JPH08114527A - Transmission line fault detecting system - Google Patents

Abstract

PURPOSE: To detect a disconnected condition of a transmission cable of a short distance, and detect not only an optical fiber cable but also a disconnected condition of an electric line by installing a jig composed of a turning-back and sending-out means and a light emitting means on the other end side of the transmission cable so as to be freely connectable. CONSTITUTION: In the case where a transmission cable 4 is put in a disconnected condition, when a photoelectric turning-back jig 5 composed of a turning back and sending-out means 18 and a first light emitting means 24 is installed on the other end side of the transmission cable 4 so as to be freely connectable, an operator can inspect a disconnected condition of the transmission cable 4 while confirming light emission of the first and second light emitting means 24 and 26 by means of visual observation. When the disconnected condition of the transmission cable 4 is detected by using the jig 5 having such a simple constitution, even a disconnected condition of a transmission cable of a short distance can be detected, and not only a disconnected condition of lines 12A and 12B for a light signal but also a disconnected condition of an electric power supply line 13A and an earth line 13B can be detected.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 1 and 2) Action (FIGS. 1 and 2) Example (1) Configuration of Video Camera Device (FIG. 1) (2) Configuration of Transmission Line Fault Detection System (FIG. 2) (3) Operation of Embodiment (FIGS. 1 and 2) (4) Effect of Embodiment (FIGS. 1 and 2) (5) Other Embodiments The invention's effect

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission line fault detection system, and is suitable for application to a transmission line fault detection system for detecting a disconnection state of a transmission line which occurs when optical communication is performed using an optical fiber cable. It is a thing.

[0003]

2. Description of the Related Art Conventionally, an optical fiber cable used as a transmission line in an optical communication system is usually formed in a unit of several hundred meters in length, and these are connected in multiple stages via an optical connector. Therefore, the transmission distance can be increased over several kilometers. However, in the case of long-distance transmission using such an optical fiber cable, if the optical fiber cable is broken or dust is attached to the end face of the optical connector, the transmission line will be disconnected and data transmission There was a problem that caused a failure.

Therefore, when a failure occurs in the data transmission, the position where the failure occurs in the optical fiber cable and the optical connector (hereinafter referred to as the optical fiber failure position).
Therefore, a so-called optical fiber failure detection device (not shown) has been proposed as the detection means.
This optical fiber failure detection device measures the reflected light generated by the difference in the refractive index between the open end (that is, the obstructed point) formed by the cut surface of the optical fiber cable and the air existing outside the open end. By doing so, the optical fiber fault position of the optical fiber cable is detected and displayed based on the measurement result.

[0005]

However, in this type of optical fiber failure detection device, it is necessary to provide a refractive index measuring circuit in the device, and power is supplied or charged in the device. However, there is a problem in that the configuration of the entire device becomes complicated because it is necessary to store the device. In addition, there is a problem that the optical fiber fault position cannot be detected when the optical fiber cable has a short distance. Furthermore, when the optical fiber cable includes an electric wire, the electric wire is disconnected when the electric wire is cut. Since the cutting position could not be detected, there was still an insufficient problem.

The present invention has been made in consideration of the above points. By detecting the disconnection state of the transmission cable by using a jig having a simple structure, the disconnection state of the short-distance transmission cable can be detected. The present invention is intended to propose a transmission line failure detection system that can detect not only the disconnection state of an optical fiber cable but also the disconnection state of an electrical line.

[0007]

In order to solve such a problem, in the present invention, at least two optical signal lines 1 are provided.
2A, 12B, power supply line 13A and earth line 1
In the transmission path failure detection system 10 for detecting a failure of the transmission cable 4 having 3B, an output section 11 connected to one end side of the transmission cable 4 and a repairing tool attached to the other end side of the transmission cable 4 in a freely connectable manner. Output part 1 consisting of tool 5
Reference numeral 1 denotes a transmitting means 16 for transmitting the optical signal W1 to the first optical signal line 12A, a receiving means 19 for receiving the optical signal W1 from the second optical signal line 12B, and a power supply line 13A.
A connection switch for connecting a power supply 17 for supplying a power supply voltage to the ground line 13B to the ground potential when the receiving means 19 receives the optical signal W1 and opening the ground line 13B when the receiving means 19 does not receive the optical signal W1. Means 21, 22
The jig 5 includes a return sending means 18 for returning the optical signal W1 from the first optical signal line 12A to the second optical signal line 12B and sending the optical signal W1, a power supply line 13A and an earth line 13B. First light emitting means 2 connected in between
4 and.

Further, according to the present invention, the jig 5 is configured such that the return-feeding means 18 and the first light emitting means 24 are housed in a predetermined housing.

Further, in the present invention, the output unit 11 is
When the second light emitting means 26 and the receiving means 19 receive the optical signal W1 and the predetermined voltage based on the power supply voltage is returned from the earth line 13B, the light emitting control means 21 for causing the second light emitting means 26 to emit light, 23 and 28 are provided.

Further, in the present invention, the transmission cable 4
Is a transmission cable that connects the camera unit 2 having the image pickup means and the camera control unit 3 that controls the camera unit 2. The camera control unit 3 having the output unit 11 installed therein is connected to one end of the transmission cable 4. Together with the camera section 2
Instead, the jig 5 is connected to the other end of the transmission cable 4.

[0011]

When the transmission cable 4 is disconnected, the return sending means 18 and the first feeding means 18 are provided from the other end side of the transmission cable 4.
By attaching the jig 5 composed of the light emitting means 24 in a connectable manner, the operator can detect the disconnection state of the transmission cable 4 while visually confirming the light emission of the first and second light emitting means 24 and 26. Thus, by detecting the disconnection state of the transmission cable 4 using the jig 5 having such a simple structure, the disconnection state of the short-distance transmission cable can be detected and the optical signal lines 12A and 12 can be detected.
Not only the disconnection state of B, but also the disconnection states of the power supply line 13A and the ground line 13B can be detected.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Structure of Video Camera Device In FIG. 1, reference numeral 1 denotes a video camera device as a whole, which is a camera head unit (hereinafter referred to as CHU) including a video camera body installed in a studio or a relay site and a viewfinder. 2) and a camera control unit for controlling the CHU2 (hereinafter referred to as CC
(Referred to as U) 3 is connected by an opto-electric composite cable 4.

In this case, the CHU 2 is adapted to send a video signal obtained by electrically converting a video by an image pickup device provided therein to the CCU 3 via the opto-electric composite cable 4. On the other hand, CCU3 is an opto-electric composite cable 4
Power is supplied to the CHU2 via the CHU2, and various control signals input from the outside are transmitted / received and transmitted to the CHU2 via the opto-electric composite cable 4.

The opto-electric composite cable 4 is a opto-electric composite connector in which one end and the other end have a male shape and a female shape for each cable of a predetermined length unit (hereinafter referred to as a unit cable) (see FIG. It is connected in multiple stages by means of not shown) so that the opto-electric composite connector can be detached at each connection part of the opto-electric composite cable 4 and fitted into the external opto-electric folding jig part 5. ing.

Further, the CCU 3 is provided with a predetermined mode selection operation switch (not shown), and a setting mode for functioning as the video camera device 1 (for example, controlling the CHU 2) based on the operation of the operator. The setting mode for detecting the disconnection state of the optical-electrical composite cable 4 can be selectively switched.

If the opto-electric composite cable 4 is disconnected, the operator switches the CCU 3 to a setting mode for detecting the disconnection condition of the opto-electric composite cable 4 to connect to the CCU 3. The optical / electrical composite cable 4 is switched and connected to an optical / electrical composite fault detection device (not shown) provided inside the CCU 3.

After this, the operator sequentially removes only one opto-electrical composite connector at each connecting portion provided for each unit cable of the opto-electrical composite cable 4 from the CCU 3 side, and then the opto-electrical composite connector on the CCU 3 side is removed. It is fitted in the electric folding jig portion 5. In this state, the operator can detect the unit cable in the broken state from the opto-electric composite cable 4 by turning on the power switch 6 of the opto-electric composite fault detection device.

(2) Configuration of Transmission Line Fault Detection System That is, FIG. 2 showing the same parts as in FIG.
In the figure, reference numeral 10 indicates a transmission path failure detection system as a whole, and one end side of the opto-electric composite cable 4 is connected to the opto-electric composite failure detection device 11 and the other end side is fitted into the opto-electric folding jig 5. ing. Here, the opto-electric composite cable 4 includes a pair of optical fiber core wires 12A and 12B having a bidirectional relationship with each other and a power supply wire 13.
A and the GND wire 13B corresponding to this, and the other electric wires 14 are provided in a predetermined number, respectively, and these are combined and configured.

In this case, the pair of optical fiber core wires 12A and 12B are provided for bidirectional data transmission between the CCU3 and CHU2, and the power supply wire 13A and the corresponding GND wire 13B supply power from CCU3 to CHU2. The other electric line 14 is provided for supplying power, and is also provided for sending various control signals from the CCU 3 to the CHU 2.

The opto-electric folding jig 5 is a casing,
A jig (hereinafter, referred to as a U-link jig) 18 that is a U-shaped optical fiber core wire for connecting the optical fiber core wires 12A and 12B to each other in the housing, and a power supply line 1
LE for display for connecting between 3A and GND line 13B
And D24 are provided. As a result, since it is not necessary to provide a power supply circuit to the electric folding jig 5, the electric folding jig 5 can be configured to be relatively small and lightweight.

When the power switch 6 (FIG. 1) is turned on in the opto-electrical composite fault detection apparatus 11, the drive circuit 15 sends the emission signal S1 to the light emitting section 16 and the power supply section 17 as well. The power signals S2 and S3 are the power line 13A and the display L of the optical-electrical composite cable 4, respectively.
It is supplied to the ED 26.

The light emitting section 16 electrically / optically converts the transmission signal S1 supplied from the driving circuit 15 and then outputs this to the optical signal W1.
Is transmitted to the optical fiber core wire 12A of the optical-electrical composite cable 4. As a result, the optical signal W1 transmitted from the light emitting unit 16 propagates through the optical fiber core wire 12A of the optical-electrical composite cable 4 and is sent to the U-link jig 18 of the optical-electrical folding jig 5. This optical fiber core wire 1
The optical signal W1 propagated from 2A is transmitted through the optical fiber core wire 12
Since A and 12B are connected to each other by the U-link jig 18, they are propagated back to the optical fiber core wire 12B.

Optical signal W propagating through the optical fiber core wire 12B
Reference numeral 1 denotes a light receiving section 19 in the opto-electric composite fault detection device 11.
The light receiving unit 19 optically / electrically converts the optical signal W1 and then sends it to the receiving circuit 20 and the input disconnection detecting circuit 21 as an electric signal S4. Input disconnection detection circuit 21
Detects the optical power level of the electric signal S4 and sends the detection signal S5 to the switching switch 22 and the AND circuit 23 based on the detection result.

That is, the optical fiber core wires 12A and 12
At least one of the B signals is disconnected and the optical signal W1
Is not transmitted to the light receiving section 19, or if the optical signal W1 is not transmitted to the light receiving section 19 due to dust or the like adhering to the end face of the optical / electrical composite connector at a predetermined connection portion of the optical / electrical composite cable 4, the light receiving section 19 is received. Electrical signal S output from 19
The optical power level of No. 4 becomes the “L” level. As a result, the input disconnection detecting circuit 21 switches the switching switch 22 to the off state by sending the detection signal S5 representing the "L" level to the switching switch 22.

On the other hand, both the optical fiber core wires 12A and 12B are not in a broken state, and the optical signal W1 is not received.
When the optical signal W1 is transmitted to the light receiving section 19, or when dust or the like is hardly attached to the end faces of the optical / electrical composite connector at all the connection parts of the optical / electrical composite cable 4, Electrical signal S4 output from section 19
The optical power level of is at "H" level. As a result, the input break detection circuit 21 detects the detection signal S representing the "H" level.
By sending 5 to the changeover switch 22, the changeover switch 22 is turned on.

The power supply signal S output from the power supply unit 17
2 is sent to the display LED 24 of the opto-electric folding jig 5 via the power supply line 13A of the opto-electric composite cable 4.
Here, when at least one of the power supply line 13A and the GND line 13B is in a disconnection state, the power supply signal S2 is not sent to the display LED 24.
4 does not flash light. On the other hand, when neither the power supply line 13A nor the GND line 13B is in the disconnection state, the power supply signal S2 is sent to the display LED 24 and the resistor 25, and the power supply signal S2 is further switched via the GND line 13B. 22 and the AND circuit 23.

In the changeover switch 22, when the changeover switch 22 is turned on, G
The power supply signal S2 input via the ND line 13B is grounded, and as a result, the display LED 24 emits light and blinks. On the other hand, when the switching switch 22 is switched to the off state, the power supply signal S2 input via the GND line 13B is released, so that the display LED 24 does not emit light and blink.

The power supply signal S3 output from the power supply unit 17 is sent to the switching switch 28 via the display LED 26 and the resistor 27. At this time, in the AND circuit 23, the detection signal S5 representing the "H" level is input from the input disconnection detection circuit 21 and the GND line 13
When the power supply signal S2 is input via B, the AND circuit 23 sends the AND signal S6 to the switching switch 28. As a result, the switching switch 28 is switched to the ON state, and the power supply signal S3 is brought into the grounded state, so that the display LED 26 emits light and blinks.

On the other hand, in the AND circuit 23, the detection signal S indicating the "L" level from the input disconnection detection circuit 21.
When 5 is input and / or when the power supply signal S2 is not input through the GND line 13B, the AND circuit 23 does not output the AND signal S6. As a result, the switching switch 28 is switched to the off state, and as a result, the power supply signal S3 is opened, so that the display LED 26 does not emit and blink.

(3) Operation of the embodiment In the above configuration, when the opto-electric composite cable 4 is disconnected, the operator connects the opto-electric composite cable 4 in the CCU 3 to the opto-electric composite cable provided inside the CCU 3. Switch to the fault detection device 11. After that, the operator sequentially removes only one opto-electric composite connector at each connection portion provided for each unit cable of the opto-electric composite cable 4 from the opto-electric composite fault detection device 11 side,
The optoelectric composite connector on the CCU 3 side is fitted into the optoelectric folding jig 5.

At this time, the pair of optical fiber core wires 12A and 12B of the optical / electrical composite cable 4 are connected to the U-link jig 18 of the optical / electrical folding jig 5, and at the same time,
The power supply line 13A and the corresponding GND line 13B in the opto-electric composite cable 4 are connected to the display LED 24 of the opto-electric folding jig 5.

In this state, the operator turns on the power switch 6 of the opto-electrical composite fault detecting device 11 to output the optical signal W1 from the opto-electrical composite fault detecting device 11 to the optical fiber core wire 12A. The power supply signal S2 is output to the power supply line 13A.

As a result, the optical fiber core wires 12A and 12
When both B are not in a disconnection state, and when dust or the like is scarcely attached to the end faces of the optical / electrical composite connector at all connection parts of the optical / electrical composite cable 4, the optical signal W1 propagates through the optical fiber core wire 12A. Then, by the U-link jig 18, the optical fiber core wire 12B is folded back and propagated, and in the optical-electrical composite fault detection device 11, the switching switch 22 is switched to the ON state and the GND line 13B is grounded.

As a result, the power lines 13A and GN are further
If neither of the D lines 13B is open, the power signal S
2 is GND from the power line 13A via the display LED 24
It is sent to line 13B and thus the display LED 24 flashes. As a result, the display LED 26 provided in the combined optical and electrical failure detection device 11 also emits light and blinks along with the display LED 24.

On the other hand, in the opto-electric composite cable 4, if any one of the optical fiber core wires 12A and 12B, the power supply wire 13A and the corresponding GND wire 13B is in the disconnection state, the opto-electric composite failure is detected. In the device 11, the switching switch 22 is switched to the off state and GN
The D line 13B is opened. Therefore, the display LED2
Since 4 and 26 do not illuminate and blink, the operator can detect a unit cable in a broken state from the opto-electric composite cable 4.

In this way, for all the unit cables in the optical-electrical composite cable 4, the optical-electrical composite connectors at the respective connection portions provided for each unit cable of the optical-electrical composite cable 4 are sequentially arranged from the optical-electrical composite fault detection device 11 side. The removal of only one place and the connection to the photoelectric folding back 5 are repeated.

As a result, the operator has the display LED 24.
While visually confirming the blinking of the light emission of No. 26 and No. 26, it is determined which unit cable is disconnected from the optical / electrical composite cable 4 by the optical / electrical folding jig 5 and the optical / electrical composite fault detection device 1.
Can be recognized in 1.

Incidentally, in the case where the repair work is carried out after detecting the disconnection state of the optical / electrical composite cable 4, it is difficult to carry out the work for connecting the parts in the disconnection state. Work is performed to replace a unit cable in a broken state with a new one. Therefore, it is not necessary to detect a portion of the opto-electric composite cable 4 which is in the disconnection state, unlike the case where the disconnection state of the opto-electric composite cable 4 is detected using a conventional device (not shown).

In the transmission path failure detection system 10, the opto-electrical folding jig 5 is used as a protective cover for the opto-electrical composite connector on the open end side of the opto-electrical composite cable 4 so that the operator can operate the opto-electrical folding jig 5 accordingly. It can be prevented from being lost or lost.

(4) Effects of the Embodiments According to the above configuration, when the opto-electric composite cable 4 is in a disconnection state, the opto-electric composite fault detection device 11 is applied to all the unit cables in the opto-electric composite cable 4.
From the side, sequentially connect the opto-electric composite connector at each connection portion provided for each unit cable of the opto-electric composite cable 4
It is repeated to remove only the portion and connect to the photoelectric folding back device 5. At that time, the operator must display the LED
By visually confirming the blinking of the light emission of 24 and 26, it is possible to detect which unit cable in the optical-electrical composite cable 4 is in the disconnection state by the optical-electrical folding jig 5 and the optical-electrical composite fault detection device 11. it can.

In this case, since the opto-electric folding device 5 is constructed to be relatively small and lightweight without providing a power supply circuit, the disconnection state of the opto-electric composite cable 4 can be controlled by such a simple construction. By detecting using the electric folding back jig 5, it is possible to detect the disconnection state of the short-distance transmission cable, and also to detect the optical fiber core wires 12A and 12A.
Not only the disconnection state of B but also the power supply line 13A and the GND line 13
The disconnection state of B can also be detected.

(5) Other Embodiments In the above embodiment, the case where the optical / electrical composite fault detection device 11 is provided inside the CCU 3 has been described, but the present invention is not limited to this, and the optical / electrical composite fault detection is not limited to this. Device 11 is C
The present invention can be applied even when provided separately from the CU3.

Further, in the above-mentioned embodiment, the case where the optical / electrical composite fault detecting device 11 is provided inside the CCU 3 has been described, but the present invention is not limited to this, and a predetermined circuit in the optical / electrical composite fault detecting device 11 can be used. The present invention can be applied even when the CCU 3 is provided in advance. That is, the drive circuit 1 in the opto-electric composite fault detection device 11 in FIG.
The present invention can be applied even when 5, the light emitting unit 16, the light receiving unit 19, the receiving circuit 20, and the power supply unit 17 are respectively provided in the CCU 3 in advance. In this case, the opto-electrical composite fault detection device is composed of an input break detection circuit 21, an AND circuit 28, switching switches 22 and 28, a display LED 26 and a resistor 27, which are connected as shown in FIG. Just go.

Further, in the above-mentioned embodiment, the optical fiber core wires 12A and 12B of the optical / electrical composite cable 4,
Although the case where the disconnection state is detected only for the power supply line 13A and the GND line 13B has been described, the present invention is not limited to this, and the same applies to the other electric wires 14 as in the case of the power supply line 13A and the GND line 13B. The invention can be applied by connecting in the same manner.

Further, in the above-mentioned embodiment, the operator sequentially removes only one opto-electric composite connector at each connecting portion provided for each unit cable of the opto-electric composite cable 4 from the opto-electric composite fault detection device 11 side. The case where the power switch 6 of the opto-electric composite fault detecting device 11 is turned on in response to the operation of connecting to the opto-electric folding jig 5 has been described. The present invention can be applied even if the power switch 6 of the electrical complex fault detection device 11 is turned on and the operator repeats the above operation in this state. In this way, by turning on the power switch 6 of the optical / electrical composite fault detection device 11 in advance, the operator connects the unit cables in the disconnected state among the optical / electrical composite fault detection device 11 to the optical / electrical composite cable 4. It is only necessary to move to the site, and it is not necessary to return to the opto-electric composite fault detection device 11 and operate again.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the video camera device 1 has been described.
The present invention is not limited to this, and is suitable for wide application to various electric devices configured by using the optical-electrical composite cable 4.

[0048]

As described above, according to the present invention, when the transmission cable is disconnected, the jig including the return sending means and the first light emitting means is connectably attached from the other end side of the transmission cable. Thus, the operator can detect the disconnection state of the transmission cable while visually confirming the light emission of the first and second light emitting means. Thus, by detecting the disconnection state of the transmission cable by using the jig having such a simple structure, it is possible to detect the disconnection state of the short-distance transmission cable, and not only the disconnection state of the optical signal line. It is possible to realize a transmission line failure detection system that can detect even the disconnection state of the power supply line and the ground line.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a video camera device according to the present invention.

FIG. 2 is a block diagram showing an embodiment of a transmission line failure detection system according to the present invention.

[Explanation of symbols]

1 ... Video camera device, 2 ... CHU, 3 ... CC
U, 4 ... Optical / electrical composite cable, 5 ... Optical / electrical folding jig, 6 ... Power switch, 10 ... Transmission line fault detection system, 11 ... Optical / electrical fault detection device, 12A, 1
2B ... optical fiber core wire, 13A ... power supply wire, 13B ...
... GND line, 15 ... drive circuit, 16 ... light receiving part, 17
...... Power supply unit, 18 ...... U-link jig, 19 ・ ・ ・ Light receiving unit, 20 ・ ・ ・ Reception circuit, 21 ・ ・ ・ Input disconnection detection circuit, 2
2, 28 ... Switching switch, 23 ... AND circuit, 2
4, 26 ... LED for display.

Claims (4)

[Claims] 1. A transmission line fault detection system for detecting a fault in a transmission cable having at least two optical signal lines, a power supply line and an earth line, and an output section connected to one end of the transmission cable. And a jig attached to the other end of the transmission cable so as to be freely connectable, wherein the output section transmits a light signal to the first optical signal line and a second optical signal line. Receiving means for receiving an optical signal from the power source, a power source for supplying a power supply voltage to the power source line, and the earth line connected to an earth potential when the receiving means receives the optical signal, Connection jig that opens the earth line when no signal is received; and the jig sends the optical signal from the first optical signal line back to the second optical signal line. Transmission line fault detection system for a folding sending means for, characterized in that comprises a first light emitting means connected between the power supply line and the earth line. 2. The transmission line fault detection system according to claim 1, wherein the jig has the return sending means and the first light emitting means housed in a predetermined housing. 3. The output section includes a second light emitting means and the second light emitting means, when the receiving means receives the optical signal and a predetermined voltage based on the power supply voltage is returned from the earth line. The transmission line fault detection system according to claim 1, further comprising a light emission control unit that causes the light emission unit to emit light. 4. The transmission cable is a transmission cable for connecting a camera unit having an image pickup means and a camera control unit for controlling the camera unit, wherein the camera control unit having the output unit is provided in the transmission cable. 2. The transmission line failure detection system according to claim 1, wherein the jig is connected to one end side of the transmission cable, and the jig is connected to the other end side of the transmission cable instead of the camera section.