Troubleshooting Terminal, Printer and Serial Device Connections - Edition 4 (32022-90030)

132 Glossary
Glossary
required to adhere to a CCITT
recommendation, although most
do so in their own interests.
CIB The channel input/output
bus in the backplane of an
HP 3000.
circuit-switching network A
type of data communications
network wherein a physical and
exclusive link is maintained
between two communicating
devices for the call duration. An
all-digital, circuit-switching
network is often referred to as an
X.21 network.
closed user group An X.25
user facility that allows
communication to and from a
pre-specified group of users and
no one else.
compatibility mode A
processing mode on HP 3000
Series 900 computers that allows
applications written for MPE
V/E-based systems to be ported
and run without changes or
recompilation.
computer network AA group of
computer systems connected in
such a way that they can
exchange information and share
resources.
configuration 1) The way in
which computer equipment is
physically interconnected and set
up to operate as a system. 2) The
layout of the computer system,
including the MPE table, memory,
and buffer sizes, that tells which
peripheral devices are (or can be)
connected to the computer and
how they can be accessed. 3) The
process of defining the
characteristics of a network in
software.
For MPE/iX-based computers,
the operating systems are
configured through use of the
SYSGEN utility.
Next, the Distributed Terminal
Subsystem (DTS) link is
configured by using NMMGR
(running on the host) and can, in
addition, be configured using the
OpenView DTC Manager
software (running on the
OpenView Windows
Workstation) depending on the
type of network management you
use.
A system that is to run network
services (NS 3000/iX) is
configured through use of
NMMGR.
Access to X.25 is configured in
two parts. The X.25 MPE/iX
System Access software is
configured on the host through
use of NMMGR. The DTC/X.25
Network Access software
residing on the DTC is configured
at the OpenView Windows
Workstation through use of the
OpenView DTC Manager.
configuration file The
configuration file contains the
information that the network
needs in order to operate. This file
also contains information