k2@charly.bl.physik.tu-muenchen.de (Klaus Steinberger) (06/27/90)
bob@kahala.soest.hawaii.edu (Bob Cunningham) writes: >Would someone who knows please say what the difference is between >MMJ and RJ12 jacks? >I have to specify for some terminal server-related equipment. I THINK >they're both 6-wire modular jacks (similar to the 4-wire RJ11), but >if that's true, I can't figure out what the difference would be >between them. >thanks, 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. Sincerely, Klaus Steinberger Klaus Steinberger Beschleunigerlabor der TU und LMU Muenchen Phone: (+49 89)3209 4287 Hochschulgelaende, D-8046 Garching, West Germany BITNET: K2@DGABLG5P Internet: k2@charly.bl.physik.tu-muenchen.de
DHWalker@uci.edu (David Walker) (06/29/90)
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