| 摘要 |
PURPOSE:To simplify control over busy display of an extension subscriber's telephone set to an office B board, by controlling the display of busy information of a circuit by only a signal control processor in which its office B board is installed. CONSTITUTION:Busy information of an extension subscriber's telephone set is read from and written in busy display common control circuit 201 by read-write information control line 207 via address bus 202 and data bus 204 by converting an extension subscriber's telephone number into address information. Next, the busy information written in circuit 201 is set in busy display information memory 208, provided corresponding to each signal control processor, via address bus 203 and data bus 205. Consequently, the needed busy information of the extension subscriber's telephone set can be obtained via data bus 206 by an office B board equipped in the signal control processor. |
