SS4 full form

Meaning : Signalling System 4 (2040/2400 Hz tones)

Category : Telecommunication
Sub Category :Bandwidth & Channels  
Type : Initialism

Signalling System 4 (2040/2400 Hz tones)

What is the full form of SS4 and meaning ?

This is a range of frequencies which is a channel associated signalling code which is in the 2040/2400 hertz supervisory tone.