PLEHN%mit-mc@sri-unix.UUCP (03/01/84)
From: Allan D. Plehn <PLEHN@mit-mc> A friend of mine has acquired some 300/1200 baud modems built by Western Electric. I have been trying to help interface the modem to his personal computer. I can't even figure out where to connect the telephone line. The modem is 2 inches high by 6 wide by 11 deep. It has 5 push-push type switches on the front and a number of indicators behind the red plastic faceplate. It says "Dataphone 300/1200" on the front faceplate plus the Bell symbol. On a label on the bottom, it says "Data Set 212A, AR Options" and has a chart showing internal DIP switch settings for various options. Another label says: "4702 Data Mounting P/O Data Set 212A OR AR Type Series 1 81 MG 02" There are two 25-pin data connectors on the rear, one male and one female. I cannot see any place to connect the phone line anywhere, inside or out. If anyone could furnish the necessary interfacing information I would certainly be indebted. I am hoping that I can talk my friend into giving me one of these modems so I am especially anxious to be helpful. PLEHN%MIT-MC
pcc@hlhop.UUCP (P.C. Criqui) (03/05/84)
Being an AT&T Technologies (nee WECO) employee, I find this request for technical information most interesting. The nomenclature provided in the request is for a modem that is not for sale, has never been for sale, and therefore would appear to be stolen property. In any event, you'll have a hell of a time trying to make it work. That particular modem was never intended to work as a stand-alone unit, nor will it work in conjunction with a regular telephone. As far as I know, the component that is required to make it work is also not for sale. You will notice that I have avoided describing the missing piece. That is simply because it is probably available to your "friend" from the same source that the modems were acquired, and I've no intention of telling him what to look for. If this message conveys my irritation, understand that I feel that it's bad enough that the U.S. Congress and the FCC are trying to drain my lifeblood with their absurd restrictions on AT&T, and the unfair financial advantages they're giving our competitors, without my fellow "computer buffs" (I've never cared for 'hacker') illegally acquiring (read stealing) our equipment. Pete (I've just never heard of Public Domain Hardware before!!!) Criqui AT&T Technologies at AT&T Bell Laboratories, Short Hills, N.J.
dya@unc-c.UUCP (03/08/84)
References: sri-arpa.17044
Probably (looking at the front of the modem) pins 9 and 8 on the
RIGHT HAND 25 pin connector (facing the back) are the local loop (telephone
line). In addition, you will need a switch connected from 5 to 25 which
engages the modem after you have accessed the remote modem (originate
mode); or enables answer mode.
The other one is usual RS232
David "Last of the Analog" Anthony
(urp!dya)