JPH0761105B2 - Subscriber protector - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used for maintenance of telephones and other wired communication lines. INDUSTRIAL APPLICABILITY The present invention is used for a subscriber line in which a station and a subscriber are connected by a pair of lines. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protector for a subscriber, which is inserted at a demarcation point between an outdoor wiring and a domestic wiring of a subscriber line and includes a lightning arrester for short-circuiting and grounding an abnormally high voltage generated on the line. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protector for subscribers having a built-in relay contact that can separate outdoor wiring and home wiring by remote control.

[0002]

2. Description of the Related Art It has become possible for subscribers to freely connect devices to terminals such as telephones and other communication lines, and to change the wiring at home. It has become possible for operators to carry out maintenance management based on the line contract. In this case, it is necessary to separate at the maintenance demarcation point. That is, when a failure occurs in the communication line, it is necessary to determine whether the failure location is the outdoor wiring or the home wiring. If maintenance workers are dispatched to the pull-in point of the outdoor wiring for this division, the man-hour will increase. For this reason, a circuit for separation is mounted inside the subscriber protector including a lightning protection element inserted at the demarcation point between the outdoor wiring and the indoor wiring, and the circuit for separation is operated by remote control from the station and Subscriber protectors that can be monitored have come into use.

As an example of this, a subscriber's security device including a pair of office line terminals, a grounding terminal, a lightning arrester connected between the pair of office line terminals and the grounding terminal, and a pair of home extension terminals The terminal has a built-in terminating circuit that is connected between station line terminals when it is connected between a pair of station line terminals, and a relay contact is provided to normally connect the station line terminal and the home terminal to a closed circuit. The station line terminal is connected to the terminal circuit by releasing the closed state by a separation control signal sent from the station by remote control. In order to remotely control this relay contact, connect a special device installed in the station to this station line, send a cut control signal to this station line, perform loop loopback test, etc. in the cut state, and then cut it. A return control signal is sent to the office line to switch the relay contact back to the normal closed state. In the subscriber protector, a control circuit that detects the separation control signal sent between the office line terminals to set the open state and detects the cutback control signal to set the closed state is installed inside. ing.

[0004]

On the other hand, in the line maintenance work of the subscriber line, it is necessary to properly connect the line on the station side and the line on the subscriber side so as not to mix up with other subscribers. Therefore, in order to confirm the connection, a work procedure is required such as sending a calling signal to the subscriber's line to have the subscriber terminal respond, and asking the person who responded to ask for the subscriber number. In such work procedures, for example, many pairs of subscriber lines are disconnected at once due to a disaster or a traffic accident,
When this is restored, it is necessary to confirm all the subscriber lines, and the number of man-hours required for this work is extremely large. Also, the subscriber side does not always get a response due to absence or the like. Moreover, the subscriber is a customer for the telecommunications carrier, and it is not appropriate to bother the customer each time for maintenance work.

The present invention focuses on mounting a device capable of identifying not only the line but also the line on the subscriber protector capable of remote control as described above.

That is, a subscriber protector inserted at the demarcation point between the outdoor wiring and the in-house wiring can be separated at the maintenance demarcation point by remote control from the station side, and even if the subscriber does not respond. An object of the present invention is to provide a device capable of confirming connection of a subscriber line. A further object of the present invention is to provide a device which is in harmony with the line division using the existing subscriber protector.

[0007]

According to the present invention, a memory circuit in which a unique identification code is set is mounted in a subscriber protector that can be separated by remote control, and the memory circuit is set according to the operation of the remote control. An identification code sending circuit for sending the identification code set in the memory circuit through the relay contact is provided.

The identification code sent to the line can be displayed on the station side device, whereby the connection can be confirmed without a response from the operation of the subscriber device.

That is, according to the present invention, a pair of office line terminals (L
1, L2), a ground terminal (E), a pair of station line terminals, and a lightning arrester (AR) connected between the ground terminals.
A pair of home line terminals (I1, I2), a terminating circuit (T) connected between the station line terminals when connected between the pair of station line terminals, and the station line terminal and the terminal circuit when closed. Relay contacts (r1, r2) that connect to the extension terminals and disconnect the station terminal from the extension terminals when the terminals are open, and connect the termination circuit between the pair of station terminals, and control the relay contacts. In a subscriber's security device, which is provided with a control circuit (CONT) that detects a disconnection control signal between the pair of station line terminals and detects the switchback control signal that is in the open state and is in the closed state, A storage circuit (MEM) having an identification code set therein and an identification code transmission circuit (IDG) for transmitting the identification code set in the storage circuit between the pair of station line terminals via the relay contact are provided. Characterized by

In the subscriber protection device of the present invention, the power supply current used in the identification code sending circuit (IDG) and the memory circuit (MEM) is branched from the DC holding current flowing in the termination circuit (T). It is characterized in that it is provided as an internal power source for the subscriber protector.

The control circuit (CONT) is provided with a light emitting element (P1S) which conducts and emits light in the inverted state, and the circuit for branching the power supply current receives the output light of the light emitting element and conducts electricity. The light receiving element (P1R) is connected in series . The thyristor type light receiving element is
Once the light is received, it becomes conductive, and once
It is an element that continues to conduct as long as the current continues.

It is necessary to connect a time constant circuit (C1) having a time constant longer than the chattering duration of the relay contacts (r1, r2) to the drive circuit of the light emitting element (P1S).

[0013]

[Function] When the communication line is normally used, the relay contact (r
1, r2) are office line terminals (L1, L2) and home terminals (I
1, I2) are connected. This relay contact is remotely controlled by a device installed on the station side. That is, when a test monitoring device installed on this station side sends a control signal to the station line to divide it, the relay in the subscriber's security device of the present invention operates, and the relay contact disconnects the home terminal and the station line terminal (L1,
L2) and the termination circuit (T) are connected. The DC holding current is held in its connection via this terminating circuit (T).
This isolation control signal is here the inversion of the DC polarity of the station line.

When this switching connection is performed, a part of the holding current is shunted and supplied as a power supply current to the identification code sending circuit (IDG), and the identification code stored in the storage circuit (MEM) is the local line terminal. It is transmitted serially to (L1, L2). The device provided on the station side receives and displays this identification code. Even if the identification code set in this subscriber protector does not necessarily correspond to the subscriber number, it can be translated into a subscriber number in another correspondence table, and especially for maintenance of the line, This identification code can be used as it is without taking the action of.

After the execution of the test, a switchback control signal is sent from the test monitoring device on the station side, and relay contact (r1, r2)
Set to normal use. The switchback control signal here is to restore the DC polarity of the office line to the normal utilization state.

The test monitoring device provided on the station side for performing remote control and displaying the identification code is preferably provided in the station where the exchange is installed, but it is designed to be portable so that it can be used at the site of track maintenance. You can also do it.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a protector for a subscriber according to an embodiment of the present invention. This subscriber protector is installed in the same manner as a normal subscriber protector at the maintenance demarcation point where the central line is drawn into the subscriber's house, for example, under the eaves of the house. This device is provided with a pair of office line terminals L1 and L2, a ground terminal E, and a pair of home extension terminals I1 and I2. The terminals L1 and L2 are connected to the exchange of the office via the subscriber line. The terminals I1 and I2 are connected to the terminals installed in the house through the in-house wiring.

A pair of station line terminals L are provided in the subscriber protector.
1, a lightning arrester AR connected between L2 and an installation terminal. Further, this device is provided with fuses F1 and F2 for connecting the office line terminals L1 and L2 and the home extension terminals I1 and I2. These are well-known circuits provided so that an abnormal high voltage generated due to a contact with an electric power line or a lightning strike does not flow into an in-home device on an outdoor line.

When the circuit is closed, the office line terminals L1 and L2 are connected to the home extension terminals I1 and I2, respectively, and when opened, the station line terminals L1 and L2 are disconnected from the home extension terminals I1 and I2 to form a pair of station line terminals L1. , L2 are provided with relay contacts r1 and r2 for connecting the termination circuit T. The termination circuit T is a circuit that holds a loop current between the office line terminals L1 and L2 when the relay contacts r1 and r2 are disconnected from the home extension terminals I1 and I2.
Two light receiving elements are connected. Furthermore, the relay contacts r1 and r2 are controlled to detect a switching control signal between the pair of station line terminals L1 and L2 (in this example, the reversal of the direct current polarity between the station line terminals) to establish the open state, and then switch back. And a cut-off control circuit CONT for detecting a control signal (in this example, restoration of DC polarity between station line terminals) to bring the circuit into the closed state.

These configurations are conventionally known circuits that enable separation by remote control (Japanese Patent Laid-Open No. 2-17).
4354). Here, the feature of the present invention is that the memory circuit MEM in which a unique identification code is set, and the identification code that is connected to the termination circuit T and sends out the identification code set in the storage circuit MEM via the relay contacts r1 and r2. It is provided with a code sending circuit IDG. Further, a feature of the present invention is that a circuit for branching a DC holding current flowing through a termination circuit T from a DC holding current flowing in a termination circuit T (the branch point thereof in the figure) is used as a power source current (indicated as POW in the figure) used in an identification code sending circuit IDG and a storage circuit MEM (Displayed as D),
The division control circuit CONT is provided with a light emitting element P1S which conducts and emits light in a state of polarity inversion, and a thyristor type light receiving element P1R which receives the output light of the light emitting element P1S and conducts is connected in series to the branching circuit. ing.

Further, a time constant circuit (a capacitor indicated by C1 in the figure) having a time constant longer than the chattering duration of the relay contacts r1 and r2 is connected to the drive circuit of the light emitting element P1S.

The operation of the circuit configured as described above will be described. In a state where this line is normally used, that is, in a call state, a communication state, a call waiting state, etc., the relay contacts r1 and r2 are shown in FIG. Is ready to
The office line terminals L1 and L2 are connected to the home extension terminals I1 and I2. At this time, the control circuit CONT is not operating. That is, considering the call waiting state, as an example, since a zero potential is applied to the station line terminal L2 and a + 48V DC voltage is applied to the station line terminal L1, no DC current is generated in the control circuit CONT. In the call state or the communication state, since the home terminal device connected between the home extension terminals I1 and I2 connects the DC circuit, the inter-terminal voltage decreases, but the station line terminal L
1 has a positive potential with respect to the station line terminal L2, and in this case also, no direct current is generated in the control circuit CONT.

In the remote control state, the polarity of the DC voltage of the station line terminals L1 and L2 is inverted as a division control signal. In this embodiment, not only the above-mentioned + 48V is set to -48V, but a voltage having a somewhat large absolute value is applied. This is because in the polarity inversion state, a part of the holding current is shunted to be used as the power supply current by the identification code sending circuit, and the operation of the relay RL is ensured.

When the direct current polarities of the station line terminals L1 and L2 are reversed, a direct current flows through the control circuit CONT to activate the relay RL. This relay RL allows relay contacts r1 and r
2 is switched, the extension terminals I1 and I2 are disconnected, and the terminal circuit T is connected between the office line terminals L1 and L2 via the fuse F2. This end circuit T has a photo coupler P.
Although the light receiving element for H2 is inserted, this light receiving element is set to be conductive in the non-light emitting state and non-conductive in the light emitting state. That is, the photocoupler PH2 is in a conductive state when the photocoupler PH2 is not operating, and a direct current is conducted to the termination circuit T. The relay RL is a latch relay.

In this state, the branch point D in FIG.
The power supply current is branched and supplied to the OW, and the identification code sending circuit I
DG starts. A detailed description of the power supply circuit of the identification code sending circuit IDG is omitted. This power supply current activates the clock signal generation circuit CLK, and the clock signal generation circuit CL
A clock signal is sent from K, and the identification code set in the memory circuit MEM appears as a serial pulse at the terminal SIG. This is supplied to the base of the transistor TR1 through the resistor R4, and the transistor TR1 is opened and closed according to the serial pulse of the identification code. In response to this, the photocoupler PH2 operates and the identification code is sent to the station line terminals L1 and L2 as a DC current intensity signal.

This serial pulse is monitored and displayed by the station side device. After receiving this serial pulse, the station side device can execute the loop turnback test and other tests in a state where the relay contacts r1 and r2 are connected to the termination circuit T.

When these tests are completed, the switchback control signal is transmitted from the station side device.

In the circuit of this embodiment, the light emitting element P1S is connected in series to the relay RL, and the light receiving element P1R of the light generated by the light emitting element P1S is inserted in series at the power supply current branch point of the identification code sending circuit IDG. Moreover, the light receiving element P1R is a thyristor type. That is, the conduction state is maintained even when the light emission of the light emitting element P1S is extinguished, and becomes non-conduction when the current of the light receiving element P1R disappears after the emission of light is extinguished. This is also for surely shutting off this power supply current by other line test and switchback control signals.

When current flows through the relay RL due to the DC polarity reversal of the station line terminals L1 and L2, the relay RL starts to operate. At this time, the light emitting element P1S emits light, and the light receiving element P1R becomes conductive. Relay contacts r1 and r2
When is switched, a current flows through the terminal circuit T, so that the DC voltage between the station line terminals L1 and L2 becomes small. Therefore, the light emission of the light emitting element P1S becomes weak. Even in this state, once the current starts to flow in the light receiving element P1R, the power supply current is not interrupted even if the light emission of the light emitting element weakens.

Further, in this embodiment, the capacitor C1 is connected as a time constant circuit to the drive circuit of the light emitting element P1S. This avoids the effects of relay chattering. The relay RL operates and relay contacts r1 and r
Even if 2 is switched, chattering occurs in the relay contact for a short time. When chattering occurs, the light receiving element P
When the DC current flowing through 1R is complicatedly changed, the conduction state may be interrupted. Therefore, after the relay RL is activated, the relay contacts r1 and r2
The light emission state of the light emitting element P1S is maintained by the capacitor C1 until the time during which the chattering has occurred. As a result, even if chattering occurs, the light receiving element P1R can be continuously maintained in the conductive state.

All of these are techniques obtained as a result of tests conducted under various conditions for the present invention.

Next, the identification code sending circuit IDG, which is a main part of the present invention, will be described in more detail. FIG. 2 shows a circuit configuration diagram of a memory circuit MEM that stores a unique identification code and a clock signal generation circuit CLK for reading the stored content of the memory circuit MEM into a serial pulse. The memory circuit MEM is composed of a plurality of cascaded programmable shift registers (five in this example). The programmable connection of each shift register indicated by the symbol x in FIG. 2 is set in advance according to the unique identification code assigned to the subscriber protector. The clock signal generation circuit CLK is provided with a crystal oscillating element XTAL, and the oscillation frequency is divided by a flip-flop circuit to be supplied as a clock signal to the clock signal terminal CK of each shift register. In addition, a control signal supplied to each shift register is generated according to this clock signal.

The identification code is 32 of 2 as a 32-bit structure.
It is possible to allocate as is. This identification code transmission circuit I
The signal output SIG of the DG was designed so that a signal of 32 bits + command bits was repeatedly transmitted twice for 0.13 seconds. FIG. 3 shows this signal waveform diagram. FIG. 3 shows a current waveform passing through the station line terminal L1 or L2.

The above embodiment is merely a design example,
The memory circuit may be designed in the same manner by using a ROM, a digital switch, or other memory circuit without using the programmable shift register. Further, the bit configuration and the transmission form can be freely designed according to the number of lines to be handled and the like. The clock signal generating circuit also has a property that it can be freely designed according to the purpose of use of a suitable line.

In the above example, the power supply current is divided from the direct current, but it is also possible to have a small power supply built-in or a structure in which the power supply current is supplied from the home terminal device.

Regarding the cut-off control signal and the cut-back control signal, a simple example using the direct polarity of the direct current polarity of the station line has been described in the above example, but various application forms of these control signals are also available. is there.

Next, a test performed by using the apparatus of this embodiment will be described.

FIG. 4 is a diagram showing an example of the configuration of a test monitoring apparatus provided on the station side for remotely controlling the subscriber security device. This test monitoring device is connected to a station line to which the subscriber security device of the present invention is connected, and a control signal generation circuit 20 for sending a cut control signal and a cut back control signal to the station line.
And a receiving circuit 2 for receiving and accumulating the identification code arriving at the station line
1 and a display circuit 22 for numerically displaying the accumulation result of the receiving circuit 21.

FIG. 5 is an overall configuration diagram for explaining how the device of the present invention is installed between a telephone station and a subscriber terminal. The protector for subscribers of the present invention is designated by the symbol P in FIG.
Is installed as. The test monitoring device on the station side described with reference to FIG. 4 is mounted on the test stand TS. Further, the station-side test monitoring device described in FIG. 4 is configured as a portable type and is used as the test monitoring device Q. The portable test monitor Q operates a self-contained battery power source and can be used on a utility pole or in a manhole.

Next, the test monitoring operation of these devices will be described with reference to FIG. When it is desired to confirm the connection between the exchange and the terminal from the test stand, the subscriber number of the terminal is dialed to connect to the terminal (reference numeral 40). The connection can be confirmed if the other party responds by sending a calling signal, but if the response from the terminal cannot be obtained for some reason, the connection cannot be confirmed by this method.

Therefore, in the case where the subscriber security device of the present invention is provided on the terminal side, when the control signal generating circuit 20 of the test monitoring apparatus of FIG. In the subscriber protector P, the relay contact is operated as described above to disconnect the office line from the terminal and simultaneously connect to the terminal circuit T (reference numeral 41). At this time, the line is connected to the demarcation point (herein, the subscriber protector), and immediately after the connection, the subscriber protector P sends out the set unique identification code (reference numeral 42). The test monitoring device on the station side receives this by the receiving circuit 21 and displays it on the display circuit 22. As a result, it is possible to confirm that the line on which the test bench is going to perform the test is the target subscriber line, even if there is no response from the terminal.

After the subscriber line is confirmed and the normal line test (reference numeral 43) is performed in this way, when the switchback control signal is sent from the control signal generation circuit 20, the relay contact is restored and the work is completed. (Reference numeral 44).

[0043]

As described above, according to the present invention, the subscriber protector inserted at the demarcation point between the outdoor wiring and the in-home wiring can be separated at the maintenance demarcation point by remote control from the station side. , Even if the subscriber doesn't answer
You can check the subscriber line connection.

According to the present invention, the identification code transmitting circuit is connected to the termination circuit of the subscriber's protector after the relay contact for separation operates, so that the identification code is transmitted during the line communication or in other normal states. The circuit is completely isolated and has no effect on communication. Also, by the same test as the existing line separation test at the maintenance demarcation point, the identification code is sent immediately after the disconnection contact operates, so it is in good harmony with the conventional system and the line is confused. It is possible to prevent the error caused by the above. Furthermore, to use an optical switch including a light emitting element and a light receiving element
In this way, the operation of dividing and switching back can be surely performed, and the present invention can be implemented without affecting the normal communication and the existing communication line test.

In the present invention, a thyristor is used as this optical switch.
By using a star-shaped element, it is possible to add from the test equipment side.
The isolation state can be maintained by the loop current of the incoming line.
And the relay connection using a capacity with a large time constant.
The chattering of the points prevents the operation of the thyristor element from operating.
Since it will not be stable, it will not be stable with the existing line disconnection circuit.
You can obtain a harmony device.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a subscriber security device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a memory circuit and a clock signal generation circuit of a subscriber security device according to an embodiment of the present invention.

FIG. 3 is a diagram showing an identification code waveform according to the embodiment of the present invention.

FIG. 4 is a diagram showing a configuration example of a test monitoring device installed on the station side according to the present invention.

FIG. 5 is an overall configuration diagram illustrating an embodiment of the present invention.

FIG. 6 is a sequence diagram illustrating a procedure of test connection and remote control according to the present invention.

[Explanation of symbols]

 L1, L2 Station line terminal I1, I2 Home extension terminal E Ground terminal AR Lightning element CONT Control circuit for cutting and switching back F1, F2 Fuse RL Relay r1, r2 Relay contact T Termination circuit IDG Identification code sending circuit MEM Memory circuit CLK clock Signal generation circuit D Power supply current branch point P1S Light emitting element P1R Light receiving element PH2 Photocoupler POW Power supply circuit of identification code sending circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuo Hattori 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Nippon Telegraph and Telephone Corporation (72) Inventor Masao Oba 1-1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (56) References Japanese Patent Laid-Open No. 1-3111661 (JP, A) Shoukai 63-140744 (JP, U)

Claims (1)

[Claims] 1. A pair of office line terminals (L1, L2), a ground terminal (E), a pair of office line terminals and a lightning arrester (AR) connected between the ground terminals, and a pair of homes. The extension terminals (I1, I2) are respectively connected to the station line terminal and the home extension terminal when closed, and when opened, the station line terminal is disconnected from the home extension terminal to terminate a terminal circuit (T) between the pair of station line terminals. ) Connecting relay contacts (r1, r2),
A control circuit (CONT) that controls this relay contact to detect a cut-off control signal between the pair of station line terminals to bring it into the open state, and to detect a cut-back control signal to put into the closed state.
And a storage circuit (MEM) in which a unique identification code is set, and an identification code set in the storage circuit between the pair of station line terminals via the relay contact. An identification code transmitting circuit (IDG) for transmitting, and a circuit for branching a power supply current used in the identification code transmitting circuit (IDG) and the memory circuit (MEM) from a DC holding current flowing through the termination circuit (T). , said control circuit (CONT) includes a light emitting element (P1S) to conduct light by the isolation control signal, conduct by receiving the output light of the light emitting element to a circuit for the branch
Light receiving elements (P1R) are connected in series, the light-receiving element
(P1R) exceeds a predetermined value even after the light emission of the light emitting element is extinguished
Thyristor type that maintains conduction when there is a current
And the relay contact in the drive circuit of the light emitting element (P1S).
Time constant longer than the chattering duration of (r1, r2)
A security device for a subscriber, to which a time constant circuit (C1) having is connected .