AN-30 System User Manual
ISO Network Model Layer 2 data link layer.
MHz
Megahertz. 1,000,000 Hz
Modem
(MOdulator/DEModulator)
A hardware device which converts digital data into analog and vice
versa.
Modulation
Any of several techniques for combining user information with a
transmitter carrier signal.
Multipath
The radio echoes created as a radio signal bounces off of objects.
NLOS
Non Line Of Sight. Completely obstructed path between two
antennas.
OFDM
Orthogonal Frequency Division Multiplexing. OFDM spreads data to
be transmitted over a large number of orthogonal carriers.
OLOS
Optical Line Of Sight. A clear direct path between two antennas, with
obstructions within the first Fresnel zone.
Packet
A bundle of data organized in a specific way for transmission. The
three principal elements of a packet include the header, the text, and
the trailer (error detection and correction bits).
PHY (Physical Layer)
Provides for the transmission of data through a communications
channel by defining the electrical, mechanical, and procedural
specifications.
PTP
Point to Point
QAM
Quadrature Amplitude Modulation
QPSK
Quadrature Phase Shift Keying
Receiver Sensitivity
A measurement of the weakest signal a receiver can receive and still
correctly translate it into data.
RF
Radio Frequency
Rx
Receiver
S/N
Signal to Noise Ratio
SINADR
Signal to noise and distortion ratio.
TCP/IP (Transmission Control
Protocol/Internet Protocol)
The standard set of protocols used by the Internet for transferring
information between computers, handsets, and other devices.
TFTP
Trivial File Transfer Protocol
Tx
Transmitter
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