Comparison of PDH and SDH/SONET interfaces It is important to note that PDH signals can be synchronously multiplexed to the next hierarchical level without difficulty. However, it must be appreciated that the add and drop feature applies only to the complete PDH signal. Subportions of the PDH signal (e.g., one of the 45-Mb/s tributaries […]
The Fundamentals of SONET Overview In 1985, Bellcore proposed the idea of an optical carrier-to-carrier interface that would allow the interconnection of different manufacturers’ optical equipment. This was based on a hierarchy of digital rates, all formed by the interleaving of a basic rate signal. The idea of a Synchronous Optical NETwork (SONET) attracted […]
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