Nomadix AG 2100 User Manual page 340

AG 2100
DSSS
(Direct Sequence Spread Spectrum) One of two types of spread spectrum radio—the other being Frequency Hopping
WLAN
Spread Spectrum (FHSS). DSSS is a transmission technology used in transmissions where a data signal at the
sending station is combined with a higher data rate bit sequence, or "chipping" code, that divides the user data
according to a spreading ratio. The chipping code is a redundant bit pattern for each bit that is transmitted, which
increases the signal's resistance to interference. If one or 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
WLAN through an AP, which then requests the identity of the user and transmits that identity to an
connection to a
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.
Enterprise
WPA-Enterprise or WPA 2-Enterprise; requires IEEE 802.1x to obtain keys from RADIUS server; similar to dynamic
WEP
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.
326 Glossary of Terms