August 2016 Glossary 293
Invokable
A function of Fibre Channel that allows a feature to be used between an initiator and
a recipient (such as cartridge subsystem). Thus, if a feature or parameter is invoked,
the recipient must implement and respond to the feature or parameter.
IP
See Internet Protocol.
IPI
See Intelligent Peripheral Interface.
ips
Inches per second, a tape movement measurement.
IU
See Information Unit.
J
Jitter
The deviation of timing in an exchange.
L
L_Port
It is either an FL_Port or an NL_Port.
Laser
A term meaning Light Amplification by Stimulated Emission of Radiation. Laser
devices generate coherent radiation in the visible, ultraviolet, and infrared portions of
the electromagnetic spectrum. Regarding FC, lasers can be transmitting either short
waves or long waves, depending on the composition of the arbitrated loop or fabric.
LC connector
A standard connector for 2 Gbps Fibre Channel data transfer. This type of connector
is used on fiber-optic cables.
LIFO
Last in first out.
Link
A two-fiber connection made between two FC ports in which one fiber is
transmitting, the other receiving, information.
Link Bit
The link bit allows the initiator to “link” or continue the input/output process. This
bit allows devices that support command linking to indicate to the initiator that the
command was accepted by returning a status of “Intermediate” to the initiator.
Link Service
The set of commands used by FC to manage functions such as port management,
login/logout, and abort operations. There are both basic and extended link services,
which StorageTek cartridge tape subsystems support.
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