August 2016 Glossary 295
LUN
Logical unit number. A SCSI device address.
M
MB
Abbreviation for megabyte (2
20
or 1,048,076 bits).
MB/s
Abbreviation for megabytes per second.
Mb/s
Abbreviation for megabits per second.
MB/sec
Abbreviation for megabytes per second.
Mb/sec
Abbreviation for megabits per second.
Mode Select Command
The command used in Fibre Channel that specifies operational parameters and
options for a logical unit. The fields that can be changed by the Mode Select
Command and what the default values are for these fields.
MSB
Most Significant Bit.
multi mode
A graded-index or step-index optical fiber that allows more than one bound mode to
propagate. Contrast with single mode.
multimode fiber
An optical fiber designed to carry multiple signals, distinguished by frequency or
phase, at the same time.
N
N_Port
A Port within the node that attaches to a link.
N_Port ID
The identifier of an N_Port in a point-to-point or fabric FC topology.
N_Port Login (PLOGI)
The N_Port Login command used in Extended Link Services. It is required when
originated by the initiator, requires a response by a drive, and is prohibited when
originated by a drive.
Nanometers (nm)
One billionth meters.
National Committee for Information Technology Standards
Formerly the American National Standards Institute (ANSI).
NCITS
See National Committee for Information Technology Standards.
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