| 摘要 |
PURPOSE:To enhance the calling process capacity when the dial pulse is sent to the remote station, by sending the trigger signals to the driving unit by the number equivalent to the number of figure pulses to be sent and then producing the pulse time by the driving unit. CONSTITUTION:Signal distribution unit SD consists of monostable multivibrator M which generates the pulse of 64ms determined by negative edge trigger n of NAND gate N of input signal A and gate signal G through CR and based on the set order given from the central control unit and transistor T2 which operates the P relay of outgoing sender trunk OST when output Q of vibrator M features the H level. The dial pulse sending system consists of such unit SD. Thus in case the dial pulse is sent to the remote station, the reset order to unit SD is omitted just by sending the set order (trigger signal) to unit SD from the central control unit by the number equivalent to the number of the figure pulses to be sent. As a result, the ordering frequency can be decreased for the central control unit. |
