HP StorageWorks Fabric OS 5.0.0 Diagnostics and System Error Messages Reference Guide (AA-RW1SA-TE, May 2005)

398 Glossary
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.
beacon
A tool in which all of the port LEDs on a switch are set to flash from one side of the switch to the other, to enable
identification of an individual switch in a large fabric. A switch can be set to beacon by a CLI command or through
Advanced Web Tools.
BISR
Built-in self-repair.
BIST
Built-in self-test.
broadcast
The transmission of data from a single source to all devices in the fabric, regardless of zoning. See also multicast.
buffer-to-buffer flow control
Management of the frame transmission rate in either a point-to-point topology or in an arbitrated loop. See also
BB_Credit.
cascade
Two or more interconnected Fibre Channel switches. See also fabric, ISL.
CHAP
Challenge-Handshake Authentication Protocol. Allows remote servers and clients to securely exchange authentication
credentials. Both the server and client are configured with the same shared secret. See also DH-CHAP.
chassis
The metal frame in which the switch and switch components are mounted.
Class 1 service
The class of frame-switching service for a dedicated connection between two communicating ports (also called
connection-oriented service). Includes acknowledgement of frame delivery or nondelivery.
Class 2 service
A connectionless class of frame-switching service that includes acknowledgement of frame delivery or nondelivery.
Class 3 service
A connectionless class of frame-switching service that does not include acknowledgement of frame delivery or
nondelivery. Can be used to provide a multicast connection between the frame originator and recipients, with
acknowledgement of frame delivery or nondelivery.
Class 4 service
A connection-oriented service that allows fractional parts of the bandwidth to be used in a virtual circuit.
Class 6 service
A connection-oriented multicast service geared toward video broadcasts between a central server and clients.