Token Frame in 802.5
Start Frame Delimiter (JK0JK000) [1 octet]
Access Control (PPPTMRRR) (T=1 for token frame) [1 octet]
End Frame Delimiter (JK1JK1IE) [1 octet]
In the End Frame Delimiter …
I=1 in a single frame or the last frame of the series; otherwise set to 0
E=0 initially; Set to 1 by any station detecting an error