You don't need a ring to use token passing protocols.
There are some token passing protocols implemented
on bus structures (IEEE-802.4 (token bus), PROFIBUS, ...)
Just my 2c
Gerold
Am Di, den 29.01.2008 schrieb dwight elvey um 16:15:
HI
With a ring, you could use a token but that would require
a master to start things and restore the ring when it was broken.
...
Dwight