17-6 Industrial Communication Systems
was demonstrated that the use of priorities for packets in the communication infrastructure is not
on its own sucient to guarantee that application-to-application deadlines will be met and that the
concept of priority has to be extended to the end nodes in the protocol stack. Other works dealt with
limitations of switched Ethernet as far as real-time communication is concerned [Jas02]. In [LoB06], a
signicant reduction in the roundtrip delay for high-priority trac is obtained thanks to an approach
based on both a prioritization mechanism in the protocol stack and multiple reception and transmis-
sion queues in the end nodes.
Many
networked
real-time
systems
feature
applications
with
further
requirements ...