Redline Communications AN-50e, Руководство пользователя

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AN-50e
user manual
70-00033-01-03 Proprietary Redline Communications © 2005 September 2005
Page 95 of 100
Term Definition
LED Light Emitting Diode
LOS Line Of Sight. A clear direct path between two antennas, with no
obstructions within the first Fresnel zone.
MAC Media Access Control. A unique number assigned to a network device.
Corresponds to ISO Network Model Layer 2 data link layer.
MHz Megahertz. 1,000,000 Hz
Modem MOdulator/DEModulator. A hardware device that 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 objects.
NVRAM Non-volatile RAM. System parameters are stored in NVRAM. This data is
not affected by powering off the system.
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.
PMP Point to Multipoint
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