
RLX2-IHx Series ♦ 802.11a, b, g, n
Glossary of Terms
Industrial Hotspots
User Manual
ProSoft Technology, Inc.
Page 246 of 248
RS-232
Recommended Standard 232
; the standard for serial binary signals between DTE and
DCE devices.
S
Sector Antenna
An antenna type that radiates in only a specific direction. Multiple sector antennas are
commonly used in point-to-multipoint situations.
Signal Diversity
A process by which two antennas are used to send and receive, combining their results
for better effect.
Signal Loss
The amount of signal strength that’s lost in antenna cable, connectors, and free space.
Signal loss is measured in decibels (dB). Also referred to as gain loss.
Signal Strength
The strength of the radio waves received at a wireless device.
Site Survey
A comprehensive facility study performed by network managers to ensure that planned
service levels will be met when a new wireless LAN or additional WLAN segments to an
existing network are deployed. Site surveys are usually performed by a radio frequency
engineer and used by systems integrators to identify the optimum placement of access
points to ensure that planned levels of service are met. Site surveys are sometimes
conducted following the deployment to ensure that the WLAN is achieving the necessary
level of coverage. Site surveys can also be used to detect rogue access points.
Spectrum
A range of electromagnetic frequencies.
Spread Spectrum
A form of wireless communication in which a signal’s frequency is deliberately varied.
This increases bandwidth and lessens the chances of interruption or interception of the
transmitted signal.
SSID
Service Set Identifier
is a sequence of characters unique to a specific network or
network segment that’s used by the network and all attached devices to identify
themselves and allow devices to connect to the correct network when one or more than
one independent network is operating in nearby areas.
Subnet Mask
A mask used to determine what subnet an IP address belongs to. An IP address has two
components: the network address, and the host (node or device) address; for example
the IP address 150.215.017.009. Assuming this is part of a Class B network (with a
subnet mask of 255.255.0.0), the first two numbers (150.215) represent the Class B
network address, and the second two numbers (017.009) identify a particular host on
this network.
T