Selecting Your NVRs
How many NVRs (Network Video Recorders) will you use and where are they located?
If all cameras "home run" back to a single NVR then that is going to need a different network configuration than if you use distributed smaller NVRs with backhaul feeds to a master Central Management System (CMS)
What protocols will the NVRs use to communicate with the cameras?
Unacknowledged protocols such as Unicast, Multicast, RTP/RTSP over UDP perform much better over wireless and wide area network links than do acknowledged protocols like HTTP (using client GET or server PUSH), TFTP, or other proprietary streaming mechinisms
Storage capacity and compression?
Are you going to compress your video on the camera (use H.264) or are you going to bring back less compressed video and transcode the video on your NVR? Not using compression on the cameras can significantly increase your wireless bandwidth requirements.
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We put the HauteSpot microNVR and Global Emergency Resources eWRAP to the test. Driving 700 miles from Meridian, Mississippi to Augusta, Georgia, we put a Mobotix megapixel camera attached to a microNVR and eWRAP in a moving van. The microNVR recorded at full frame rate and resolution all of the video from the camera. It also transcoded and pushed video out over the eWRAP using 3G EvDO wireless. The push architecture remained connected throughout the entire trip including through some relatively remote areas. See as short captured video of this test. 70 miles an hour, 700 miles, 10fps, VGA…