JPH09189639A - System function test method in optical multiplex transmission system, and light switch for system function test - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute a system function test in optical multiplex transmission system in the state where the test result can be visually confirmed, and efficiently, safely and precisely execute the test. SOLUTION: The connection of a connecting optical cable E for connecting the transmission device C of an optical multiplex transmission system to a light distributing panel D to the transmission device C is attained by a light switch device 1 having ON/OFF function of light signal. Thus, the attachment and detachment of the light switch device 1 is performed in the vicinity of the transmission device C having a sufficient working space, and the light switch device 1 is situated near the transmission device C having a function of displaying a function test result, so that ON/OFF of the light signal in the light switch device 1 is surely attained by the physical interruption of the light signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a system function test including a test of a newly installed optical cable when an optical cable constituting a unit system is newly installed between a master station and a slave station of an optical multiplex transmission system. The present invention relates to a method performed for each unit system and an optical switch device used in this method.

[0002]

2. Description of the Related Art When a new optical cable is installed, a system function test for each unit system including a test of the newly installed optical cable between a master station and a slave station of an optical multiplex transmission system is performed by a worker on the master station side. The worker on the slave station side uses a different meeting line to proceed with the work while confirming both the lighting and switching of the lamp due to intermittent optical signals.

In the system function test in this optical multiplex transmission system, the interruption of the optical signal transmitted through the optical cable is caused by bending the connection optical cable connected between the transmission device of the station and the optical distribution board with a small radius of curvature. Optical loss (micro-bending loss) is given to the optical signal, and the optical attenuation state due to this optical loss is judged to be the "off" state, and the system function test is conducted.

This method of connecting and disconnecting an optical signal is dissatisfied with the fact that a dedicated electric device is required to bend the connecting optical cable to a certain small radius of curvature, so that the cost required for the test apparatus is high, and the connecting optical cable is also unsatisfactory. Since it was forcibly bent to a small radius of curvature until microbending loss occurred, there was a complaint that the core of the optical cable itself was damaged by the number of times of use and the passage of time.

As a means for eliminating this dissatisfaction, as shown in FIG. 9, the connection optical cable E to the optical distribution board D of the master station A and the slave station B is connected to the connection connector F of the connection optical cable E to the optical distribution board D. The method achieved by attaching and detaching is adopted.

According to this method, the connecting optical cable E itself is not damaged, but since the connecting connector F is detached and attached each time the test is performed, the connecting connector F itself may be damaged at an early stage. From the optical distribution board D, which is installed in a narrow place and to which a huge number of connection optical cables E are connected, to the connection connector F of the target connection optical cable E
Selecting and attaching / detaching is accompanied by excessive difficulty in the work, and the connection connector F of the other connection optical cable E is involved.
However, there is a problem in that a part of the operator's body is pressed against the connection optical cable E and the transmission system is damaged.

A connection optical cable E for the optical wiring board D
As a conventional technique for eliminating the inconvenience of the attachment / detachment means of the connection connector F, as shown in FIG. 10, a connection optical cable E connected to a transmission device C is passed through an optical switch body 1 ′ having an optical signal intermittent switching function. A means for connecting to the optical distribution board D has been considered.

In the prior art in which the optical signal is intermittently switched by the optical switch body 1 ', it is not necessary to attach / detach the connection connector F of the connection optical cable E each time the test is performed, so that the connection connector F is prevented from premature deterioration. In addition, the operation of the functional test is simplified because the interruption of the optical signal can be achieved by a simple switch operation.

[0009]

However, in the above-mentioned prior art, since the optical switch bodies 1'are attached to the optical wiring boards D dispersed in the office, the optical switch body 1 is attached. It is necessary to recognize the display of the transmission device C in order to confirm the lamp lighting, which is the test result associated with the operation of ', and for this reason, the person who operates the optical switch body 1',
Whether a person who confirms the lighting of the transmission device C lamp or the like is required, or the operator of the optical switch body 1'requires that the transmission device C
However, there was a problem that I had to move to check the lighting of the lamp.

Further, this optical switch body 1'is attached to an optical wiring board D.
In order to connect to the optical switch body 1 ', the target connection optical cable E is selected and extracted from the enormous number of connection optical cables E connected to the optical distribution board D, as in the prior art. Connector optical cable to optical distribution board D
However, this work has the same working environment, although the number of times of the attaching / detaching operation is reduced. Therefore, there is a problem that the inconvenience regarding the attachment / detachment of the cable to / from the optical distribution board D remains. It was

Further, since the intermittent switching of the optical signal by the optical switch body 1'is achieved only by the process of attaching and detaching the connector and the adapter in the optical switch body 1 ', the interruption of the optical signal is not always perfect. Therefore, there is a problem that it is difficult to judge the intermittent state of the optical signal.

Therefore, the present invention was devised to solve the above-mentioned problems in the prior art, and it is possible to perform a system function test in an optical multiplex transmission system in a state where the test result can be visually confirmed. Is a technical issue, and therefore functional testing can be performed efficiently,
In addition, the purpose is to be able to carry out this functional test safely and accurately in a good working environment.

[0013]

The first means of the present invention for solving the above technical problems is a transmission device in which functional units corresponding to a unit system of an optical multiplex transmission system are integrally assembled, and a unit system. It is a process in a station of an optical multiplex transmission system that is provided separately for each unit, and has a plurality of optical distribution boards that are distributed and arranged by connecting optical cables to corresponding functional portions of a transmission device. It is a process for a system function test, the connection of the connection optical cable to the transmission device is achieved through an optical switch device having an optical signal ON / OFF switching function, and the optical signal ON / OFF by this optical switch device is achieved. The system function test of the unit system is performed by switching off.

In the first means, the optical switch device may be provided only in the master station.

The second means of the present invention is to connect a connection optical cable connected to an optical distribution board and a corresponding functional portion of a transmission device in order to perform a system function test for each unit system of an optical multiplex transmission system. An optical switch device that is inserted and connected to the optical switch device, a connector optical cable that is connected to the transmission device, and an optical switch body to which the connection optical cable is connected. Each optical signal transmission line is connected to the optical switch body. Separately, a fixedly fixed switch adapter to which the connection optical cable is detachably connected, a switch connector that is connected to the connector optical cable and is detachably moved forward and backward with respect to the switch adapter, and a backward displacement state of this switch connector, It penetrates between the switch connector and the switch adapter to block the transmission of optical signals between them and In the forward mounting state with respect to data switch adapter, providing a switching unit having a light-shielding plate retracted from between the switch connector and switch adapter, in.

In the second means, a switch section is provided corresponding to the two optical signal transmission lines of the 0-system section and the two optical signal transmission lines of the 1-system section in the unit system of the optical multiplex transmission system. It is preferable to provide four combinations with connector optical cables in parallel.

In the second means, the switch connector of the switch section is assembled and fixed to a slider that linearly moves back and forth with respect to the switch adapter along a fixedly fixed rail, and the shading plate is provided near the slider. Fix the base end to the fixed piece fixed to the switch connector, move the tip part between the switch connector and the switch adapter in the backward displacement state of the switch connector, and move the switch connector and the switch adapter in the forward state of the switch connector. And the elastic plate is made of an elastic material for retracting the tip of the light shield plate, and the displacement of the tip part of the light shield plate is performed by elastic deformation of the light shield plate according to the displacement of the slider with which the light shield plate elastically contacts. It is valid.

In the structure in which the displacement of the tip portion of the light shielding plate is achieved by elastic deformation of the light shielding plate in accordance with the displacement of the slider, the slider portion on which the light shielding plate elastically contacts is erected and fixed to the slider. It is preferable to use a pin having a function.

In the second means, a long hole elongated along the moving direction of the switch connector is formed in the top plate portion of the case in which the switch portion of the optical switch body is built-in, which is directly above the portion that moves integrally with the switch connector. It is advantageous to construct a structure in which the distal end portion of the knob having the base end fixed to the portion that moves integrally with the switch connector is projected from this elongated hole.

[0020]

In the transmission device of the station, the functional parts such as the multiplexing circuit, the optical transmitter, the demultiplexing circuit, the optical receiver, the optical modulator, and the photoelectric conversion unit are integrally assembled for each unit system in the optical multiplex transmission system, Each unit system has a display function part such as a lamp for displaying the status of its function, and is installed on a dedicated floor with a sufficiently large work space for maintenance and management work.

The connection optical cable for connecting between the transmission device and the optical distribution board is connected to the transmission device through an optical switch device having an ON / OFF switching function of an optical signal during a system function test. The attachment / detachment of the optical cable and the optical switch device is performed for a transmission device having a sufficient working space around it.

Further, since the optical switch device is connected to the transmission device, it can be located near the transmission device, so that the operator of the optical switch device can directly obtain the operation result of the system function test. The display of the display function part of the transmission device can be visually confirmed.

The number of test items in the system function test of the unit system in the optical multiplex transmission system is much larger in the master station than in the slave station, and the number of test items in the slave station is small. The use of the optical switching device for the test may be applied only to the master station in some cases.

ON / OFF switching of an optical signal by the optical switch device is achieved by attaching / detaching a switch connector to which a connector optical cable of the optical switch main body is connected to a switch adapter to which a connecting optical cable of the optical switch main body is connected.

That is, the turning on of the optical signal is achieved without advancing unnecessary light from the outside by advancing the switch connector and attaching it to the switch adapter. The turning off of the optical signal is performed by the switch connector. Not only is it retracted and separated from the switch adapter, but the transmission of light between the switch connector and the switch adapter through this space is completely blocked in the space formed between this switch connector and the switch adapter. This is achieved by intruding the light shielding plate, so that a clear and reliable off-state of the optical signal can be obtained.

The combination of the switch part of the optical switch device and the connector optical cable is respectively corresponded to the four optical transmission lines of the system 0 part 2 and the system 1 part 2 in the unit system of the optical multiplex transmission system. When four are provided in parallel, all system function tests for the unit system can be continuously performed by one connection switching of the transmission device of the optical switch device and the connection optical cable.

[0027]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows a simplified block diagram of an optical multiplex transmission system in which the method of the present invention is applied to both a master station A and a slave station B. Both the master station A and the slave station B have a transmission device C and an optical distribution board D. And the connection optical cable E and the optical switch device 1.

The transmission device C is the heart of an optical multiplex transmission system for generating and transmitting an optical signal and converting the received optical signal into an electric signal. 1 system section, and both system sections are provided with a transmission terminal and a reception terminal, respectively.

The optical distribution board D distributed and arranged for each unit system of the transmission apparatus C has a 0-system section and a 1-system section corresponding to the unit system of the transmission apparatus C, and a master station A and a slave station B. It constitutes a connection function portion of the optical cable L for connecting the optical cable L and the optical fiber.

Connection optical cable E connected to the optical distribution board D
The optical switch device 1 for connecting to the transmission device C so as to be able to switch between ON and OFF includes two optical transmission lines of the 0-system part and two optical lines of the 1-system part in the unit system of the optical multiplex transmission system. It has four switch units 5 that individually perform switching operations corresponding to the respective transmission lines.

Therefore, when a system function test is performed on a unit system in which an optical cable L is newly installed and added, the optical switch device 1 is connected to the corresponding unit system of the transmission device C, and the optical switch device 1 performs the optical A system function test of this newly installed unit system is carried out by a signal on / off switching operation. In this system function test, since the optical switch device 1 is connected to the transmission device C, the optical switch device 1 is connected. It is possible to perform the system function test result by the switch switching operation while directly observing the display of the display function section of the transmission device C.

FIG. 2 shows a case where the optical switch device 1 is provided only in the master station A. In this case, the operation of switching on / off the optical signal in the slave station B is performed by, for example, the optical distribution board D.
This is achieved by attaching / detaching the connection optical cable E to / from.

FIGS. 3 to 8 show an embodiment of the optical switch device 1 of the present invention. An optical switch main body 2 to which a connecting optical cable E is connected and which is an on / off function part of an optical signal, This optical switch device 1 is composed of a connector optical cable 19 for connecting the optical switch body 2 to the transmission device C (see FIG. 3).
The connector 9 is connected to the transmission device C, and the plug frame 1
The connection connector F of the connection optical cable E is connected to 8 to achieve the attachment to the optical transmission line.

The connector optical cable 19 has the same connector as the connector F at the end of one optical cable line,
A switch adapter 20 to be attached to the optical switch body 2 is provided at the base end.

Optical switch body 2 (see FIGS. 4, 5 and 8)
Is a hollow rectangular parallelepiped case 3 on which a movable part of four switch parts 5 is arranged in parallel on the bottom plate 4 corresponding to the four optical transmission lines of the unit system of the transmission device C.
An adapter base 15 is provided on one side of the case 3 so as to face the movable part of each switch part 5 and to immobilize the switch adapter 20 of the connector optical cable 19 forming the fixed part of the switch part 5 in a fixed posture. The combination of the jack frame 17 and the plug frame 18 is attached to the other side of the switch frame 3, and the switch connector 16 provided at the other end of the optical cable line whose one end is connected to the jack of the jack frame 17 is provided with the switch section 5.
It is configured to be fixedly fixed to the movable part in a fixed posture.

The movable portion of the switch portion 5 (see FIGS. 6, 7 and 8) is assembled in a form straddling a rail 6 fixedly fixed on the bottom plate 4, and guided by the rail 6. On the slider 7 which moves back and forth, a connector base 9 for immobilizing the switch connector 16 in a fixed posture is fixed via a flat spacer 8 for adjusting the height, and the switch connector 16 is mounted on the connector base 9. Via the connector retainer 10 for immobilizing the
The spacer 8 which stands upright and is close to the front end face side of the connector base 9.
A pin 12, which is a spring pin, is erected on the upper surface of the slider 7, and a fixed piece 14 erected and fixed on the bottom plate 4 near the slider 7 is attached to the connector base 9 by the action of its own elasticity as the slider 7 moves forward and backward. Fixed switch connector 1
A light-shielding plate 13 made of an elastic material, which is made of an elastic material, is installed to enter and exit the front area of the switch 6 to intermittently transmit and receive the optical signal between the switch connector 16 and the switch adapter 20.

The fixed portion of the switch portion 5 is an adapter base 15 fixed to one side wall of the case 3 of the optical switch body 2.
And the switch adapter 20 of the connector optical cable 19 assembled and fixed to the adapter base 15 in a fixed posture, and each switch adapter 20 fixedly fixed.
Is the position and posture in which each switch connector 16 of the movable part of the facing switch part 5 becomes detachable by its forward / backward movement, that is, the central axis of the switch connector 16 along the forward / backward movement direction. It is fixedly attached and fixed in a position and posture that match with.

The light-shielding plate 13 of the switch section 5 has a fixed piece 14
Switch connector 1 facing each other near the base end fixed to
It is bent to the 6 side, and its tip is bent so as to easily enter the space formed between the switch connector 16 and the switch adapter 20, and is bent in the bending direction, that is, toward the opposite switch connector 16. The pin 12 is elastically contacted from the side in a state where an elastic force is applied in the direction.

Therefore, when the switch connector 16 is attached to the switch adapter 20, the light shield plate 13 is in the forward state.
Prior to the mounting of the switch connector 16 and the switch adapter 20, the pin 12 is forwardly displaced together with the slider 7 to which the switch connector 16 is fixed, and is pushed outwards against the resilience thereof, and the tip portion is switched. The space between the connector 16 and the switch adapter 20 is evacuated to the outside of the side, so that the mounting of the switch connector 16 and the switch adapter 20 is not hindered.

On the contrary, when the switch connector 16 is in the retracted state, the light shielding plate 13 is provided with the pin 1 integrated with the slider 7.
In accordance with the backward displacement of 2 and its own elasticity, the tip end is placed in the space between the formed switch connector 16 and the switch adapter 20 while slidingly contacting the pin 12, and the switch connector 16 and the switch adapter 20. It penetrates to the position where the transmission of the optical signal between and is completely cut off.

The movable part of the switch part 5, more specifically, the top plate part of the case 3 directly above the slider 7, extends along the moving direction of the movable part of the switch part 5 and at least the movable part of the switch part 5. Is a length that can be moved by a distance that requires a long hole 3 '(Fig. 3 and Fig. 5).
Is opened, and the tip of the knob 11 protruding from the elongated hole 3 ′ to the outside of the case 3 is operated with a fingertip to move the movable part of the switch part 5 forward and backward to displace the optical signal in the switch part 5. Perform intermittent operation.

The optical cable line connecting the switch connector 16 and the jack frame 17 is prevented from being subjected to unnecessary pulling and unreasonable bending as the switch connector 16 moves forward and backward. It is provided with a sufficient extra length (see FIG. 4).

[0043]

Since the present invention has the above-described structure, the following effects can be obtained. Connection to achieve the connection of multiple optical distribution boards to one transmission device, which is the main part of the optical multiplex transmission system. The connection of the optical cable to the transmission device is achieved through the optical switch device, so the optical signal transmission is performed during the system function test. The optical switch device that performs the on / off operation of the line can be located near the transmission device that has the function to display the function test results. This allows you to directly view the system function test results while operating the optical switch device. Therefore, it becomes extremely easy to carry out the system function test, and an accurate test result can be promptly and surely obtained.

The optical switch device, which is inserted and connected to the optical signal transmission line in order to perform the system function test, has a sufficient working space in the periphery and is directly connected to the transmission device in which each unit system is integrated. Therefore, the connection work can be performed in a good working environment, and the inconvenience of damaging the functional portion of the optical multiplex transmission system due to being caught during the work can be sufficiently suppressed.
Therefore, a good working environment can be obtained, and high safety of work can be obtained.

The disconnection of the optical signal transmission line in the optical switch device is "continuation" by mounting the switch connector and the switch adapter, and between the switch connector and the switch adapter when the switch connector and the switch adapter are separated from each other. This is achieved by "breaking" due to the intrusion of the light-shielding plate into the light-shielding plate, so that the system function test can be reliably and accurately performed, and thus the system function test can be reliably and accurately achieved.

The light-shielding plate of the optical switch device moves in and out between the switch connector and the switch adapter according to the forward / backward displacement of the switch connector due to its own elasticity, so the operation control of the light-shielding plate simply moves the switch connector forward / backward. The reliable operation of the optical signal transmission line is simple and easy.

[Brief description of the drawings]

FIG. 1 is an overall system schematic diagram showing an embodiment of the present invention.

FIG. 2 is an overall system schematic diagram showing another embodiment of the present invention.

FIG. 3 is an overall plan view showing an example of the optical switch device of the present invention.

4 is an overall plan view showing a structural example of an optical switch body of the optical switch device shown in FIG. 3 with a case broken.

5 is an overall side sectional view of the optical switch body shown in FIG.

6 is an overall side view showing a configuration example of a movable portion of a switch portion in the optical switch body shown in FIG.

7 is an overall front view of a movable portion of the switch portion shown in FIG.

8 is an enlarged plan view of a switch unit in the switch body shown in FIG.

FIG. 9 is a schematic diagram of an entire system used for explaining a conventional system function test.

FIG. 10 is an overall system schematic diagram for explaining a conventional system function test.

[Explanation of symbols]

 1; Optical switch device 1 '; Optical switch body 2; Optical switch body 3; Case 3'; Long hole 4; Bottom plate 5; Switch part 6; Rail 7; Slider 8; Spacer 9; Connector base 10; Connector retainer 11; Handle 12; Pin 13; Light-shielding plate 14; Fixing piece 15; Adapter base 16; Switch connector 17; Jack frame 18; Plug frame 19; Connector optical cable 20; Switch adapter A; Master station B; Slave station C; Transmission device D; Optical distribution board E; Connection optical cable F; Connection connector L; Optical cable

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiko Yamaguchi 7-6-3 Omorinishi, Ota-ku, Tokyo Sumitomo Opcom Co., Ltd. No. 31 Sumiden Opcom Co., Ltd.

Claims (7)

[Claims] 1. A transmission device (C) in which functional units corresponding to a unit system of an optical multiplex transmission system are integrally assembled,
Separately provided for each unit system, the transmission device (C)
In a station of an optical multiplex transmission system that has a plurality of optical distribution boards (D) that are connected by optical cables (E) and are distributed to the corresponding functional parts of the The connection of the optical cable (E) to the transmission device (C) is achieved through an optical switch device (1) having an optical signal on / off switching function, and the optical signal is turned on by the optical switch device (1). -A system function test method in an optical multiplex transmission system that performs a system function test of a unit system by switching it off. 2. The system function test method in an optical multiplex transmission system according to claim 1, wherein the optical switch device (1) is provided only in the master station (A). 3. Between the connection optical cable (E) connected to the optical distribution board (D) and the corresponding functional portion of the transmission device (C) in order to perform a system function test for each unit system of the optical multiplex transmission system. An optical switch device (1) inserted into and connected to a connector, which is connected to the transmission device (C).
(19) and an optical switch body (2) to which the connection optical cable (E) is connected, the optical switch body (2),
A fixedly fixed switch adapter to which the connection optical cable (E) is detachably connected for each optical signal transmission line.
(20), a switch connector (16) which is connected to the connector optical cable (19) and is detachably moved forward and backward with respect to the switch adapter (20), and when the switch connector (16) is in the backward displacement state, When the switch connector (16) is inserted between the switch adapter (20) and cuts off the transmission of an optical signal between them, the switch connector (16) is attached to the switch adapter (20) in the forward mounting state, Switch connector
Light shield that retracts from between (16) and switch adapter (20)
An optical switch device for system function test in an optical multiplex transmission system, which is provided with a switch section (5) having (13). 4. A switch section (5) and a connector optical cable corresponding to two optical signal transmission lines of a 0-system section and two optical signal transmission lines of a 1-system section in a unit system of an optical multiplex transmission system. 4. An optical switch device for system function test in an optical multiplex transmission system according to claim 3, wherein four combinations with (19) are provided in parallel. 5. The switch connector (16) of the switch part (5)
Is fixed to the slider (7) that moves forward and backward linearly with respect to the switch adapter (20) along the fixed rail (6), and the shading plate (13) is fixed to the slider (7). The base end is fixed to the fixing piece (14) fixed to the side of the switch connector (16), and the switch connector (16) is in the backward displacement state.
The tip end portion between the switch adapter (20) and the switch adapter (20) so that the tip end portion retracts from between the switch connector (16) and the switch adapter (20) while the switch connector (16) is in the forward movement state. A flat plate made of an elastic material, and the light shielding plate (13)
5. The optical multiplex transmission according to claim 3 or 4, wherein the displacement of the tip of the light shielding plate (13) is elastically deformed according to the displacement of the slider (7) with which the light shielding plate (13) is in elastic contact. Optical switch device for system function test in system. 6. The optical multiplex according to claim 5, wherein the portion of the slider (7) with which the light shielding plate (13) is in elastic contact is constituted by a pin (12) having a spring function, which is erected and fixed to the slider (7). Optical switch device for system function test in transmission system. 7. The switch connector (16) is provided on a top plate portion of a case (3) having a built-in switch portion (5) of an optical switch body (2), which is directly above a portion that moves integrally with the switch connector (16). ), A long hole (3 ') elongated along the moving direction is opened, and a knob (11) having a base end fixed to a portion integrally moving with the switch connector (16) from the long hole (3') is formed. 7. The optical switch device for system function test in the optical multiplex transmission system according to claim 3, 4 or 5 or 6, wherein the tip portion of (1) is projected.