Abstract
Transmission technologies are crucial to the automatic electric power systems in the smart grids. The goal is the higher bandwidth and reliability, just as in power line communication, microwave transmission, and the latest optical fiber communication. Based on the time division multiplexing, the fiber communication develops from the plesiochronous digital hierarchy and the synchronous digital hierarchy to optical transport network. The system can transmit the signal securely through hard pipes. Based on the synchronous digital hierarchy, optical transport network and the packet transport technologies, the MS-OTN is expected to offer secure, reliable, and flexible transmission for future electric power services.
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