HP Surestore 64 FW 05.01.00 and SW 07.01.00 HP StorageWorks Directors and Edge - Page 5

Glossary backplane The backplane provides 48 VDC power distribution and connections for all logic cards. backup FRU When an active field-replaceable unit (FRU) fails, an identical backup FRU takes over operation automatically (failover) to maintain director and Fibre Channel link operation. See also active FRU. BB_Credit See buffer-to-buffer credit. beaconing Use of light-emitting diodes on ports, port cards, field-replaceable units, and directors to aid in the fault-isolation process. When enabled, active beaconing causes LEDs to flash for selected components. BER See bit error rate. bezel A removable panel that covers empty drive bays and port cards. bidirectional In Fibre Channel, the capability to simultaneously communicate at maximum speeds (100 Mbps) in both directions over a link. bit error rate (BER) - Ratio of received bits that contain errors to total of all bits transmitted. blocked connection In S/390 mode, in a director or switch, the attribute that, when set, removes the communication capability of a specific port. A blocked address is disabled so that no other address can be connected to it. A blocked attribute supersedes a dedicated or prohibited attribute on the same address. See also allowed connection, unblocked connection, connectivity attribute, dynamic connection, and dynamic connectivity. blocked port Devices communicating with the port are prevented from logging into the director or communicating with other devices attached to the director. A blocked port continuously transmits the offline sequence. bridge Device that connects and passes packets between two network segments that use the same communications protocol. Directors and Edge Switches Glossary 5