Fabric OS Reference Manual

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IU Information Unit. An individual set of information as defined by higher-level
process protocol definition, or upper-level protocol mapping.
JBOD Just a Bunch Of Disks. A number of disks connected in a single chassis to
one or more controllers. See also RAID.
K28.5 Special 10-bit character used to indicate beginning of transmission words
that perform fibre channel control and signaling functions. First seven bits
are comma pattern. See also Comma.
L_Port Loop Port. Node or fabric port that can use loop protocol or fabric protocol.
See also Non-participating mode, Participating mode.
Latency Time required to transmit a frame, from the time sent until time of arrival.
Link As applies to fibre channel, a physical connection between two ports,
consisting of both transmit and receive fibres. See also Circuit.
Link services Protocol for link-related actions.
LIP Loop Initialization Primitive. The signal used to begin initialization in a loop.
Indicates either loop failure or resetting of a node. See also Loop
initialization.
Loop failure Loss of signal within a loop for any period of time, or loss of synchronization
for longer than the time-out value. See also E_D_TOV.
Loop initialization Logical procedure used by L_Ports to discover environment. Can be used to
assign AL_PA addresses, detect loop failure, or reset a node. See also LIP.
Loop_ID Hex value representing one of 127 possible AL_PA values in a loop.
Looplet Set of devices connected in a loop to a port that is part of another loop.
LPSM Loop Port State Machine. Logical entity that performs arbitrated loop
protocols and defines behavior of L_Ports when they require access to an
arbitrated loop.
LWL Long wavelength fibre-optic cable. Based on 1300 nm lasers supporting
1.0625 Gbps link speeds. Connectors are color-coded blue. See also SWL.
MIB Management Information Base. SNMP structure that provides configuration
and device information to assist with device management.