Abstract
Abstract This paper describes an enhanced distributed queueing protocol called Dynamic Distributed Dual Queue (D3Q). This protocol incorporates destination release and request cancellation. Therefore D3Q allows reuse of channel capacity and is suitable for both bus and ring architectures. After that, Multirequest D3Q (MD3Q) is introduced, which is an enhanced version of D3Q incorporating multiple outstanding requests. This protocol version includes new features for guaranteeing bandwidth to a node and for supporting multiple priorities. MD3Q is not merely an enhancement of D3Q or DQDB but rather a generalisation for Distributing Queueing (DQ) protocols. The described methods of bandwidth re-use and guarantee of bandwidth can be generally applied to all kinds of distributed queueing protocols. By using only 4 bits for the access protocol and supporting multiple levels of priority, this protocol is very suitable for performing Generic Flow Control (GFC) at the ATM User-to-Network Interface (UNI), where it is currently being studied further in CCITT SG XVIII.
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