logical
unit
number
(LUN).
An
identifier
used
on
a
SCSI
bus
to
distinguish
among
up
to
eight
devices
(logical
units)
with
the
same
SCSI
ID.
loop.
A
closed
unidirectional
signal
path
connecting
input/output
devices
to
a
system.
LUN.
See
logical
unit
number
.
M
management
information
base
(MIB).
Simple
Network
Management
Protocol
(SNMP)
units
of
managed
information
that
specifically
describe
an
aspect
of
a
system,
such
as
the
system
name,
hardware
number,
or
communications
configuration.
A
collection
of
related
MIB
objects
is
defined
as
a
MIB.
MB.
see
Megabyte
.
megabyte.
A
unit
of
measure
for
storage
capacity.
For
main
storage,
1
megabyte
equals
1
048
576
bytes
(1024
x
1024);
for
auxiliary
storage
(disk,
diskette,
and
tape),
1
megabyte
equals
1
000
000
bytes
(1000
x
1000).
megahertz
(MHz).
A
unit
of
measure
of
frequency.
One
megahertz
equals
1
000
000
hertz.
MES.
See
miscellaneous
equipment
specification
.
MHz.
See
megahertz
.
MIB.
See
management
information
base
.
mirroring
cluster.
See
geographic
cluster
.
miscellaneous
equipment
specification
(MES).
Any
equipment
that
is
added
after
the
time
of
the
initial
order.
modulation.
(1)
The
process
by
which
a
characteristic
of
a
carrier
is
varied
in
accordance
with
a
characteristic
of
an
information-bearing
signal
(T).
(2)
The
process
by
which
a
message
signal
is
impressed
upon
a
carrier
signal
so
that
the
carrier
is
altered
to
represent
the
message
signal.
multicast
address.
A
type
of
IP
address,
which
identifies
a
group
of
interfaces
and
permits
all
of
the
systems
that
are
in
that
group
to
receive
the
same
packet
of
information.
multimode
optical
fiber.
(1)
A
graded-index
or
step-index
optical
fiber
that
allows
more
than
one
bound
mode
to
propagate
(E).
Contrast
with
single-mode
optical
fiber
.
(2)
In
FDDI,
an
optical-fiber
waveguide
usually
characterized
by
a
core
diameter
of
50
-
100
microns
that
will
allow
a
large
number
of
modes
to
propagate.
multiplexing.
In
data
transmission,
a
function
that
permits
two
or
more
data
sources
to
share
a
common
transmission
medium
so
that
each
data
source
has
its
own
channel
(A)
(I).
N
N.
See
newton
.
NAS.
See
network-attached
storage
.
NetBIOS.
A
standard
interface
to
networks,
IBM
personal
computers
(PCs),
and
other
compatible
PCs.
It
is
used
on
LANs
to
provide
message,
print-server,
and
file-server
functions.
Application
programs
that
use
NetBIOS
need
not
manage
the
details
of
LAN
data-link-control
protocols.
network-attached
storage
(NAS).
A
task-optimized
storage
device
directly
attached
to
a
network
that
operates
independently
of
the
general-purpose
file
servers.
Network
File
System
(NFS).
A
protocol,
developed
by
Sun
Microsystems,
Incorporated,
that
allows
any
host
in
a
network
to
mount
another
host’s
file
directories.
After
a
file
directory
is
mounted,
it
appears
to
reside
on
the
local
host.
network
information
services
(NIS).
A
set
of
UNIX
network
services
(for
example,
a
distributed
service
for
retrieving
information
about
the
users,
groups,
network
addresses,
and
gateways
in
a
network)
that
resolve
naming
and
addressing
differences
among
computers
in
a
network.
322
NAS
Gateway
500
Administrator’s
Guide
Summary of Contents for TotalStorage NAS Gateway 500
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