Extreme Networks Summit WM Series Podręcznik Użytkownika Strona 158

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Glossary
Summit WM-Series WLAN Switch and Altitude Access Point Software Version 1.0 User Guide
158
R
RADIUS Remote Authentication Dial-In User Service. An authentication and
accounting system that checks User Name and Password and
authorizes access to a network. The RADIUS specification is
maintained by a working group of the IETF (RFC2865 RADIUS,
RFC2866 RADIUS Accounting, RFC2868 RADIUS Attributes for
Tunnel Protocol Support).
RF Radio Frequency, a frequency in the electromagnetic spectrum
associated with radio wave propagation. When an RF current is
supplied to an antenna, an electromagnetic field is created that can
propagate through space. These frequencies in the electromagnetic
spectrum range from Ultra-low frequency (ULF) -- 0-3 Hz to
Extremely high frequency (EHF) -- 30GHz - 300 GHz. The middle
ranges are: Low frequency (LF) -- 30 kHz - 300 kHz, Medium
frequency (MF) -- 300 kHz - 3 MHz, High frequency (HF) -- 3MHz - 30
MHz, Very high frequency (VHF) -- 30 MHz - 300 MHz, Ultra-high
frequency (UHF)-- 300MHz - 3 GHz.
RFC Request for Comments, a series of notes about the Internet, submitted
to the Internet Engineering Task Force (IETF) and designated by an
RFC number, that may evolve into an Internet standard. The RFCs are
catalogued and maintained on the IETF RFC website: www.ietf.org/
rfc.html.
Roaming In 802.11, roaming occurs when a wireless device (a station) moves
from one Access Point to another (or BSS to another) in the same
Extended Service Set (ESS) -identified by its SSID.
RP-SMA Reverse Polarity-Subminiature version A, a type of connector used
with wireless antennas
RSN Robust Security Network. A new standard within IEEE 802.11 to
provide security and privacy mechanisms. The RSN (and related TSN)
both specify IEEE 802.1x authentication with Extensible Authentication
Protocol (EAP).
RSSI RSSI received signal strength indication (in 802.11 standard)
RTS / CTS RTS request to send, CTS clear to send (in 802.11 standard)
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