nfrastructure. 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 infrastructure. It then discusses a topic not covered much in the literature, namely, how this infrastructure can be used to provide Internet access. It concludes with a qualitative evaluation of the advantages and disadvantages of cable-based Internet access. While ISDN is extensively described in the literature, its use as an Internet access medium is less well-documented. This chapter briefly reviews local tel...
