| 摘要 |
PURPOSE:To attain privacy signal processing at talking by preparing a scramble section and a descramble section in a slave station and adding a key code data specifying a scramble pattern into a control signal sent from a master station to a slave station at the connection of a satellite line. CONSTITUTION:When a call request is caused from a subscriber terminal equipment 21A or an exchange connecting to a slave station 2 to a subscriber terminal equipment 21B or the exchange connecting to a slave station 3, a call and connection destination information sent from a control section 8A are sent to a master station 1 in the random access system with a slot at a CSC channel frequency and demodulated by a demodulator 20. The master station 1 inserts scramble key codes 21,22 specifying a scramble pattern and sends the result to slave stations 2,3. The slave stations 2,3 use respectively internal control sections 8A, 8B to transit a channel frequency to a traffic frequency and the control sections 8A, 8B send a received key code to descramble sections 9A, 9B and scramble sections 10A, 10B to specify the scramble pattern. |
