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From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.dcom,net.periphs
Subject: Re: building a modem - How do I use the telephone lines?
Message-ID: <5605@utzoo.UUCP>
Date: Fri, 17-May-85 12:52:58 EDT
Article-I.D.: utzoo.5605
Posted: Fri May 17 12:52:58 1985
Date-Received: Fri, 17-May-85 12:52:58 EDT
References: <2371@wateng.UUCP> <10625@brl-tgr.ARPA>, <2401@wateng.UUCP>
Organization: U of Toronto Zoology
Lines: 17

> One idea that I had some time ago for interfacing to phone lines is to take
> advantage of the telephone revolution we've been having lately:  buy yourself
> a $9.95 (CDN) el cheapo telephone (which is, note, approved) and replace
> the microphone and speaker with your own electronic interfaces.  This gets
> you past the interconnect problem

I'm not sure, but I suspect that the Approved el-cheapo telephone becomes
unApproved the instant you mess with its insides, however trivially.  For
example, its Approved status might well depend on the characteristics of
the microphone and/or speaker to some degree.  If one wants to be 100%
Approved with homebrew hardware, the thing to do is to buy an Approved
phone-line interface; such things are available, although they're not as
cheap as el-cheapo phones, and I believe they confer Approval on equipment
that incorporates them.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry