1.Automatic switching system can be divided into two parts. They are :

1.Electromechanical and 

2.Electronic.

2. In electronic switching system, we use control function and logic.That's why information are stored. Then that stored information are provided & information can be send.It's called Stored Program Control(SPC)

3: time division digital switch can be designed by using a combination of space and time switching techniques

4.In space Division switching system, dedicated and exclusive switching path should be established.

5.

Electromechanical switching system can be divided into two parts:

1.Steb - by - step  and 

2.Crossbar