SDN Prerequisites Knowledge: About the South interface and North interface Lao Li's understanding

The first kind, in the English meaning
1. The North interface is the top level abstraction interface of a module;

2. The South interface is the interface of the internal sub-module of a module;
The second, according to my understanding, the North interface is equivalent to the interface between Rosng and FTM, the south is equivalent to the interface between the FTM and the chip
The third, according to my understanding between the application layer and the data management layer is the north, the data management and data forwarding processing is the south
The fourth kind according to my understanding, South does not have the Amitabha Buddha, the south is called solitary, therefore the South is manages others, the Southern Song scholar often faces the north to worship, therefore North contains the human soul,, does not have the north direction, the South is a zombie

SDN Prerequisites Knowledge: About the South interface and North interface Lao Li's understanding