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synchronous transfer mode (STM)

Synchronous Transfer Mode (STM) is a standardized method for transmitting a group of different data streams synchronized over a clock.

STM-1 data frame

STM-1 data frame

This STM method is used by carriers to identify time slots or channels within a T1 or E1 line.

The synchronous transmission mode is divided into hierarchy levels. Synchronous Digital Hierarchy ( SDH) modulo 1 (STM-1) is the first hierarchy level and represents a 2,430 byte transmission frame transmitted at 155.520 Mbps over optical fiber with OC-3. The other hierarchy levels are defined by STM-n and range up to 40 Gbit/s with STM-256.

Englisch: synchronous transfer mode - STM
Updated at: 11.10.2013
#Words: 92
Links: method, data, clock (CLK), transmission system 1 (WAN) (T1), E1 line (E1)
Translations: DE

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