40Gbit/s and 100Gbits coherent systems do not require dispersion compensation because the dispersion tolerance of coherent boards is very large. NG WDM does not support mixed transmission of incoherent networks and coherent networks.

The rate of STM-0 is 51.84Mbit/s; (STM-0 is used for digital microwave).

Some SNCP protection inversion conditions are default, such as AU-AIS and TU-AIS. Other conditions are optional, such as HP-TIM and HP-SLM. Optional conditions can be flexibly set according to the level of the costume.

RSOH, MSOH, HPOH and LPOH implement monitoring functions in descending order of monitoring range.

The scope of management of OMSn is the path from the input optical port on the multiplexer unit of the sending site to the output optical port on the multiplexer unit of the receiving site, called the optical multiplexing segment (OMS) path.