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High Availability Network Fundamentals by Chris Oggerino

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Determining the Availability of Network Device Components

In order to calculate the availability of a network, you have to calculate the availability of the individual network devices comprising it. And in order to calculate the availability of a network device, you have to calculate the availability of its components. The calculation of the availability of the devices' components is the starting point of the mathematics of availability.

Cisco Systems uses what is called the Telcordia (formerly Bell Core) Parts Count Method. The Parts Count Method is described in Technical Reference document TR-332, “Reliability prediction procedure for Electronic Equipment” from December 1997.

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In order to avoid the complex mathematics that created the need ...

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