| 摘要 |
PURPOSE:To execute smoothly a call between each subscriber, in case a two- wire circuit is made to branch and a tripartite call is executed, by constituting a titled repeater by combining and connecting three hydrid coils and three bi- directional repeaters so that the gains among three two-wire terminals become ''0''dB, ''0''dB, and the gain for compensating a loss of the third two-wire circuit, respectively. CONSTITUTION:The first and the second bi-directional repeaters AMP1, AMP2 become the gains for compensating a loss of two hybrid coils, respectively, and the third bi-directional repeater AMP3 becomes the gain for compensating a loss of two hybrid coils and a transmission loss L of the third two-wire circuit. That is to say, the gain between terminals (a), (b), the gain between terminals (a), (b) become ''0''dB, and the gain between terminals (b), (c) becomes 1dB. Accordingly, when this repeater of L=10dB is installed in a subscriber exchange D, and the terminal (a), the terminal (b) and the terminal (c) are connected to a subscriber A, the second two-wire circuit (toll circuit) G, and the third two-wire circuit (toll circuit) H, respectively, a tripartite call can be executed by the same transmission loss among the subscribers A, B and C. |
