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From: jlw%ariel@ariel.UUCP
Newsgroups: net.dcom
Subject: Re: Bell 801 automatic calling unit
Message-ID: <1137@ariel>
Date: Mon, 28-Apr-86 23:16:00 EDT
Article-I.D.: ariel.1137
Posted: Mon Apr 28 23:16:00 1986
Date-Received: Sun, 11-May-86 16:31:44 EDT
References: <3058@amdahl>
Lines: 23

> 
> Does anybody in net.dcom have a interface specification for a Bell 801
> acu ? I am interested in characters other than digits given to the 801
> to have it "wait for secondary dial tone" etc.
> 
> 				Ludo J. M. Vennekens
> 				(408) 737-5074
> 				...{hplabs,ihnp4,amd}!amdahl!ludo

The 801acu uses the RS366 interface which if memory serves me right
was a four bit wide bcd+ i/f on a DB25 connector.  It was separate
from the RS-232C i/f for the modem and went on the line side of the
modem.  The DEC DN11 i/f was used for ACU duty.  If you can find
an old DEC communications handbook from the mid-70s or write to
the EIA you should be able to get a copy.



					Joseph L. Wood, III
					AT&T Information Systems
					Laboratories, Middletown
					(201) 957-5475
					<ariel!>titania!jlw