IBM SAN32M1, Installation And Service Manual

Page: 589 / 626

557 Glossary
light-emitting diode LED. A semiconductor chip that emits visible or infrared light when
electricity passes through it. LEDs are used on switch or director
field-replaceable units (FRUs) and the front bezel to provide visual
indications of hardware status or malfunctions.
LIN See link incident .
link Physical connection between two devices on a switched fabric. A link
consists of two conductors, one used for sending and the other for
receiving, thereby providing a duplex communication path.
link incident
LIN. Interruption to link due to loss of light or other causes. See also
link incident alerts .
link incident alerts A user notification, such as a graphic symbol in the Element Manager
application Hardware View that indicates that a link incident has
occurred. See also
link incident .
Link Incident Log
Director or switch Link Incident Log. Log displayed through the Ele-
ment Manager application that provides a history of Fibre Channel
link incidents (with associated port numbers) for an individual direc-
tor or switch. The information is useful to maintenance personnel for
isolating port problems (particularly expansion port (E_Port) seg-
mentation problems) and repair verification. See also
Audit Log ;
Event Log ; Hardware Log ; Threshold Alert Log .
LMA
See loader/monitor area .
load balancing
Ability to evenly distribute traffic over multiple interswitch links
within a fabric. Load balancing on IBM directors and switches takes
place automatically.
loader/monitor area LMA. Code that resides in the loader/monitor area of the control pro-
cessor (CTP) card. Among other functions, LMA code provides I/O
functions available through the maintenance port, operator panel,
server interface, terminal window command functions, power up
diagnostics, field-replaceable unit (FRU) power-on hours update, and
data read/write control, and LMA code/licensed internal code (LIC)
download functions (D).
local Synonym for channel-attached .