| 摘要 |
PURPOSE:To prevent malfunction due to dissidence of attribute, through the comparison between the attribute in a signaling frame addressed to an opposing station and that of a incoming terminal, by transmitting the frame superimposed on the attribute data of a calling terminal at the request of line connection in storing the attribute of the terminal to a storage circuit. CONSTITUTION:Through the use of a signaling frame (SG), the attribute of a terminal station device connecting various terminals is stored in an attribute data storage circuit 72, the attribute of a call from a terminal connecting circuit 73-1 and that of a calling terminal from the circuit 72 are superimposed at a control circuit 74 to form the addressed SG. This SG is transmitted to a transmission line 60-1 via a frame multiplexing circuit 64 and the like. A terminal device receiving the call establishes the frame synchronism at a frame synchronizing circuit 66, and a terminal address comparison circuit 67 compares the attribute data of an incoming terminal and said data in the SG. When they are dissident, the SG representing that the connection of line is unconditionally impossible is returned to a calling terminal station device, allowing to prevent malfunction due to the dissidence of the attribute. |
