The device for switching line of symmetry idol cable system has reduced number of crosspoint switch for controlling

摘要

Line (18) between a kind of cable management system route communication society service circuit (16) and user is provided. Each service line (16) enters the system, and in a service terminal element circuit card (22), these have held the crosspoint switch matrix (228) of a part again. (18) enter the system, each user's line is in a deconcentrator circuit card (20). The service terminal element circuit card (22) is incorporated on the connector of the first side of middle line panel, middle line panel (24) on the connector of plate (24) and deconcentrator circuit card (20) other side. Pin extends through the opposite side middle line panel (24) of the interconnecting connector on middle line panel (24), so that any service line (16) may be coupled to any subscribers' line (18). A kind of system controller card (26) is mounted on middle line panel (24) that middle line panel (24) pass through bus and circuit card. When the route (16,18) of the service circuit and user, by baalnced pair (218,224,222,226), in order to reduce crosspoint switch (238) crosspoint switch matrix (228), balance between revenue and expenditure differential signal line to (218, (160 are converted to (161 on single-ended signal subscribers' line. Line segment (240) switches the matrix (228) and rear single-ended signal become again again differential signal generally speaking line to (222,224).