Multiplex communications – Wide area network – Packet switching
Patent
1992-09-04
1995-09-05
Beausoliel, Jr., Robert W.
Multiplex communications
Wide area network
Packet switching
370 16, G06F 1120, H04J 116, H04J 314
Patent
active
054487200
ABSTRACT:
An information processing system includes a simplex system and a duplex system in which at least two data transmitting systems are provided each capable of being an act system or a standby system. Each data transmitting system has a data acquiring unit. The simplex system includes a controller for controlling a selector to switch between the systems. When in a standby condition, the data acquiring unit of the respective data transmitting system in the duplex system issues an access request signal to a switching signal generating unit provided in the controller of the simplex system to request that the output of the selector be switched from the act system to the standby system in the duplex system. Upon receipt of the access request signal from the data acquiring unit in the standby system, the switching signal generating unit switches the selector to the standby system. As a result, status data acquired by the data acquiring unit in the simplex section is output to the data acquiring section in the standby system. The duplex system uses the status data to make a diagnosis of the standby system for its normality.
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Uchida Yoshihiro
Uriu Shiro
Yoshimura Shuji
Beausoliel, Jr. Robert W.
Fujitsu Limited
Vales Phillip F.
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