STM-1

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The STM-1 (Synchronous Transmission Module) is the basic rate of transmission of the SDH ITU-T fiber optic network transmission standard. It has a bit rate of 155.52 Mbit/s and is the SDH equivalent of an OC-3 (SONET).

[edit] Frame Structure

Image:SDH STM1 Frame.JPG


<-------------------- 270 columns total size -------------------->
<- 9 col's ->
<------------------ 261 columns ------------------>
Regenerator
Section
Overhead
(RSOH)
AU Pointer
Multiplexer
Section
Overhead
(MSOH)
Frame payload
< ------------- 125 microseconds total duration ------------- >
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