Configuring and Managing MPE/iX Internet Services (August 2002)

Glossary
X.25
Glossary
245
T
TAC Telnet Access Card. A board within a DTC 48
or 72MX.
TCP/IP Transmission Control Protocol/Internet
Protocol. A set of rules that establishes and
maintains connections between nodes on an
internetwork. TCP/IP regulates the flow of data,
breaks messages into smaller fragments if necessary
(and reassembles the fragments at the destination),
detects errors, and retransmits messages if errors
have been detected.
TEB Telnet Express Box. An HP product consisting
of a DTC dedicated to providing protocol conversion
between Telnet on TCP/IP and AFCP to allow
incoming calls from the Internet Services
environment to HP e3000 systems.
Telnet The application protocol offering virtual
terminal service in the Internet suite of protocols
developed by the Advanced Research Projects
Agency (ARPA).
TELNET.ARPA.SYS A file that contains the Telnet
client program.
TELNTDOC.ARPA.SYS The readme file for the
Telnet client program.
TFTP Trivial File Transfer Protocol, TFTP, a set of
rules used to read and write files to or from a remote
system.
U
UDP User Datagram Protocol, a set of rules used to
send connectionless messages called datagrams
between systems. UDP requires much less overhead
than a protocol such as TCP because it does not
require acknowledgement from the recipient that
the message reached its destination.
V
Virtual Terminal A network service that allows a
user to establish interactive sessions on a node.
W
WAN Wide Area Network. A data communications
network of unlimited size, used for connecting
localities, cities, and countries.
well-known address The port number that
identifies the specific user process of an available
and commonly-used Internet Service. For example,
the port number for the File Transfer Protocol (FTP)
is 21.
X
X.25 Defines the interface between a DTE and a
DCE for packet mode operation on a public data
network (PDN).