[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: Linksys EtherFast NIC, full duplex?

On Wed, May 09, 2001 at 04:26:42PM -0500, Rich Puhek wrote:
> You are on the right track. In half-duplex, the card basicly listens on
> its receive line while it's "talking" on the transmit line. Normally, in
> a non-switched, half-duplex, environment, only one card may transmit at
> any one time. If the card hears anyone else transmit during the time
> it's transmitting, it treats that as a collision. It will transmit a
> signal indicating a collision (which the hub will relay to all ports),
> and sleeps for a random time interval (the holdoff time is based on an
> interesting algorithm that makes the possible interval wider, depending
> on the number of collisions the card has seen).

Er, the number of collisions seen while transmitting this packet.

Note that 16 consecutive collisions cause the packet to be dropped (an
"Excessive Collission).  It's now up to the layer 3 protocol to solve
the problem ...

Nathan Norman - Staff Engineer | A good plan today is better
Micromuse Ltd.                 | than a perfect plan tomorrow.
mailto:nnorman@micromuse.com   |   -- Patton

Attachment: pgpgCpna9wKHq.pgp
Description: PGP signature

Reply to: