Allied Telesis AT-WL2411 - Manual (Page 4)

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PN 613-50537-00 Rev A
4
Introduction
The purpose of this document is to provide Allied Telesyn, Inc. personnel a tool which will enable them to
better understand how the various Allied Telesyn antennas, cable assemblies, and accessories blend
together.
Regulatory Concerns
Note: The information below will help you to understand some of the regulatory issues surrounding the
use of antenna, antenna circuits, and radios. However, it is critical to remember that all antennas must be
approved and certified before they can be used with radio (RF) equipment purchased from Allied Telesyn.
FCC
FCC requirements limit the total output power of a wireless LAN system operating in 2.4 GHz frequency
ranges to 4 Watts. This limit is expressed in EIRP, which stand for “Effective Isotropically Radiated
Power.” This is the total power created by the transmitter and gain generated by the antenna, minus any
loss due to cabling and connections. Given this 4W (4000 mW) maximum, the EIRP must not exceed
36dBi.
ETSI
ETSI requirements limit the total output power of a 2.4 GHz wireless LAN system to 0.1 Watt (100 mW).
Given this 100 mW maximum, the EIRP must not exceed 20dBm. Most European countries such as France
and Italy operate under a lower power directive, which limits them to a maximum output limit of 10 mW.
Non-ETSI & Non-FCC Countries
Electromagnetic-transmission regulations are mandated by each country’s own governing body. Many
countries follow the directives issued by ETSI or the FCC but others create their own regulations.
Before adding radios or antennas to a RF system, please consult a certified Allied
Telesyn Systems Consultant operating in the country where the system will be used.