Fiber-optic communications on the way to carrier and utility grade packet transport networks.

Migration of Smart Grid Fiber Optic SDH Communication solutions to Carrier und Utility grade Packet Transport Networks


Typical High voltage NG SDH Communication Network

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    Today – Synchronous Digital Hierarchy (SDH) plus Plesiochronous Digital Hierarchy (PDH) access multiplexer solutions.

    Today, SDH solutions in combination with PDH access multiplexer are used mostly by utilities for the communication requirements in high-voltage networks. Siemens offers for these demands the latest generation of SDH equipment, commonly referred to as NG (Next Generation) SDH systems or Multi-Service Provisioning Platforms (MSPP). NG SDH technology combines a number of benefits that makes it still well-suited to the needs of power utilities. Among those benefits are high availability, comprehensive manageability, and monitoring features. Ethernet-over-SDH provides the capacity to transport packet-based traffic over the SDH backbone with high reliability and low latencies. State-of-the-art NG SDH systems are highly integrated, providing the requested capabilities for utilities in a single device. At the subscriber side there is still a need to operate a number of different systems with conventional communication interfaces in today’s substations (e.g., FXS, FXO, E&M, V.24, X.21, etc.). For this purpose, so-called PDH access multiplexers are used, which provide the requested interfaces, bundle the communication signals, and pass them on to the NG-SDH systems..

    Migration to highly available (carrier and utility grade) Multi-Protocol Label Switching (MPLS) networks

    The SDH technology, combined with PDH multiplexer, is a well-proven solution for the manifold communication requirements of the transmission utilities. But meanwhile new requirements arise, which clearly identify the limits of the SDH / PDH technology. Especially the demand for further cost savings, above all the OPEX part, is the main challenge for the communication departments of the utilities. At the same time, the portion of packet-based data (Ethernet and IP) in the wide area networks, caused by new Ethernet- and IP-based systems (e.g., new IEC 104 RTUs, IEC61850 protection systems, sensors, IP telephony, IP CCTV, etc.) is increasing dramatically.

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