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)。

youdao

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D VR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。

youdao

Early last week a security researcher who goes by the name someLuser published a blog post detailing his dissection of a DVR built by the security firm Swann, disassembling the device and running tests on it via its serial port.

FORBES: More Than A Dozen Brands Of Security Camera Systems Vulnerable To Hacker Hijacking