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Fault-Tolerance of Dynamic-Full-Access Interconnection Networks

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2 Author(s)
Shen, J.P. ; Department of Electrical and Computer Engineering, Carnegie-Mellon University ; Hayes, J.P.

A β-network is an interconnection network composed of 2 ×2 crossbar switches called β-elements. This paper presents an analysis of the fault-tolerance of β-networks. A fault model is specified which allows β-elements to be stuck in either of their two normal states. A new connectivity property called dynamic full access (DFA) is introduced which serves as the criterion for fault tolerance. A fault is called critical if it destroys the DFA property; otherwise, it is noncritical. A minimal critical fault (MCF) is a critical fault none of whose proper subsets constitutes a critical fault. Two graph-theoretical characterizations of the minimal critical faults and the noncritical faults of a β-network are presented. Some applications of the theory developed here are discussed.

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Computers, IEEE Transactions on  (Volume:C-33 ,  Issue: 3 )