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- 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
-
- 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
-