A single SDH frame is called a Synchronous Transmission Module (STM-1). Transmitted
over a duration of 125 µs, the frame consists of 2430 octets organized as 9 rows of 270 octets each. A single octet in an SDH frame represents a 64 kbps channel (8 bits every 125µs), several octets can be aggregated to form containers for larger data rates.
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