Search found 3 matches

by thope
Tue Mar 08, 2005 2:59 pm
Forum: General Discussion
Topic: Telephone Message Waiting Indicator Circuit
Replies: 4
Views: 1055

Re: Telephone Message Waiting Indicator Circuit

Thanks philba - tried Discover Circuits - no luck yet. I have found spec sheets for "Zarlink MT88E39" and "MXCOM CMX673" whose application noted indicate a 2 chip scenario - one chip handling the FSK the other chip takes the line off-hook and "listens" for the stutter tone, then goed back on-hook. I...
by thope
Mon Mar 07, 2005 1:17 pm
Forum: General Discussion
Topic: Telephone Message Waiting Indicator Circuit
Replies: 4
Views: 1055

Re: Telephone Message Waiting Indicator Circuit

found a little bit more info - I am looking to implement a visual message waiting indicator (vmwi) prefereably with the ability to detect either the FSK signal or the stutter dial tone.<p>Any links to circuits or chip specs appreciated.
by thope
Mon Mar 07, 2005 12:11 pm
Forum: General Discussion
Topic: Telephone Message Waiting Indicator Circuit
Replies: 4
Views: 1055

Telephone Message Waiting Indicator Circuit

I am trying to find a message waiting indicator (MWI) circuit that I can connect to a phone line and have an LED glow or flash to indicate that there is a message on the telephone companies voice mail system. I (believe I) need to detect the stuttered dial tone that the phone company uses to indicat...