by "John P. Dearing" <John.Dearing@[EMAIL PROTECTED]
>
Dec 15, 2007 at 03:42 PM
Eddie wrote:
> One thing that I find confusing is that why do Token Ring networks use a
> Collision Sensing method (CSMA/CA)when collisions are impossible on this
> type of network?
Do you have some reference you can cite that claims this?
Everything I have seen seems to indicate that 802.5 Token Ring does not
need collision sensing because of the very nature of the token passing
protocol. Unless you have the free token you can't transmit. There is no
need to "check first" before transmitting.
Wikipedia has an excellent article on Token Ring.
http://en.wikipedia.org/wiki/Token_ring
And an article on CSMA/CA
http://en.wikipedia.org/wiki/Carrier_sense_multiple_access_with_collision_avoidance
Wireless networks use CSMA/CA to see if the channel is clear to transmit.
John
--
John Dearing
A+, Network+, Server+
To Reply: Just drop YOUR PANTS in my address! 8-)
