>>SDH is a transport hierarchy based on multiples of 155.52 Mbit/s
>>The basic unit of SDH is STM-1:
STM-1 = 155.52 Mbit/s
STM-4 = 622.08 Mbit/s
STM-16 = 2588.32 Mbit/s
STM-64 = 9953.28 Mbit/s
>>Each rate is an exact multiple of the lower rate therefore
the hierarchy is synchronous.
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