| 摘要 |
A routing system for a linear add-drop multiplexer (ADM) having two drop switches, operates to establish paths according to a relatively simple process and to establish paths according to a program that is relatively small in scale and in-expensive to develop. The routing system includes a first selection switch for selecting one of several channels connected to a first transmission line and for outputting a signal transmitted through the selected channel. A first selector selectively outputs and inhibits the signal transmitted from the first selection switch. The first selection switch and the first selector are provided in one of the drop switches. A second selection switch selects one of several channels connected to a second transmission line and outputs a signal transmitted through the selected channel. A second selector inhibits the signal transmitted from the second selection switch when the first selector outputs the signal, and outputs the signal when the first selector inhibits the signal. The second selection switch and the second selector are provided in the other of the drop switches. The signals are transmitted from the first and second selectors to a transmitter/receiver for lower signal levels. The routing system of the invention operates to establish paths in a relatively simple, inexpensive manner.
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