CBR

For applications such as voice and video that require high priority and have a known peak transmission rate. CBR guarantees bandwidth for constant bit rate traffic, very low cell loss, and very low delay.

For circuit-switched data paths, the Service Category parameter is set to the CBR option and cannot be changed.

RT-VBR

For time-sensitive applications, such as voice and video, that have unpredictable, bursty traffic characteristics. Guarantees very low cell loss and very low delay.

The NFM-P handles RT-VBR and NRT-VBR identically for routing and rerouting purposes, and uses both to calculate the total VBR bandwidth usage.

You cannot exceed the physical speed of the ATM interface when setting the traffic descriptors.

NRT-VBR

For applications such as video and frame relay that have known or predictable traffic characteristics. Guarantees low cell loss and low delay.

You cannot exceed the physical speed of the ATM interface when setting the traffic descriptors.

UBR

For applications that do not require guarantees of low cell loss or low delay. UBR paths emulate the connectionless services provided by conventional bridged and routed data networks.