Token Format
Mostly token is the shortest frame transmitted (24 bit) MSB (Most Significant Bit) is all the time transmitted first - as opposed to Ethernet
SD = Starting Delimiter (1 Octet) AC = Access Control (1 Octet)
ED = Ending Delimiter (1 Octet)
Starting Delimiter Format:
J = Code Violation
K = Code Violation
Access Control Format:
T=Token
T = 0 for Token
T = 1 for Frame
When a station have a frame to transmit detects a token which has a priority equal to or less than the Frame to be transmitted, it could change the token to a start-of-frame sequence and transmit the Frame
P = Priority
Priority Bits indicate tokens priority. It shows which stations are allowed to use it. Station be capable of transmit if its priority as at least as high as that of the token.
M = Monitor
The monitor bit is used to prevent a token whose priority is greater than 0 or any frame from continuously circulating on the ring. If an active monitor found a frame or a high priority token with the monitor bit equal to one, the frame or token is aborted and this bit shall be transmitted as zero in all frame and tokens. The active monitor inspects and made some in this bit. All other stations shall repeat this bit as they get it.
R = Reserved bits
The reserved bits let station with high priority Frames to request that the next token be issued at the requested priority.
Ending Delimiter Format:
J = Code Violation
K = Code Violation
I = Intermediate Frame Bit
E = Error Detected Bit
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