Psion Teklogix 9160 G2 Bedienungsanleitung PDF herunterladen (Seite 421)

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Appendix D: Glossary

ToS

Psion Teklogix 9160 G2 Wireless Gateway User Manual D-71

ToS

TCP/IP packet headers include a 3-to-5 bit Type of Service (ToS) field set by the application

developer that indicates the appropriate type of service for the data in the packet. The way

the bits are set determines whether the packet is queued for sending with minimum delay,

maximum throughput, low cost, or mid-way “best-effort” settings depending upon the

requirements of the data. The ToS field is used by the 9160 G2 Wireless Gateway to provide

configuration control over Quality of Service (QoS) queues for data transmitted from the AP

to client stations.

UDP

The User Datagram Protocol (UDP) is a transport layer protocol providing simple but

unreliable datagram services. It adds port address information and a checksum to an IP

packet.

UDP neither guarantees delivery nor does it require a connection. It is lightweight and

efficient. All error processing and retransmission must be performed by the application

program.

Unicast

A Unicast sends a message to a single, specified receiver. In wireless networks, unicast

usually refers to an interaction in which the access point sends data traffic in the form of

IEEE 802.1x Frames directly to a single client station MAC address on the network.

Some wireless security modes distinguish between how unicast, multicast, and broadcast

frames are encrypted or whether they are encrypted.

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