Collisions

Hello. I have a short question on CSMA/CD collisions. When there is a collision, the first host that discovers it will send a Jam signal. Does this go to all hosts on the network, or just the one he collided with? Also, during the backoff time. Are other hosts on the network allowed to transmit?

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trackit

if you send a jam signal on a wire, then there is no way other devices that are connected to the exact same wire can transmit anything. Its not like there can be destination address on a jam signal...

the jam signal jams the wire, affecting the whole collision domain.

the random backoff affects all transmitters.

inc0mplete

Thank you ^^

trackit

you are welcome

bigheadx

A bit more for you;

Carrier Sense Multiple Access / Collision Detection works like this.

Host A is Tx, Hosts B, C, and D listen.

If there were a collision, the hosts involved would creat a JAM signal. All other hosts would not be able to send.

The backoff algorithm would kick in and, who ever has the lower number will be able to send first.

Hope this helps!

wastedtime

Is it just me or does this put a picture in your mind of your computer playing "Rock, Paper, Scissors" over the network?

bigheadx

Its more like a bunch of Fat dudes running into each other, bouncing back, and who ever flys the least amount of distance, will get the cake first.