| 摘要 |
PURPOSE:To suppress increase in system cost even in the case of a long distance by constituting the title system so as to share an auxiliary fiber from the center till a terminal box by plural subscribers. CONSTITUTION:A common auxiliary fiber 100 is connected to an exclusive auxiliary fiber 101 by connectors 102, 103. Thus, the common fiber is used for an expansion test of other subscriber when the common fiber is not required after the line test of system expansion is finished. Furthermore, the common auxiliary fiber 100 is connected to other common auxiliary fiber 105 by connectors 102, 102' and used for the line test of the system expansion in the next terminal box 5. The common fiber is also connected to other common auxiliary fiber by connectors 102'', 102''' and used for the line test of system expansion in the succeeding terminal box. |
