Article View: alt.dcom.telecom
Article #282Re: How does caller ID work?
From: Larry Jones
Date: Tue, 26 Jan 1993 18:30
Date: Tue, 26 Jan 1993 18:30
15 lines
1418 bytes
1418 bytes
In article <ckirby.727980782@silver.cs.umanitoba.ca>, ckirby@silver.cs.umanitoba.ca (Chris Kirby) writes: > So, theoretically, one could modify and old 1200 baud modem to use the > modified tones (or even just pass the signal through some kind of filter to > transform the tones to normal 1200 baud tones) and have caller ID for free? No. If you have an old 1200 baud *half-duplex* modem (Bell 201? 202?), it works as-is. If you have a modern full-duplex modem (Bell 212), it uses a completely different modulation scheme and is totally incompatible (unless by "modify" you mean rip out everything but the power supply and line interface and replace it). ---- Larry Jones, SDRC, 2000 Eastman Dr., Milford, OH 45150-2789 513-576-2070 larry.jones@sdrc.com It's either spectacular, unbelievable success, or crushing, hopeless defeat! There is no middle ground! -- Calvin
Technical Details
Message-ID:
<569@heimdall.sdrc.com>Path:
arc1-ca.pugleaf.net!sparky!uunet!olivea!hal.com!decwrl!elroy.jpl.nasa.gov!sdd.hp.com!caen!uwm.edu!spool.mu.edu!agate!iat.holonet.net!psinntp!psinntp!heimdall!thor!scjonesReferences:
<michaelm.727416353@extro.ucc.su.OZ.AU> <C14wy0.Aqy@hatch.socal.com> <ckirby.727980782@silver.cs.umanitoba.ca>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!sparky!uunet!olivea!hal.com!decwrl!elroy.jpl.nasa.gov!sdd.hp.com!caen!uwm.edu!spool.mu.edu!agate!iat.holonet.net!psinntp!psinntp!heimdall!thor!scjones From: scjones@thor.sdrc.com (Larry Jones) Newsgroups: alt.dcom.telecom Subject: Re: How does caller ID work? Keywords: caller id Message-ID: <569@heimdall.sdrc.com> Date: 26 Jan 93 18:30:38 GMT References: <michaelm.727416353@extro.ucc.su.OZ.AU> <C14wy0.Aqy@hatch.socal.com> <ckirby.727980782@silver.cs.umanitoba.ca> Sender: news@heimdall.sdrc.com Lines: 15