| 摘要 |
PURPOSE:To improve the use efficiency of a satellite line by permitting a center station to open-control satellite earth stations during communication. CONSTITUTION:When a compulsory communication cut signal is inputted from the input part 13 of the center station 1 while the satellite earth stations 2-1 and 2-2 make a call, a DAMA main control part 12 transmits a compulsory communication cut control signal to the satellite earth stations 2-1 and 2-2 through a control line 41. When the control recpetion circuits 21-2 and 22-2 of the satellite earth stations 2-1 and 2-2 recieve the compulsory communication cut signal from the control line 41 through radio machines 21-1 and 22-1. they transmit it to DAMA subordinate control parts 21-3 and 22-3 and the DAMA subordinate control parts 21-3 and 22-3 control the opening of a call line 42 which is used at present. |
