HP StorageWorks 2/140 embedded web server user guide - Page 134
If a port is bypassed, all serial channel signals route past the port. A device attached to the port
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Glossary 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. Contrast with unblocked connection. See also connectivity attribute; dynamic connection; dynamic connectivity. blocked port In a Director or Switch, the attribute that when set, removes the communication capability of a specific port. A blocked port continuously transmits the offline sequence. buffer Storage area for data in transit. Buffers compensate for differences in processing speeds between devices. See also buffer-to-buffer credit. buffer-to-buffer credit BB_Credit. (1) The maximum number of receive buffers allocated to a transmitting node port (N_Port) or fabric port (F_Port). Credit represents the maximum number of outstanding frames that can be transmitted by that N_Port or F_Port without causing a buffer overrun condition at the receiver. (2) The maximum number of frames a port can transmit without receiving a receive ready signal from the receiving device. BB_Credit can be adjustable to provide different levels of compensation. bus The path that carries data between the computer (microprocessor) and peripheral devices. An IDE interface cable and a small computer system interface (SCSI) cable are both examples. bypassed port If a port is bypassed, all serial channel signals route past the port. A device attached to the port cannot communicate with other devices in the loop. cascade Linking two or more Fibre Channel switches to form a larger switch or fabric. The switched link through fiber cables attached between one or more expansion ports (E_Ports). See also expansion port channel (1) A system element that controls one channel path, and whose mode of operation depends on the type of hardware attached. Each channel controls an I/O interface between the channel control element and the attached control units (D). (2) Point-to-point link that transports data from one point to the other. (3) A connection or socket on the motherboard to controller card. A motherboard may have only one or two channels (primary and secondary). If a motherboard has only one channel, it may be necessary to add a controller card to create a secondary channel. Glossary-4 embedded web server user guide