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Appendix E: Glossary
ToS
E-28
Psion Teklogix 9160 G2 Wireless Gateway User Manual
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