The British (GPO, later Post Office Telecommunications) standard for Strowger switch exchanges has been 10 impulses per second (allowable range 7 to 12) and a 66% break ratio (allowable range 63% to 72%) In most switching systems one pulse is used for the digit 1, two pulses for 2, and so on, with ten pulses for the digit 0; this makes the code unary, excepting the digit 0.
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