Bandwidth
Wireless networks typically have lower bandwidth than wired networks. A wired network can have an available bandwidth of up to 700 Mbps, while wireless networks typically offer no more than 25 Mbps.
It is paramount to minimize the amount of data that is transmitted wirelessly. This can be achieved by ensuring the video surveillance system deployed utilizes the best compression available, is operating on a distributed architecture and ensures the minimum amount of video is transmitted.
Compression
Deploying efficient H.264 compression can significantly affect the performance of the wireless IP video system. This is important when using high definition cameras. With the limited bandwidths available from wireless networks, this is an important consideration.
Architecture
There are two architectures used by IP video systems: centralized and distributed. A centralized architecture uses a master database, usually located in the central control room. A distributed architecture spreads the data around the security management system, generally keeping it close to where it is produced or needed.
Normally, more data is transferred across the network to the centralized video and storage servers than would be the case with a distributed system. Well-designed distributed systems reduce the need for large amounts of data to travel large distances.
Multicasting
IP multicasting is a networking feature that allows video from the same camera to be viewed and recorded by multiple operators simultaneously, using the same bandwidth as a single operator would. Using multicasting on a distributed system is a efficient solution for IP video systems.
Summary
The benefits of using wireless networks with IP video systems are clear and can sometimes be the only solution available for large or remote areas. However, the overall performance of the network and surveillance system depends on the performance, features and capability of the IP video system itself. Choosing the correct IP video technology that has good compression, the most suitable architecture and fully-featured network cameras is important.