Reference
RLX-FHE, RLX-FHES, RLX-FHS
♦
RadioLinx FH
Frequency-Hopping Industrial Radio
ProSoft Technology, Inc.
Page 133 of 151
November 25, 2008
Direct Sequence Spread Spectrum:
One of two approaches (with frequency
hopping spread spectrum) for sorting out overlapping data signals transmitted via
radio waves. 802.11b uses DSSS
Directional Antenna:
Transmits and receives radio waves off the front of the
antenna.
Diversity Antenna:
An antenna system that uses multiple antennas to reduce
interference and maximize reception and transmission quality.
DTE:
Data Terminal Equipment, for example, a computer or terminal.
Dual Band:
A device that is capable of operating in two frequencies. On a
wireless network, dual-band devices are capable of operating in both the 2.4
GHz (802.11b/g) and 5 Hz (802.11a) bands.
EAP:
Extensible Authentication Protocol. A protocol that provides an
authentication framework for both wireless and wired Ethernet enterprise
networks.
EIRP:
Equivalent isotropically radiated power (EIRP) is the amount of power that
would have to be emitted by an isotropic antenna (that evenly distributes power
in all directions and is a theoretical construct) to produce the peak power density
observed in the direction of maximum antenna gain.
Encryption:
Method of scrambling data so that only the intended viewers can
decipher and understand it.
ESSID:
Extended Service Set Identifier. A name used to identify a wireless
network.
firmware:
Firmware is the embedded software code that is in the radio to direct
radio 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 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.
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.
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:
Simultaneous two-way independent transmission in both directions
Gain:
The amount by which an antenna concentrates signal strength in a
wireless network.
Gateway:
In wireless terms, a gateway is an access point with additional
software capabilities such as providing NAT and DHCP.
