HOTSPOT GATEWAY
330 Glossary of Terms
more bits in the pattern are damaged during transmission, the original data can be recovered due to the
redundancy of the transmission.
DTIM
(Delivery Traffic Indication Message) A message included in data packets that can increase wireless
efficiency.
Dynamic IP Address
A temporary IP address that is assigned by the DHCP server to a device. Devices retain dynamic IP
addresses only for the duration of their networking session. When a device disconnects from the network,
the IP address is recaptured by the DHCP server and becomes available for reassignment to another device.
See also, DHCP, IP Address, IP Address Translation, Static IP Address, and Translation.
EAP
(Extensible Authentication Protocol) An extension to PPP. EAP is a general protocol for authentication
that also supports multiple authentication methods (for example, public key authentication and smart
cards). IEEE 802.1x specifies how EAP should be encapsulated in LAN frames. In wireless
communications using EAP, a user requests connection to a WLAN through an AP, which then requests the
identity of the user and transmits that identity to an authentication server such as RADIUS. The server asks
the AP for proof of identity, which the AP gets from the user and then sends back to the server to complete
the authentication.
ECommerce
A business venture between a supplier and its customers using online services (for example, the Internet).
Both parties use online services to conduct business transactions. Transactions may include generating
orders, invoices, and payments, and submitting inquiries. Also known as Enterprise.
ESS
(Extended Service Set) See Infrastructure mode.
Ethernet
A Local Area Network (LAN) protocol developed by Xerox Corporation in cooperation with DEC and Intel
in 1976. Ethernet uses a bus or star topology and supports data transfer rates of 10 Mbps. The Ethernet
specification served as the basis for the IEEE 802.3 standard, which specifies the physical and lower
software layers. Ethernet is one of the most widely implemented LAN standards. A newer version of
Ethernet, called 100Base-T (or Fast Ethernet), supports data transfer rates of 100 Mbps. The latest version,
Gigabit Ethernet, supports data rates of 1 Gigabit (1,000 Mbps) per second. See also, Mbps.
Fast Ethernet
See Ethernet.
FCC
(Federal Communications Commission) US wireless regulatory authority. The FCC was established by the
Communications Act of 1934 and is charged with regulating Interstate and International communications
by radio, television, wire, satellite and cable.
FDM
(Frequency Division Multiplexing) A multiplexing technique that uses different frequencies to combine
multiple streams of data for transmission over a communications medium. FDM assigns a discrete
Carrier
frequency to each data stream and then combines many modulated carrier frequencies for transmission.
For example, television transmitters use FDM to broadcast several channels at once.
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