| 摘要 |
PURPOSE:To send destination information and additional information by allowing an exchange to discriminate the destination information and additional information through hooking by implementing hooking so as to indicate a delimiter of each information and an end of all information thereby entering a hooking signal. CONSTITUTION:In an exchange 1 accommodating a dial pulse type telephone set 2, when additional information is entered in succession to destination information entered by a telephone set 2 at dialing, hooking is implemented to indicate a delimiter of each information and the end of all information to input a hooking signal to allow the exchange 1 to add the additional information to the destination information and to send the resulting information. The hooking signal uses a maximum of a DC loop interruption time allowed as a brake time of a dial pulse for a lower limit threshold level and uses a minimum of the DC loop interruption time allowed as an on-hook for an upper limit threshold level, and the signal whose DC loop circuit interruption time by hooking is in existence between two threshold levels of upper and lower limits is used for the hooking signal. |
