| 摘要 |
A push button to rotary dial converter system for converting push button telephones to provide rotary dial type pulsed outputs. The system provided is universal and can be used with almost any subscriber set that is made to provide push button signals to the telephone system and is especially useful when the telephone system involved is not equipped to receive variable frequency dialing signals. Responsive to the operation of the selected push buttons, pulses are transmitted through the line. The system is unique, among other ways, in that the connection to the network is electronically opened during out pulsing and a parallel power supply arrangement is employed; and it is applicable even when only one pair of hook switche contacts are available, and one side of the pair of hook switch contacts are tied together. The system further includes a bridge circuit for maintaining the polarity on the subscriber set independent of telephone line polarity reversals, a portion of the bridge circuit also being used to prevent operation of the subscriber set ringer in response to the rotary dial type pulses.
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