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Fibre Channel Interface Manual, Rev. D 365
Beginning Running Disparity
The Running Disparity present at a transmitter when Encoding of the Special Code associated with an Ordered
Set is initiated, or at a receiver when Decoding of the Special Character associated with an Ordered Set is ini-
tiated.
BER
See Bit error rate.
Bit error rate (BER)
The statistical probability of a transmitted bit being erroneously received in a communication system. The BER
is measured by counting the number of erroneous bits at the output of a receiver and dividing by the total num-
ber of bits.
Bit synchronization
The state in which a receiver is delivering retimed serial data at the required BER.
Block
A upper level construct of application data related to a single Information Category and transferred within a sin-
gle Sequence.
BNC
Acronym for a Bayonet-Neil-Councilman Coaxial Cable Connector. Specifications for BNC style connectors are
defined in EIA/TIA 403-A and MIL-C-39012.
BSY
Busy.
Buffer
A logical construct which holds the contents of a single frame.
Byte
An eight-bit entity with its least significant bit denoted as bit 0 and most significant bit as bit 7. The most signifi-
cant bit is shown on the left side in FC-PH, unless specifically indicated otherwise. Bytes are packed four per
32-bit word, or eight per 64-bit word.
Cable plant
All passive communications elements (e.g., optical fibre, twisted pair, or coaxial cable, connectors, splices,
etc.) between a transmitter and a receiver.
CATV
Central Antenna Television.
CClTT
Comite Consultatif International, Telegraphique et Telephonique (see ITV-TS).
CDB
Command descriptor block.