| 摘要 |
PURPOSE:To decrease the total installation distance number between a center and a subscriber and the number of installation of reception sections by sending the same signal from the center to plural subscribers and sending a transmission signal of each subscriber from the subscriber tot he center in terms of a burst signal. CONSTITUTION:A distribution signal is sent to plural subscribers 21-2n via an optical fiber 5 from the center 1 and sent to each subscriber via an optical demultiplexing means 3 disposed on a point where subscribers are concentrated. Moreover, an incoming signal by the burst signal is sent to a 2nd optical fiber 6 via an optical multiplexing means 4 disposed on a point where subscribers are concentrated based on a subscriber relevant control signal received by the subscribers 21-2n and the signal is sent to the center 1. Even when the signal is sent from plural subscribers, the incoming signals are sent to the center 1 without occurring collision. Then the cost of the optical fiber installation and the number of transmission/reception sections between the center 1 and the subscribers 21-2n are reduced. |
