| 摘要 |
PURPOSE:To decrease the quantity of data transfer between a subsystem and a host exchange and to improve the system reliability by storing the present station change non-object data into a ROM of the subsystem together with the present station change object data stored into the host exchange respectively. CONSTITUTION:The packet exchange data includes the present station change non-object data which is used at the working of the subsystems 140 and 150 and has its contents which are not changed during operation and the present station change object data having its contents to be changed during operation. This packet exchange data is produced from a 1st data that requires previously the back-up data for necessity of the initial value and a 2nd data requiring no back-up data. Then the present station change non-object data of the back-up data for the 1st data are stored in the ROM 230 of both subsystems 140 and 150 respectively. At the same time, the present station change non-object data is also stored in a host exchange 100 in the form of a group of station data production instruction sentences regardless of the main storage address of the subsystem. Thus the reliability of a packet exchange data control system can be improved. |
