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Performance of Integrated Packet Voice/Data Token-Passing Rings

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2 Author(s)
Karvelas, D. ; Univ. of Toronto, Toronto, Ont., Canada ; Leon-Garcia, A.

This paper presents performance results that indicate that packetized voice service can be provided on a token-passing ring without adversely affecting the performance of data traffic. This is accomplished by introducing a relatively mild priority structure: stations are limited to a single packet transmission per medium access, and voice packets are given access priority over data packets at the same station. In addition, voice traffic is allowed longer packet lengths than data traffic. Several versions of this basic scheme are considered: 1) the number of active stations is constrained so that voice packets are guaranteed access within one packetization period, 2) no guarantee on access time is provided and voice packets are discarded when the waiting time exceeds one packetization period, and 3) no guarantee on access time is provided and voice packets are buffered until they can be transmitted.

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Selected Areas in Communications, IEEE Journal on  (Volume:4 ,  Issue: 6 )