Re: Doubling 100MBit ethernet by splitting the cable
"Grzegorz B. Prokopski" <gadek@debian.org> writes:
> Long time ago I've read that 100mbit ethernet uses only 2 pairs
> which leaves half of wires unused and thus when there's such a
> need - these can be used to create second 100mbit connection
> on the same cable (and connect second computer w/o the need of
> another cable).
I know this is the case for 10base-T, and I've tried to build cables
this way; I don't know quite enough about 100 mbit Ethernet to try.
> I've googled quite much and I am sure that's possible (with all
> doubts that it's non-standard solution etc.) [0]. But I still
> can't find good description (with images/asciiart preferred) of
> how to do this exactly?
Take the cable. You can get bulk 4-pair twisted-pair cable if you're
doing lots of this sort of thing; otherwise, cut the ends off the
existing cable. Cut the outer jacket open. Using loose RJ-45 ends
and a crimping tool, put two pairs into each end, using the positions
for pairs 2 and 3 only (pins 1, 2, 3, and 6 on the connector). You
might look at e.g. http://www.netspec.com/helpdesk/wiredoc.html to see
what the "normal" wiring is.
This will give you two separate Ethernet connectors, on the same
cable. But you're not going to find an Ethernet card that has two
NICs that use the same cable; you'd need to come up with a second
card. For that amount of money, you'd have far less pain just buying
a hub and a second cable.
--
David Maze dmaze@debian.org http://people.debian.org/~dmaze/
"Theoretical politics is interesting. Politicking should be illegal."
-- Abra Mitchell
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