| 摘要 |
PURPOSE:To prevent an outgoing transmission signal from a station equipment to a terminal equipment from being intercepted by other terminal equipment by allowing the station equipment to identify the terminal equipment based on a terminal equipment identification ID number allocated fixedly to the user of the terminal equipment. CONSTITUTION:The system is provided with IC cards 51-5n storing a terminal equipment identification ID number allocated fixedly to the user of the terminal equipment, terminal equipments 11-1n reading the ID number from the IC cards 51-5n and sending the number to a station equipment 2, the station equipment 2 identifying the terminal equipments 11-1n based on the received ID number and a branch circuit 3 connecting the terminal equipments 11-1n and the station equipment 2. The terminal equipments 11-1n read the identification ID number allocated fixedly to the user of the terminal equipment stored in the IC cards 51-5n, sends the number to the station equipment 2, and the station equipment 2 identifies the terminal equipment based on the received ID number. Thus, it is not required to designate a time slot position in advance to the terminal equipments 11-1n and a transmission terminal equipment of data on a time slot is specified and the validity is confirmed. |
