User Manual

Psion Teklogix 9160 Wireless Gateway User Manual E-23
Appendix E: Glossary
RC4
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.
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.
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.