Performance studies on LAN/MAN‐BISDN interworking have mainly focused on the requirements of isochronous and connectionless services. In this paper we extend performance results to cover also the case of non‐isochronous connection oriented (CO) services supported by the queued arbitrated (QA) mode of access of the DQDB protocol. Using this case we stress the more general issue of service integration impact on the interworking unit (IWU) architecture design in terms of protocol stacks and expected performance. We herein evaluate the performance of IWU architectures tailored to relay information in the lowest possible layer while implementing several service priority schemes and buffer management policies towards QoS objectives. The conditions under which the IWU design is efficient regarding performance, protocol complexity and implementation cost in this integrated services environment are identified.
A comparative study of the Distributed Queue Dual Bus (DQDB) and ATM Passive Optical Networks (APONs) is presented with emphasis on their application as access multiplexers to B-ISDN, offering traffic concentration and resource sharing. In this capacity, their performance impacts greatly on the quality of the demanding broadband services. This study is based on computer simulation using a novel modelling solution allowing the simulation to be distributed among a few workstations interconnected via a TCP/IP LAN. The performance comparison shows that DQDB offers lower Cell Delay Variation (CDV) and much lower mean delay although not equally well-bounded. This makes it a prominent candidate for the access role of customers requiring a high degree of quality. On the other hand, the APON, which was introduced with an aim to share the medium and the Optical Line Terminator (OLT) transceiver among a cluster of customers, presents a slightly worse but also acceptable performance in comparison with DQDB.
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