Bucket Depth Function that determines cell bursts. ACR Allowed Cell Rate ADTF ACR Decrease Time Factor ATM Asynchronous Transfer Mode. Fixed-length cells allow cell processing to occur in hardware, thereby reducing transit delays. CCR Current Cell Rate CDF Cell Decrease Factor CDVT Cell Delay Variation Tolerance. Concepts and Definitions Congestion is the increase in cell rate to the network until throughput is negatively impacted.
Congestion results in discarded traffic.
Congestion occurs on WAN Switching network trunks that route more connections than they have bandwidth to support. Overbooking is the practice of routing more connections over a trunk than a trunk can support by adjusting one or more connection parameters. Overbooking allows carriers to route many times the traffic supported by a T3 over the T3 trunk. Overbooking results in network congestion if all connections routed over the T3 trunk are in use and actively transmitting data at the same time. Policing is the function implemented at the 'edge' of the WAN Switching network in BXM line cards that enforces the compliance of every ATM connection to the negotiated traffic contract.