Power feeding system for telephone terminal in LAN
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Accused Products
Abstract
Terminals are connected via cables in a star-shaped fashion with respect to a HUB in a LAN. Each of the cables includes therein signal lines and power feed lines. The HUB includes therein a power feed section. The power feed section and the power feed lines of each cable are connected to measure a value of current which flows in the power feed lines. If it is judged based on the measured current value that the terminal connected to the corresponding cable is a telephone terminal, the power feeding to the corresponding power feed lines is continued. On the other hand, if the terminal is judged to be a terminal other than the telephone terminal, the power feeding is stopped.
12 Citations
25 Claims
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1-6. -6. (canceled)
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7. An improved LAN having terminals connected to a line concentrator via signal lines for carrying signals between the terminals, wherein the improvement comprises:
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power feed lines connected to the terminals; and
a power feeding system that includes a power feed section for selectively feeding power to the power feed lines, a current monitor section for detecting whether current is flowing to each terminal and, if so, whether the current has a value within a preset current range which indicates that the respective terminal receiving the current is a telephone terminal, and a control section for controlling the power feed section to stop feeding power to particular terminals if the current monitor section detects that current flowing to those terminals has a value that is outside the preset current value range, and to continue feeding current to particular terminals if the current monitor section detects that current flowing to those terminals has a value within the preset current range. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A power feeding system for use with a LAN having a line concentrator that is connected to terminals by cables, the cables including signal lines for carrying signals between the terminals, said power feeding system comprising:
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power feed lines in the cables in addition to the signal lines; and
a power feeding system that includes a power feed section for selectively feeding power to the power feed lines, a monitor section for detecting whether power is being supplied to each terminal and, if so, whether the power has a value within a preset range which indicates that the respective terminal receiving the power is a telephone terminal, and a control section for controlling the power feed section to stop feeding power to particular terminals if the monitor section detects that power which is being supplied to those terminals has a value that is outside the preset range, and to continue feeding power to particular terminals if the monitor section detects that power which is being supplied to those terminals has a value within the preset range. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A power feeding system for use with a LAN having a line concentrator that is connected to terminals by cables, the cables including signal lines for carrying signals between the terminals, said power feeding system comprising:
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power feed lines in the cables in addition to the signal lines; and
a power feeding system that includes a power feed section for selectively feeding power to the power feed lines;
a monitor section for detecting whether power is being supplied to each terminal and, if so, whether the power has a value within a preset range which indicates that the respective terminal receiving the power is a telephone terminal, and a control section for controlling the power feed section to apply a voltage to the terminals, to stop applying voltage to particular terminals if the monitor section detects that power which is being supplied to those terminals has a value that is outside the preset range, and to continue applying voltage to particular terminals if the monitor section detects that power which is being supplied to those terminals has a value within the preset range. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification