Справочник Пользователя для Redline Communications Inc. AN30
AN-30 System User Manual
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11.1.
Appendix 1 - Glossary Of Terms
AN-30
Redline Communications’ Access Node-50 Broadband Fixed
Wireless (BFW) system.
Wireless (BFW) system.
Antenna
A device for transmitting and/or receiving a radio frequency (RF).
Antennas vary in design and frequencies supported.
Antennas vary in design and frequencies supported.
Antenna Gain
The measure of antenna performance relative to a theoretical antenna
called an isotropic antenna.
called an isotropic antenna.
ARQ
Automatic Repeat Request. This is the protocol used over the air for
error correction.
error correction.
Beamwidth
The angle of signal coverage provided by an antenna.
BFW
Broadband Fixed Wireless
Bps (Bits Per Second)
A unit of measurement for the rate at which data is transmitted.
BPSK
Binary Phase Shift Keying.
Channel
A communications path wide enough to permit a single RF
transmission.
transmission.
dB
A ratio expressed in decibels.
dBi
A ratio, measured in decibels, of the effective gain of an antenna
compared to an isotropic antenna.
compared to an isotropic antenna.
dBm
Decibels above a milliwatt
DHCP
Dynamic Host Configuration Protocol. A DHCP server will
automatically issue IP addresses within a specified range to devices
on a network.
automatically issue IP addresses within a specified range to devices
on a network.
Directional Antenna
An antenna that concentrates transmission power into one direction.
Encryption
For the purposes of privacy, the transformation of data into an
unreadable format until reformatted with a decryption key.
unreadable format until reformatted with a decryption key.
Ethernet
A LAN architecture using a bus or star topology
FD
Full Duplex. Refers to the transmission of data in two directions
simultaneously (i.e. a telephone)
simultaneously (i.e. a telephone)
FWA
Fixed Wireless Access
Gain
The ratio of the output amplitude of a signal to the input amplitude of
a signal. Typically expressed in decibels (dB).
a signal. Typically expressed in decibels (dB).
Gateway
A network point that acts as an entrance to another network.
GHz
Gigahertz. 1,000,000,000 Hz, or 1,000 MHz
GUI
Graphical User Interface
Hertz (Hz)
The international unit for measuring frequency, equivalent to the
number of cycles per second. One megahertz (MHz) is one million
Hertz. One gigahertz (GHz) is one billion Hertz.
number of cycles per second. One megahertz (MHz) is one million
Hertz. One gigahertz (GHz) is one billion Hertz.
IF
Intermediate Frequency.
IP (Internet Protocol)
See TCP/IP.
Isotropic
A theoretic construct of an antenna that radiates its signal 360 degrees
both vertically and horizontally—a perfect sphere. Generally used as
a reference.
both vertically and horizontally—a perfect sphere. Generally used as
a reference.
IXC (Inter-exchange Carrier)
A long-distance phone company.
LAN (Local Area Network)
A data communications network, typically within a building or
campus linking computers, printers and other devices together.
campus linking computers, printers and other devices together.
LEC (Local Exchange Carriers) The traditional local wired phone company.
LED
LED
Light Emitting Diode
LOS
Line Of Sight. A clear direct path between two antennas, with no
obstructions within the first Fresnel zone.
obstructions within the first Fresnel zone.
MAC (Media Access Control)
A unique number assigned to a network device. It corresponds to the
Page 74 of 80
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