| 摘要 |
The invention is directed to an ATM-System adapted three-step switching unit, including an input circuit including a number of incoming group related conductors connected to a first switching stage, an output circuit including a number of outgoing group related conductors connected to a second switching stage and a third switching stage. A control unit coacts with said switching stages in order to connect one of said incoming conductors with a selected outgoing conductor by way of a connecting path, pointed out through the third switching stage. Each of the outgoing conductors belonging to the first switching stage coacts with an electro-optical converter. The respective connections between the first switching stage and the third switching stage consist of an optical conductor. The third switching stage is adapted to transfer optical information-carrying signals through the connecting path. The connections between the third switching stage and the second switching stage consist of optical conductors and incoming conductors belonging to said second switching stage, which are pre-connected by an opto-electrical converter. |
