Psion Teklogix 9160 G2 Manual de usuario descargar pdf (Pagina 417)

Appendix D: Glossary

Router

Psion Teklogix 9160 G2 Wireless Gateway User Manual D-67

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. RTP typically runs on top of

the UDP protocol, but can support other transport protocols as well.

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.)

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