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credit method

The credit procedure is a procedure for flow control in Fibre Channel and StarFabric. Fibre Channel distinguishes between buffer-to-buffer credit( BBC) for link flow control and end-to-end credit for flow control between two end devices.

In this isametric method, credits are assigned for the entire network. If a credit is available, a sender can place a message on the network. When the message arrives at the receiver, new credits are issued.

Fibre Channel flow control

Fibre Channel flow control

The number of credits a receiver awards is equal to the number of data packets the sender is allowed to transmit to the receiver. For example, if the receiver has granted the sender a credit of 6, then the sender can transmit six data packets to the receiver without a buffer overflow occurring. After that, he must abort the transmission and wait for the new credits.

Informations:
Englisch: credit method
Updated at: 10.02.2006
#Words: 140
Links: procedure, flow control, StarFabric, buffer-to-buffer credit (BBC), buffer-to-buffer credit (BBC)
Translations: DE
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