRD)?

[Raj Jain]

On Mon, Nov 10, 2008 at 6:56 AM, Tony Mountifield
<tony at softins.clara.co.uk> wrote:
> Does anyone here know anything about GEN-GEN analogue circuits, also
> known as Manual Ring-Down (MRD)? Apparently they are widely used in
> Hoot'n'Holler systems for financial dealer-boards.
>
> I have been asked to try and interface to such circuits, and have been
> having great difficulty locating any specifications for the interface.
>
> Apparently, they are always-on 2-wire analogue circuits with no tip
> voltage or loop current, and on-demand superimposed ringing voltage in
> either direction for signalling (to do nothing more than get the remote
> end's attention).
>
> I was wondering whether it is possible to adapt an FXS or FXO port to
> operate in such a mode, but I'm not optimistic.

Your understanding of MRD is correct (these are nailed-up connections
with only ring-gen capability). I've personally not tried this w/
Asterisk FXS/FXO ports but If you can make it work that way pls. let
us know.

--
Raj Jain