STM-1

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The STM-1 (Synchronous Transport Module) is theSDH ITU-T fiber optic network transmission standard. It has a bit rate of 155.52 Mbit/s. The other levels are STM 4, STM 16 and STM 64. Beyond this we have wavelength-division multiplexing (WDM) commonly used in submarine cabling.

[edit] Frame Structure

Image:SDH STM1 Frame.JPG