Summit WM User Guide, Software Version 5.3 317
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)
Term Explanation
To Next Page
Loading...
