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Appendix D: Glossary
ToS
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.
U
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.
See also
Multicast
and Broadcast.
URL
A Uniform Resource Locator (URL) is a standard for specifying the location of objects on
the Internet, such as a file or a newsgroup. URLs are used extensively in HTML documents
to specify the target of a hyperlink which is often another HTML document (possibly stored
Psion Teklogix 9160 G2 Wireless Gateway User Manual
D-71
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