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leaky bucket

A technique used in ATM networks at the switch level that applies a sustained cell flow rate to bursty traffic. Incoming data flows into a buffer (the "bucket"), then "leaks" out at a steady rate, which is designated as constant bit rate (CBR) traffic. In the event the in-flow exceeds the negotiated rate for a certain time, the buffer will overflow. At that point, the switch examines the Cell Loss Priority (CLP) bit in each cell, and low-priority cells are discarded and retransmitted by the originating device. See leaky bucket counter.

leaky bucket counter

A fault detection technique that adds "1" to a counter for each operation taken and periodically decrements the counter to keep it from overflowing. If the operation were to occur more times than normal within a short time period, the counter would overflow, causing an alert to be generated. See leaky bucket and fault isolation.

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