Fault tolerance analysis of odd-even transposition sorting networks

Sorting networks are important hardware and software models of parallel sorting operations. They have several applications such as ATM switching, distributed processing, and optical implementation of sorting. In this paper we investigate the fault-tolerance properties of a special class of sorting networks called the odd-even transposition sorting networks. These networks have a simple and reliable hardware structure, which is easy to implement with VLSI technology. A simulation program of these networks´ operation has been developed in C++. The simulation results revealed two important properties of odd-even transposition sorting networks: Any single stuck-at-X fault occurring in an internal comparator is redundant. And any two stuck-at-X faults occurring in a large number of internal comparators is redundant