Using the Node Management Services (NMS) Utilities (32022-90053)

Glossary 303
Glossary
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.
device class A collection of
devices that have some
user-defined relation. Device
classes are assigned through use
of the NMMGR configuration
utility.
device-dependent
characteristic A file
specification for which
modifications are restricted
because of the type of device on
which the file is opened. For
example, data directed to
terminals must have a blocking
factor of one.
device driver Software module
that controls a specific type of
input/output device including
NS 3000/iX links.
devicefile A file being input to or
outputfromanyperipheraldevice
except a disc. MPE allows
operations to be performed on the
device itself as if it were a file.
device independence A
characteristic of the operating
system that allows users to
selectively redirect input/output
from a program, session, or job
without regard to the nature of
the device.
device name See PAD name.
Dial ID protocol A proprietary
Hewlett-Packard protocol that
provides security checking and
address exchange for dial links.
dial link A connection made
through public telephone lines.