Chapter 3
3.22 Hardware Designed to Tolerate a Single Point of Failure
Practice Statement:
The 811 center uses fault-tolerant hardware for its critical path operations, such as ticket taking, database access, and ticket delivery.
Practice Description:
A fault-tolerant system can withstand any single hardware malfunction without any interruption or degradation of service. These systems have the ability to identify the malfunctioning hardware component and permit its replacement while remaining online and processing normal applications. These fault-tolerant systems maximize the probability that the 811 center will be able to properly process an excavation request in the event of a failure or malfunction.
References:
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“Model One Call for the 20th and 21st Century,” AT&T (was available when the practice was created but is no longer available)
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Existing operating practices from various states’ 811 centers