Telefax in local area networks

The integration of group 4 facsimile in local area networks (LANs) based on carrier-sense multiple-access with collision detection (CSMA/CD) is studied. A simulation program yields performance characteristics such as message and packet transmission delays, channel access delays and average throughput. Traffic on the LAN is modeled by group 4 fax generators and so-called base load generators. Both classical Poisson processes and interrupted Poisson processes are studied. A comparison of the simulation results shows the impact of the kind of base load generation on facsimile service. The sensitivity to the intensity of the generated facsimile and base load and to flow control mechanisms implemented on logical link control (LLC) or transport layer is evaluated