Lorex LW2220 Instruction Manual download pdf (Page 22)

Appendix C: Facts About Digital Wireless Cameras

9. Appendix C: Facts About Digital Wireless

Cameras

9.1 Wired vs. Wireless Cameras

A wired camera has a video cable that transmits the video signal from the camera to a

recording or viewing device.

A wireless camera does

not use a video cable. Instead, it wirelessly transmits the video

signal to a wireless receiver that is connected to your recording or viewing device. Although

the typical digital wireless camera is priced slightly higher than a wired camera, wireless

cameras can provide cost savings compared to standard wired setups. For example,

wireless cameras do not require cabling to be run between the camera and the viewing /

recording device, which reduces installation time and cost.

9.2 Does a wireless camera require power?

Yes. Wireless cameras require two power sources: one connected to the camera, and the

other to the receiver.

9.3 How far can a wireless camera transmit a video signal?

In an open field (with line of sight), a typical wireless camera has a range between 250 to

500 feet. In a closed environment—such as an interior of a house—the wireless camera

range is between 100 to 165 feet. The signal range varies depending on the type of building

materials and/or objects the wireless signal must pass through.

Cubical walls, drywall, glass, and windows generally do not degrade wireless

signal

strength. Brick, concrete floors, and walls degrade signal strength

. Trees that are in the

line of sight of the wireless camera and receiver may impact signal strength.

The signal range also depends on whether there are compet

ing signals using the same

frequency as the camera. For example, signals from cordless phones or routers may affect

signal strength.

Range Limiting Factors

Reflection

The signal

reflects back

Scattering

The signal scatters

back into multiple

new signals

Refraction

The signal bends

as it travels

through an

object (e.g. glass

window)

Diffraction

The signal

changes direction

as it passes

around an object

Attenuation

The signal

strength weakens

as it passes

through an object

Source: Xirrus (2010). "Wi-Fi Range Dynamics". 

Retrieved online at http://xirrus.gcsmarket.com/pdfs/Xirrus_Wi-Fi_Range.pdf

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