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Glossary 119
Glossary
N_Port
A “Node” port. A Fiber Channel-defined hardware entity that performs data
communication over the FC-AL link. It is identifiable by a unique World Wide Name. It
can act as an originator or a responder.
N_Port Identifier
A unique address identifier by which an N_Port is uniquely known. It consists of a
Domain (most significant byte), an Area, and a Port, each 1-byte long. The N_Port
identifier is used in the Source Identifier (S_ID) and Destination Identifier (D_ID) fields
of an FC-AL frame.
Parent Hub
The HP SureStore E short-wave and long-wave hubs support a cascaded topology. In a
cascaded hub topology, the parent hub is the hub that is connected to the LAN
(ethernet). HP SureStore E hubs are configured as a parent or child hub through their
RS-232 interface.
Short Wave
Lasers or LEDs that emit light with wave lengths around 780 nm or 850 nm. Short-wave
lasers are used for FC-AL links up to approximately 700 meters. They are typically used
with multimode fiber. The preferred fiber core size is 50 micron because this fiber has
large bandwidth so that the distance is limited by the fiber attenuation. A 62.5-micron
core size is also supported for compatibility with existing FDDI installations. Fiber of
this type has smaller bandwidth and, in this case, the distance is limited by the fiber
bandwidth.
Topology
The physical or logical layout of nodes on a network. FC-AL topologies include point-to-
point, FC-AL, and fabric. The hub supports FC-AL topology.