On Mon, May 18, 2009 at 11:48 AM, Jake Gardner <[email protected]> wrote: > If you're just looking to pick up an extra port. You can just rewire one > cable with 2 heads. I've done this before and it does work, however there > is high probability that you'll never sync at gigabit ...
s/high probability/absolute certainty/ Gigabit uses all four pairs. Previous iterations of Ethernet-over-twisted-pair uses only two pairs, so it can work for 100 and 10 megabit. As you mention, interference between two Ethernet links in such close proximity can be an issue. How likely that will be depends on the length of the run. A short run can withstand more than a long run, because a long run has already eaten up more of the margin for error... I'm not sure if PoE requires all four pairs or not. I know some PoE designs for 10/100 used the other two pair for power, separate from the signal pairs. But PoE is also possible over gigabit, so it must be possible to supply power on signal pairs. Perhaps it is also possible to supply power on just two pairs. I dunno. -- Ben ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
