From: Hansang Bae (hbae@xxxxxxxxxx)
Date: Tue May 07 2002 - 01:09:46 GMT-3
At 08:21 PM 5/6/2002 -0400, Peter van Oene wrote:
>[snip]
>In full duplex Ethernet, separate Tx and Rx paths are defined which thereby cr
eate a collision free environment. Hence, collision detection becomes irreleva
nt and actually impossible in these cases. Collisions in half duplex are expec
ted, though should not exceed 5-10% of total capacity in healthy (highly subjec
tive term) networks.
Collisions in a half-duplex CSMA/CD world are a fact of life. It is a COMPLETE
LY, UTTTERLY USELESS metric to keep track of. Keep in mind that a fast station
is pretty much GUARANTEED to generate one collision for every two frames that
it sends out during an ftp transfer (the returning ACK will collide with the ne
xt packet queued up to be sent)
If you do the math, you lose VERY VERY little banwidth due to collisions. They
are simply not worth worrying about.
hsb
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