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From: DHWalker@uci.edu (David Walker)
Newsgroups: comp.dcom.lans
Subject: Re: MMJ vs. RJ12?
Message-ID: <268AB137.21620@orion.oac.uci.edu>
Date: 29 Jun 90 01:39:03 GMT
References: <8398@uhccux.uhcc.Hawaii.Edu> <3102@tuminfo1.lan.informatik.tu-muenchen.dbp.de>
Organization: University of California, Irvine
Lines: 21

In article <3102@tuminfo1.lan.informatik.tu-muenchen.dbp.de> 
k2@charly.bl.physik.tu-muenchen.de (Klaus Steinberger) writes:
> >Would someone who knows please say what the difference is between
> >MMJ and RJ12 jacks?
 ...
> The only difference is, that the locking nose is assymmetric
> on the MMJ, and symmetric on the RJ12. So you can't plug a RJ12
> into a MMJ, and vice versa.

Right.  We used to use MMJ jacks, but switched to RJ12.  The advantage of 
MMJ jacks is that you can't plug-in something (like a phone) that 
shouldn't be there.  The disadvantage is that you can't plug-in something 
(like Farallon PhoneNet) that wasn't intended to be there.  The RJ12 jack 
gives you much more flexibility, and it can also accept RJ11 plugs without 
modification.


                               David Walker
                               Network Services Manager
                               UC Irvine
                                 DHWalker@uci.edu