WLANA The Learning Zone for Wireless Networking

WLANA The Learning Zone for Wireless Networking: "What if the network has 100 nodes? Only one transmitter is active at any point in time, so the radiated power of a total network even when it has 100 nodes is actually equivalent to the radiated power of a single transmitter. WLAN transmitters operate at a power of 0.035 Watts (35 mW) in the 2.4 GHz band depending on the specific product in use and the local regulations. How does WLAN technology differ from cellular technology? WLAN products use a 'bursty' type of transmit/receive protocol, while Cellular transmits and receives constantly (connection oriented). As an example: If a user would transfer data on an average of 100 MB per day, the WLAN transmitter would be on the air for approximately 10 minutes. Moreover, a typical hand held-cell phone has a RF power output of 0.600 Watts (600 mW) or almost 20X more output power!"

http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2007/04/28/nesmog28.xml

http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2007/04/28/nesmog28.xml: "Under international guidelines the amount of energy absorbed into the body from such radio waves cannot exceed two watts per kilogram when averaged over any 10 grams of tissue. The maximum signal strength next to the router or computer transmitter is 0.1 watts and the power level falls off very rapidly beyond a few cms from the transmission points. However it is believed that a classroom containing 20 laptops and two routers could combine and be equivalent to the emission from a mobile phone."

Wireless Health risks? - NetStumbler.org Forums

Wireless Health risks? - NetStumbler.org Forums: "Additionally, the FCC states that the greatest health risks associated with RF occur in the frequencies between 30MHz and 300MHZ. Wifi is at 2.4GHz and 5GHz. You can search through the FCC website at www.FCC.gov for more information of RF health risks. *As a comparison, the average WiFi card puts out between thirty-two to one hundred thousandths of a watt (0.0032 to 0.1 watts.) The average cell phone puts out about 1 to 3 watts; several orders of magnitude higher."

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