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A Model for Evaluating the Performance of an Integrated Circuit- and Packet-Switched Multiplex Structure

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2 Author(s)
Fischer, M. ; Defense Comm. Agency,Def. Comm Engr.Center,Reston,VA ; Harris, T.

Recent papers have introduced a multiplexing structure for mixing voice and data traffic in an integrated telecommunications system. This structure utilizes a master frame format of a time division statistical multiplex facility. A certain portion of the frame is allocated to voice calls, and data traffic is assigned to the remaining frame capacity. To achieve a high transmission utilization, data are allowed to use any residual voice capacity momentarily available due to statistical variations in the voice traffic. The voice traffic is treated as a loss system and data packets are buffered. In this paper we derive exact analytical expressions for the key system perfomance measures, the probability of loss for voice calls, and the expected waiting time for data packets. Actually, two cases are considered, the one discussed above, called the movable boundary case, and one where the boundary is fixed; i.e., data are not allowed to utilize the residual voice capacity. The computational aspects of calculating actual numbers are discussed in some detail, and results are presented for typical cases.

Published in:

Communications, IEEE Transactions on  (Volume:24 ,  Issue: 2 )

Date of Publication:

Feb 1976

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