Reliability of a Microprocessor-Based Protection Switching System
G. S. Fang · Bell System Technical Journal · 1978
High-capacity transmission systems usually include one or more hot spares for protection. When a regular transmission channel fails, its signal is rapidly transferred to the spare channel under the control of protection switching circuits so that there is little signal degradation or interruption. This paper studies the reliability of a microprocessor-based terminal protection switching system. Some new and interesting behavior patterns for transmission systems with automatic protection switching are revealed. Also, some new memory self-checking algorithms are presented which increase the capability of microprocessor system fault recognition.