Token priority mechanism.

I'm reading Token Ring Network(IEEE802.5), and, I have many troubles on Token Priority, so the members can show obviously to me some examples and on this access method.
Thanks for reading. Thanks everyone.

As the name says: " Token Ring" the topology is a kind of Ring. Then in this ring we have a message (called token) which goes around the ring. As it arrives to a host, if it had anything to send, it sends its packet and also passes the token to its neighbor. If it didn't have anything to send, it just passes the token to its neighbor. The key property of Token Ring is: just when you have the token, you can send.
That's it