Summary
Communication between various localized networks is complex due to differences in digital signal hierarchies, encoding techniques, and multiplexing strategies. The SONET format allows different types of signal formats to be transmitted over the fiber-optic cable. The PDH includes all ITU TDM hierarchies including the T-carrier and E-carrier systems. OC-N refers to the optical SONET transmission characteristics of an Nth level transmission link, and STS-N refers to the electrical SONET transmission characteristics of an Nth level transmission link. The four SONET optical interface layers are the path, line, section, and the photonic layers. Path termination, line termination, and section termination occur at these various layers.
SONET ...
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