Rockwell Automation 1783-WAPxxx Stratix 5100 Wireless Access Point User Manual - Manual (Page 596)

596 Rockwell Automation Publication 1783-UM006A-EN-P - May 2014
Glossary
CCKM Cisco Centralized Key Management. By using CCKM, authenticated client
devices can roam from one access point to another without any perceptible delay
during reassociation. An access point on your network provides wireless domain
services (WDS) and creates a cache of security credentials for CCKM-enabled
client devices on the subnet. The WDS access point’s cache of credentials
dramatically reduces the time required for reassociation when a CCKM-enabled
client device roams to a new access point.
cell The area of radio range or coverage that the wireless devices can communicate
with the base station. The size of the cell depends upon the speed of the
transmission, the type of antenna used, and the physical environment, as well as
other factors.
client A radio device that uses the services of an wireless access point/workgroup bridge
to communicate with other devices on a local area network.
CSMA Carrier sense multiple access. A wireless LAN media access method specified by
the IEEE 802.11 specification.
data rates The range of data transmission rates supported by a device. Data rates are
measured in megabits per second (Mbps).
dBi A ratio of decibels to an isotropic antenna that is commonly used to measure
antenna gain. The greater the dBi value, the higher the gain, and the more acute
the angle of coverage.
DHCP Dynamic host configuration protocol. A protocol available with many operating
systems that automatically issues IP addresses within a specified range to devices
on the network. The device retains the assigned address for a specific
administrator-defined period.
dipole A type of low-gain (2.2-dBi) antenna consisting of two (often internal) elements.
domain name The text name that refers to a grouping of networks or network resources based
on organization-type or geography; for example: name.com—commercial;
name.edu—educational; name.gov—government; ISPname.net—network
provider, for example, an ISP; name.ar—Argentina; name.au—Australia; and so
on.
DNS Domain Name System server. A server that translates text names into IP
addresses. The server maintains a database of host alphanumeric names and their
corresponding IP addresses.
DSSS Direct sequence spread spectrum. A type of spread spectrum radio transmission
that spreads its signal continuously over a wide frequency band.
EAP Extensible Authentication Protocol. An optional IEEE 802.1x security feature
ideal for organizations with a large user base and access to an EAP-enabled
Remote Authentication Dial-In User Service (RADIUS) server.
Ethernet The most widely used wired local area network. Ethernet uses carrier sense
multiple access (CSMA) to allow computers to share a network and operates at
10, 100, or 1000 Mbps, depending on the physical layer used.