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7292897 Multiplexing control system and multiplexing method therefor  
A multiplexing control system has a common process input/output unit for distributing process signals from sensors for measuring the same state variable of a process to digital controllers. One...
6717909 Ethernet protection system providing fault tolerence for communication lines and interface cards according to classified failure states  
An Ethernet protection system includes an Ethernet communication device operable to be connected to first and second Ethernet lines forming a parallel connection. The Ethernet communication device...
6693874 System and method for enabling fault tolerant H.323 systems  
An H.323 client terminal ( 102 ) according to an embodiment of the invention employs primary and secondary H.323 control units or state machines ( 110 a , 110 b ). The primary control unit ( 110 a...
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