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- Path: sparky!uunet!gumby!wupost!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!telecom-request
- Date: Sat, 29 Aug 92 21:11 EDT
- From: rsiatl!turner@rsiatl.UUCP
- Newsgroups: comp.dcom.telecom
- Subject: Re: Is RJ45 With Notch Same as RJ45 Without Notch?
- Message-ID: <telecom12.670.8@eecs.nwu.edu>
- Organization: TELECOM Digest
- Sender: Telecom@eecs.nwu.edu
- Approved: Telecom@eecs.nwu.edu
- X-Submissions-To: telecom@eecs.nwu.edu
- X-Administrivia-To: telecom-request@eecs.nwu.edu
- X-Telecom-Digest: Volume 12, Issue 670, Message 8 of 12
- Lines: 29
-
- > Actually, they both have notches, but the DEC connector (called an
- > MMJ) has the notch offset while the standard RJ-45 has it centered. If
- > you have MMJ hacks installed in offices you will need MMJ plugs for
- > them. The RJ45 will not work.
-
- > The jacks are the same, except for the notch. The difference is in
- > the cable. A standard no-notch RJ-45 cable is wired with a twist, so
- > that pin one is connected to pin eight on the other end. A notched
- > cable is wired straight.
-
- Actually two different connectors are being discussed. The MMJ is a
- six conductor modular plug whose top "key" (with the locking lever) is
- offset so it is asymetrical when viewed from the front. As the first
- author said it uses RJ type modular plugs.
-
- The RJ 45 is a eight conductor version of the RJ11, with an enlarged
- "shell" and is available in both keyed and unkeyed versions. The
- latter is usually used for voice telecommunications, and often for
- data as well. The unkeyed versions will fit either jack. As the
- second author stated analog RJ45 cables and unigender connectors are
- crosspinned (1-8, 2-7, 3-6,..). Dcom cables are straight pinned.
-
- RJ11/12/14's will plug into a keyed or unkeyed RJ45 jack, usually w/o
- any problem.
-
-
- Pat Turner KB4GRZ turner@dixie
-
-