Abstract
The Traffic Service Position System (tsps) No. 1 operational software for Automated Coin Toll Service provides the logic which controls the handling of coin-originated calls served by the system. The partitioning of responsibilities between the Station Signaling and the Announcement Subsystem (ssas) are illustrated. The maintenance philosophy, fault detection, diagnostics, and fault recovery aspects of the ssas are described. The maintenance strategy is centered on a multilevel fault detection scheme in which faults are analyzed and classified according to their degree of seriousness in affecting the ssas operation.
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