Lower-orderSDH → Higher-order SDH: Byte interleaved synchronous multiplexing
PDHsignal → STM-N: Synchronous multiplexing and flexible mapping
140M → STM-N
34M → STM-N
2M → STM-N
Multiplexing proceeds according to a specific multiplexing route selected by a country orregion from several routes specified by ITU-T.
BasicMultiplexing and Mapping Structure of SDH:

2M multiplexing procedure:

34M multiplexing procedure:

140M multiplexing procedure:


