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

Glossary
X.Series (X.##) CCITT recommendations
Glossary
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V.24 The CCITT recommendation that defines the
function of the interchange circuits between a DTE
and a DCE.
validation The process of ascertaining whether the
network transport configuration file has been
correctly configured. In guided NMMGR, you do this
by pressing the Validate Netxport key.
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 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.
Workstation Configurator A utility (TTUTIL)
that allows users to create customized terminal and
printer types by entering data through a series of
VPLUS screens.
X.3 Defines the user facilities that should be
internationally available from the packet
assembler/disassembler (PAD) facility when this is
offered by a public data network.
X.21 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 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 local user group (LUG).
X.25 iX System Access The software that works in
conjunction with the DTC/X.25 Network Access
software to provide 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 (residing on
the HP 3000 host), and the DTC/X.25 Network
Access. DTC/X.25 Network Access is configured
through use of the OpenView DTC Manager
software for systems using PC-based network
management or through NMMGR for systems using
host-based network management.
X.29 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 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 the
operation of terminal equipment and interfaces.