D-Link DWL-8500AP Product Manual - Page 164

D-Link Unified Access Point Administrator's Guide 802.11e task group. A subset of 802.11e features is described in the WMM specification. R RADIUS The Remote Authentication Dial-In User Service (RADIUS) provides an authentication and accounting system. It is a popular authentication mechanism for many ISPs. RC4 A symmetric stream cipher provided by RSA Security. It is a variable key-size stream cipher with byte-oriented operations. It allows keys up to 2048 bits in length. RSSI The Received Signal Strength Indication (RSSI) an 802.1X value that calculates voltage relative to the received signal strength. RSSI is one of several ways of measuring and indicating radio frequency (RF) signal strength. Signal strength can also be measured in mW (milliwatts), dBms (decibel milliwatts), and a percentage value. RTP Real-Time Transport Protocol (RTP) is an Internet protocol for transmitting real-time data like audio and video. It does not guarantee delivery but provides support mechanisms for the sending and receiving applications to enable streaming data. RTP typically runs on top of the UDP protocol, but can support other transport protocols as well. Roaming In IEEE 802.11 parlance, roaming clients are mobile client stations or devices on a wireless network (WLAN) that require use of more than one Access Point (AP) as they move out of and into range of different base station service areas. IEEE 802.11f defines a standard by which APs can communicate information about client associations and disassociations in support of roaming clients. Router A router is a network device which forwards packets between networks. It is connected to at least two networks, commonly between two local area networks (LANs) or between a LAN and a wide-area network (WAN), for example, the Internet. Routers are located at gateways-places where two or more networks connect. A router uses the content of headers and its tables to determine the best path for forwarding a packet. It uses protocols such as the Internet Control Message Protocol (ICMP), Routing Information Protocol (RIP), and Internet Router Discovery Protocol (IRDP) to communicate with other routers to configure the best route between any two hosts. The router performs little filtering of data it passes. RTS A request to send (RTS) message is a signal sent by a client station to the access point, asking permission to send a data packet and to prevent other wireless client stations from grabbing the radio waves. This message is a part of the IEEE 802.11 CSMA/CA protocol. (See also RTS Threshold and CTS.) RTS Threshold The RTS threshold specifies the packet size of a request to send (RTS) transmission. This helps control traffic flow through the access point, and is especially useful for performance tuning on an access point with a many clients. S Shared Key A shared key is used in conventional encryption where one key is used both for encryption and decryption. It is also called secret-key or symmetrickey encryption. Also see Public Key. SSID The Service Set Identifier (SSID) is a thirty-two character alphanumeric key that uniquely identifies a 164 © 2001-2008 D-Link Corporation. All Rights Reserved.