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link
A physical connection (electrical or optical) between two nodes of a network.
logical path
A relationship between a channel and control unit that designates the physical path to
be used for device-level communication between each entity, defined by a link address
assigned to each entity.
magnetic tape
A tape with a magnetizable layer on which data can be stored. (T)
magnetic tape drive
A mechanism for moving magnetic tape and controlling its movement.
MB
Megabytes or 1,000,000 bytes for disk or tape storage but 1,048,576 (2
memory capacity.
menu
A list of options displayed to the user by a data processing system, from which the
user can select an action to be initiated. (T)
microcode
A code, representing the instructions of an instruction set, that is implemented in a
part of storage that is not program-addressable. (IBM)
multi mode
A graded-index or step-index optical fiber that enables more than one bound mode to
propagate. (E) Contrast with single mode.
multimode fiber
An optical fiber designed to carry multiple signals, distinguished by frequency or
phase, at the same time.
N_Port
A port that connects a node to a fabric or to another node.
net mask
A 32-bit, or 4-byte number, in dotted decimal format (typically written as four
numbers separated by periods, such as 255.255.0.0 or 255.255.255.0) that is applied to
an IP address to identify the network and node address of a host or router interface.
(Synonymous with subnet mask.)
network
An arrangement of nodes and branches that connects data processing devices to one
another through software and hardware links to facilitate information interchange.
nexus
A connection that exists between an initiator, a target, and a logical unit. This is where
one initiator port talks to one target port, addressing one LUN and together they
execute a task.
Glossary-8
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