| 摘要 |
PURPOSE:To suppress the increase of a cost comparatively for changing at the time of changing a base station for an analog-type mobile telephone into the bas station for a digital-type mobile telephone. CONSTITUTION:A digital mobile telephone systematization converter 4 is connected between a mobile telephone exchange 1 for the analog-type mobile telephone and the base station 3 for the digital-type mobile telephone. The digital- type mobile telephone systematization converter 4 format-converts a signal 5' supplied from the mobile telephone exchange 1 for the analog-type mobile telephone into the signal 6 applying to the base station 3 for the digital-type mobile telephone and also format-converts the signal supplied from the base station 3 for the digital-type mobile telephone into the signal 5' applying to the mobile telephone exchange 5 for the analog-type mobile telephone. The signal formats of the signal 5' and the signal 5 transmitted from the mobile telephone exchange 1 for the analog-type mobile telephone to the base station 2 for the analog-type mobile telephone are same. |
