John Oliver wrote:
On Wed, May 31, 2006 at 11:02:24PM -0700, Stewart Stremler wrote:
begin quoting John Oliver as of Wed, May 31, 2006 at 07:42:04PM -0700:
[snip]
At least Ethernet patch cables you can buy as 3', 5', 7', 10', 14', 25',
etc.
And 1' and 2' lengths, too.
This might have changed, but years ago, the Ethernet spec called for a
minimum length of 1 meter. I know shorter cables work, but I tend to
always use or make cables at least 3' long.
That spec was only for the coaxial cable, not the twisted pairs. The
reason for the length limit was that the pulse had to go out and give
some time to listen for collisions (The Collision Detection in CDMA).
With twisted wire pairs, the send and receive are decoupled. There may
be some problems with a hub, but a switch makes them essentially
independent.
Gus
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