August 2016 Glossary 285
Arbitrated Loop
A topology in Fibre Channel that provides multiple connections for devices that
share a single loop, over which only two devices can communicate at once. Similar to
the SCSI protocol of the same name, it provides an “arbitrate and win” scenario
between more than two devices when those devices want to communicate on the bus.
The sending device must arbitrate and win the connection with the receiving device
before communication can begin.
Arbitrated Loop Physical Address
A one-byte value that identifies a port in an arbitrated loop topology.
arbitration
Any process by which a user of a shared resource negotiates with other users for the
right to use the resource. A port connected to a shared bus must win arbitration
before it transmits data on the bus.
Asynchronous Event Notification
A form of communication used between processes to notify a process of an
asynchronous action, such as an input/output activity or message transmission.
B
b
The abbreviation for bit.
B
The abbreviation for byte.
BB_Credit
See Buffer-to-Buffer Credit.
Buffer Size
The amount of storage space allocated to the buffer, which is a storage space reserved
temporarily for a given purpose. In Fibre Channel, this buffer is usually larger than a
single frame, up to the size of an entire sequence.
Buffer-to-Buffer Credit
This is a value which is managed by the R_RDY primitive signal on a link, and is
used by a transmitter to determine the permission to transmit frames. If permission is
granted by the recipient, this value also tells the transmitter how many are permitted.
The transmitter may transmit a frame when Available BB_Credit is greater than 0.
This differs from End_to_End Credit.
Buffer-to-Buffer
A method of transferring information in which neither the initiator nor receiver of the
information knows the contents.
Byte
A group of eight bits.
C
CDB
Command descriptor block. A structure for SCSI commands.
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