Telserv Manual

Glossary
Telserv Manual—427174-009
Glossary-4
interactive command
licensed to use a dedicated range of MAC addresses. That way, each controller is
guaranteed it own unique address.
interactive command. See also programmatic command. In DSM, a command entered
by a human operator rather than by a program.
object-name template. See also wild-card character. In DSM, a name that stands for
more than one object. Such a name includes one or more wild-card characters, such
as * and ?.
object. In general NonStop use, one or more of the devices, lines, processes, and files in a
NonStop subsystem; any entity subject to independent reference or control by one or
more subsystems.
open system. Any computer system that adheres to the OSI standards.
Open Systems Interconnection (OSI). A set of standards used for the interconnection of
heterogeneous computer systems, thus providing universal connectivity.
OSI Reference Model. A communications architecture, adopted by the ISO in 1984, that
includes seven layers that define the functions involved in communications between
two systems, the services required to perform these functions, and the protocols
associated with these services.
packet switching. A technique in which messages are broken into smaller units, called
packets, that can be individually addressed and routed through the network. The
receiving-end node ascertains whether all the packets are received and in the proper
sequence before forwarding the complete message to the addressee.
packet. The unit of data sent across a packet switching network. While some Internet
literature uses it to refer specifically to data sent across a physical network, other
literature views the Internet as a packet switching network and describes IP datagrams
as packets.
PCT. The PC6530 interactive terminal interface program that can be used for
communication between a NonStop S- Series host and a PC. Abbreviation for the
PC6530 terminal emulator program.
physical layer. Layer 1 in the OSI Reference Model. This layer establishes the actual
physical connection between the network and the computer equipment. Protocols at
the physical layer include rules for the transmission of bits across the physical medium
and rules for connectors and wiring.
process. A running entity that is managed by the operating system, as opposed to a
program, which is a collection of code and data. When a program is taken from a file
on a disk and run in a processor, the running entity is called a process.
programmatic command. In DSM, a command issued by a program rather than by a
human operator.