D-Link DWL-8500AP Product Manual - Page 156

D-Link Unified Access Point Administrator's Guide sequence spread spectrum, etc.). • The optional Traffic Indication Map (TIM) identifies stations, using power saving mode, that have data frames queued for them. Authentication Code (CBC-MAC) for encryption and message integrity. AES-CCMP requires a hardware coprocessor to operate. Bridge A connection between two local area networks (LANs) using the same protocol, such as Ethernet or IEEE 802.1X. Broadcast A Broadcast sends the same message at the same time to everyone. In wireless networks, broadcast usually refers to an interaction in which the access point sends data traffic in the form of IEEE 802.1X Frames to all client stations on the network. CGI The Common Gateway Interface (CGI) is a standard for running external programs from an HTTP server. It specifies how to pass arguments to the executing program as part of the HTTP request. It may also define a set of environment variables. A CGI program is a common way for an HTTP server to interact dynamically with users. For example, an HTML page containing a form can use a CGI program to process the form data after it is submitted. Some wireless security modes distinguish between how unicast, multicast, and broadcast frames are encrypted or whether they are encrypted. See also Unicast and Multicast. Broadcast Address See IP Address. BSS A basic service set (BSS) is an Infrastructure Mode Wireless Networking Framework with a single access point. Also see extended service set (ESS) and independent basic service set (IBSS). BSSID In Infrastructure Mode, the Basic Service Set Identifier (BSSID) is the 48-bit MAC address of the wireless interface of the Access Point. C CCMP Counter mode/CBC-MAC Protocol (CCMP) is an encryption method for 802.11i that uses AES. It employs a CCM mode of operation, combining the Cipher Block Chaining Counter mode (CBC-CTR) and the Cipher Block Chaining Message Channel The Channel defines the portion of the radio spectrum the radio uses for transmitting and receiving. Each 802.11 standard offers a number of channels, dependent on how the spectrum is licensed by national and transnational authorities such as the Federal Communications Commission (FCC), the European Telecommunications Standards Institute (ETSI), the Korean Communications Commission, or the Telecom Engineering Center (TELEC). CSMA/CA Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) is a low-level network arbitration/contention protocol. A station listens to the media and attempts to transmit a packet when the channel is quiet. When it detects that the channel is idle, the station transmits the packet. If it detects that the channel is busy, the station waits a random amount of time and then attempts to access the media again. CSMA/CA is the basis of the IEEE 802.11e Distributed Control Function (DCF). See also RTS and CTS. The CSMA/CA protocol used by 802.11 networks is a variation on CSMA/CD (used by Ethernet networks). In CSMA/CD the emphasis is on collision 156 © 2001-2008 D-Link Corporation. All Rights Reserved.