Configuring and Managing Host-Based X.25 Links - Edition 6 (36939-90057)

Glossary
destination node name
Glossary
221
Windows Workstation) depending on the type of
network management you use. If any of the NS link
products are installed on the system, network
configuration is accomplished through use of
NMMGR and, if PC-based X.25 connections are
required, through the OpenView DTC Manager.
configuration file he configuration file, which you
create and update using the NMMGR utility,
contains:
1) the information that the network needs in order to
operate.
2) Information necessary for link-level and NetIPC
logging.
3) Information required to connect terminals and
printers to the system through one or more DTC.
The only file name that the system recognizes as the
configuration file is NMCONFIG.PUB.SYS.
control-X echo Three exclamation marks (!!!)
output to the terminal screen when the cancel
character (normally
[
CTRL]-X
) is entered.
control-Y trap User-written procedure to which
control is passed when the subsystem break
character (normally
[CTRL]-Y
) is entered during
execution of a program with subsystem break
enabled.
cross-validate The process of assuring that
information contained in two locations is consistent
where it is imperative that it be consistent. For
example, an automatic cross-validation occurs when
you enter SYSGEN to assure that information
contained in NMCONFIG.PUB.SYS agrees with system
configuration data.
CSMA/CD Carrier Sense Multiple Access with
Collision Detect, transmission access method used
by the IEEE 802.3 LAN standard.
CSN See circuit-switching network.
CTB The cache transfer bus in the backplane of an
HP 3000.
CUG See closed user group.
data Basic elements of information that can be
processed or produced by a computer.
Datacommunications and Terminal Controller
See DTC.
data overrun Transmitted data that is sent faster
than the equipment on the receiving end is capable
of receiving it. The resulting overflow data is lost.
See also flow control.
Datapac The national public PSN of Canada.
Datex-P The national public PSN of West Germany.
D bit Delivery confirmation bit. Used in the X.25
protocol, the setting of the D bit in DATA packets
indicates whether delivery acknowledgment of the
packet is required from the local DCE or from the
remote DTE. It therefore allows the choice between
local and end-to-end acknowledgment.
DCE Data circuit-terminating equipment. The
interfacing equipment required in order to interface
to data terminal equipment (DTE) and its
transmission circuit. Synonyms: data
communications equipment, dataset.
DDX The national public PSN of Japan.
dedicated printer A printer that can be used by
only one host on the LAN; the one specified in the
Destination Node Name in that printer's
configuration screen.
default gateway One (and only one) gateway
accessible by a system may be designated as a
default gateway. The network will then send any
transmitted messages for which it is unable to locate
a destination through normal means to the default
gateway in a final effort to determine a transmission
route.
demodulation The process by which the
information-bearing signal is retrieved from a
modulated carrier wave. The inverse of modulation.
destination node name In DTS configuration, it is
either 1) the name of a host that a user can be
connected to by default (if switching is not enabled
for that user, or if automatic modem connection is
enabled), or 2) the name of the only host that can
access a dedicated printer.