Performance and reliability of DQDB metropolitan networks underfaults

摘要

The authors investigate the performance and reliability of a DQDB(distributed queue dual bus) metropolitan area network underintermittent and stuck-at-fault nodal error conditions. The analysis isrepeated with triple modular redundancy and quintuple modular redundancyapplied to specific circuitries with the network node. The Weibull modelis used to investigate the degradation of the network due to a singlefalling node. The results show these circuits within the user node whereforward error correction gives a greater immunity of the whole networkagainst faults. The authors clarify the close interaction between thenetwork multiprocess protocol and the error sensitivity of variouscircuits and the aging effects of circuits on the performance, whichaffects the renewal rate. It is pointed out that this provides anentirely new concept and criterion for selecting protocols for widebandISDN (integrated services digital network) networks