More and more switched Ethernet were used to support high bandwidth real-time communication in process control, factory automation and other real-time applications. This paper first presents a comprehensive analysis of the temporal characteristics of the technologies like full duplex, congestion control, priority handling, VLAN, Spanning tree protocol, RSVP et al used by a switched Ethernet. These technologies enforce the high bandwidth real-time quality of switched Ethernet. At the same time this paper gives introductions of (m,k)-firm that specified QoS (Quality of Service) of switched Ethernet.
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