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

Glossary
medium attachment unit
Glossary
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medium attachment unit A device attached to a
ThickLAN coaxial cable that provides the physical
and electrical connection from the AUI cable to the
coaxial cable.
MIB Management Information Base. A database of
information about a network node used by SNMP.
MIT Master Installation Tape. Magnetic tape
containing the fundamental operating system for a
HP 3000 Series 900 computer.
modem Modulator/demodulator. A device that
modulates and demodulates signals. Primarily used
for modulating digital signals onto carriers for
transmission and for performing the inverse
function at the receiving end. Modems are essential
for transmitting and receiving digital signals over
telephone lines.
modulo Value used as the counting cycle for
determining the send sequence number (N(S)) of
frames sent across an X.25 network.
modulation Process in which certain
characteristics of a carrier signal are altered in
accordance with the changes of an
information-bearing signal.
MPE/iX MultiProgramming Executive/ integrated
POSIX. The operating system of HP 3000 Series 900
computers. The NS 3000/iX network services operate
in conjunction with the MPE/iX operating system.
multiplexer A device that allows multiple
communication links to use a single channel.
nailed device A device with a permanently
associated ldev that was assigned through the
NMMGR configuration of the host system on which
the association is established. Nailed devices can be
accessed programmatically through their ldev
number. In contrast, non-nailed devices have ldev
numbers that are assigned from a pool of available
ldev numbers for the life of their connection to a
system.
native mode The run-time environment of MPE/iX.
In Native Mode, source code has been compiled into
the native instruction set of the HP 3000 Series 900
computer.
neighbor gateway A gateway that is in the same
network as a given node.
NetIPC Network Interprocess Communication.
Software that enables programs to access network
transport protocols
network A group of computers connected so that
they can exchange information and share resources.
network address This can be either 1) the network
portion of an IP address as opposed to the node
portion, or 2) when referring to X.25 networks, it is a
node’s X.25 address.
network boundary The logical division between
networks in an internetwork.
network directory A file containing information
required for one node to communicate with other
nodes in 1) an internetwork, 2) an X.25 network, or
3) a network that contains non-HP nodes. The active
network directory on a node must be named
NSDIR.NET.SYS.
network interface NI. The collective software that
enables data communication between a system and
a network. A node possesses one or more network
interfaces for each of the networks to which it
belongs. Network interface types are LAN,
point-to-point (router), X.25, token ring, SNA,
loopback, and gateway half. The maximum number
of supported NIs is 12, one of which is reserved for
loopback.
network management The collective tasks
required to design, install, configure, maintain, and
if necessary, change a network.
network map A drawing that shows the topology of
the network. For networks managed by the
OpenView DTC Manager, a network map must be
created using the OVDraw capability provided with
the management software. A network map is also a
hardcopy drawing used when planning a network. It
shows network topology, node and network names,
addresses, network boundaries (for an internetwork
map), and link types.
Network Services NS. Software application
products that can be used to access data, initiate
processes, and exchange information among nodes in
the network. The NS 3000/iX Network Services
include RPM, VT, RFA, RDBA, and NFT.