The material contained in this appendix furnishes a guideline for reliability and maintainability of UNICOM and presents some desirable objectives in these areas. It contains definitions of reliability, maintainability, system down time, station down time, error, fault, etc., as they apply to UNICOM. It presents objectives for reliability, fault detection and diagnosis, and repair time. It points out the various factors to be considered in the design of the switching center equipment, including equipment design factors, program design factors, system design factors, and security aspects of maintenance.
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