Troubleshooting Terminal, Printer, and Serial Device Connections - Edition 5 (32022-90058)

Glossary
X.Series (X.##) CCITT recommendations
Glossary
129
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 Network Access
software to provide MPE/iX access to X.25. The
software resides on an HP 3000 host and is
configured through use of NMMGR. To configure
access to an X.25 network, you must configure two
software components: the X.25 iX System Access and
the DTC/X.25 Network Access (residing on the
Datacommunications and Terminal Controller and
configured at the OpenView Windows Workstation).
Together, these two components provide a network
connection on HP 3000 systems to private and public
X.25 packet-switched networks (PSNs).
X.29 The protocol that defines the interface for data
exchange between a packet-mode DTE and a remote
Packet Assembly/Disassembly (PAD) facility over a
packet-switching network.
XON/XOFF protocol The flow control used by
MPE/iX systems to protect against data overruns.
XON/XOFF protocol is controlled by the data
recipient who sends an XOFF character (ASCII
DC3) to the sender if it is unable to continue to
receive data. The sender suspends transmission
until it receives an XON character (ASCII DC1).
X.Series (X.##) CCITT recommendations A set
of recommendations for data communication
networks governing their services, facilities, and
terminal equipment operation and interfaces.