Redundant system having signal path operation function

In a redundant system comprising:

• a redundant structure having an output side, said redundant structure comprising:
• a plurality of parallel connected systems each including a plurality of circuit packages through which signal paths are formed;
• and
• a selector connected to said signal paths provided on the output side of said redundant structure,
• the selector selecting a signal path from one of said signal paths formed in the parallel connected systems and generating selection information indicative of one of selection and non-selection of each signal path;
• a method of path operation comprising the steps of:
• generating path operation information indicative of one of operation and non-operation of each signal path in each of the parallel connected systems, based on said selection information indicative of one of selection and non-selection of each signal path generated by the selector;
• transferring the path operation information from a first circuit package to a second circuit package in a direction reverse to that of a flow of associated signal paths in each of the parallel connected systems;
• and
• judging path operation condition of the signal paths passing through each circuit package based on the transferred path operation information.

A redundant system comprising:

• a redundant structure comprising:
• a plurality of connected systems each including a plurality of circuit packages through which signal paths are formed;
• and
• a selector connected to said signal paths for selecting a signal path and generating selection information;
• generating means for generating path operation information indicative of one of operation and non-operation of each signal path, based on said selection information;
• and
• control means provided in each said circuit package for transferring said path operation information from a first circuit package to a second circuit package in a direction reverse to that of a flow of associated signal paths and for judging path operation condition of the signal paths passing through each circuit package based on said transferred path operation information.