Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: Ken Thompson Newsgroups: comp.dcom.telecom Subject: Re: Need a Light to Indicate Phone *Has Rung* (Not *is Ringing*) Message-ID: <1813@accuvax.nwu.edu> Date: 4 Dec 89 22:08:58 GMT Sender: news@accuvax.nwu.edu Reply-To: Ken Thompson Organization: NCR Corporation, Wichita, KS Lines: 21 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 9, Issue 552, message 5 of 7 It sounds exactly like the ATT system we have at work. You can buy an analog phone that has a little message led that flashes once a second when there is a message. This is in addition to the sudder dial tone. Your old phone can do the job. Put an led in series with a 22K resistor across your phone line. Get the polarity right so that the led lights when the phone is ON HOOK. When you have a message the led will blink off momentarily once a second. It will flash brightly when the phone rings and when you are off hook it will go nearly out. Have fun. PS. This is being used all over our building. Ken Thompson N0ITL NCR Corp. 3718 N. Rock Road Wichita,Ks. 67226 (316)636-8783 Ken.Thompson@wichita.ncr.com