Specifications

Glossary
964 Fabric OS Version 3.1.x/4.1.x Reference Guide
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 error.
Loop Initialization
The logical procedure used by an L_Port to discover its environment. Can be used to assign AL_PA
addresses, detect loop failure, or reset a node.
Loop_ID
A hex value representing one of the 127 possible AL_PA values in an arbitrated loop.
Looplet
A set of devices connected in a loop to a port that is a member of another loop.
LPSM
Loop Port State Machine. The logical entity that performs arbitrated loop protocols and defines the
behavior of L_Ports when they require access to an arbitrated loop.
LWL
Long Wavelength. A type of fiber optic cabling that is based on 1300-mm lasers and supports link
speeds of 1.0625 Gbps. May also refer to the type of GBIC or SFP.
See also SWL.
Master Port
As relates to trunking, the port that determines the routing paths for all traffic flowing through the
trunking group. One of the ports in the first ISL in the trunking group is designated as the master
port for that group.
See also ISL Trunking.
Media
See transceiver.
MIB
Management Information Base. An SNMP structure to help with device management, providing
configuration and device information.