User Manual Part 2

Lynx.GX Installation and Management
Acronyms / Glossary 106
RF
Radio Frequency
RIP
Routing Information Protocol. A widely-used protocol for
managing router information within a self-contained network
such as a corporate local area network or an interconnected
group of such LANs.
RMA
Return Material Authorization
RS-232C
A long-established standard ("C" is the current version) that
describes the physical interface and protocol for relatively low-
speed serial data communication between computers and
related devices.
RSL
Received Signal Level
RU
Rack Unit
SELV
Safety Extra Low Voltage.
serial
One event at a time. Within electronics, digital signals carried
across two-wire interfaces for transmit and receive.
SMA connector
SMA is an acronym for SubMiniature version A and was
developed in the 1960's. It uses a threaded interface. 50 Ω SMA
connectors are semi-precision, subminiature units that provide
excellent electrical performance from DC to 18 GHz.
SMTP
A TCP/IP protocol used in sending and receiving e-mail.
SNMP
Simple Network Management Protocol. The protocol governing
network management and the monitoring of network devices and
their functions.
Spectrum Analyzer
An RF Spectrum Analyzer is a very special kind of
superhetrodyne receiver that receives a chosen range of signals
and displays the relative signal strength on a logarithmic display,
usually a cathode ray oscilloscope.
T1
Also T-1. The T-carrier system, introduced by the Bell System in
the U.S. in the 1960s, was the first successful system that
supported digitized voice transmission. The original transmission
rate (1.544 Mbps) in the T-1 line is in common use today in
Internet service provider (ISP) connections to the Internet. The
T-carrier system is entirely digital, using pulse code modulation
and time division multiplexing. The system uses four wires and
provides duplex capability (two wires for receiving and two for
sending at the same time).
Telnet
A user command and an underlying TCP/IP protocol for
accessing remote computers.
Tmra
Temperature, maximum room ambient.
TNC connector
TNC stands for Threaded Neill Concelman and is named after
Amphenol engineer Carl Concelman. Designed as a threaded
version of the BNC, the TNC series features screw threads for
mating. TNC are miniature, threaded weatherproof units with a
constant 75 Ω impedance and they operate from 0 - 11 GHz.
UL-listed
Listed by Underwriter’s Laboratories, an independent, not-for-
profit product safety testing and certification organization.
U-NII
Unlicensed National Information Infrastructure. The U-NII
spectrum is located at 5.15-5.35 GHz and 5.725-5.825 GHz. U-
NII devices do not require licensing.
VDC
Volts of direct current.
VF
Voice Frequency.
voltage
Voltage, also called electromotive force, is a quantitative
expression of the potential difference in charge between two
points in an electrical field.
VOM
Volt Ohm Meter.
VSWR
Return loss measurement
WAN
Wide Area Network.
waveform
A representation of how alternating current (AC) varies with time.
waveguide
A hollow, tube shaped device constructed of metal with a vinyl or
polypropylene coating, used for conducting RF energy from an
emission source, such as a microwave transmitter, to an
antenna
.