Polynomial testing of packet switching networks
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A functional testing method called polynomial testing is proposed to test packet switching networks (PSN's) used in multiprocessor systems. For the purpose of concreteness, we focus on applying the method to packet switching multistage interconnection networks (PMIN's). A multiple stuck-at (MSA) fault model is developed first, and then faults are diagnosed at two different levels: network level and switch level. The former uses each processor as a tester and can test part of the network concurrently with the normal operations on the remaining part of the network. On the other hand, the latter uses switches in the network as testers and is inherently an autonomous testing method. To facilitate the network level testing, the routing dynamic in a PMIN is eliminated by synchronizing switch operations. The network is then decomposed into routes, each of which is tested after transforming it into a polynomial calculator. For switch level testing, a built-in tester (BIT) is embedded into each switch's structure to provide self-testing capabilities. Network level testing is distributed and suitable for concurrent testing, whereas switch level testing is off-line with a small testing time. 1989 IEEE
