|
| Plan B Network Services |
It is our choices that show what we truely are,
far more than our abilities. |
|
|
|
| |
Plan B Net ATM consists of an access circuit into the Plan B Net network from each of your sites and onward connections across the network to all the destination sites. Data is carried over PVCs (permanent virtual connections or circuits) - dedicated pathways through the network, set up by Plan B Net between your sites. Plan B Net ATM is a national service, with nodes in the USA. Although dynamic flow control is left to the end devices, the amount of data allowed onto the network is regulated by Plan B Net, using three parameters that you specify for each PVC.
The sustained cell rate (SCR) is the long-term data throughput available under normal network conditions. Traffic can burst above the SCR up to the peak cell rate (PCR) - the maximum short-term cell rate supported. When the long-term load offered exceeds the SCR, a mechanism called usage parameter control (UPC) may discard cells, requiring them to be resent.
Traffic exceeding the PCR is discarded at the point of ingress into the Plan B Net Data Network, also using UPC. The maximum burst size (MBS) is the maximum number of cells that your end device can offer to the network at the PCR and still remain within the traffic contract.
The SCR, PCR and MBS form the basis of a traffic contract between Plan B Network Services and you. These contracts allow the network to deliver traffic fairly and predictably. Plan B Net ATM offers very high bandwidths and is designed to cope with applications that generate bursty traffic. It is thus particularly appropriate for interconnecting LANs or computers at different sites around the world. It offers high efficiency, very low network delay and protocol-transparent transmission. |
|
|
|
