RLX2 Industrial Hotspot Series
Page 198 of 212 ProSoft Technology, Inc.
June 15, 2015
Encryption
Method of scrambling data so that only the intended viewers can decipher and
understand it.
ESD
Electrostatic Discharge. Can cause internal circuit damage to the coprocessor.
ESSID
Extended Service Set Identifier. A name used to identify a wireless network.
F
Firmware
Firmware is the embedded software code that that runs in the module to direct module
function (similar to the BIOS in a personal computer). This is distinguished from the
Setup/Diagnostic Application software that is installed on the Configuration PC.
Frequency Hopping
A radio that rapidly changes its operating frequency several times per second following
a pre-determined sequence of frequencies. The transmitting and receiving radios are
programmed to follow the same frequency hopping sequence.
Frequency Hopping Spread Spectrum
Changes or hops frequencies in pattern known to both sender and receiver. FHSS is little
influenced by radio stations, reflections, or other environmental factors. However, it is
much slower than DSSS.
Fresnel Zone
An elliptical area on either side of the straight line of sight that must also be clear for a
long-range wireless network to work.
Full-Duplex
A communications circuit or system designed to simultaneously transmit and receive
two different streams of data. Telephones are an example of a full-duplex
communication system. Both parties on a telephone conversation can talk and listen at
the same time. If both talk at the same time, their two signals are not corrupted.
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