FACTOID # 151: The five countries with the highest coffee consumption are also the five countries whose citizens trust one another the most. Coincidence? Probably.
 
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SDH may refer to:


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SDH - definition of SDH in Encyclopedia (505 words)
Both SDH and SONET are widely used today; SONET in the U.S. and Canada, SDH in the rest of the world.
SDH was made possible by the existence of atomic clocks.
The STS-3 signal is also used as a basis for the SDH hierarchy, where it is designated STM-1 (synchronous transmission module one).
Synchronous optical networking - Wikipedia, the free encyclopedia (658 words)
SDH is growing in popularity and is currently the main concern with SONET now being considered as the variation.
SONET differs from PDH in that the exact rates that are used to transport the data are tightly synchronized to network based clocks.
The STS-3 signal is also used as a basis for the SDH hierarchy, where it is designated STM-1.
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