ATM TRAFFIC TRANSFER VIA QUEUED-ARBITRATED DQDB

The easy and cost effective interworking of Distributed Queue Dual Bus (DQDB) and Asynchronous Transfer Mode (ATM) protocols is of prime imp ortance for the evolution of the broadband integrated services digital network (B-ISDN) and the long-term success of MANs as tributary netwo rks. In this paper, we study several practically useful scenarios for the interworking of ATM Customer Premises Networks (CPN) through a tra nsit DQDB network. Suitable Interworking Unit (IWU) protocols are pres ented and compared. It is shown that the most advantageous solution in terms of service quality and IWU simplicity and robustness is the use of a Connection Oriented (CO) DQDB service exploiting the Queued-Arbi trated mode of access. Also, the provisions required in the definition of a CO DQDB service are pointed out. Finally, the implementation of an IWU applying the ideas presented is outlined.