Telserv Manual

Glossary
Telserv Manual—427174-009
Glossary-7
Transmission Control Protocol/Internet Protocol
(TCP/IP)
participants must establish a connection. Software implementing TCP usually resides
on the operating system and uses the IP protocol to transmit information across the
Internet. It is possible to terminate (shut down) one direction of flow across a TCP
connection, leaving a one-way (simplex) connection. The Internet protocol suite is
often referred to as TCP/IP because TCP is one of the two most fundamental
protocols.
Transmission Control Protocol/Internet Protocol (TCP/IP). A protocol specification that
conforms to the latest DoD (Dept. of Defense) ARPANET standard. The TCP/IP
protocol module corresponds to Layers 3 and 4 of the ISO protocol model.
Trivial File Transfer Protocol (TFTP). The Internet standard protocol for file transfer with
minimal capability and minimal overhead. TFTP depends only on the unreliable,
connectionless datagram delivery service (UDP), so it can be used on machines like
diskless workstations that keep such software in ROM and use it to bootstrap
themselves.
wait mode. In the NonStop Kernel operating system, the mode in which the called
procedure waits for the completion of an I/O operation before returning a condition
code to the caller.
warning. In DSM interfaces, a condition encountered in performing a command or other
operation, that can be significant but does not cause the command or operation to fail.
A warning is less serious than an error.
well-known port. Any of a set of protocol ports preassigned for specific uses by transport
level protocols (that is, TCP and UDP). Servers follow the well-known port assignments
so clients can locate them. Examples of well-known port numbers include ports
assigned to echo servers, time servers, remote login (TELNET) servers, and file
transfer (FTP) servers.
wild-card character. A character that stands for any possible character(s) in a search string
or in a name applying to multiple objects. In DSM object-name templates, two wild-card
characters can appear: ? for a single character and * for zero, one, or more
consecutive characters.
X.25 network. Any network or subnetwork linked using X.25 standards. X.25 standards are
CCITT standards that define packet switching carrier communication in the Network
Layer over wide area networks (WANs).
X.25. The CCITT standard protocol for transport-level network service. Originally designed
to connect terminals to computers, X.25 provides a reliable stream transmission
service that can support remote login.
X.25 Access Method (X25AM). A NonStop product that implements, for WANs, the
services of the Network Layer and layers below
.