User's Manual

Glossary
79
MAC: Media Access Controller. The next layer up from the PHY.
Mbit/s: Megabits per second
MHz: Megahertz (one million cycles per second)
MIB: Management Infomation Base
N
NLOS: Non Line-of-Sight radio propagation path
O
ODU: Outdoor Unit (i.e. ProST)
OFDM: Orthogonal Frequency Division Multiplexing
Q
QAM: Quadrature Amplitude Modulation
QoS: Quality of Service, which is used to specify level of data throughput
QPSK: Quadrature Phase Shift Keying
R
RF: Radio Frequency
Rx: Receive
S
SDA-4S: Convenient term for either the SDA-4S Type II or SDA-4S/VL adapters
SF: Service Flow
SME: Small and Medium-sized Enterprise
SNMP: Simple Network Management Protocol
SNR: Signal-to-Noise Ratio
ST: Subscriber Terminal (interchangeable with CPE or SS)
T
TDMA: Time Division Multiple Access. Technology for delivering digital wireless service using time-
division multiplexing (TDM)
TNV: Telecommunications Network Voltage
Tx: Transmit
U
UGS: Unsolicited Grant Service. Used to provide fixed bandwidth slots on the uplink for an ST to
transmit data at regular intervals. The bandwidth should be used by the UGS SF, however
the final decision of which SF (if any) uses the bandwidth slot is made by the ST.