Integrated voice/data services on Fasnet

Fasnet is a high-speed local area network with a pair of unidirectional communication channels. While individual stations control their own access to the medium, global scheduling of the medium for various types of traffic is controlled centrally. Centralized scheduling permits a slot to be endowed with a type, so it is feasible to integrate synchronous and asynchronous traffic services on Fasnet. In this paper we describe a policy for admitting new voice calls into the system and an approximate analysis of the queueing behaviour of data packets in an integrated voice and data services environment. Queueing behaviour can also be studied by means of simulation, which is, however, an expensive undertaking, particularly at high transmission rates, for example, at 100 Mb/s. The approximate method described in this paper allows the performance evaluation for high-speed local area networks.