1.Strowger switching system  is easy to make calls regardless of the demand on the machine or the time of day.

2.It is possible to release calls more rapidly.

3.In automatic switching system, human operator doesn’t exist actually.

4.The two method for the mechanism to transmit the identity :

    a) Pulse Dialing

    b) Multi frequency  Dialing

5..  G = Governo

     GW= Gear Wheel

     IC = Impulsing Cam

     ICO = Impulsing Contact

     MS = Main Shaft

     P = Pawl

     PW = Pinion Wheel 

     R = Rachet