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

312 Glossary
Glossary
used when planning a network. It
shows network topology, node and
network names, addresses,
network boundaries (for an
internetwork map), and link
types.
mapping A set of characteristics
that describe a route taken by
messages to reach a destination
node. This set of characteristics is
configured with NMMGR atevery
node on a point-to-point network.
One mapping is configured at
each node for every other node on
the network to which messages
will be sent.
MAU See medium attachment
unit.
M bit More data bit. Setting this
bit in a DATA packet indicates
that at least one more DATA
packet is required to complete a
message of contiguous data.
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.
MIT Master installation tape.
Magnetic tape containing the
fundamentaloperating systemfor
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 MUX. A device that
allows multiple communication
links to use a single channel.
N
nailed device A device with a
permanently associated ldev that
was assigned through the
NMMGRconfiguration 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.