Current trends in access and transport architectures for business customers

Virtual path group protection switching-A method for fast ATM network survivability

“…To preserve the reliability of services that migrate from a circuit transport paradigm to ATM cell-based transport and to help carriers develop new ATM-based services, fast ATM protection switching must be provided in ATM networks. 1 The virtual path group (VPG) protection switching technique described in this paper is a solution to the need for fast ATM network survivability. The VPG technique can protect large numbers of ATM virtual path (VP) connections and connection segments on the order of 60 ms.…”

“…1 As Figure 2 shows, several options exist for how ATM will be carried within SONET. In all cases, SONET will continue to provide the optical signal.…”