- interdigit interval
- When pulse dialing is used, you need a certain amount of time free of "clicks" so the phone company knows that the digit is finished. When you are dialing on a rotary phone, you don't need to worry about this because the time it takes to turn the dial is sufficient. A modem that sends pulse codes must wait a specified amount of time before going from one digit to the next in a phone number. A value between 1/2 second a 1 second is usually used.
Dictionary of telecommunications. Д.С.Иносов. 2000.
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Pulse dialing — Middle 20th century rotary dial telephone Pulse dialing, dial pulse, or loop disconnect dialing, also called rotary or decadic dialling in the United Kingdom (because up to 10 pulses are sent), is pulsing in which a direct current pulse train is… … Wikipedia