Carrier Ethernet Over SDH/SONET
As data services continue to grow there’s an increased need for data capabilities in transport network. This include features like connection-oriented Ethernet, Traffic Engineering, Hierarchical QoS, 50ms protection switching in packet networks, and end-to-end OAM.
However across the world there is a huge deployment of SDH/SONET and many services continue to be TDM based (including point-to-point Ethernet leased lines). It’s not possible for service providers to throw away all these investments and deploy new greenfield networks.
In order to address the need for sophisticated packet processing on SDH/SONET networks, Tejas brings in Carrier Ethernet Switching blades for it’s SDH/SONET porfolio. These blades bring the latest advances in packet transport technologies into your networks with feature sets targeted towards data centric applications like 3G/Wimax backhaul, Broadband, IPTV and Enterprise Data Services.
These blades support the option to transport ethernet as either Ethernet over SDH/SONET or as Ethernet over native fiber. Ethernet over SDH/SONET is realized by GFP,LCAS based EoS mappers built into the blades. The optical Ethernet over native fiber is realized by using the optical GigE ports on these blades which can be configured as aggregate interfaces. The EoS and EoFiber links can even be bundled together using Link Aggregation to give higher speed links between two switching locations.
These blades are interoperable at a feature level with the TJ2000 series of Tejas Carrier Ethernet Switches. Thus for example ERPS will work with a consisting of a mix of ELAN04 blades and TJ2030 switches. Thus an end-to-end Carrier Ethernet network can be rolled out, parts of which run over native fiber and others over SDH/SONET.
Tejas Future Proof Architecture also enables migration of a transport network from 100% TDM to 100% packet in a phased manner and with incremental investments. In Phase 1, most of the traffic is TDM and some Data. In this phase it’s best to deploy the Carrier Ethernet network over SDH/SONET. In Phase 2, when the SDH/SONETbandwidth has exhausted, mostly due to Data growth, the service provider uses another fiber pair or CWDM to roll out another packet ring over the same infrastructure. If a few GigE ports on ELAN blades are free, then no additional investment is required at this stage, except in case of fiber exhaust, when a passive CWDM mux might be required. In Phase 3, when most of the traffic is Data and there’s a little legacy TDM, the packet infrastructure can be expanded and the few TDM circuits migrated using Circuit Emulation.
