Token Ring Standard (IEEE 802.5)
unsheilded twisted pair = 4 Mb/ s, sheilded twisted pair = 16 Mb/ s
differential Manchester encoding
3 byte token, variable length data frame
control fields, eg, access control (ac):
- token bit: turns token into a frame! "grab token"
- priority bit: priorty of token
- if frame to send has less priority, then can't grab the token
- reservation bit: tries to reserve the next token by setting the priority