JPS6282860A - Feeding system for digital subscriber's line - Google Patents

Abstract

PURPOSE:To attain feeding to respective terminals under simple control by depressing an originating key formed in a receiving circuit to the terminal side to make feeding current flow and detecting the feeding current to invert the polarity of a reverse circuit and turn on the receiving circuit. CONSTITUTION:When a terminal 5 is not used, the reverse circuit 31 is kept at the status shown by the dotted line the polarity of the upper line and lower line is '-' and '+' respectively. Thereby, current does not flow into respective receiving circuits 46, 56 and the circuits 46, 56 are not turned on because of the interrupting action of diodes 47, 55. When a call is generated from the terminal 5, a loop is formed by depressing an originating (ORG) key 54 and feeding current flows into the circuits 46, 56. An origination detecting circuit 24 detects the current flow, actuates an RV relay 23 and inverts the polarity of the reverse circuit 31 as shown in a solid line. Consequently, the polarity of the subscriber's line is changed as the point of an arrow, so that the receiving circuit 46 is turned on, a PON relay 48 is also driven, a switching circuit is also switched as shown in a solid line, and then the receiving circuit 56 is also turned on.

Description

[Detailed Description of the Invention] [Summary] This is a digital subscriber line power supply system that attempts to supply power from the exchange side to the terminal side by simple control by starting from the terminal side and reversing the polarity. be.

[Industrial application field]

The present invention relates to a digital subscriber line power supply system.

In a digital telephone system, the subscriber line generally connects the customer's premises (!!
From there, as shown by arrows, power is intensively supplied to terminals 50 and 51 connected to the bus via subscriber lines and the network 4.

In this case, in order to avoid wasting power, the so-called "rcall by call power supply", which supplies power only while the terminal is in use,
Usually done.

[Conventional technology]

In the conventional digital subscriber line power feeding system, when a call is made from a terminal, the terminal sends a signal to form a loop to the NT inside the premises, and that signal causes a loop current to flow through the power receiving circuit of the NT, and this current is transferred to the exchange side. was detected and activated the RV relay. This relay reversed the polarity of the reverse circuit and supplied power from the power supply circuit to each terminal.

[Problem that the invention seeks to solve]

However, when forming a loop, the conventional technology has a problem in that the loop control is complicated and the circuit configuration is difficult.

[Means for solving problems]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to easily notify the exchange side of the call when the terminal makes a call, thereby operating the RV relay and easily supplying power to the terminal.

The principle is that, as shown in Figure 1, when the terminal 5 is not used, the reverse circuit 31 is as shown by the broken line, and the polarity of each line is (-) on the top and (+) on the bottom. Therefore, due to the blocking action of the diode circuits 47 and 55, current does not flow to each power receiving circuit 46 and 56, so that they are not turned on.However, when making a call from the terminal 5, the call origination (ORG) key 5
When 4 is operated, loop L is formed and the power supply current flows.

This is detected by the call detection circuit 24, and the RV relay 23 is operated to invert the polarity of the reverse circuit as shown by the solid line. As a result, the polarity of the subscriber line changes as shown by the tip of the arrow, the power receiving circuit 46 turns on, and at the same time the P ON relay 48 also operates, thereby causing the switching circuit to switch as shown by the solid line. Therefore, the polarity of the connection line also changes as indicated by the tip of the arrow, and the passive circuit 56 is also turned on.

[For production]

As described above, according to the present invention, when making a call from the terminal side to the exchange side, a loop can be formed and the power supply current can be passed by operating the "calling key" provided on the terminal side power receiving circuit. is detected by the call detection circuit on the exchange side, activates the RV relay, reverses the polarity of the reverse circuit, and turns on the power receiving circuit of the NT and terminal inside the house.
Power can be supplied to each terminal with a simpler operation than before.

(Examples) Hereinafter, the present invention will be described by way of examples with reference to the accompanying drawings.

FIG. 2 is a diagram showing an embodiment of the first invention of the present invention.

In the system shown in Fig. 2, the digital subscriber circuit 2 on the exchange side and the NT4 and terminal 5 on the premises are interconnected by subscriber lines, and the reverse circuit 31 on the exchange side is operated by the calling signal from the terminal side. , from the power feeding circuit 3 to each power receiving circuit 4
6.56 to supply power to the NT4 and the terminal 5.

The digital subscriber circuit 2 on the exchange side is the data transmission circuit 2
2. P S F (Power 5 selection)
It consists of a filter 211, a call detection circuit 24, and an RV relay 23, to which a power supply circuit 3 and a reverse circuit 31 are connected.

The PSF 21 is a circuit that has a high impedance with respect to the transmission signal, and is a filter that only passes electric power.

In addition, the reverse circuit 31 is connected to the RV by receiving a call from the terminal 5.
This is a circuit whose polarity is reversed when the relay 23 operates.

NT4 inside the house is data transmission time +Y341, PSF4
2.43, a switching circuit 44, a branch path 45, a power receiving circuit 46, a diode circuit 47, and a PON relay 48.

In addition, the terminal 5 inside the house has a data transmission circuit 52 and a PSF 53.
, a call key 54, a diode circuit 55, and a power receiving circuit 56.

The operation of the embodiment of the first invention shown in FIG. 2 having the above configuration will be described below.

In the explanation, when the terminal TE5 is empty, that is, unused ((l)), when there is an incoming call to the terminal TE5, that is, when data is transmitted from the exchange side to the terminal side ((2)), when the terminal T
The transmission from the E5, that is, the case where data is transmitted from the terminal side to the exchange side ((3)), is divided into two parts.

(1) Terminal idle state In this case, the RV relay 23 of the digital subscriber circuit 2 does not work, so the reverse circuit 31 maintains the polarity shown. Therefore, as is clear from the figure, from the connection state of the feeder circuit 3 to the subscriber line, the polarity of the A line of the subscriber line is (
-), the polarity of the B line is (+).

However, the diode I'D constituting the diode circuit 47
The power supply from the subscriber line is blocked by I and DZ, and the power receiving circuit 46 is not turned on.

In addition, in this state, the power supply circuit 3 and the terminal 5 are connected to the branch path 45.
, are connected via a switching circuit 44. However, the diode D5. Db
Since the supply of power to the power receiving circuit 5G is blocked, the power receiving circuit 56 is not turned on.

(2) When there is an incoming call on the incoming TE to the terminal, the digital subscriber circuit (DLC)
)2 RV relay 23 is activated, the reverse circuit 31 is activated, and the power supply voltages have opposite polarities, that is, the A line becomes (+) and the B line becomes (-). As a result, current flows through the diode DzD+, the power receiving circuit 46 in NT4 operates, and the PO
N relay 48 operates. When the relay 48 operates, the switch PON of the switching circuit 44 switches as shown by the broken line, the branch path 45 is separated from the TE 5, and the TE power is supplied from the NT power receiving circuit 46 via the switching circuit 44. Data transmission between NTDLC becomes possible.

(3) Calling from a terminal When making a call from TE5, call key 0RG in TE
Operate 54. At this time, since the reverse circuit 31 has the polarity shown in the figure, the B line of the subscriber line is (+) and the A line is (-).
becomes. Therefore, branch path 45, diode circuit D3. D
4. Through the switching circuit 44, the polarity of the connection line is set to (31
(41 becomes (+), (1) and (2) become (-). Therefore, due to the turned on mechanical contact of 0RG54, TE
A loop L is formed inside, and current supplied from the DLC flows therethrough. The power supply current is detected by the call detection circuit 24, and when the call detection signal S is sent to the control circuit 221 of the transmission circuit 22, the RV relay 2 is activated by the operation signal S2 in the same way as an incoming call.
3 is activated, the reverse circuit 31 is activated and the power supply voltage is reversed, and the polarity of the subscriber lines A and H changes as shown by the arrow.

Therefore, the power receiving circuit 7!6, PON relay 48, and switching circuit 44 operate in the same manner as when receiving a call, and the polarity of the connection line also changes as shown by the arrow. Therefore, the power receiving circuit 56 is turned on, and data transmission to the terminal, NT, and DLC becomes possible.

The TE's ORG Key is a non-locking type, and power is normally supplied to the TE during one-touch operation, allowing DT listening, etc.

FIG. 3 is a diagram showing an embodiment of the second invention of the present invention,
The difference from the first invention is that the reverse circuit 461 is located inside the house.
4. Another difference from the first invention is that power is supplied to NT4.

The operation of this second invention is as follows.

(1) Terminal idle state Power is constantly being supplied to the NT4 inside the house from the exchange side via the subscriber line. In NT4, power receiving circuit 46
From this, power is supplied to TE5 with a negative potential to the connection line [1)-f21 and a positive potential to the line (3)-(41).

On the other hand, on the TE side, the diode circuit 55 brings the power supply line into an open state, and no current flows through the power receiving circuit in the TE.

(2) When there is an incoming call to the terminal from the exchange side to the TE5, the RV relay 463 in the NT is activated by a control signal between the NT4 and the exchange, and the polarity of the supply to the TE is reversed. Therefore, the power receiving circuit within the TE operates, and data transmission between the TE and the NT is started.

When the call ends, the RV relay in the NT is restored by a control signal from the exchange, and power supply to the power receiving circuit in the TE is stopped.

(3) Calling from a terminal When calling from a TE, the call key 0RG54 in the TE
(Non-lock). While the key 54 is being operated, a loop L is formed with respect to the power supply line, and a current temporarily flows through the power receiving circuit 56 of the TE, which is detected by the call detection circuit 462 in the NTA and sent to the exchange. The RV IJ relay 63 in the NT operates according to the control signal from the exchange side, as in the case of receiving the call in (2) above, and supplies power to the terminal 5.

In the TE, by operating the ○RG key, check the power-on display, the power is immediately turned on by the operation of the RV relay, and the D
Confirm activation using T, etc., and start dialing.

In the NT, when a current is detected for a certain period of time, a calling signal is sent to the exchange even if the current is turned off.

In addition to ending a call, the NT RV relay 463 recovers when call signal data (Info 1 signal in ISDN) is not received from the TE within a certain period of time after the RV relay operates while waiting for a call. (abandoned mid-way).

〔Effect of the invention〕

As described above, according to the present invention, when a call is made from the terminal side to the exchange side, a loop can be formed and a current of power can be sent by operating the call origination key provided on the terminal side power receiving circuit. This can be detected by the call detection circuit on the exchange side, activates the RV relay, reverses the polarity of the reverse circuit, and turns on the power receiving circuit of the NT and terminal inside the house, making each terminal easier to operate than before. It is possible to supply power to

[Brief explanation of drawings]

Fig. 1 is a diagram showing the principle of the present invention, Fig. 2 is a diagram showing an embodiment of the first invention of the invention, Fig. 3 is a diagram showing an embodiment of the second invention of the invention, and Fig. 4 is a diagram showing an embodiment of the invention. It is an explanatory diagram of the field of use of. DESCRIPTION OF SYMBOLS 1... Exchange side network, 2... Digital subscriber circuit, 3... Power supply circuit, 4... In-home line termination device 5... In-home terminal.

Claims (1)

[Claims] 1. Digital subscriber circuit (2) and network (1)
In this system, the exchange side consisting of a digital subscriber terminal (5) and a line termination device (4) are connected by a subscriber line and power is supplied to the terminal, and the terminal has a call key (54). and a diode circuit (55) that blocks the power supply current when the terminal is not in use, and a power receiving circuit (56).
In addition, the line termination device is provided with the diode circuit, the power receiving circuit (46), a branch bus (45) through which a power supply current flows when the terminal is not used, and the terminal is connected to the power receiving circuit of the line termination device or the above. A switching circuit (44) is provided for switching the connection to the branch bus, and the digital subscriber circuit is further provided with a power supply circuit (3), a reverse circuit (31) for reversing the polarity of the power supply circuit, and a terminal A call detection circuit (2) detects the power supply current in response to a call from
4), when the terminal is not in use, the diode circuit of the terminal prevents the power supply current from flowing to the power receiving circuit of the terminal, and when a call is received to the terminal, the reverse circuit operates and the polarity of the power supply circuit is changed. In reverse, first the power receiving circuit of the line terminating device is turned on, then the switching circuit connects the terminal and the power receiving circuit of the line terminating device, the power receiving circuit of the terminal is turned on, and when a call is made from the above terminal, the above By operating the call key and setting a loop, the power supply current that flows is detected by the call detection circuit, and first the reverse circuit is operated to reverse the polarity of the power supply circuit, and then the power receiving circuit of the line termination device is activated. A digital subscriber line power feeding system characterized in that when the power receiving circuit is turned on, a switching circuit connects the power receiving circuit and the terminal, and finally the power receiving circuit of the terminal is turned on. 2. Digital subscriber circuit (2) and network (1)
In this system, the exchange side consisting of a digital subscriber terminal (5) and a line termination device (4) are connected by a subscriber line and power is supplied to the terminal. A diode circuit (55) and a power receiving circuit (56) are provided to block the power supply current when the terminal is not in use, and the line termination device is provided with a power receiving circuit (46) that is constantly supplied with power, and a power receiving circuit (46) that blocks the power supply current when the terminal is not in use. A call detection circuit (4) detects the power supply current in response to a call from
62) and a reverse circuit (461) for reversing the polarity of the power supply from the power receiving circuit. When the reverse circuit operates, the polarity of the power receiving circuit of the line termination device is reversed, and the power receiving circuit of the terminal is turned on. A digital subscriber line power supply system, characterized in that the power supply current is detected by the call detection circuit and the polarity of the reverse circuit is reversed to turn on the power receiving circuit of the terminal.