Jim Martin, Mike Westall
نویسندگان
چکیده
The number of households and businesses using HFC cable networks for Internet access is rapidly approaching 40 million in the United States. The cable industry has standardized on a single MAC and physical layer standard, the Data Over Cable System Interface Specification (DOCSIS). The emerging IEEE 802.16 broadband wireless access MAC protocol is based on DOCSIS. We have implemented a simulation model of the DOCSIS MAC using the ‘ns’ simulation package. In this paper we provide analytic and live network evidence that the simulation model is correct. To demonstrate the model, we provide the results of a brief simulation-based performance evaluation designed to provide insight as to how a best effort VoIP service (e.g., Vonage) performs under varying traffic loads compared to a VoIP service that utilizes DOCSIS QoS mechanisms. Keywords— Simulation, Broadband Access, HFC Cable Networks, TCP Performance A. INTRODUCTION The increasing use of broadband DSL and cable access networks is a major driver of the continuing robust growth of the Internet. According to a PEW survey, nearly 65% of adults in the United States access the Internet at least once each day [8]. There are 66 million households equipped with broadband access, and that approximately 54% of these households use cable.
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