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Local F_Port
The F_Port to which an N_Port is directly attached by a link (see remote F_Port).
LOGI
Log in.
Logical unit
A target resident entity that implements a device model and executes SCSI commands sent by an application
client.
Logical unit identifier
Identifier used by an initiator to reference the logical unit.
Login_BB_Credit
On FC-AL, equal to the number of receive buffers that a receiving NL_ port must have available when a loop
circuit is established. Login_BB_Credit is discovered in the PDISC or PLOGI protocol.
LOGO
Log out.
LOL
Loss of light.
Loop Tenancy
The period of time beginning when a port wins arbitration and ending when it receives a CLS in response to its
own CLS, or forwards a CLS transmitted to it.
Loop_ID
7-bit values numbered contiguously from 0 to 126 decimal and representing the 127 legal hard addresses on a
loop (not all of the 256 possible AL_PAs are used in FC-AL for reasons related to running disparity). Loop_IDs
correspond to the 7-bit SEL word in SFF-8045 used for specifying hard addresses. Decimal 127 (7F hex) is not
a valid Loop_ID, but is used to signify that no hard address is being assigned to an NL_Port.
Loopback
A mode of FC-1 operation in which the information passed to the FC-1 transmitter for transmission is shunted
directly to the FC-1 receiver, overriding any signal detected by the receiver on its attached fibre.
LR
Link Reset primitive sequence.
LRR
Link Reset Response primitive sequence.
LS_ACC
Link Service Accept.
LW
Long wavelength.
Fibre Channel Interface Manual, Rev. D
377
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