Power feeding system for telephone terminal in LAN
First Claim
1. An improved LAN having terminals connected to a line concentrator via signal lines for carrying signals between the terminals and the line concentrator, wherein the improvement comprises:
- power feed lines connected to the terminals; and
a power feeding system that includesa 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,a control section for controlling the power feed section to stop feeding power to particular terminals if the current monitor section detects that each 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 each current flowing to those terminals has a value within the preset current range, anda line state monitor table for storing given states of the power feed lines and the signal lines,wherein the control section controls operation of the power feeding system based on the line state monitor table.
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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
19 Claims
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1. An improved LAN having terminals connected to a line concentrator via signal lines for carrying signals between the terminals and the line concentrator, 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, a control section for controlling the power feed section to stop feeding power to particular terminals if the current monitor section detects that each 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 each current flowing to those terminals has a value within the preset current range, and a line state monitor table for storing given states of the power feed lines and the signal lines, wherein the control section controls operation of the power feeding system based on the line state monitor table. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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 and the line concentrator, 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 unit 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, a control section for controlling the power feed section to stop feeding power to particular terminals if the monitor section detects that each 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 each power which is being supplied to those terminals has a value within the preset range, and a line state monitor table for storing given states of the power feed lines and the signal lines, wherein the control section controls operation of the power feeding unit based on the line state monitor table. - View Dependent Claims (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 and the line concentrator, 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 unit 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, 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 each 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 each power which is being supplied to those terminals has a value within the preset range, and a line state monitor table for storing given states of the power feed lines and the signal lines, wherein the control section controls operation of the power feeding system based on the line state monitor table. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification