OTN-Switched Network Core: Significant Advantages to Network Operators

An OTN-switched network core, as shown in the following illustration, offers significant advantages to network operators with multiple customers and service types. It allows traffic to be groomed down to the ODU0 level to optimize overall bandwidth usage, resulting in substantial reduction to both CAPEX and OPEX.

“The ability to switch at the OTN layer means more flexible service provisioning end-to-end and minimal chance of blocking. Microsemi’s DIGI OTN processors in Apollo’s Fabric Interface cards provide a centralized switching architecture for complete flexibility in the OTN infrastructure, eliminating blocking and providing any-to-any connectivity at an ODU0 level.”
—Jimmy Mizrahi, VP of Product Management at ECI

The cards are connected to the OTN and packet switch fabric of the packet-optical transport platform, enabling a high-capacity switching system. The DIGI device interfaces to the optics and the Fabric Interface Chip (FIC) and performs the OTN processing functions. As the DIGI device is a platform solution, it is able to be used on both the client and line cards that interface to the fabric. On the line cards, the DIGI device enables a hybrid OTN/packet switching system by interfacing to and multiplexing both OTN and packet traffic for simultaneous transport over the same wavelength, thus maximizing 100G WDM utilization and providing a high degree of flexibility and cost savings for the service provider to optimally handle different traffic types.

On the client cards, the DIGI device can support a variety of protocols including OTN, Ethernet, SONET, and Fiber Channel. Hybrid OTN/packet switching capabilities are also supported with DIGI-based client cards. Such client cards can support natively terminating Ethernet clients to send packets to the FIC while simultaneously sending OTN traffic to the FIC from OTN clients on the same card. In addition, DIGI OTN processors can support hitless ODUflex re-sizing and adjustment as per the G.HAO (ITU-T G.7044) standard. G.HAO enables service providers to dynamically scale the available bandwidth for packet services based on their network’s capacity requirements and traffic patterns.

Read the full case study on Optical Transport Networking (OTN) Processors.

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