| 摘要 |
PURPOSE: To send a PB dial signal as a control signal to a DP dial line while satisfying a prescribed limit for the average level of a low frequency component when a master set receives dial data containing a tone switching signal from a slave set. CONSTITUTION: Assuming that a control part 4 judges a line 3 as a DP dial line A and a master set 1 receives the tone switching signal contained in abbreviated dial data S from a slave set 2, in this case, each time the data S after the second data are first received later, the master set 1 inhibits the transmission of a PB dial signal PB based on the data S and transmits a busy signal to the slave set 2. When the data S after the second data are received again, the master set 1 sends the signal PB based on the data S to the line 3. When the slave 2 receives the busy signal from the master set 1, after the lapse of prescribed time to provide minimum pause for satisfying the limit of the average level, the dial data after the second data are sent to the master set 1 again. Thus, the signal PB can be processed and sent to the line A. |
