WHY Wireless Digital Video?

Why NOT Wireless Digital Video?

Choice of Frequencies ... 2.4 or 5.8 GHz?

In North America and much of the world, two microwave frequency bands are available for unlicensed radio applications below 10 GHz; 2.4 and 5 GHz. The 2.4 (actually 2.4 to 2.4835 GHz with 11 channels of 5 MHz bandwidth) is the most popular and tends to be very crowded in urban areas. Interference problems are frequent, so planning and Coherent Communications' highly directional antennas are critical. The newer band at 5 GHz is much less crowded for the time being, and is a larger band. It is split as follows for outdoor applications: 5.25 to 5.35, 5.47 to 5.725 and 5.725 to 5.850 GHz, or 20 channels of 20 MHz each. The number of channels is misleading, especially in the 2.4 GHz band where there are only 4, non-overlapping channels.

The lower frequency (2.4 GHz) has less signal loss due to atmospheric absorption and rain, fog and snow. It requires lower gain (less expensive) Coherent Communications' antennas and is not as sensitive to line of sight issues as the 5 GHz systems. The technology is more mature and costs are generally lower for the equipment. Assuming no interference, we can operate about 15 to 20 wireless cameras at 30 fps, full motion, full screen (4CIF) and high resolution at one location, and several times this number at reduced frame rate and/or resolution.

The 5.8 GHz frequency band is wide enough for us to operate about 100 wireless cameras in one location at top speed and resolution. Many more can be operated assuming a lower frame rate or lower resolution.

The 2.4 GHz Solution
Model WDV-24-BAP

Using wireless is a very cost-effective and practical solution compared to the expense of wiring or paying for leased lines. It also allows transmission where wiring would be impractical, such as across water, streets, railroad tracks, private property, etc. Distances of 5-10 miles or more are possible with high-gain antennas and suitable antenna elevation. Coherent's model WDV-24-BAP's low-voltage and low-current consumption make solar power practical for remote sites. The WDV-24-BAP transceiver is designed to provide a wireless link between one or more of our WDV-700-TX and 700-RX video/audio/data encoders and decoders. One of the BAPs can support three to five encoder/decoder pairs and still maintain full motion, real-time video. A reasonable total number of wireless cameras is 15 to 20 in one location. Additional pairs may be added if a lower frame rate or resolution is acceptable.

Features of the 2.4 GHz Solution

The 5.8 GHz Solution
Models WDV-B58 Base Unit and WDV-C58 Client Unit

These systems are tremendously convenient and provide a real cost saving benefit over traditional wired networks (no cable installation or maintenance expenses). Plug-and-play technology provides minimal configuration. Coherent 5.8 GHz wireless products allow an unprecedented number of wireless cameras that can be rapidly deployed around a large campus, a city, an industrial plant, airport, harbor, etc. to secure an area temporarily or permanently. The B58 and C58s can support up to 20 encoder/decoder pairs per system or over 100 full motion, 30 fps, real time, high resolution (4 CIF), wireless cameras per location! Additional pairs may be added if a lower frame rate is acceptable. These systems are low voltage, and low-current consumption makes solar power practical for remote sites. High data rates of up to 108 MBs in Turbo Mode, allow throughput equal or superior to wired Ethernet and will meet your foreseeable networking needs. A NEMA3-4 enclosure guarantees complete environmental protection. An optional heater and fan are available for extra hot or cold climates. One of our NM4-6Es will comfortably hold a WDV-B58 or C58 and either a WDV-700-TX or 700-RX video encoder/decoder.