Article View: sci.electronics
Article #9265Re: telephone Caller ID
From: Richard O'Rourke
Date: Fri, 04 Jan 1991 04:48
Date: Fri, 04 Jan 1991 04:48
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In article <1991Jan3.163735.23511@zoo.toronto.edu>, henry@zoo.toronto.edu (Henry Spencer) writes: >In article <1991Jan2.183802.13412@amd.com> lpdjb@brahms.amd.com (Jerry Bemis) writes: >>How is the caller ID encoded on the phone lines? > >It's one of the old 1200-baud modem encodings, I think. You get it only >once, and there is no parity or other error detection/correction. There is a checksum. If the CID box gets a failed checksum it is supposed to ignore the data and not display a number. > > "The average pointer, statistically, |Henry Spencer at U of Toronto Zoology > points somewhere in X." -Hugh Redelmeier| henry@zoo.toronto.edu utzoo!henry -- Richard O'Rourke: (604)438-8249 | Grass Root Systems: 436-1995 uunet!van-bc!mplex!grassys!ror | ror@grassys.bc.ca
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!van-bc!eng!grassys!rorReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!van-bc!eng!grassys!ror From: ror@grassys.bc.ca (Richard O'Rourke) Newsgroups: sci.electronics Subject: Re: telephone Caller ID Summary: Checksum Message-ID: <167@grassys.bc.ca> Date: 4 Jan 91 04:48:16 GMT References: <1991Jan2.183802.13412@amd.com> <1991Jan3.163735.23511@zoo.toronto.edu> Organization: Grass Root Systems, Burnaby, B.C., Canada Lines: 16