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Multiplexing E1/T1 to STM-1
In the process of SDH multiplexing recommended in G.709, there is more than one multiplexing path from a valid payload to STM-N.
Figure 16-4 and Figure 16-5 show the multiplexing from E1/T1 to STM-1.
In actual application, different countries and regions may adopt different multiplexing paths. To ensure mutual communication, the device provides the multiplex mode command on the CPOS interface so that you can select the AU-3 or AU-4 multiplexing path.