HP Surestore 64 - Director Switch User Manual page 234

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
Interruption to link due to loss of light or other causes.
load balancing
Ability to evenly distribute traffic over multiple interswitch links within a fabric. Load
balancing on directors takes place automatically.
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.
218 Glossary