| 摘要 |
PURPOSE:To achieve automatic switching, by making a selective callout code of international system and domestic system different from each other. CONSTITUTION:Connecting state of the 1st-5th switches SW1-SW5 with each switching terminal is preset depending if a device is a calling station or a station or a station to be called, international or domestic system, and line connection or after line connection. For example, in case of the mode A of the international system, the selector switches SW1,SW3-SW5 are selected to contact (a) and the SW2 is selected to contact (b) at the calling station, and transmission is made from an ARQ selection callout signal generating circuit 4 of the station itself to a station to be called via an ARQ coding circuit 8, 3 to 4 constant mark coder circuit 10, and transmission signal output terminal 13. At the station to be called, when the said transmission signal is received at a transmission signal reception terminal 14 of the station itself, it is detected at an international system ARQ selection callout signal detecting circuit 15 and the specified control signal is transmitted to the calling station. When the calling station detects this control signal, the line connection is completed. |
