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

XPath OS 7.4.x command reference guide 283
Glossary
This glossary defines terms used in this guide or related to this product and is not a comprehensive
glossary of computer terms.
address identifier A 24-bit or 8-bit value used to identify the source or destination of a frame.
AL_PA Arbitrated Loop Physical Address. A unique 8-bit value assigned during loop initialization to a
port in an arbitrated loop.
AL_TIME Arbitrated loop timeout value. Twice the amount of time it would take for a transmission word
to propagate around a worst-case loop. The default value is 15 milliseconds (ms).
alias A logical grouping of elements in a fabric. An alias is a collection of port numbers and
connected devices, used to simplify the entry of port numbers and WWNs when creating
zones.
alias address
identifier
An address identifier recognized by a port in addition to its standard identifier. An alias
address identifier can be shared by multiple ports. See also alias.
alias AL_PA An AL_PA value recognized by an L_Port in addition to the AL_PA assigned to the port. See
also AL_PA.
alias server A fabric software facility that supports multicast group management.
ANSI American National Standards Institute.
ARB Arbitrative primitive signal. Applies only to an arbitrated-loop topology. Transmitted as the fill
word by an L_Port to indicate that the port is arbitrating access to the loop.
arbitrated loop A shared 100-Mb/s Fibre Channel transport structured as a loop. Can support up to 126
devices and one fabric attachment. See also topology.
arbitration A method of gaining orderly access to a shared-loop topology.
area number Ports on a switch are assigned a logical area number. Port area numbers can be viewed by
entering the switchShow command. They are used to define the operative port for many
Fabric OS commands; for example, area numbers can be used to define the ports within an
alias or zone.
ARP Address Resolution Protocol. A TCP/IP function for associating an IP address with a link-level
address.
ARR Asynchronous response router. Refers to Management Server GS_Subtype Code E4, which is
displayed in the portLogDump command output.
ASD Alias server daemon. Used for managing multicast groups by supporting the create, add,
remove, and destroy functions.
ASIC Application-specific integrated circuit.
ATM Asynchronous Transfer Mode. A transport used for transmitting data over LANs or WANs that
transmit fixed-length units of data. Provides any-to-any connectivity and allows nodes to
transmit simultaneously.
authentication The process of verifying that an entity in a fabric (such as a switch) is what it claims to be. See
also digital certificate, switch-to-switch authentication.
AW_TOV Arbitration wait timeout value. The minimum time an arbitrating L_Port waits for a response
before beginning loop initialization.
bandwidth The total transmission capacity of a cable, link, or system. Usually measured in bps (bits per
second). Bandwidth can also refer to the range of transmission frequencies available to a link
or system. See also throughput.
BB_Credit buffer-to-buffer credit. The number of frames that can be transmitted to a directly connected
recipient or within an arbitrated loop. Determined by the number of receive buffers available.
See also buffer-to-buffer flow control, EE_Credit.