Cabletron Systems RoamAbout Access Point Manual page 160

Glossary
Channel (Frequency)
The center radio frequency that the wireless device uses to transmit.
The RoamAbout PC Card can support up to 13 radio frequency channels as defined in the
IEEE 802.11 Standard. The number of available channels for your PC Card is subject to radio
regulations that apply in your country. In most countries, these radio regulations adhere to
either the FCC or ETSI Standards.
Directional Antenna
An antenna that radiates RF signals in a specific direction. A directional antenna typically has
a higher gain and can cover a greater distance than an omni-directional antenna. A 14 dBi
Yagi directional antenna is available as an option for the RoamAbout Access Point.
ETSI
European Telecommunications Standards Institute. Standards body that governs use of
radio frequencies, mostly for European countries.
FCC
Federal Communications Commission. Standards body that governs use of radio frequencies,
mostly for North America.
IEEE 802.11 Standard
The Institute of Electrical & Electronics Engineers, Inc. (IEEE) is an organization that
develops standards for electrical and electronic equipment. IEEE 802.xx Standards define the
access technologies for local and metropolitan area networks. The IEEE 802.11 Standard is
an interoperability standard for wireless LAN devices that identifies three major distribution
systems for wireless data communication:
•
Direct Sequence Spread Spectrum (DSSS) Radio Technology
•
Frequency Hopping Spread Spectrum (FHSS) Radio Technology
•
Infrared Technology
IEEE 802.11 compliant networking products based on the same type of distribution system
are interoperable with one another regardless of the device's manufacturer. RoamAbout
802.11 DS products are compliant with the IEEE 802.11 Standard for wireless LAN devices
that use the Direct Sequence Spread Spectrum (DSSS) Radio Technology.
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