In effect, the IMUX-A45 buffers should always be empty. Each virtual path or circuit must individually be configured to operate within the bandwidth available. To control both cell loss and CDV via source shaping, all data circuits must have both a sustainable rate and peak rate control. This may result in less than optimum performance, as the NxT1 rate must be divided among the connections' SCR settings. The CAC software must be aware that a limit on the bandwidth exists in order to control circuit rates.
Some switches allow configuration of available bandwidth on a per-port basis.
To control overall rate, simply set this to the equivalent rate of the NxT1 link. A trunk or path must be established, then its maximum bandwidth set. Unfortunately, some switches tie CAC bandwidth management directly to the physical rate of the UNI port. In this case, to avoid congestion and cell loss, the user must explicitly control the bandwidth used by all applications passing through the NxT1 link. This solution is not well-suited to public network interfaces, where the applications are not under the control of the network provider.