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Glossary
126 EN/LZT 108 6492 R2 - October 2003
- T -
T1.413
The American National Standards Institute (ANSI) standard for asymmetric
digital subscriber line using discrete multitone modulation, which the G.dmt
standard is based on.
TCP
Abbreviation of Transmission Control Protocol, and pronounced as
separate letters. TCP is one of the main protocols in TCP/IP networks.
Whereas the IP protocol deals only with packets, TCP enables two hosts to
establish a connection and exchange streams of data. TCP guarantees
delivery of data and also guarantees that packets will be delivered in the
same order in which they were sent.
TCP/IP
Short for Transmission Control Protocol / Internet Protocol, the suite of
communication protocols used to connect hosts on the Internet.
Telnet
A terminal emulation program for TCP/IP networks such as the Internet.
The Telnet program runs on your computer and connects your PC to a
server on the network. You can then enter commands through the Telnet
program and they will be executed as if you were entering them directly on
the server console.
TFTP
Short for Trivial File Transfer Protocol. A protocol for file transfers. TFTP is
easier to use than the File Transfer Protocol (FTP) but is not as capable or
secure.
TTL
Short for Time To Live. A field in an IP packet that limits the life span of that
packet. Originally meant as a time duration, the TTL is usually represented
instead as a maximum hop count; each router that receives a packets
decrements this field by one. When the TTL reaches zero, the packet is
discarded.
- U -
UDP
Short for User Datagram Protocol, which is a connectionless transport
service that dispenses with the reliability services provided by TCP. UDP
gives applications a direct interface with IP and the ability to address a
particular application process running on a host via a port number, without
setting up a connection session.