Date: Sun, 6 Aug 1995 19:04:16 -0400 (EDT) From: rhh@elmer (Randall Hopper) To: questions@freefall.cdrom.com Subject: (?) RJ45 Crossover Cable Question (Pin numbering) Message-ID: <9508062308.AA22853@elmer.ct.picker.com>
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In short, does someone know the convention for numbering the pins on an
RJ45 cable connector? If the cable w/ attached connector is held in front of
you, pins on the near side of the connector and pointing up (cable attached to
the bottom), are the pins 1-to-8 numbered ascendingly from left-to-right or
right-to-left?
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The more detailed version:
I recently purchased an ethernet board for my FreeBSD box and am having
trouble getting it to talk to my router. I suspect that the cable might be
the problem.
The cable (custom made by someone else) is supposed to be an RJ45
crossover cable which I'll use to direct-connect to my home router. I've
buzzed it out to verify that pins 1-3 and 2-6 are swapped. If the answer to
the numbering convention question above is right-to-left, they are. However,
given that it isn't working and my board appears to be working fine except that
it can't put a packet on the network, I suspect that the the convention is
in-fact left-to-right, and the person that built the cable cabled it backwards.
If someone knows which is correct, please drop me some e-mail.
Thanks in advance.
Randall Hopper
rhh@ct.picker.com
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