Patent ID: 7116633

Claim:
A redundant system having two switch routes, comprising: N, with N greater than or equal to one, input selectors, each for receiving an input line and for connecting the received input line to one of the two switch routes based on a system switching signal; a switch section for each one of the two switch routes, each of the switch sections having N input ports and N output ports, and N buffers that each further include M, with M greater than or equal to two, priority queues for storing packets having different priorities; an output selector for selecting one of the M priority queues from one of the N buffers of one of the two switch sections; and a controller configured to receive status signals from both of the switch sections that include information relating to a packet storing status of the M priority queues and, based on the status signals, control the output selector to select the one of the M priority queues, the controller additionally generating the system switching signal.