发展
Development
第一代
First generation
传统模拟闭路视监控系统（CCTV）：
Traditional analog closed-circuit video surveillance system (CCTV):
依赖摄像机、线缆、录像机和监视器等专用设备。例如，摄像机通过专用同轴缆输出视频信号。缆连接到专用模拟视频设备，如视频画面分割器、矩阵、切换器、卡带式录像机（VCR）及视频监视器等。
It relies on special equipment such as cameras, cables, video recorders and monitors. For example, the camera outputs video signals through dedicated coaxial cables. The cable is connected to special analog video equipment, such as video picture splitter, matrix, switcher, VCR and video monitor.
模拟CCTV存在大量局限性：
Simulated CCTV has many limitations:
有限监控能力只支持本地监控，受到模拟视频缆传输长度和缆放大器限制。
Limited monitoring capability only supports local monitoring, limited by analog video cable transmission length and cable amplifier.
有限可扩展性系统通常受到视频画面分割器、矩阵和切换器输入容量限制。
Limited scalability systems are usually limited by the input capacity of video picture splitters, matrices and switches.
录像负载重用户必须从录像机中取出或更换新录像带保存，且录像带易于丢失、被盗或无意中被擦除。
Video overload heavy users must remove or replace new videotapes from the video recorder to save, and the videotapes are easy to be lost, stolen or inadvertently erased.
录像质量不高是主要限制因素。录像质量随拷贝数量增加而降低。
The low quality of video is the main limiting factor. Video quality decreases as the number of copies increases