Sunday, December 4, 2005

Cisco CRS-1 Adds IP-over-DWDM

Cisco Systems announced over IP over Dense Wavelength Division Multiplexing (IPoDWDM) on its CRS-1 Carrier Routing System, enabling integration between the IP layer and the optical transmission layer. Cisco said the capability will help service providers increase the throughput of existing DWDM infrastructures from 10Gbps to 40Gbps to efficiently manage traffic growth from video/IPTV services.


The Cisco IPoDWDM integration strategy features three key integration points: Element Integration, Control Integration, and Management Integration.


Element integration minimizes optical-electrical-optical conversions in the network to reduce expensive stand-alone transponders and complex electrical switching equipment. Cisco today is introducing two interfaces for the CRS-1 with integrated transponder functionality, enabling the CRS-1 to originate fully tunable ITU-grid compatible wavelengths. The new interfaces feature two industry firsts:

  • a one-port 40 Gbps tunable DWDM Packet-over-SONET (POS) interface that is designed to be compatible with existing 10 Gbps DWDM systems.


  • a four-port 10 Gbps Gigabit Ethernet Tunable DWDM PHY interface with SONET/SDH-like Operations, Administration, Maintenance and Provisioning (OAM&P).


Both interfaces support enhanced integrated Forward Error Correction (FEC) providing up to a 5X increase in reach and 50 percent reduction in optics. The interfaces are fully compatible with the Cisco ONS 15454 Multiservice Transport Platform (MSTP) and are also designed to interoperate with any existing installed DWDM infrastructure.


Control integration enables providers to migrate from a manual provisioning process to a dynamic service activation provisioning process. Cisco is announcing the Segmentation model of GMPLS (S-GMPLS) available on the CRS-1.


S-GMPLS leverages the power of GMPLS IP control protocols for auto-configuration of wavelengths while keeping the topology of the routing domain isolated from the topology of the DWDM domains, providing a way to deploy GMPLS while respecting organizational boundaries.


Management integration provides flexible operating models designed to enable separate management of the IP and the DWDM equipment by separate operating groups, and, alternatively, to enable providers to deploy a unified management model to achieve operational cost efficiencies and reduce time to service deployment. The CRS-1 supports integration with third-party interfaces through Extensible Markup Language (XML) and Simple Network Management Protocol (SNMP).


"Comcast's and Cisco's shared vision of integrated 10 Gbps and 40 Gbps DWDM interfaces was one of the key reasons for our selection of the CRS-1," said Vik Saxena, Comcast Director of IP Architecture. "As we move to transport all services over IP, including broadcast video and video on demand, cost-effectiveness, scalability, reliability, and service flexibility become critical."http://www.cisco.com
  • In 2004, Cisco introduced OC768c optical interfaces on the CRS-1, delivering 40 Gbps trunking for high capacity terabit POPs and central offices and also launched its Reconfigurable Optical Add/Drop Multiplexers (ROADMs), which integrate photonic switching into optical multiplexers.

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