Ring stability of the PROFIBUS token-passing protocol overerror-prone links
Willig, A.; Wolisz, A.
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 5, Oct 2001 Page(s):1025 - 1033
Digital Object Identifier 10.1109/41.954567
Summary:The PROFIBUS is a well-known and widely used fieldbus. On the
medium access control layer, it employs a token-passing protocol where
all active stations form a logical ring on top of a broadcast medium.
This protocol is designed to deliver real-time data transmission
services in harsh industrial environments. A necessary prerequisite for
timeliness and quality of service is the ring membership stability of
the logical ring in the presence of transmission errors, since only ring
members are allowed to transmit data. In this paper, the ring membership
stability under high error rates and using different error models is
analyzed. The choice of the error behavior is in turn inspired by
properties of possible future transmission technologies, e.g., wireless
LANs. It is shown that the protocol has serious stability problems. To
attack these problems, two changes to the protocol and its parameters
are proposed, which can be implemented in a purely local manner. We show
that they significantly improve ring stability
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