![]() Hence replacing the inconvenience of using the rotary dial, the touch-tone dial telephone was introduced. End-to-End signaling is a desirable feature and is possible only if the signaling is in voice frequency band so that the signaling information can be transmitted to any point in the telephone network to which voice can be transmitted. The Pulse dialing is limited to signaling between the exchange and the subscriber, but not between two subscribers, which is called End-to-End signalling. This has also removed the disadvantages of limited usage and limited signaling capacity along with lower speed. Hence, a new system called the Touch-tone dialing was developed in Telephony to replace the Rotary dial this was considered to benefit the customer with higher speed. ![]() With the introduction of the Common Control subsystems into switching exchanges, there came the feasibility for higher rates of dialing. In the Pulse dialing technique which is also called a Loop disconnect technique, repeated connecting and disconnecting of the lines is done, like clicks of a switch this is interpreted by the exchange as the number dialed, according to the number of clicks. ![]() It uses the DTMF technology, prior to which the pulse dialing technique was used. The step-by-step switching elements of the Strowger switching system, cannot respond to rates higher than 10-12 pulses per second. It took 12 seconds to dial a 7-digit number on a Rotary dial. Slower dialing was one major disadvantage associated with the Rotary dial. When we talk about the technological development of the telephone set, the rotary dial was used in the initial stages. In this chapter, we will learn about the Touch-tone Dial Telephone technology.
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