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High Availability Network Fundamentals by Chris Oggerino

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The Small Internet Service Provider Network

The focus of the chapter is to perform the tasks involved with predicting availability figures for a small Internet service provider network. As you have seen, this will require several steps. In this section, we will define the network, make our assumptions, and determine the scenarios we want to analyze.

The network on which we are going to perform our calculations resembles a small service provider for modem and ISDN dialup customers. The equipment used is a little bit more than would be required for this particular network but would enable a lot of growth. End customers use either a modem or an ISDN router to dial up the ISP. Their calls are routed via twisted pair into their local PSTN. The calls ...

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