Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site ucbvax.BERKELEY.EDU
Path: utzoo!decvax!ittatc!dcdwest!sdcsvax!ucbvax!pedsgo.UUCP!tom
From: tom@pedsgo.UUCP
Newsgroups: mod.telecom
Subject: Telephone Line Interfacing Circuits
Message-ID: <8606270733.AA19321@ucbvax.Berkeley.EDU>
Date: Wed, 25-Jun-86 07:25:41 EDT
Article-I.D.: ucbvax.8606270733.AA19321
Posted: Wed Jun 25 07:25:41 1986
Date-Received: Sat, 28-Jun-86 00:34:54 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: pedsgo!tom@seismo.CSS.GOV (Tom Gillispie)
Organization: Concurrent Computer  (a Perkin-Elmer Company), Tinton Falls, NJ
Lines: 26
Approved: telecom@xx.lcs.mit.edu


Can anyone point me to some good books or magazine articles about
converting between the 600-ohm 2-wire interface used on dial lines and
op-amp type audio circuits?  Practical circuits/examples would help me the
most, but well-written theory will still help.

I have purchased an old UDS DAA which does not separate the transmitted and
received signals.  It has only a 600-ohm 2-wire connection for the 'data'
signals.  I want to use it with circuitry that handles the received portion
alone (DTMF decoding) and with circuitry that handles the transmitted
portion alone (voice synthesis, etc.).  The DAA will give me a legal I/F
to a dial line, but that wont do me much good if I cant get audio data into
and out of the thing.

I have a EE degree but have spent the past 5 years doing software work, and
alot of my efforts in school went to learning practical digital circuits,
not analog circuits.

If I get some good leads I will check them out (this may take some time)
and post a summary.  Thanks very much, in advance!

NAME:   Tom Gillispie 
UUCP:   ...{pesnta|prcrs|princeton|topaz|hjuxa|vax135}!petsd!pedsgo!tom
USnail: CONCURRENT Computer Corporation (a Perkin-Elmer Company)
	M/S 307, 106 Apple St., Tinton Falls, NJ  07724
MA BELL:(201) 758-7321