Messages in this thread | | | Subject | Re: [OFFTOPIC] Detector for modem for driver I want to code | Date | Mon, 28 Jun 1999 01:25:24 +0100 | From | David Woodhouse <> |
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> > So, I really do need this device. Any help would be greatly > > appreciated. Sorry for the [OT] posting. > > I'll have a go at designing one for you, but don't hold your breath.
Telco approval is a problem for this kind of thing.
One possible solution - IIRC the 'off-hook' state is signalled by drawing a current from the line. If you can detect that current without actually being connected to the line itself, you can do this without requiring Telco approval.
Looking up the minimum current which signals the device as off-hook, and coming up with a sane and reliable method of detecting said current, is left as an exercise for the reader.
But we're drifting very off-topic.
---- ---- ---- David Woodhouse David.Woodhouse@mvhi.com Office: (+44) 1223 810302 Project Leader, Process Information Systems Mobile: (+44) 976 658355 Axiom (Cambridge) Ltd., Swaffham Bulbeck, Cambridge, CB5 0NA, UK. finger dwmw2@ferret.lmh.ox.ac.uk for PGP key.
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