Wireless Security Cameras
Any network camera can become wireless by connecting it to a wireless bridge. Some cameras have wireless interfaces built-in — though they are are uncommon and are limited in power and functionality. Wireless cameras are great options to deploy on poles or detached structures where the view is optimal.
Wireless cameras, aside from their name, require some source of power. Many light poles and detached structures already have a power source. In instances where no power is available the only alternatives are solar or temporary battery power. Temporary battery power only provides power for a short time, usually less than 48 hours. Solar power is the best option where other power does not exist, however is generally cost prohibitive unless under special circumstances.
The transmission distance varies upon the type of wireless bridge, the wireless frequency, required resolution, desired frame rate, and the wireless antenna height from the ground. Distances can range from as low as 50 feet all the way up to several miles.
Wireless Analog CCTV
Before IP cameras became affordable, some CCTV cameras had either built-in wireless antennas or separate wireless devices for analog signal transmission. The images produced from these wireless devices were often grainy or distorted. With network ip cameras, wireless transmission can be as clear as a wired camera. Using the network TCP/IP stack, digitized packets that contain errors caused by signal loss, diffraction or interferance can be resent within milliseconds before the next frame is even sent. Older wireless CCTV cameras can easily be replaced with newer and better quality ip cameras with wireless bridges.
Point-to-point wireless involves one access point and one bridge or two bridges to carry the wireless signal from point A to point B. Point-to-point wireless infrastructure can be used in a line, down a road for instance, transmitting the signal from point A to point B then point B to point C then point C to point D.
Point-to-multipoint involves one access point and several bridges. The access point accepts packets from multiple bridges at the same time. An access point in the center of at the endpoint is used at the front of the network. Bridge devices within line of sight transmit their video data directly to the access point.
Wireless Mesh Infrastructure
Wireless mesh configurations involve many wireless bridges which could each transmit data to each other. Wireless mesh configurations used with security cameras are primarily for redundancy. Mesh network devices are often mistakenly used or specified in place of a point-to-point infrastructure.