DVRs were eventually equipped with an Ethernet port for network connectivity.
This introduced network DVRs to the market and enabled remote video monitoring using PCs. Some network DVR systems in use today enable the monitoring of both live and recorded video, whereas some allow the monitoring of only recorded video. Furthermore, some systems require a special Windows client to monitor the video, whereas others use a standard Web browser; the latter makes remote monitoring more flexible.
The network DVR system provides the following advantages:
· Remote monitoring of video via a PC
· Remote operation of the system
Although DVRs provided great improvements over VCRs, they also had some inherent downsides. The DVR was burdened with many tasks such as the digitization of video from all cameras, video compression, recording, and networking. Additionally, it was a “black box” solution, that is, proprietary hardware with preloaded software, which often forced the end user to source spare parts from one manufacturer, making maintenance and upgrading expensive. Virus protection was also difficult to implement. Although the DVR was often a
Windows-based machine, the proprietary interface did not allow for virus protection. In addition, the DVR offered limited scalability. Most DVRs offered 16 or 32 inputs, which made it difficult to cost-effectively build systems that were not multiples of 16, for example, systems with 10 or 35 cameras.
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