Under CSMA/CA signaling, a computer sends out a jam signal to indicate it's desire to transmit on the wireless network. What if multiple machine send out a jam signal at the same time. Is there some kind of ack that comes back in response to the jam signal that tells a node that it has permission to send?
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How do CSMA/CA jam signals work?
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Gary,
The CSMA/CA on a wireless doesn't prevent collisions...I know strange,right. In a wireless, when two devices send out the jamming signal simultaneously, they will hear each other's jamming and do the default behavior--both computers will stop trying to send a jam and wait a random period of time before trying to send a jam again indicating it's readiness to transmit. So no ACK is needed.
Now, even though an ACK is not required before two computers try to resend. In a wireless scenario, transmission collisions are minimized because every transmission requires an ACK. When the sending device doesn't receive an ACK, it will re-transmit the last transmission again. This is because no ACK indicates a failure in the transmission.
Cordially,
Ronnie Wong
Host, ITProTVCordially,
Ronnie Wong
Edutainer Manager, ACI Learning [ITPRO]
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