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

156 Glossary
Glossary
VAN Value-Added Network. A
data communication network that
uses and pays for facilities
belonging to another carrier. The
value-added package is then sold
to a user.
VC See virtual circuit.
virtual circuit A logical
association between two
physically separate DTEs.
virtual circuit A logical
association between two
physically separate DTEs.
Virtual Terminal A network
service that allows a user to
establish interactive sessions on a
node.
VPLUS Software used to
generate screens such as those
displayed by NMMGR.
V-Series (V.##) CCITT A set of
CCITT recommendations related
to data communication over a
voice-grade telephone network.
VT See Virtual Terminal.
W
WAN Wide Area Network. A
data communications network of
unlimited size, used for
connecting localities, cities, and
countries.
Workstation Configurator A
utility available on MPE/iX
systems, TTUTIL.PUB.SYS, that
allows users to create customized
terminal and printer types by
entering data through a series of
VPLUS screens.
X
X.3 The protocol that defines
which user facilities should be
internationally available from a
packet assembler/disassembler
(PAD) when this is offered by a
public data network.
X.21 The protocol that defines the
physical interface between a DTE
and a DCE of a public data
network where the access to the
network is made over
synchronous digital lines.
X.25 The protocol that defines the
interface between a DTE and a
DCE for packet-mode operation
on a Public Data Network (PDN).
X.25 address The X.25 address
provided by the network
administration if you are
connected to a public data
network (PDN).
X.25 address key An X.25
address key is a label that maps a
node’s IP address to its X.25
address and its associated X.25
parameters. You have a combined
maximum of 1024 X.25 address
keys in the SVC and PVC path
tables.
X.25 LUG address X.25 address
of a node belonging to a LUG.
X.25 iX System Access The
software that works in
conjunction with the DTC/X.25