| 摘要 |
PURPOSE:To calculate talkable time corresponding to remaining meney and to indicate successively by calculating basic time for each call area. CONSTITUTION:When a channel is set, DT returns from office equipment side 9. A subscriber makes specified dialing after hearting DT. Then, a basic time discriminating circuit 5 discriminates basic time of corresponding specified data column of a data section 2a of a controlling circuit network 2 (8-bit microprocessor) and takes out. Then, calculation of ''talkable time (s) = remaining number of times X basic time (s)'' is made in a talkable time calculating circuit 6, and remaining talkable time is calculated. This time is displayed immediately by a talkable time display circuit 7. Then connection to called person is made, and a subscriber 14 can make talking. During talking, subtraction process of remaining number of times is performed successively by metering pulse. Accordingly, subtraction of talkable time is made simultaneously corresponding to the above process and displayed similarly. At the same time, the balance is displayed subtractively by a balance display circuit 3 of the card. |
