Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!brutus.cs.uiuc.edu!apple!rutgers!dimacs.rutgers.edu!action.rutgers.edu!dpz From: dpz@action.rutgers.edu (David Paul Zimmerman) Newsgroups: comp.dcom.lans Subject: Re: 10Base-T and RJ-11 wiring? Keywords: 10Base-T, RJ-11 Message-ID: Date: 10 Aug 90 22:07:43 GMT References: <1990Aug9.185455.3488@portia.Stanford.EDU> <62372@bu.edu.bu.edu> Distribution: na Organization: Rutgers University DIMACS Lines: 48 > RJ-11 is set-up pairwise like so: > 3 2 1 1 2 3 > and RJ-45 is set-up pairwise like so: > 3 3 2 1 1 2 4 4 > We usually number the RJ-45 pins like so; > 1 2 3 4 5 6 7 8 Now I'm confused. I've set up my 10baseT environment under the idea that the RJ45 socket was pins 1 2 3 4 5 6 7 8 pairs 2 2 3 1 1 3 4 4 which translates on the closet 110 block to pairs 1 1 2 2 3 3 4 4 "pins" 5 4 1 2 3 6 7 8 and it works. I do believe your RJ-11 breakdown, though. >> In particular, we'd like to buy off-the-shelf twisted-pair jumper >> cables to connect between the RJ-45 connector on the computer's >> 10Base-T adaptor and the RJ-11 on the wall. Are these available from >> some place? Do they have a standard for how they make them up, or do >> people just custom-order? This isn't a cable, but you can get a frob from Brand Rex that you plug between your RJ45 and RJ11 that looks (from the catalog) like it will do the job. It is their part number BR850-MET/RJ25C. It claims to go pin 6 5 4 3 2 1 pair 3 2 1 1 2 3 female || X X male pair 8 7 6 5 4 3 2 1 pin 4 4 3 1 1 3 2 2 and from what I understand of 10baseT it should do the trick, if you do the closet appropriately. They also have a version of that with two female sockets. If neither will do the job, they still might be able to help you, custom or otherwise, esp for a large job. Brand Rex is in Connecticut, 203-456-1706. David -- David Paul Zimmerman dpz@dimacs.rutgers.edu Systems Programmer rutgers!dpz Rutgers Univ Center for Discrete Math and Theoretical Computer Science (DIMACS)