JP2002319994A - Pulse control type line switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a line switching device which is applicable over a wide area by eliminating application limitations based upon line kinds and restrictions on a remote controller side. SOLUTION: The line switching device is installed at the border between electric communication line facilities and terminal facilities and electrically disconnects (releases) and switches back (connects) the electric communication line facilities and terminal facilities under remote control. Here, the disconnection control and the connection control are carried out with a control signal composed of a combination of at least two pulse trains using the normal line voltage of the electric communication line facilities.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided at a demarcation point of responsibility between a telecommunications line facility set up by a first-class telecommunications carrier and a terminal facility connected to a user. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line disconnecting device capable of separating equipment from terminal equipment.

[0002]

2. Description of the Related Art As shown in FIG. 4, a line disconnecting device is installed at a boundary between a telecommunications line facility installed by a telecommunications carrier and a terminal facility connected to a user. Under the control of a telecommunications carrier, the telecommunications line equipment and the terminal equipment are electrically disconnected (open) or switched back (connected). Conventionally, when such a line disconnecting device is remotely controlled, the control is performed based on the DC voltage level of the line. That is, in the conventional control method, the disconnection control is performed using a unipolar high voltage. Further, after the disconnection control, a voltage having a polarity opposite to that of the voltage is used to control the switching back state.

[0003]

FIG. 5 shows an example of a DC voltage level control signal from a telecommunications carrier used for controlling a conventional line disconnecting device.
(b) is a switchback control signal. As is apparent from this figure, the DC voltage level control signal from the telecommunications carrier is a unipolar high voltage higher than the normal line voltage from the reference potential during the disconnection control, and the reference potential and the voltage from the reference potential during the switchback control. Must have voltages of opposite polarity.

Therefore, in the above-described conventional control method, control is performed based on the DC voltage level of a line. However, a power supply for generating a high voltage for the control is provided by a power supply for generating a normal line voltage. It is required separately. Also, because of the high voltage, the DC voltage level of
Since it deviates from the electrical condition of the line terminating device such as U, it cannot be applied to a line such as ISDN.

Further, in order to return the line to a communicable state after the disconnection control is performed, it is necessary to always perform the control with the voltage of the opposite polarity. In other words, the reverse control is performed when a voltage of the opposite polarity is applied, so that for a line test in a line disconnected state, the line disconnecting device applies the voltage applied for the test to the line disconnection device. There is a restriction that the voltage must be set so as not to perform the switchback operation.

[0006] Therefore, it is desired that the line disconnecting device separates the line without using a high voltage, and does not limit the applied voltage even during the line test during disconnection. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, to eliminate a restriction on application by a line type and a restriction on a remote control device side, and to realize a line separation device applicable to a wide range.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is provided at a boundary between a telecommunication line facility and a terminal facility, and the electric power of the telecommunication line facility and the terminal facility is controlled by remote control. In a line disconnecting device that performs a disconnection (opening) and a switchback (connection), the disconnection (opening) control and the switchback (connection) control are performed by a predetermined pulse pattern using a normal line voltage of a telecommunications line facility. It is characterized in that it is performed by a control signal provided.

It is preferable that the control signal is composed of a combination of at least two pulse trains, and that the first pulse train indicates separation control, and the second pulse train indicates separation or cutback control.

In the present invention, the line state of the telecommunication line equipment is monitored during the disconnection state, and if the line voltage has continued for a certain period of time, it is automatically determined that the line has become communicable. It is characterized in that switchback control is performed.

[0010]

In the above solution, the line disconnecting device is controlled by a control signal composed of a pulse train using a normal line voltage instead of the DC voltage level control signal of the conventional line, so that a high voltage is not used. In addition to being able to separate the lines, it is also possible to eliminate restrictions on the applied voltage in the line test during disconnection.As a result, there are no restrictions on application by line type and restrictions on the remote control device side, It can be applied to a wide range. In addition, the autonomous switchback is performed after a certain period of time has passed by the line state monitoring, and the switchover state is restored.
Even when the switchback control signal has not arrived, it is possible to prevent the disconnection state from being maintained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings with reference to embodiments. FIG. 1 is a block diagram showing an embodiment of a pulse-controlled line disconnecting device according to the present invention, and FIG. 2 is used for controlling a pulse-controlled line disconnecting device according to the present invention.
FIG. 6 shows an example of a control signal composed of a combination of two or more consecutive pulse trains defined in advance, wherein (a) is a disconnection control signal, which has a first pulse train having three pulses and two pulses in this example. The first pulse train represents the separation control, and the second pulse train represents the separation control. (b) is a switchback control signal, which in the present example is composed of a combination of a first pulse train having three pulses and a second pulse train having one pulse, and the first pulse train represents cutting control;
The second pulse train represents the switchback control. These pulse trains are usually formed using line voltage.

In the line disconnecting device 1 of the present invention, the line voltage detecting section 2 always detects the line voltage and supplies the detected line voltage information to the monitoring control section 3. The monitoring control unit 3 monitors the line voltage information over time, and the change in the voltage is monitored as shown in FIG.
As shown in (a), when the signal matches a disconnection control signal composed of a combination of two or more consecutive pulse trains defined in advance, the line disconnecting unit 4 is instructed to disconnect. Similarly,
As shown in FIG. 2 (b), when the signal matches a switchback control signal composed of a combination of two or more consecutive pulse trains defined in advance, the line switcher 4 is instructed to switch back.

The line disconnecting unit 4 opens or closes the switch 5 inserted into the line and executes disconnection or return of the line in response to the disconnection instruction or the return instruction from the monitoring control unit 3. .

When the state of the line disconnecting device is in the disconnected state and the normal line voltage state is detected for a certain period of time as shown in FIG. Instruct the division unit 4 to switch back. The line disconnecting unit 4 also closes the switch 5 inserted in the line in response to the switchback instruction from the monitoring control unit, and executes the line switchback.

In the above-described embodiment, the disconnection / return control signal is composed of a combination of the first pulse train and the second pulse train. However, such a pulse control signal is composed of a pulse pattern constituting the combination. Therefore, the number of pulse trains can be set to an arbitrary number of 2 or more, and the number, width and position of pulses in the pulse train can also be set arbitrarily.

[0016]

As described above, according to the present invention,
Since the line disconnecting device is controlled by a control signal composed of a pulse train using a normal line voltage, a high voltage for control is not required, and the control device can be made smaller, more economical, and can be applied to lines such as ISDN. As a result, there are no restrictions on application by line type and restrictions on the remote control device side, and a line disconnection device applicable to a wide range can be realized. Furthermore, since the autonomous switchback is performed by the line state monitoring, it is possible to prevent the disconnection state from being maintained even when the switchback control signal has not arrived. When a control signal is defined by only one pulse train, if the number of control signals used for the line test is increased, the time length of the pulse train is increased, so that the transmission processing time is increased. However, when the control signal is composed of two pulse trains as in the above-described embodiment, the number of control signals is defined as N in the first pulse train and M in the second pulse train. , The number of control signals is N × M, but the transmission processing time is limited by the number of pulse trains, so that the transmission processing time can be reduced as compared with the case of one pulse train. The advantage is born. As described above, in one pulse train, when the number of control signals is increased, the transmission processing time is increased. However, even if the number of control signals is increased by using two or more pulse trains as in the above-described embodiment. In addition, an increase in transmission processing time is suppressed, and control with more expandability can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a pulse control type line disconnection device according to the present invention.

FIG. 2 is a diagram showing an example of a control signal used for controlling a pulse-type line disconnection device according to the present invention.

FIG. 3 is a diagram illustrating a switchback operation when the normal line voltage has continued for a certain period of time.

FIG. 4 is a diagram illustrating an installation mode of a line disconnecting device.

FIG. 5 is a diagram showing an example of a control signal used for controlling a conventional line disconnecting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Line disconnecting device 2 Line voltage detecting unit 3 Monitoring control unit 4 Line disconnecting unit 5 Switch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideki Arai 2-3-1 Otemachi, Chiyoda-ku, Tokyo Within Nippon Telegraph and Telephone Corporation (72) Inventor Kazuhiko Akiyama 2-3-1 Otemachi, Chiyoda-ku, Tokyo No. 1 Nippon Telegraph and Telephone Corporation F term (reference) 5K027 KK03 LL05 MM02 5K035 AA06 BB01 CC09 CC10 DD02 LL01

Claims (5)

[Claims] 1. A telecommunications line facility and a terminal facility, which are installed at a boundary between the telecommunications line facility and a terminal facility, and are electrically separated (opened) and returned (connected) by remote control.
Disconnecting (opening) in the line disconnecting device that performs
A line disconnecting device, wherein control and return (connection) control are performed by a control signal having a predetermined pulse pattern using a normal line voltage of telecommunication line equipment. 2. The control signal according to claim 1, wherein the control signal is composed of a combination of at least two pulse trains, and a first pulse train indicates separation control, and a second pulse train indicates separation or cutback control. Line disconnect device. 3. In the disconnection state, the line state of the telecommunications line equipment is monitored, and if the normal line voltage has continued for a certain period of time, it is determined that the line is in a communicable state and autonomous switchback control is performed. The line disconnecting device according to claim 1 or 2, wherein: 4. A line voltage detecting unit for detecting a line voltage of a telecommunication line facility, and line voltage information detected by the line voltage detecting unit is monitored over time, and a change in the voltage is defined in advance. Supervisory control for generating a disconnection instruction when a disconnection control signal consisting of a combination of two or more pulse trains is matched, and a switching back instruction when matching a switchback control signal consisting of a combination of two or more pulse trains defined in advance. And a line disconnecting unit that disconnects or switches back the line by opening or closing a switch inserted in the line in response to a disconnection instruction or a switchback instruction from the monitoring control unit. 3. The line disconnecting device according to claim 2, wherein: 5. The line according to claim 4, wherein when the monitoring control unit detects a normal line voltage state for a certain period of time in the disconnection state, a cutback instruction is issued to the line disconnecting unit. Cutting device.