Priority control
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Priority control is a term used in relation to the traffic in an ATM network.
The need for police action occurs in an ATM network when traffic flow exceeds the negotiated rate (in the traffic contract) and the buffer overflows. Each ATM cell header has a CLP (Cell Loss Priority) bit used to identify cells as either conforming (to the contract) or nonconforming. If cells are nonconforming - for example, more cells than the contract allows - the ATM switch sets the CLP bit to one. This cell can now be transferred through the network only if there is sufficient network capacity. If there is not enough bandwidth available, the nonconforming cell is discarded and may need to be retransmitted [1]. This process is known as Priority Control.
[edit] See also
- Asynchronous Transfer Mode (ATM)
- Broadband Networks
- Teletraffic engineering in broadband networks
- Traffic Contract
