User guide

HiPath Wireless Standalone 802.11n AP User Guide D-11
push-to-talk (PTT) The push-to-talk (PTT) is feature on wireless telephones that
allows them to operate like a walkie-talkie in a group, instead of
standard telephone operation. The PTT feature requires that the
network be configured to allow multicast traffic.
A PTT call is initiated by selecting a channel and pressing the ‘talk’
key on the wireless telephone. All wireless telephones on the
same network that are monitoring the channel will hear the
transmission. On a PTT call you hold the button to talk and release
it to listen.
QoS Quality of Service. A term for a number of techniques that
intelligently match the needs of specific applications to the
network resources available, using such technologies as Frame
Relay, Asynchronous Transfer Mode (ATM), Ethernet and 802.1
networks, SONET, and IP-routed networks. QoS features provide
better network service by supporting dedicated bandwidth,
improving loss characteristics, avoiding and managing network
congestion, shaping network traffic, setting traffic priorities across
the network.
Quality-of-Service (QoS): A set of service requirements to be met
by the network while transporting a flow. (RFC2386)
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)
Term Definition