| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce costs and to prevent the same error from occurring double by coupling each connection line between two nodes and a connection line, which is provided while being overlapped with these connection lines, through a combiner-splitter element. SOLUTION: Logically equal nodes SN1'-SN3' are auxiliarily made correspondent to respective nodes SN1-SN3. Further, auxiliary connection lines L1'-L3' are let belong to respective node connection lines L1-L3. Besides, the auxiliary node connection lines respectively forming one line couple are mutually coupled through one combiner-splitter element C/S at least. Further, the auxiliary subscriber connection lines respective forming one line couple are mutually coupled through one element C/S at least. Thus, an interface is simultaneously formed corresponding to an individual subscriber line coupled with one subscriber device.</p> |
