D-Link DWS-1008 User Manual page 422

DWS-1008 User's Manual
DSSS
Direct-sequence spread-spectrum. One of two types of spread-spectrum radio technology
used in wireless LAN (WLAN) transmissions. To increase a data signal's resistance to
interference, the signal at the sending station is combined with a higher-rate bit sequence
that spreads the user data in frequency by a factor equal to the spreading ratio. Compare
FHSS.
DTIM
Delivery traffic indication map. A special type of traffic indication map (TIM) element in a
beacon frame that occurs only when a station in a basic service set (BSS) is in power-save
mode. A DTIM indicates that any buffered broadcast or multicast frames are immediately
transmitted by an access point (AP).
DXF format
A tagged data representation, in ASCII format, of the information contained in an AutoCAD
drawing file.
dual-homed connection
A redundant, resilient connection between a DWL-8220AP access point and a DWS-1008
switch. The connection can consist of two direct physical links from both AP ports to one
or two switches, one or more distributed links through an intermediate Layer 2 or Layer 3
network, or a combination of one direct physical link and one or more distributed links. The
AP uses one link for booting, configuration, and data transfer and uses the other link(s) as
backups in case the active link fails. If the AP has two direct physical links to one or more
switches, the Power over Ethernet (PoE) load is shared across both links. If the active data
link fails, the other link provides uninterrupted power to the DWL-8220AP access point.
After changing its active link, the access point reboots and loads new configuration information
to ensure proper configuration and security. MobileLAN services are temporarily disrupted by
the link change. Dual-homed connections are not required but are recommended. See also
bias.
EAP
Extensible Authentication Protocol. A general point-to-point protocol that supports multiple
authentication mechanisms. Defined in RFC 2284, EAP has been adopted by IEEE 802.1X in
an encapsulated form for carrying authentication messages in a standard message exchange
between a user (client) and an authenticator. The encapsulated EAP, also known as EAP
over LAN (EAPoL) and EAP over Wireless (EAPoW), enables the authenticator's server to
authenticate the client with an authentication protocol agreed upon by both parties. See also
EAP type.
EAPoL
EAP over LAN. An encapsulated form of the Extensible Authentication Protocol (EAP),
defined in the IEEE 802.1X standard, that allows EAP messages to be carried directly by a
LAN media access control (MAC) service between a wireless client (or supplicant) and an
authenticator. EAPoL is also known as EAP over Wireless (EAPoW). See also EAP.
D-Link Systems, Inc.
Appendix D - Glossary
417