Difference From PDH
SDH differs from Plesiochronous Digital Hierarchy (PDH) in that the exact rates that are used to transport the data on SONET/SDH are tightly synchronized across the entire network, using atomic clocks. This synchronization system allows entire inter-country networks to operate synchronously, greatly reducing the amount of buffering required between elements in the network.
Both SONET and SDH can be used to encapsulate earlier digital transmission standards, such as the PDH standard, or they can be used to directly support either Asynchronous Transfer Mode (ATM) or so-called packet over SONET/SDH (POS) networking. Therefore, it is inaccurate to think of SDH or SONET as communications protocols in and of themselves; they are generic, all-purpose transport containers for moving both voice and data. The basic format of a SONET/SDH signal allows it to carry many different services in its virtual container (VC), because it is bandwidth-flexible.
Read more about this topic: Synchronous Optical Networking
Famous quotes containing the word difference:
“The difference of the English and Irish character is nowhere more plainly discerned than in their respective kitchens. With the former, this apartment is probably the cleanest, and certainly the most orderly, in the house.... An Irish kitchen ... is usually a temple dedicated to the goddess of disorder; and, too often, joined with her, is the potent deity of dirt.”
—Anthony Trollope (1815–1882)