The Public Switched Telephone Network is designed to be available 99.999% of the time.

Question

Quizplus · Accepted Answer

The Public Switched Telephone Network (PSTN) is designed to have a high level of availability and is typically engineered to be available 99.999% of the time, which is known as "five nines" reliability. This level of availability is achieved through network redundancy, backup power supplies, and other measures to ensure that the network is always available to users.

The Public Switched Telephone Network Is Designed to Be Available