User Manual User guide

Rockwell Automation Publication 1783-UM006A-EN-P - May 2014 597
Glossary
ETSI The European Telecommunication Standardization Institute (ETSI) has
developed standards that have been adopted by many European countries as well
as many others. Under the ETSI regulations, the power output and EIRP
regulations are much different than in the United States.
file server A repository for files so that a local area network can share files, mail, and
programs.
firmware Software that is programmed on a memory chip.
gateway A device that connects two otherwise incompatible networks together.
GHz Gigahertz. One billion cycles per second. A unit of measure for frequency.
IEEE Institute of Electrical and Electronic Engineers. A professional society serving
electrical engineers through its publications, conferences, and standards
development activities. The body responsible for the Ethernet 802.3 and wireless
LAN 802.11 specifications.
infrastructure The wired Ethernet network.
IP address The Internet Protocol (IP) address of a station.
IP subnet mask The number used to identify the IP subnetwork, indicating whether the IP
address can be recognized on the LAN or if it must be reached through a gateway.
This number is expressed in a form similar to an IP address; for example:
255.255.255.0.
isotropic An antenna that radiates its signal in a spherical pattern.
MAC Media Access Control address. A unique 48-bit number used in Ethernet data
packets to identify an Ethernet device, such as an access point or your client
adapter.
modulation Any of several techniques for combining user information with a transmitter’s
carrier signal.
multipath The echoes created as a radio signal bounces off of physical objects.
multicast packet A single data message (packet) sent to multiple addresses.
omni-directional This typically refers to a primarily circular antenna radiation pattern.
Orthogonal Frequency Division Multiplex
(OFDM)
A modulation technique used by IEEE 802.11a-compliant wireless LANs for
transmission at 6, 9, 12, 18, 24, 36, 48, and 54 Mbps.
packet A basic message unit for communication across a network. A packet usually
includes routing information, data, and sometimes error detection information.
PoE Power over Ethernet, describes standardized or ad-hoc systems that pass electrical
power on Ethernet cabling. A single cable to pass data and electrical power to
devices such as wireless access points. An advantage to using PoE is that you can
pass data and power through long cable lengths.
Quadruple Phase Shift Keying A modulation technique used by IEEE 802.11b-compliant wireless LANs for
transmission at 2 Mbps.
range A linear measure of the distance that a transmitter can send a signal.