As Ethernet takes its place as the access and aggregation infrastructure of choice, and as carriers cap their investment in legacy TDM, ATM, and Frame Relay technologies, there is a growing need to connect these existing deployments across the new Ethernet infrastructure. The standards-based technique for achieving this is known as Pseudo-Wire Emulation (PWE), referring to the concept of extending the equivalent of a TDM or ATM 'Wire' across IP/MPLS. Applications include connecting ATM 'Islands' across an MPLS backbone such as ATM access nodes for business services, or the evolution of wireless backhaul from TDM or ATM to Ethernet as bandwidth needs increase as part of 3G deployments. Riverstone Networks will introduce PWE functionality in phases across the 15K product line.
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