Telserv Manual

Telserv Manual—427174-009
Glossary-1
Glossary
This glossary defines terms used both in this manual and in other Telserv or TELNET
manuals. Both industry-standard terms and HP NonStop terms are included.
broadcast. A packet delivery system that delivers a copy of a given packet to all hosts that
attach to it is said to broadcast the packet. Broadcast may be implemented with
hardware or software.
CCITT (International Telegraph and Telephone Consultative Committee). A division of
the United Nations International Telecommunications Union that coordinates
standards-setting activities.
Class A. The network number is 1 through 127 (1 octet); that is, the first octet is in the
range 1–127. The remaining three octets in the address are used for the subnet
number and host number.
Class B. The network number is 128 through 191.255 (2 octets); that is, the first octet is in
the range 128–191, the second octet is in the range 0–255. The remaining two octets
are used for the subnet number and host number.
Class C. The network number is 192.0.0 through 255.255.255 (3 octets); that is, the first
octet is in the range 192–255, the second octet is in the range 0–255, and the third
octet is in the range 0–255. The remaining octet is used for the subnet number and
host number.
connection. The path between two protocol modules that provides reliable stream delivery
service. In the Internet, a connection extends from a TCP module on one machine to a
TCP module on another machine.
connectionless service. Characteristic of the packet delivery service offered by most
hardware and by the Internet Protocol (IP). The connectionless service treats each
packet or datagram as a separate entity that contains the source and destination
address. Usually, connectionless services can drop packets or deliver them out of
sequence.
Distributed Systems Management (DSM). A set of tools used to manage NonStop™
systems and EXPAND networks. These tools include the ViewPoint console
application, the Subsystem Control Facility (SCF) for data communications
subsystems, the Subsystem Programmatic Interface (SPI), the Event Management
Service (EMS), the Distributed Name Service (DNS), and token-oriented programmatic
interfaces to the management processes for various NonStop subsystems.
Dynamic System Configuration (DSC). A facility that allows system managers to make
online changes to the configuration of devices and controllers. Its interactive utility
program is called the Configuration Utility Program (COUP).