Abstract
Frame relaying is a new CCITT-recommended packet mode bearer service in ISDNs for data communications. Its major characteristics are out-of-band call control and link layer multiplexing.Requirements for the interworking between frame relaying services are the support for a multi-network, multi-vendor environment, and the integration of call control. After a comparison of the service characteristics of packet switching, circuit switching, and frame relaying, we conclude that the inter-nodal interworking strategy meets these requirements better than the internetwork interworking strategy.To understand better the requirements of a network architecture for the provision of frame relaying service, and to lend support for the standardization of the inter-nodal interworking strategy, a preliminary view on the functional structure of a network node is presented.

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