Re: Telephone : Checking for "RTS"

"R.Wieser" <address@xxxxxxxxxxxxx> wrote in message
news:4440dbf9$1$31648$e4fe514c@xxxxxxxxxxxxxxxxx
John Fields <jfields@xxxxxxxxxxxxxxxxxxxxx> schreef in berichtnieuws
ig2042150nln4l4sqcr67d2n0p51tf45ln@xxxxxxxxxx

Hello John,

On Fri, 14 Apr 2006 14:25:53 +0200, "R.Wieser"
<address@xxxxxxxxxxxxx> wrote:

I'm currently trying to build a Caller-ID (in the Netherlands,
meaning
the phone-company uses DTMF to send the CLID).

<snip>

I don't know what you mean by the "A and B" lines, but if it's like
tip and ring is over here, why not connect the IRLEDs from two
optocouplers in anti-parallel and connect that set in series with
either A or B?

Yes, the A and B lines are comparable to "tip" and "ring".

And alas, that method is only good when the phone has been picked up. I
need to know what happens when the phone is still on-hook (before the
phone
rings for the first time)

Your suggestion is allready part of my design, so I know when the phone
has
been picked up (and tells my controller to interpret eventually incoming
DTMF-signals differently).

Thanks for the suggestion though.

Regards,
Rudy Wieser



Something like this? -
http://products.zarlink.com/product_profiles/MT91610.htm

Ken


.