| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the deterioration of workability for feeding an easily portable terminal base station (CS) and also to feed the CS without bringing about voltage fluctuation and voltage drop by providing a feeding means which superimposes on a signal line between a terminal side and itself and feeds the terminal side. SOLUTION: The power of this network terminating device DSU: 1 is converted into a DC voltage from external AC power by external power supply for a DSU (AC adapter) and inputted to the DSU: 1. This external power is first converted into power needed by a network terminating circuit 11, a control circuit 12 and a terminal side terminating circuit 13 which constitute the DSU: 1 by an internal power circuit 14 and is supplied. At the same time, it is possible to supply power needed by a CS through a signal line by converting the external power into high voltage needed by the CS to be supplied to a feeding circuit 15 and superimposing it on a signal on a terminal side from the feeding circuit 15. |
