HP StorageWorks XPath OS 7.4.X MIB Reference Guide (AA-RVHEC-TE, September 2005)

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Nx_Port
A node port that can operate as either an N_Port or NL_Port.
OFC
Open fiber control. A method used to enable and disable laser signaling for higher-intensity laser
transceivers.
ordered set
A transmission word that uses 8b/10b mapping and begins with the K28.5 character. Ordered sets occur
outside of frames and include the following items:
• Frame delimiters, which mark frame boundaries and describe frame contents.
• Primitive signals, which indicate events.
• Primitive sequences, which indicate or initiate port states.
Ordered sets are used to differentiate Fibre Channel control information from data frames and to manage
frame transport.
originator
The Nx_Port that originated an exchange.
oversubscription
A situation in which more nodes could potentially contend for a resource than the resource could
simultaneously support (typically an ISL). Oversubscription could be a desirable attribute in fabric
topology, as long as it does not produce unacceptable levels of congestion.
packet
A set of information transmitted across a network. See also frame.
parallel
The simultaneous transmission of data bits over multiple lines.
Performance Monitoring
An HP StorageWorks switch feature that monitors port traffic and includes frame counters, SCSI read
monitors, SCSI write monitors, and other types of monitors.
persistent error log
Error messages of a high enough level (by default, Panic or Critical) are saved to flash memory on the
switch instead of to RAM. These messages are saved over reboots and power cycles, constituting the
persistent error log. Note that each CP on a HP StorageWorks Core Switch 2/64 has its own unique
persistent error log.
PLOGI
Port login. The port-to-port login process by which initiators establish sessions with targets. See also frame.
point to point
A Fibre Channel topology that employs direct links between each pair of communicating entities. See also
topology.
port
In an HP StorageWorks switch environment, an SFP or GBIC receptacle on a switch to which an optical
cable for another device is attached.