User manual

Glossary
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Glossary
L
laser Light Amplification through Simulated Emissions of Radiation. A
device that uses the oscillation of atoms or molecules between energy
levels to generate a narrow, finely focused beam of light. The light has
a single wavelength or narrow spectrum of wavelengths and is
matched in phase and frequency.
LED Light-emitting diodes (LEDs) on switch FRUs and the front bezel that
provide visual indicators of hardware status or malfunctions.
latency When used in reference to a Fibre Channel switching device, latency
refers to the amount of time elapsed between receipt of a data
transmission at a switch’s incoming F_Port (from the originating
node port) to retransmission of that data at the switch’s outgoing
F_Port (to the destination N_Port). The amount of time it takes for
data transmission to pass through a switching device.
LIN See link incident.
link Physical connection between two devices on a switched fabric.
link incident A link incident is a problem detected on a fiber optic link, like the loss
of light, invalid sequences and other problems.
link incident alerts A user notification, such as a graphic symbol in the hardware view
that indicates that a link incident has occurred.
LIP See loop initialization primitive.
load balancing Ability to evenly distribute traffic over multiple interswitch links
within a fabric. Load balancing on McDATA switches takes place
automatically.
log A record, as of the performance of a machine or the progress of an
undertaking.
logical unit number Also known as LUN. In Fibre Channel addressing, a logical unit
number is a number assigned to a storage device which, in
combination with the storage device’s node port’s world-wide name,
represents a unique identifier for a logical device on a storage area
network.