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Glossary of Terms RLXIB-ICN ♦ 802.11n
User Manual Industrial Client
Page 118 of 129 ProSoft Technology, Inc.
July 25, 2013
Gateway
In wireless terms, a gateway is an access point with additional software
capabilities such as providing NAT and DHCP.
H
Half-Duplex
A communications circuit or system designed to transmit and receive data, but
not both simultaneously. Citizens' Band (CB) or walkie-talkie radios are an
example of a half-duplex communication system. Either party to a radio
conversation may talk or listen; but both cannot talk at the same time without
corrupting each other's signal. If one operator is "talking", the other must be
"listening" to have successful communication.
Hysteresis
A property of a system such that an output value is not a strict function of the
corresponding input, but also incorporates some lag, delay, or history
dependence, and in particular when the response for a decrease in the input
variable is different from the response for an increase.
Hz
Hertz. The international unit for measuring frequency equivalent to the older unit
of cycles per second. One megahertz (MHz) is one million hertz. One gigahertz
(GHz) is one billion hertz. The standard US electrical power frequency is 60 Hz.
802.11a devices operate in the 5 GHz band; 802.11b and g devices operate in
the 2.4 GHz band.
I
IEEE
Institute of Electrical and Electronics Engineers, Inc. IEEE is a professional
organization with members in over 175 countries and is an authority in technical
areas such as computer engineering and telecommunications. IEEE developed
the 802.11 specifications.
IP Address
A 32-bit identification number for each node on an Internet Protocol network.
These addresses are represented as four sets of 8-bit numbers (numbers from 0
to 255), separated by periods ("dots").
Networks using the TCP/IP Protocol route messages based on the IP address of
the destination. Each number can be 0 to 255. For example, 192.168.0.100 could
be an IP address. Each node on the network must have a unique IP address.
IPv6
Internet Protocol version 6 (IPv6) is an update to the Internet Protocol
specification, and is designated as the successor to IPv4, the implementation
most commonly used today. The benefits of IPv6 include support for a 128-bit
address, simplified address assignment, and improved network security.