Many security systems consist of digital video recorders (DVR).
许多安全系统都包含有数码录像机(DVR)。
With CCTV deployments, typical security camera density ranges from 4 to 32 channels per DVR, and come in increments of 4 or 8 channels.
使用CCTV部署时，每个DVR的典型安防摄像机密度范围从4个到32个通道，并且要留出4或8个通道作为扩展。
With CCTV deployments, typical security camera density ranges from 4 to 32 channels per DVR, and come in increments of 4 or 8 channels.
使用CCTV部署时，每个DVR的典型安防摄像机密度范围从4个到32个通道，并且要留出4或8个通道作为扩展。
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