JPH11252148A - Feeding system to telephone terminal corresponding to lan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate preparation work for installing a telephone terminal by integrally constituting a signal line for transmitting a data signal transmitted/ received between terminal units and a feeding line feeding power to the telephone terminals connected to LAN to constitute a cable. SOLUTION: A power feeding control switch part 2 switches a status where a power feeding part 6 feeds power to a feeding line 3B to a status where the part 6 stops the feeding of power to the power feeding line 3B when a telephone terminal detection part 1 recognizes the existence of a telephone terminal 4. In a cable 3, a signal line 3A, the feeding line 3B and a ground line 3C which connect the telephone terminal detection part 1 and the telephone terminal 4, are integrated. The signal line 3A is a conductor for transmitting a data signal transmitted/received between the units constituting LAN and the feeding line 3B is a conductor for supplying DC power to the telephone terminal 4. Therefore, it is not necessary for the respective telephone terminals 4 to receive power supply from a commercial power source and preparation work for installing the telephone terminals 4 becomes easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a LAN (Local Ar
The present invention relates to a power supply system and a power supply method for an ea Network) compatible telephone terminal.

[0002]

2. Description of the Related Art In recent years, in the field of information processing, the use of computers of an appropriate scale and the transition to small machines have been rapidly progressing in accordance with the contents of business. In order to promote the light sizing and downsizing, the technology development of LAN for distributed processing or horizontal distributed processing using a plurality of workstations (hereinafter abbreviated as WS) and a plurality of personal computers (hereinafter abbreviated as PC). Is being promoted. Further, technical development of LAN-compatible telephones that can be adapted to this LAN environment is also proceeding at the same time. In such a case, the power supply system for the telephone terminal is an important solution.

[0003] That is, a data signal is flowing in a transmission line that constructs a LAN environment. Therefore, it is difficult to use this transmission path together with a power supply path to a telephone terminal like a public line. Particularly, an Ethernet LAN using a Manchester code with a suppressed DC component as a transmission code.
It is almost impossible in such cases. Here, the Manchester code is a code in which the polarity of a transmission bit is always inverted at the center of the bit, and the logical values 1, 0 are defined in the direction of the inversion. That is, the DC component is suppressed. Therefore, the telephone terminals individually receive power supply from a commercial power supply via an AC adapter.

[0004]

However, the above-mentioned conventional techniques have the following problems to be solved. 1. Since the telephone terminals are individually supplied with power from a commercial power supply via an AC adapter, preparation work for installing the telephone terminals is complicated. 2. Every time the installation position of the telephone terminal is changed, the operator needs to manually clarify the installation position with respect to the network, which lacks portability.

[0005]

The present invention adopts the following constitution in order to solve the above points. <Structure 1> In a LAN (local area network) in which terminal devices are radially connected via a cable centering on a current collector, the cable is used to transmit a data signal transmitted and received between the terminal devices. Signal lines,
A power supply system for a LAN-compatible telephone terminal, wherein a power supply line for supplying power to the telephone terminal connected to the LAN is integrally formed.

<Configuration 2> A signal line for transmitting data signals transmitted and received between the terminal devices in a LAN in which terminal devices are radially connected via a cable with a current collector as a center, and the LAN is connected to the LAN. A power supply unit for supplying power to the connected telephone terminal; a power supply unit for supplying power to the telephone terminal via the power supply line; a state in which the power supply unit supplies power to the power supply line; and stopping power supply to the power supply line A power supply control switching unit that performs switching between the power supply line and a current monitoring unit that monitors a current value flowing through the power supply line; in a state where power is supplied from the power supply unit to the power supply line, a current flowing through the power supply line is When the current monitoring unit detects that the current value deviates from the range of the specified current value that should flow when the telephone terminal is connected,
A power supply system for a LAN-compatible telephone terminal, wherein the power supply control switching unit switches from a state in which the power supply unit supplies power to the power supply line to a state in which power supply to the power supply line is stopped.

<Configuration 3> In the power supply system for a LAN-compatible telephone terminal according to Configuration 2, the signal line is monitored to confirm the establishment of a link between terminal devices connected to the signal line.
In a state in which a K detection unit is provided and power is supplied from the power supply unit to the power supply line, a current flowing through the power supply line is in a range of a specified current value to flow when a telephone terminal is connected, and the LNK A power supply system for a LAN-compatible telephone terminal, wherein the power supply control switching unit continues the state in which the power supply unit supplies power to the power supply line when the detection unit can confirm the link establishment.

<Configuration 4> In the power supply system for a LAN-compatible telephone terminal described in Configuration 2, the signal line is monitored to confirm the establishment of a link between terminal devices connected to the signal line.
A K detection unit is provided, and in a state where the power supply from the power supply unit to the power supply line is stopped, when the LNK detection unit can confirm the establishment of the link, the state in which the power supply to the power supply line is stopped is maintained. Power supply system for LAN-compatible telephone terminals.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. <Configuration of Specific Example> FIG. 1 is a block diagram of a power supply system according to a specific example. In a specific example, the present invention employs Ethernet L
This is an example adapted to AN · 10BASE-T (hereinafter referred to as 10BASE-T).

As shown in the figure, a power supply system according to a specific example includes a telephone terminal detection unit 1, a power supply control switching unit 2, a cable 3
, Telephone terminal 4, connector A, connector B, DC
A DC / DC converter 10 and a control unit 11. The telephone terminal detection unit 1 includes a current monitoring unit 5 and a power supply unit 6.
, A timer unit 7, an LNK detection unit 8, and an LNK detection state monitoring unit 9. The telephone terminal detection unit 1 is a component of the HUB, and is a unit that checks the locations of all the telephone terminals 4 connected to the HAB and supplies power. Here, the HUB is a line concentrator that converges a plurality of signal lines connected to a terminal device in a star shape.

When the telephone terminal detection unit 1 confirms the presence of the telephone terminal 4, the power supply control switching unit 2
This is a switch for switching from a state in which power is supplied to B to a state in which power supply to the power supply line 3B is stopped. The cable 3 connects the telephone terminal detection unit 1 and the telephone terminal 4, and is a cable in which a signal line 3A, a power supply line 3B, and a ground line 3C are integrated. The signal line 3A is a conductor for transmitting data signals transmitted and received between devices constituting the LAN, and the power supply line 3B is a conductor for the power supply unit 6 to supply DC power to the telephone terminal 4. In 10BASE-T, a UTP cable (commonly called an unshielded stranded wire pair) is used. The telephone terminal 4 is a LAN-compatible telephone.

The connector A is a connector for connecting the cable 3 to the telephone terminal detecting section 1. The connector B is a connector for connecting the cable 3 to the telephone terminal 4. 10BA
In the SE-T, an 8-pin connector RJ45 (commonly known as a modular jack) is used as the connector A and the connector B. The connection position of the 8-pin will be described later.

The DC / DC converter 10 includes a power supply line 3B
Is a part for converting a DC voltage sent from the telephone terminal detection unit 1 to a DC voltage required by the telephone terminal 4 and supplying power. The control unit 11 is a part that controls the entire power supply system and performs operation switching, state determination, and the like.

Next, the internal configuration of the telephone terminal detecting section 1 will be described. The current monitoring unit 5 is a unit that measures a current value flowing through the power supply line 3B when the telephone terminal detection unit 1 confirms the presence of the telephone terminal 4. The power supply unit 6 is a part that supplies power to the telephone terminal 4. When the telephone terminal detection unit 1 confirms the presence of the telephone terminal 4, the timer unit 7
This is a part for defining the time for applying the voltage.

When the telephone terminal detecting unit 1 confirms the presence of the telephone terminal 4, the LNK detecting unit 8 accepts a signal from the physical layer 20 on the network side and allows the telephone terminal 4 or other terminal equipment to connect to the LAN. This is a part for checking whether a link has been established. Here, link establishment means that the terminal device is in a standby state in which it can operate integrally with the LAN. LNK detection status monitor 9
When the telephone terminal detection unit 1 confirms the existence of the telephone terminal 4, the telephone terminal 4 or another terminal device continuously monitors after the link is established with the LAN.

Next, the connection positions of the eight pins of the connector A will be described. The RJ45 has eight pins NO1 to NO8. The NO1 and NO2 pins are connected to a transmission line on the network side, and the NO3 and NO6 pins are connected to a reception line on the network side. NO4, NO5, NO
7, any two of the NO8 pins (here, NO4 and N
O5 pin) is used for the power supply system, and the remaining two are released or grounded (here, NO7, NO
8 pin is grounded).

Similarly, the connection positions of the eight pins of the connector B will be described. The RJ45 is 8 from NO1 to NO8.
With a book pin. The pins NO1 and NO2 are connected to the transmission line on the terminal side, and the pins NO3 and NO6 are connected to the reception line on the terminal side. Of the NO4, NO5, NO7, and NO8 pins, two arbitrary pins (here, defined as NO4 and NO5 pins) are used for the power supply system, and the remaining two pins are grounded to the terminal device (here, the NO7 and NO8 pins). To the chassis). Further, the NO1 and NO2 pins of the connector A are connected to the NO3 and NO6 pins of the connector B and the NO and NO pins of the connector A.
3. Pins NO6 and NO1 and NO2 of connector B
The NO4, NO5, NO7, and NO8 pins of the connector A are connected to the NO4, NO5, NO7, and NO8 pins of the connector B, respectively.

<Operation of Specific Example> Next, the operation of the power supply system according to the specific example will be described. FIG. 2 is an explanatory diagram of the operation of the power supply system according to the specific example. Operation stage S-1
A description will be given according to S-9. S-1 (power ON). An operator turns on a switch of the power supply system. Usually, this switch coincides with the start switch of the LAN. The power supply system is activated, and the process proceeds to S-2 to start the operation of the LNK detecting unit 8 (FIG. 1).

S-2 (LNK detected? Monitoring time T1). L
The NK detector 8 (FIG. 1) monitors the network for a time T1 defined by the timer 7 (FIG. 1). LNK
When it is detected, it is determined that the terminal device connected to this HUB, such as WS or PC, has a link established, and S
Go to -3. Alternatively, when LNK cannot be detected, S-
Proceed to 4. Here, when LNK cannot be detected, the terminal device is a power-off state when the terminal device is a WS, a PC, or the like. When the terminal device is the telephone terminal 4, the terminal device waits for power supply. Can not). Or
It is also assumed that the terminal device is not connected. First, a case where LNK is detected will be described.

S-3 (LNK status monitoring continued?). LNK
The detection state monitoring unit 9 (FIG. 1) continues to monitor the LNK detection state instead of the LNK detection unit 8 (FIG. 1). This LNK
As long as the detection state continues, the network is in a normal operating state that continues to operate. If the state changes to a state in which LNK cannot be detected, the process returns to S-2 and starts again from LNK detection. Next, a case where LNK cannot be detected in S-2 will be described. At this time, the process proceeds to S-4 in order to execute the investigation of the terminal device connected to the HUB.

S-4 (connection terminal investigation). L in S-2 above
When the NK cannot be detected, the connected terminal is checked through the operation steps described below. First, the control unit 11 (FIG. 1)
Switches the power supply control switching unit 2 (FIG. 1) to connect the connector A
DC voltage is applied to the NO4 and NO5 pins of FIG.
Proceed to -5. S-5 (current value within specified range?) The current monitoring unit 5 (FIG. 1) measures a current value flowing through the NO4 and NO5 pins of the connector A (FIG. 1), and the current value is within a specified current value range. Check if it is inside. The range of the specified current value is an appropriate range centered on an appropriate current value when the telephone terminal is connected.
The upper and lower limits of this range are determined by the type of telephone terminal connected. This range may be selected empirically.

Accordingly, NO4 and NO4 of the connector A (FIG. 1)
If the current value flowing through pin 5 is within the range of the specified current value, there is a high probability that the connected terminal device is telephone terminal 4 (FIG. 1). At that time, the process proceeds to S-6. Further, when the current value flowing through the NO4 and NO5 pins of the connector A is out of the range of the specified current value, there is a high probability that the connected terminal device is a terminal device other than the telephone terminal 4 (FIG. 1). This is because when the connected terminal device is a terminal device other than the telephone terminal 4 (FIG. 1), this connector A (FIG. 1)
NO4 and NO5 pins are grounded or open. That is, the value of the current flowing when the housing is grounded is larger than the specified current value. However, the flow is restricted so as not to flow above the upper limit from the viewpoint of safety. Also, almost no current flows during the open state.
In such a case, the process proceeds to S-8. First, the case where the current is within the range of the specified current value will be described.

S-6 (LNK detected? Monitoring time T2). S
In addition to the monitoring time T1 at -2, as a result of waiting for a further T2 time, if LNK is detected, the process proceeds to S-3, where LN is detected.
The K detection state monitoring unit 9 (FIG. 1) is changed to the LNK detection unit 8 (FIG. 1).
Instead, the monitoring of the LNK detection state is continued. This state is a case where the terminal device is the telephone terminal 4 (FIG. 1). As long as the LNK detection state continues, the network is in a normal operation state in which the network continues to operate. In such a case, the telephone terminal 4
In FIG. 1, the current continues to flow within the range of the specified current value.
If LNK detection has not been continued, the process returns to S-2 and starts again from LNK detection.

In addition to the monitoring time T1 in S-2, if LNK is not detected after waiting for a further time T2, another terminal device other than the telephone terminal 4 (FIG. 1) is connected. High probability. In this case, voltage application to the NO4 and NO5 pins of the connector A (FIG. 1) is temporarily stopped. Thereafter, the process returns to S-4, and again, S-5, S-6, S-7, S
The loop of -4 is repeated. If the terminal equipment connected during the repetition of this loop is the telephone terminal 4 (FIG. 1)
Waits for LNK detection. If the terminal is other than the telephone terminal 4 (FIG. 1), the process waits for a branch from S-5 to S-8. That is, it waits until the power of the terminal devices other than the telephone terminal 4 (FIG. 1) is turned on.

Alternatively, during that time, the telephone terminal 4 (FIG. 1)
And terminal devices other than the telephone terminal 4 (FIG. 1) are connected,
Wait for the loop iteration to stop. However, during this loop repetition, NO4 and NO4 of the connector A (FIG. 1)
Since the value of the current flowing through pin 5 is a specified current value, even if the loop is repeated for a long time, no particular adverse effect occurs. Next, the case where the current value is out of the range of the specified current value in S-5 and the process proceeds to S-8 will be described.

S-8 (stop voltage application). As described in S-5, there is a high probability that a terminal device other than the telephone terminal 4 (FIG. 1) is connected. In such a case, once the connector A
The voltage application to the NO4 and NO5 pins in FIG. 1 is stopped, and the process proceeds to S-9. S-9 (LNK detected? Monitoring time T3). When LNK is detected as a result of waiting for a further T3 time in addition to the monitoring time T1 in S-2, the process proceeds to S-3, and the LNK detection state monitoring unit 9 (FIG. 1) changes the LNK detection unit 8 (FIG. 1). Instead of 1),
Continue monitoring the LNK detection status. As long as the LNK detection state continues, the network is in a normal operation state in which the network continues to operate. This state is a case where terminal devices other than the telephone terminal 4 (FIG. 1) are connected. In such a case, S-8
, The voltage application is stopped, so that no current flows through the power supply line.

If LNK is not detected, S-
4, the loop of S-5, S-8, S-9, and S-4 is repeated again. While repeating this loop, the connected terminal equipment waits for LNK detection. In the meantime, it waits until the above-mentioned loop repetition stops due to the connection of the telephone terminal 4 (FIG. 1) and terminal equipment other than the telephone terminal 4 (FIG. 1). However, the current value flowing through the NO4 and NO5 pins of the connector A during this loop repetition is
Above the upper limit from the aspect of safety, it is restricted so as not to flow. Therefore, even if the loop is repeated for a long time, no particular adverse effect occurs.

As described above, in the specific example, the Ethernet LAN
Although the description is limited to 10BASE-T, the present invention is not limited to the Ethernet LAN 10BASE-T. A star type LA in which terminal devices are connected in a star by a hub or an alternative concentrator.
If N, then everything is compatible.

FIG. 3 is a block diagram showing a configuration example of a LAN using the present invention. The LAN shown in FIG.
0B using a link cable 31. Telephone terminals 4A to 4C and other terminal devices 32A to 32E such as personal computers are connected to the respective concentrators 30A and 30B in a star shape by a cable 3 including a signal line and a power supply line.

Further, inside each of the concentrators 30A and 30B, the power supply control switching unit 2 and the LNK detecting unit 8 described above are provided.
Are provided. With this configuration, the concentrator 30A
By the control described above, the telephone terminals 4A and 4B are recognized, and the power is supplied to the cable 3 connecting them. No power is supplied to the other terminal devices 32A to 32B. Similarly, the line concentrator 30B recognizes the telephone terminal 4C and supplies power to the cable 3 connected thereto. Other terminal devices 32C-
32E is not powered.

In the star type LAN, the concentrator can individually check the link establishment state and the supply current of each terminal device connected thereto, so that the power supply is automatically started individually when the telephone terminal is connected. it can. As shown in the example of the figure, L using a plurality of line concentrators that are commonly used.
In an AN, each concentrator may perform the control of the present invention.

[0032]

By providing a power supply system for a LAN-compatible telephone according to the present invention in a star type LAN concentrator,
The following effects were obtained. 1. When arranging the telephone terminals on the LAN, it is not necessary to receive power supply from the commercial power supply via the AC adapter for each telephone terminal, and preparation work for installing the telephone terminals is facilitated. 2. Each time the installation position of the telephone terminal is changed, the operator does not need to manually clarify the installation position on the network, thereby improving the portability.

3. Further, since the voltage applied to the cable connecting the concentrator and the telephone terminal is low, it is possible to use a pair of unshielded stranded wires as a connection cable and a modular jack as a connector, thereby further improving the telephone. Installation of terminals has become easy and inexpensive. That is,
When installing or moving the telephone terminal, the operator only needs to insert the modular jack, which greatly improves the portability.

[Brief description of the drawings]

FIG. 1 is a block diagram of a power supply system according to a specific example.

FIG. 2 is an explanatory diagram of an operation of a power supply system according to a specific example.

FIG. 3 is a block diagram illustrating a configuration example of a LAN using the present invention.

[Explanation of symbols]

 Reference Signs List 1 telephone terminal detection unit 2 power supply control switching unit 3 cable 3A signal line 3B power supply line 3C ground line 4 telephone terminal 5 current monitoring unit 6 power supply unit 7 timer unit 8 LNK detection unit 9 LNK detection state monitoring unit 10 DC / DC converter 11 Control part A, B connector

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI H04M 19/08 H04L 11/14

Claims (4)

[Claims] 1. In a LAN (local area network) in which terminal devices are radially connected via a cable around a current collector, the cable transmits data signals transmitted and received between the terminal devices. And a power supply line for supplying power to the telephone terminal connected to the LAN. 2. In a LAN in which terminal devices are radially connected via a cable with a current collector as a center, a signal line for transmitting data signals transmitted and received between the terminal devices is connected to the LAN. A power supply unit that supplies power to the telephone terminal via a power supply line, a state in which the power supply unit supplies power to the power supply line, and a state in which power supply to the power supply line is stopped. And a current monitoring unit that monitors a value of a current flowing through the power supply line. In a state where power is supplied from the power supply unit to the power supply line, a current flowing through the power supply line is a telephone. Deviate from the specified current value range that should flow when the terminal is connected,
When the current monitoring unit detects, the power supply control switching unit switches from a state in which the power supply unit supplies power to the power supply line to a state in which power supply to the power supply line is stopped, to a LAN-compatible telephone terminal. Power supply system. 3. The power supply system for a LAN-compatible telephone terminal according to claim 2, further comprising: an LNK detection unit that monitors a signal line and confirms a link establishment of a terminal device connected to the signal line. In a state where power is supplied from the power supply line to the power supply line, the current flowing through the power supply line is within a range of a specified current value to flow when a telephone terminal is connected, and the LN
A power supply system for a LAN-compatible telephone terminal, wherein the power supply control switching unit continues the state in which the power supply unit supplies power to the power supply line when the K detection unit can confirm the link establishment. 4. The power supply system for a LAN-compatible telephone terminal according to claim 2, further comprising: an LNK detection unit that monitors a signal line and confirms a link establishment of a terminal device connected to the signal line. Power supply to a LAN-compatible telephone terminal, wherein the power supply to the power supply line is stopped, and the power supply to the power supply line is stopped when the LNK detection unit can confirm the link establishment. system.