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From: jlw@ariel.UUCP (J.WOOD)
Newsgroups: net.dcom
Subject: Re: Bell 801 automatic calling unit
Message-ID: <1137@ariel.UUCP>
Date: Mon, 28-Apr-86 14:16:58 EDT
Article-I.D.: ariel.1137
Posted: Mon Apr 28 14:16:58 1986
Date-Received: Wed, 30-Apr-86 00:13:01 EDT
References: <3058@amdahl.UUCP>
Distribution: na
Organization: AT&T-ISL, Holmdel, NJ
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