The architecture of a highly reliable systolic correlator array which forms part of a family of devices sharing a common cell architecture is outlined. The design of the cell is novel, and the reliability characteristics are scalable across the family to provide defect and fault tolerance. This is achieved by using an interconnection harness, which effectively straps or links only the healthy cells of the array into a working structure. The correlator array is designed to operate at a constant throughput rate, allowing a dynamic selection of the precision of correlation coefficients. A tradeoff between the precision of coefficients and latency of the array, as well as between the precision of coefficients and size of the correlation template, is possible. This makes the family of devices highly flexible and suited for a wide range of applications.>

Many virtual circuit service communications networks such as SNA employ virtual circuit transmission method inside the subnet. An essential feature of such networks is that the sequence in which messages are transmitted is maintained throughout the route from source node to the destination node. When there are multiple links connecting two intermediate nodes in the route and the messages are of different lengths, then it is possible that the messages complete transmission at the next node out of sequence. These messages then have to be resquenced, i.e. put in the right order, in order to provide a virtual circuit service. The resequencing operation introduces an additional delay in transmission which may be significant. In this paper the probability distribution of the resequencing delay is obtained for the M/M/m system. Simple expressions for the mean and coefficient of variation of the resequencing delay are also provided. It is shown through a variety of numerical examples that the resequencing delay is likely to be a significant component of the overall response time. Some interesting aspects of dependence of the mean resequencing delay on system parameters are studied analytically.