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Overview
Availability refers to the capability of providing services at any time. It is a common indicator used to measure the reliability and usability of telecom products.
Availability is determined by the reliability and maintainability of the equipment and it is represented by A = MTBF/(MTBF + MTTR), in which:
- MTBF: mean time between failures, a measure of equipment reliability
- MTTR: mean time to repair, a measure of equipment maintainability
Depending on the network position, different telecom products are designed with different availabilities, which are generally 0.999, 0.9999 or 0.99999, but can be even higher. Table 6-1 describes availability requirements.