Traffic Considerations with TONE-DIAL® Telephones
H. Ebel, R. Mina · IRE Transactions on Communications Systems · 1968
This paper compared two methods of operation of receivers for pushbutton calling using voice frequency signaling. It compares the traditional system in which the tone receiver is connected for the full dialing interval with a system in which the receiver is connected only during the instant of tone generation when a pushbutton is operated. Not surprisingly, the results indicate that a smaller number of receivers is required in the latter case. Representations are made that the more complex station and central office detection equipment required in the latter case is less expensive than the additional receivers needed for the former with an acceptable grade of service.