McDATA Sphereon 4500, User Manual

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Glossary g-13
Glossary
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.
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.
loopback plug In a fiber optic environment, a type of duplex connector used to wrap
the optical output signal of a device directly to the optical input.
loopback test Test that checks attachment or control unit circuitry, without checking
the mechanism itself, by returning the output of the mechanism as
input.
LUN See logical unit number.
M
MAC address See Media Access Control address.
maintenance port Connector on the switch operator panel where a PC running an
ASCII terminal emulator can be attached or dial-up connection made
for specialized maintenance support.
managed product Hardware product that can be managed with the EFC Product
Manager. For example, the ES-3216 and ES-3232 Switches are
managed products. See also device.