What does per pulse means?

Question

What does per pulse means?

Answer 1

The predecessor to the touch tone dial was the rotary dial. The rotary dial operated by winding a spring and when let go it would generate electronic pulses for each digit dialled. For example a digit 9 would pulse out nine times. The digit 6 would pulse out six times.

The equipment was designed to work at 10 pulses per second (pps) so if you dialled the digit 0 (ten pulses) it would take one second.