Buffer credits
Encyclopedia
Buffer credits, also called buffer-to-buffer credits (BBC) are used as a flow control method by Fibre Channel
technology and represent the number of frames a port can store.
Each time a port transmits a frame that port's BB Credit is decremented by one; for each R RDY received, that port's BB Credit is incremented by one. If the BB Credit is zero the corresponding node cannot transmit until an R_RDY is received back.
The benefits of a large data buffer are particularly evident in long distance applications, when operating at higher data rates (2Gbit/s, 4Gbit/s), or in systems with a heavily loaded PCI
bus.
Fibre Channel
Fibre Channel, or FC, is a gigabit-speed network technology primarily used for storage networking. Fibre Channel is standardized in the T11 Technical Committee of the InterNational Committee for Information Technology Standards , an American National Standards Institute –accredited standards...
technology and represent the number of frames a port can store.
Each time a port transmits a frame that port's BB Credit is decremented by one; for each R RDY received, that port's BB Credit is incremented by one. If the BB Credit is zero the corresponding node cannot transmit until an R_RDY is received back.
The benefits of a large data buffer are particularly evident in long distance applications, when operating at higher data rates (2Gbit/s, 4Gbit/s), or in systems with a heavily loaded PCI
Peripheral Component Interconnect
Conventional PCI is a computer bus for attaching hardware devices in a computer...
bus.