ovided cost-effectively. In contrast, the dynamic sharing enabled by cable's bus architecture can, if the statistical aggregation properties of neighborhood traffic cooperate, give a customer access to a faster peak data rate than the expected average data rate. 2.2 Why focus on Internet access? Internet access has several desirable properties as an application to consider for exercising residential infrastructure. Internet technology is based on a peer-to-peer model of communications. Internet usage encompasses a wide mix of applications, including low- and high- bandwidth as well as asynchronous and real-time communications. Different Internet applications may create varying degrees of symmetrical (both to and from the home) and asymmetrical traffic flows. Supporting all of these properties poses a challenge for existing residential communications infrastructures. Internet access differs from the future services modeled by other studies described below in that it is a real application today, with growing demand. Aside from creating pragmatic interest in the topic, this factor also makes it possible to perform case studies of real deployments. Finally, the Internet's organization as an "Open Data Network" (in the language of (Computer Science and Telecommunications Board of the National Research Council, 1994)) makes it a service worthy of study from a policy perspective. The Internet culture's expectation of interconnection and cooperation among competing organizations may clash with the monopoly-oriented cultures of traditional infrastructure organizations, exposing policy issues. In addition, the Internet's status as a public data network may make Internet access a service worth encouraging for the public good. Therefore, analysis of costs to provide this service may provide useful input to future policy debates. 3.0 Technologies This chapter reviews the present state and technical evolution of residential cable network infrastructu...
