I suppose 2 Melco 1A2 A-lead adapters with interlocking relays?
> That's a really clever solution William, quite an ingenious solution to
the
> problem.
>
> If you also poked an inline (current sensing) relay on the shared CO line,
> you could even work something out to disable the modem from being able to
> sieze the line if it was already in use...
>
>
>
>
> > I get about 39,000bps through my KXT-616. Not fast enough.
> >
> > With the modem wired direct to the MPOP via CAT5 I get 49,000-52,000bps.
> >
> > I wanted the speed AND have the CO line appear on the key system without
> > people barging into a data call in progress so........
> >
> > I wired the modem jack through an old Melco 1A2 "A-lead" adapter to the
> > MPOP. This is the adapter that Bell used to use to add SLTs (usually
> > "Design Line" sets, aka Mickey Mouse Phones) to a 1A2 system. It
> > requires -24V battery. This provides a relay closure when the modem is
> "off
> > hook". I think you can still get something like them.
> >
> > I installed a 4PDT 24VDC relay at the KTU which pulls in with the modem
> > going off-hook. When the relay pulls in, 2 things happen: Tip and Ring
> > (which is bridged to the CO line before the Melco "A-lead" adapter) is
> > opened to the Pana KTU. Another contact is wired to short out a station
> > port which is programmed with the "Pickup Dial" feature. This is
> programmed
> > to pickup the specific CO line. The Pana waits about 2-3 seconds to do
> > this, so the Pana's attempt to pick up that CO line occurs well after
the
> > relay has opened the T/R connection; no chance of the KTU going in on
the
> > data call.
> >
> > To users of the key system, that CO line is busy and cannot be accessed;
> to
> > the Modem, it is connected directly to the CO without going through the
> key
> > system. When the modem disconnects, the CO line is restored to the KTU,
> and
> > everyone is happy.
> >
> > Only problem is when someone fires up the internet while someone is on
the
> > line with the Pana KTU; the voice call is dropped
> > off..........................
> >
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