| 摘要 |
PURPOSE:To reduce the scale of the scanning circuit for the frequency pulse by giving the direct scanning to the channel control line of the outgoing trunk and the like. CONSTITUTION:Controller CONT converts the storage position information of outgoing trunk OGT through which the storage position information of calling subscriber SUB is connected to subscriber SUB into the electronic level from the electromagnetic level and then to send the electronic level to processor CP. Here, the correspondence is shown at the temporary memory part within CO between trunk OGT and subscriber SUB in order to read out the frequency pulse on the control line of OGG then to memorize temporarily the counted frequency data in correspondence to OGT. Thus, the contents of the frequency data is examined every fixed period and then transferred to main memory MEM to perform addition as well as to give the original setting to the frequency data. In other words, the scale of the scanning circuit of the frequency pulse can be reduced by giving the direct scanning SCN to the channel control line of trunk OGT and the like. |
