RLX2-IHx Series ♦ 802.11a, b, g, n
Glossary of Terms
Industrial Hotspots
User Manual
ProSoft Technology, Inc.
Page 244 of 248
Megahertz
A measure of electromagnetic wave frequency equal to one million hertz. Often
abbreviated as MHz and used to specify the radio frequency used by wireless devices.
MIC
Message Integrity Check
. One of the elements added to the TKIP standard. A signature
is added by each radio on each packet it transmits. The signature is based on the data in
the packet, a 64-bit value (key) and the MAC address of the sender. The MIC allows the
receiving radio to verify (check) that the data is not forged or altered.
MIMO
Multiple Input Multiple Output
refers to using multiple antennas in a Wi-Fi device to
improve performance and throughput. MIMO technology takes advantage of a
characteristic called multipath, which occurs when a radio transmission starts out at
Point A and the reflects off or passes through surfaces or objects before arriving, via
multiple paths, at Point B. MIMO technology uses multiple antennas to collect and
organize signals arriving via these paths.
Modbus
The Modbus protocol provides the internal standard that the MODICON
®
controllers use
for parsing messages. During communications on a Modbus network, the protocol
determines how each controller knows its device address, recognizes a message
addressed to it, determines the kind of action to be taken, and extracts any data or other
information contained in the message. If a reply is required, the controller constructs the
reply message and sends it using Modbus protocol.
Modem
MOdulator-DEModulator
, a device that converts digital signals to analog signals and
vice-versa. Analog signals can be transmitted over communications links such as
telephone lines.
N
Network
A series of stations or nodes connected by some type of communication medium. A
network may consist of a single link or multiple links.
Node
An address or software location on the network.
Non-Occupancy Period
The time during which a radio cannot return to a frequency where radar was detected.
This time is typically 30 minutes. Typically a radio will not return to a channel where
radar was previously detected unless absolutely necessary.
Null Modem Cable
A specialty cross-communication cable with female connectors on each end used for
direct connection between DTE devices when no modems are present. Commonly used
as a quick and inexpensive way to transfer files between two PCs without installing a
dedicated network card in each PC.
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