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From: kent@caip.rutgers.edu@tifsie.UUCP
Newsgroups: mod.telecom
Subject: Submission for mod-telecom
Message-ID: <8702040133.AA16980@tilde>
Date: Tue, 3-Feb-87 20:33:58 EST
Article-I.D.: tilde.8702040133.AA16980
Posted: Tue Feb  3 20:33:58 1987
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Path: tifsie!kent
From: kent@tifsie.UUCP (Russell Kent)
Newsgroups: mod.telecom
Subject: Re: Mod-Tap
Message-ID: <307@tifsie.UUCP>
Date: 4 Feb 87 01:33:24 GMT
Article-I.D.: tifsie.307
Posted: Tue Feb  3 19:33:24 1987
References: <8702020424.AA11371@mimsy.umd.edu>
Organization: TI Process Automation Center, Dallas
Lines: 23
 
> It is unfortunate I suppose that Mod-Tap Inc. decided to use RJ-11
> connectors to run RS-232.  They have been selling there cabeling
> stuff for quite a while now, and it it quite popular.  I suppose now
> the next thing we'll see is terminal manufacturers putting rj-11's
> on the back of there terminals for RS-232, and when you accidently
> plug a phone line into it--Blamo!--a $200.00 repair!
> -Mike
 
A well-engineered terminal should cope with this.  Something as simple
as 2 12-volt Zeners plus a 200 ohm resistor across what is usually the 
"ring/tip" pair would probably suffice to protect the terminal.  As to
what this would do to USTelco systems, I don't know.
 
Disclaimer:  I am neither a licensed telephone repairman, nor do I possess
	     a formal EE degree (mine is M-CS-SD).  Any statements made
	     herein are (off-the-top-of-my-head) opinions, and should
	     NOT be construed as recommendations.
 
-- 
Russell Kent			Phone: +1 214 995 3501
Texas Instruments - MS 3635	Net mail:
P.O. Box 655012			...!{ihnp4,uiucdcs}!convex!smu!tifsie!kent	
Dallas, TX 75265		...!ut-sally!im4u!ti-csl!tifsie!kent