Tele-Communication (Telecom) Terms Glossary and Dictionary
Class of Service Tone
Class of Service Tone is the Class of Service signal that is used at a toll board operating as an 'A" board to identify the class or service of the calling customer. The indication may be high, low, or no tone. Class of Service is a single burst of either High Tone or Low Tone for 0.05 to 1 seconds.