Carrier class access for Ethernet

Salira Optical Network Systems today announced what it claims is the first access architecture for Ethernet Passive Optical Networks that delivers affordable broadband services by extending the life of existing legacy TDM services.

Salira Optical Network Systems today announced what it claims is the first access architecture for Ethernet Passive Optical Networks (EPON) that delivers affordable broadband services by extending the life of existing legacy TDM services, while facilitating a migration to new opportunities in packet-based multi-services.

Salira’s architecture brings fundamental advances to the local access network by enabling Service Level Agreement (SLA) management, real time Dynamic Bandwidth Allocation (DBA) and remote service creation and subscriber management.

Despite the widespread movement toward IP-centric networks, many voice and data services, and their revenue streams, remain TDM-based. The Salira Architecture will support clear channel T1/E1 network access in addition to IP-centric network access at Fast Ethernet speed. The architecture will accommodate any combination of ATM, Frame Relay or voice, each in their native protocol.

‘In the current environment, carriers are looking for ways to preserve their investment in legacy systems while providing new revenue-generating services,’ said David Passmore, research director, The Burton Group. ‘Salira’s architecture enables service providers to extend the life of existing equipment while reducing the capital and operational expenditures associated with delivering broadband services.’

The Salira Access Architecture is composed of three interlocking components: an Access Operating System (AOS), a Service Abstraction Layer and an Access Management System.

At the core of the architecture is AOS. This is the software environment that delivers the hybrid capability to handle both TDM and Packet-based traffic. The architecture will recognise and transport TDM traffic in native or multi-protocol modes, which affords the traffic the benefits of constant bit rate without the overhead associated with cell or packet conversions.

For packet-based traffic, the architecture uses a distributed processor-based set of software modules to enforce Service Level Agreements (SLAs), invoke Quality of Service (QoS) parameters (such as traffic classification, shaping, policing, queuing and scheduling), and apply the real time Dynamic Bandwidth Allocation mechanisms needed to render the desired service or application.

Based on predetermined Class of Service (CoS) parameters, this same set of software modules co-ordinate the enforcement of SLAs while managing the system’s overall bandwidth demands in real time. A Quality of Service (QoS) engine manages and enforces CoS-driven QoS levels. By constantly monitoring traffic conditions, Salira’s real time Dynamic Bandwidth Allocation engine will recognise traffic profiles and re-assign bandwidth automatically to deliver against these CoS/QoS performance characteristics.

The Service Abstraction Layer will support the delivery of a variety of service applications like Multi-Protocol Transport, Premium Class of Service, IP VPN, Transparent LAN, High-Speed Internet and MPLS.

An Access Management System (AMS) provides Element Management, Service Creation and Subscriber Management capabilities that will interface with standardised billing systems, and support full history and reporting capability in a standard database. Additional capabilities include real time SLA monitoring and historical reporting at the port level. This enables the personalization of bandwidth and service to individual customers.