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Path: utzoo!mnetor!uunet!seismo!rutgers!ucla-cs!zen!ucbvax!hplabs!pyramid!fmsrl7!mibte!jbh
From: jbh@mibte.UUCP (James Harvey)
Newsgroups: comp.dcom.modems,comp.sys.ibm.pc
Subject: Re: Need Info on modem
Message-ID: <2283@mibte.UUCP>
Date: Wed, 12-Aug-87 12:33:39 EDT
Article-I.D.: mibte.2283
Posted: Wed Aug 12 12:33:39 1987
Date-Received: Sat, 15-Aug-87 01:47:27 EDT
References: <1453@ukecc.engr.uky.edu>
Organization: Michigan Bell Telephone Company
Lines: 42
Keywords: dataphone modem help info
Summary: 212 connections
Xref: mnetor comp.dcom.modems:776 comp.sys.ibm.pc:6646

In article <1453@ukecc.engr.uky.edu>, sean@ukecc.UUCP writes:
> 
> 
> Hello.
>    I recently became the proud(?) owner of a DATAPHONE 212A from Bell.
> It is a direct-connect 300/1200 auto-answer modem and there is where
> my knowledge ends.  Somehow, it is hooked up to the phone lines but

Here  is how to hook up the 212 modem.

Viewed from the rear, the right hand connector (MALE) is the telephone
line interface, the left (FEMALE) is the RS232 connector.

You will have to make a cable to connect the telephone leads.  Get
a regular telephone, the 212 will not dial for you.

Connect the telephone to pins 21 and 22

Connect the telephone line to pins 7 and 8

Connect a single pole single throw switch to pins 5 and 25

Now when the switch is closed, the modem should cut the line through
to the phone and you can dial normally.  When you hear the far end's
answer tone, throw the switch to open, this will signal the 212 to 
pick up the call (Terminal Ready must be high).

You may find the levels are set too high if you live close to the central
office.  
A normal 212AR modem transmits  at -4 dbm and requires an external pad 
to make a central  office level of -12 dbm.  Leave all the buttons out
for 300 baud, push hs in for 1200 baud.


Hope that helps

Jim Harvey
Michigan Bell
29777 Telegraph
Southfield, Mich.  48034

ulysses!gamma!mibte!jbh