ISDN Vs. Cable Modems

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Cablevision and Performance Systems International (PSI)
jointly developed PSICable, an Internet access service deployed over upgraded
cable plant in Cambridge, Massachusetts;

� Internex, Inc. began selling Internet access over ISDN telephone
circuits available from Pacific Bell. Internex's customers are residences and
small businesses in the "Silicon Valley" area south of San Francisco, California.


2.0 The Internet

When a home is connected to the Internet, residential communications
infrastructure serves as the "last mile" of the connection between the home
computer and the rest of the computers on the Internet. This section describes
the Internet technology involved in that connection. This section does not
discuss other aspects of Internet technology in detail; that is well done
elsewhere. Rather, it focuses on the services that need to be provided for home
computer users to connect to the Internet.

2.1

ISDN and upgraded cable networks will each provide ...

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Data
transmissions are generated by computer applications. Not only do existing
applications change frequently (e.g. because of software upgrades), but entirely
new categories�such as Web browsers�come into being quickly, adding different
levels and patterns of load to existing networks. Researchers can barely measure
these patterns as quickly as they are generated, let alone plan future network
capacity based on them.

The one generalization that does emerge from studies of both local and wide-
area data traffic over the years is that computer traffic is bursty. It does
not flow in constant streams; rather, "the level of traffic varies widely over
almost any measurement time ...

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