记录设备-闭路电视监控设备及记录设备须每季度维修测试一次，记录备查。
Maintenance - all CCTV and Recording Mediums shall be maintained and serviced at least once each 90-days. A record of such maintenance shall be available for the auditors review.
本文根据高层楼宇对保安系统的具体要求，介绍高层楼宇中闭路电视系统的组成、设计、监控范围和设备选择等内容。
According to the concrete security requirements of large buildings, this paper describes the composing, designing, range of monitoring and selecting of the equipments of CCTV system.
本文介绍了闭路电视在高速公路监控上的应用，重点介绍了隧道部分闭路监控系统的结构、设备选型、传输方式等。
The paper introduces the application of CCTV in freeway, especially introduces the structure, selection of equipment, transmission mode of the CCTV system in tunnels.
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