| 摘要 |
PURPOSE:To ensure an even efficiency of use for the subscribers within the same representation group thus to increase the function of operation and furthermore increase the lifetime, by providing a count storing circuit to be connected to the common control circuit of a switchboard. CONSTITUTION:The circuit 8 that counts and stores the incoming frequencies to the extension representation group number is connected to the common control circuit 6. For the circuit 8, a addition is carried out with every selection of representation and continued until the selecting frequency (m) becomes equal to the size (n) of the group, and a zero-reset is carried out when m=n is satisfied. In case the selecting frequency m=1 is secured for the circuit 8, the called subscriber of the 1st selection order is the extension subscriber 42. After this the selection is carried out i the order of 42... 4n 41. In this case, an addition value of (m+1) is stored in m4 of the circuit 8 so as to be used as a numerical value for the next selection. As a result, the next selection of representation is carried out at the next- rank extension subscriber. |
