Extreme Networks Summit WM Series Uživatelská příručka stáhnout pdf (Strana 231)

Summit WM Series WLAN Switch and Altitude Access Point Software Version 4.1 User Guide

231

FHSS Frequency-Hopping Spread Spectrum. A transmission technology

used in Local Area Wireless Network (LAWN) transmissions where

the data signal is modulated with a narrowband carrier signal that

“hops” in a random but predictable sequence from frequency to

frequency as a function of time over a wide band of frequencies. This

technique reduces interference. If synchronized properly, a single

logical channel is maintained. (Compare DSSS)

Fit, thin and fat APs A thin AP architecture uses two components: an access point that is

essentially a stripped-down radio and a centralized management

controller that handles the other WLAN system functions. Wired

network switches are also required.

A fit AP, a variation of the thin AP, handles the RF and encryption,

while the central management controller, aware of the wireless users'

identities and locations, handles secure roaming, quality of service,

and user authentication. The central management controller also

handles AP configuration and management.

A fat (or thick) AP architecture concentrates all the WLAN intelligence

in the access point. The AP handles the radio frequency (RF)

communication, as well as authenticating users, encrypting

communications, secure roaming, WLAN management, and in some

cases, network routing.

FQDN Fully Qualified Domain Name. A “friendly” designation of a

computer, of the general form

computer.[subnetwork.].organization.domain. The FQDN names must

be translated into an IP address in order for the resource to be found

on a network, usually performed by a Domain Name Server.

FTM Forwarding Table Manager

FTP File Transfer Protocol

Gateway In the wireless world, an access point with additional software

capabilities such as providing NAT and DHCP. Gateways may also

provide VPN support, roaming, firewalls, various levels of security,

etc.

Gigabit Ethernet The high data rate of the Ethernet standard, supporting data rates of 1

gigabit (1,000 megabits) per second.

GUI Graphical User Interface

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Extreme Networks Summit WM Series Uživatelská příručka Strana 231