| 摘要 |
A security system comprises a host system, a plurality of master controllers and a plurality of sub-controllers, wherein each sub-controller is assigned a specific master controller as well as alternate master controllers for communication access upon failure of the primary master controller. The host, master controller and sub-controllers are all coupled by a series of primary communication networks and paths and have multiple alternative communication network paths which function should there be a failure of the primary communication network. The host system comprises system and application software, data storage devices and communication ports to support the application requirements of the master controller, sub-controller network and access control devices attached thereto necessary to support a fault tolerant network. The system is configured with backup communication networks between the components so that upon failure of one or more components or communication paths the function of the failed component or path is assumed by alternative predesignated components or paths such that the operations of the system is not interrupted.
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