architecture is one of the underlying technologies used by ATM networks. The SDH includes various protection mechanisms. One main design issue is probably the recon guration process in case of failure. In case of SDH works on optical bres with a ring network topology, the Automatic Protection Switching (APS) protocol can be used. This paper addresses the problem of maximum allowed recovery time in four bers ring architecture. We analyze the APS protocol and derive upper bounds for the processing time in each node of the network in order to cope with the maximum recon guration time of 50 ms, as speci ed in the standard. We nally analyze the behavior of the system in case of two interleaved failures. A worst case analysis is carried out, showing that a 100 ms recon guration time can be guaranteed.

In an ATM Customer Premises Network, there is ahantage in having shared access across the one Broadband User Network Interface (UNI). In this paper, we consider ATM shared access issues based on the GFC protocols as network support for multimedia communications, and we propose a mechanism for shared-medium access to an ATWB-ISDN network to support multimedia traffic. The access scheme proposed is based on direct access to a slotted medium on ring network. By installing insertion buffers at each station reduces media access time, and using spatial reuse by destination release procedure increases the throughput. The proposed Reset-Window with Buffer Insertion Protocol (RBI) includes multiple prioritized access to be able to transport multimedia communications. This access protocol is described and its performance is analyzed. The mean cell access delay and the fair sharing of the non-guaranteed bandwidth are evaluated by a simulation.

The present paper suggests both an ATM customer premises network architecture as an associated GFC MAC algorithm for the Broadband Customer Premises Network (B-CPN). This ATM local network incorporates a ring architecture and is based on a new class of shared-medium access protocol. The access control operates over an unidirectional slotted ring network with spatial reuse by destination release procedure. Under this access mechanism two levels of traffic with requested quality of service (QoS) are supported: real-time and nonreal-time traffic. This access protocol is described and its performance, is analyzed.

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In this paper, we present a system architecture for supporting Real-time Multimedia Document Distribution Applications. This architecture is based on an extended version of the ODA (Office Document Architecture) standard using as communications support the IEEE 802.6 MAN Standard: an integrated services local area network (ILAN). Multimedia document delivery is performed by dynamically allocating the network bandwidth. This allocation strategy is based on the bandwidth required by the various media composing the documents. A performance analysis of the proposed bandwidth allocation scheme is given.