JPH0548584A - Optical communication system - Google Patents

Abstract

PURPOSE:To automatically and quickly execute the recovery of a line terminal unit from failure. CONSTITUTION:This optical communication system makes monitor control section 6 monitor line terminals 2A, when one of the line terminals 2A fails, switches optical switch 5A at this line terminal 2A in failure to bypass a data signal to be output from spare line terminal 4 to optical transmission channel 110 at the failure side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical communication system capable of relieving a failure of a line terminating device.

[0002]

2. Description of the Related Art FIG. 12 is a block diagram showing a conventional optical communication system. In the figure, reference numeral 1 is an electric signal multiplex converter, and 2A is n lines for transmitting and receiving data to and from the electric signal multiplex converter 1. Termination device, 3 is this line termination device 2A
A line termination unit in which n sets are mounted, 101 is a time-division multiplexed data signal, 102 is a data signal separated for each line termination device, and 103 is obtained by signal processing the data signal 102 in the line termination unit 3. And 110 is an optical transmission line for outputting each optical signal.

Next, the operation will be described. The data signal 101 input to the electrical signal multiplex converter 1 is separated into a plurality of data signals 102 here, and transmitted to the corresponding line terminators 2A. Each line terminating device 2A converts each data signal into an optical signal 103 and transmits this to the subscriber via the optical transmission line 110. On the other hand, the data transmitted from the subscriber side is transmitted through the optical transmission line 110, the line terminating unit 3 and the electrical signal multiplex converting unit 1 in the reverse order. In this case, when a failure occurs in any of the line terminating devices 2A, an operator manually replaces the defective line terminating device 2A with a normal one.

[0004]

Since the conventional optical communication system is constructed as described above, the line terminating device 2A is used.
If any of the above fails, the worker must go to the failed part to perform maintenance work in order to replace it with a normal line terminator, and it takes time to restore it. However, there was a problem that it could not be relieved in an instant.

The invention of claim 1 has been made to solve the above problems, and provides an optical communication system capable of automatically repairing a failure of a line terminating device and immediately after the occurrence of the failure. The purpose is to get.

Another object of the invention of claim 2 is to obtain an optical communication system capable of promptly repairing the failure by switching the line terminating device which has failed due to the use of the optical rotary switch to the spare line terminating device. To do.

[0007]

The optical communication system according to the invention of claim 1 is interposed in the middle of each optical transmission line,
An optical switch having two input terminals and two output terminals, which are cascade-connected to each other via an optical signal line, and a backup line terminating device arranged in parallel with the line terminating device are provided, and the monitoring control unit is provided with the above. The line terminating equipment is monitored, and when any of the line terminating equipments fails, the optical switch on the side of the faulty line terminating equipment is changed over so that the data signal output from the standby line terminating equipment is transferred to the optical signal line. By way of this, a bypass output is made to the optical transmission line on the fault side.

Further, in the optical communication system according to the invention of claim 2, a spare line terminating device provided in parallel with the line terminating device and the line terminating device which is interposed in the middle of the optical transmission line and is broken are replaced. And an optical rotary switch for connecting the spare line terminating device to the optical transmission line that has been connected to the faulty line terminating device.
The failure of the line terminating device is monitored, and when the failure occurs, the motor for switching the connection by the optical rotary switch is controlled.

[0009]

According to the optical switch of the invention of claim 1, according to the judgment result of which one of the line terminators has failed,
The supervisory control unit switches and disconnects the faulty line termination device, automatically connects the standby circuit termination device to the optical transmission line on the fault target side, and immediately outputs the data signal of the fault target unit as an optical signal. It can be so.

In the optical rotary switch according to the invention of claim 2, the motor driven by the control output from the supervisory control unit replaces the failed line terminating device with the spare circuit terminating device on the failure target side. By connecting to the optical transmission line, the optical signal can be continuously transmitted through the optical transmission line.

[0011]

EXAMPLES Example 1. An embodiment of the invention of claim 1 will be described below with reference to the drawings. In FIG. 1, 1 is an electrical signal multiplex converter, 2A is n line terminators for transmitting and receiving data to and from the electrical signal multiplex converter 1, 3 is a line terminator in which n sets of this line terminator 2A are mounted. , 101 is a time-division multiplexed data signal, 102 is a data signal separated for each line termination device, 103 is an optical signal obtained by signal processing the data signal 102 in the line termination unit 3, and 110 is each optical signal. Is an optical transmission line for outputting

Further, 4 is a backup line terminating device, 5A is n four-terminal optical switches connected to the line terminating devices 2A and 4, respectively, 6 is a line terminating unit 3 is monitored, and each optical switch 5A and an electrical signal are multiplexed. A supervisory control unit that controls the conversion unit 1, 104 is a spare data signal line that connects the electric signal multiplex conversion unit 1 and the protection line termination device 4, 105 is a control signal that is transmitted to the electric signal multiplex conversion unit 1, and 106 is an optical signal. A control signal transmitted to the switch 5A, and 107 is an optical signal line connecting between the optical switches 5A.

Next, the operation will be described. First, the data signal 101 input to the electrical signal multiplex converter 1 is separated into a plurality of data signals 102 here, and transmitted to the corresponding line terminators 2A. Each of these line termination devices 2A converts each data signal into an optical signal 103,
This is transmitted to the subscriber via the optical transmission line 110. On the other hand, the data transmitted from the subscriber side is transmitted through the optical transmission line 110, the line terminating unit 3 and the electrical signal multiplex converting unit 1 in the reverse order.

Next, in the above operation, when the line terminating unit 3 fails, the monitor control unit 6 operates according to the flowchart of FIG. That is, the monitor control unit 6 has n
The failure of each line termination device 2A is monitored (step ST
1) The presence / absence of a failure is checked (step ST2), and if there is a failure, it is determined whether or not there is one or two or more failed line termination devices 2A (step ST).
3). If it is determined that the number is one, the protection line terminating device 4 is switched to the data line (step ST
4) Further, the optical switch 5A is switched (step ST5).

That is, in step ST5, the switching signal of the optical switch 5A of the faulty line terminating device 2A is transmitted, and in step ST4 the electrical signal multiplexing is performed so as to switch the data line to the spare data signal line 104 of the spare line terminating device 4. A control signal is sent to the converter 1. Also, step S
If it is determined that there are two or more failures at T3, an emergency relief request is sent to the system maintenance person and only one is relieved (step ST6).

Next, of the line terminators 2A, for example, 3
The operation of the multi-continuous optical switch 5A when the th line terminating device 2A fails will be described with reference to FIG. First, before a failure occurs, a path connecting a terminal connected to the optical transmission line 110 and a terminal 3b connected to the third line termination device 2A, a terminal 3c of the second optical switch and a terminal 3d of the fourth optical switch are connected. A path to be connected is established, and a series of paths including the paths 3c and 3d between the optical switches is one optical transmission path connected to the protection line terminating device 4.

Now, if the third line terminating device 2 fails, the path between the terminals 3a and 3b and between the terminals 4a and 4b is cut under the control of the supervisory control unit 6, and as shown in FIG. , 3d are newly created. As a result, the third line terminating device 2A is disconnected, and the monitoring control unit 6 supplies the data signal to be connected to the third line terminating device 2A to the connected standby line terminating device 4
Optical terminals and terminals 3b, 3 of the third optical switch 5A
It is output to the optical transmission line 110 via a.

Example 2. In the above-mentioned embodiment, the case where the number of the line terminating devices 2A is n and the case where the one line terminating device 4 is provided are shown. However, when the number of the line terminating devices 2A is increased by four, for example, FIG. As shown, by adding one spare line terminating device 7 and four new optical switches 5B, the line terminating device 2A that has been further expanded can be sufficiently repaired.

Example 3. In addition, the optical signal line 107 that continuously connects the n optical switches 5A can be freely removed,
The n optical switches 5A may be divided into blocks and connected to a plurality of units and the line terminating device 2A for repair.

Example 4. Further, although the optical switch 5A is provided outside the line terminating unit 3 in the above embodiment,
As shown in FIG. 6, if the optical switch 5A is installed in the line terminating unit 3, there is an effect that the structure of the line terminating device can be simplified and the assembling work can be facilitated.

Embodiment 5. FIG. 7 is a block diagram showing an embodiment of the invention of claim 2, 1 is an electric signal multiplex conversion unit, 2A is an n number of line termination devices for transmitting and receiving data to and from the electric signal multiplex conversion unit 1, 3 is this line termination device 2A
N is a line terminating unit, 101 is a time-division multiplexed data signal, 102 is a data signal separated for each line terminating device 2A, and 103 is a data signal 102 obtained by signal processing in the line terminating unit 3. The optical signals 110, 110 are optical transmission lines for outputting the optical signals, and 4 is a protection line terminating device.

Reference numeral 10 denotes optical transmission lines 8 and 9 extending from n line terminating devices 2A and protection line terminating device 4,
An optical rotary switch 11 for connecting the optical transmission line 110 on the subscriber side, a monitor control unit 11 for monitoring the line terminators 2A, 4 and a control unit 105, 106 for controlling the optical rotary switch 10 and the electrical signal multiplex conversion unit 1. This is a control signal supplied from the monitoring controller 11 to the electrical signal multiplex converter 1 and the optical rotary switch 10.

FIG. 8 is a front view showing a part of the details of the rotary switch 10 and FIG. 9 and FIG. 10 are left and right side views thereof, in which the line terminating devices 2A are shown in the case of six. 9 is the above-mentioned optical transmission line for temporary relief connected to the backup line termination unit 4, 8 is the above-mentioned optical transmission line connected to the n line termination devices 2A, and 110 is n optical transmission lines connected to the subscriber side. Reference numeral 11 is an outer ring rotating pair in which only one optical transmission path 9 is connected, and 12 is an inner ring shaft in which n optical transmission paths 8 are connected.

Further, 13 is n small rotating bodies to which n optical transmission lines 110 are connected, and 14 is the small rotating body 1.
3 is a stopper for easily stopping at a fixed position, 15 is a motor for rotating the outer ring rotating body 11, 16 is a motor 15
Gears for transmitting the power of the power through the pinion 15A,
Reference numeral 17 denotes a motor fixed to the inner ring shaft 12 for rotating the small rotating body 13, and n motors are provided. Reference numeral 18 is a condenser lens. The optical transmission lines 8, 9 and 10 are connected to the optical rotary switch 10 by an optical terminal 19.

Next, the operation will be described. This claim 2
In the invention described above, one of the optical transmission lines 8 of the line terminating device 2A that has failed due to the optical rotary switch 10 and one of the optical transmission lines 110 on the subscriber side are separated, and the optical transmission line 9 for temporary relief is provided.
The optical transmission line 110 is connected to.

That is, this operation is performed by the monitor control unit 11
Is executed as follows. First, the outer ring rotating body 11 is controlled by the motor 15 to connect the optical transmission line 9 to any one optical transmission line 8 to which the broken line terminating device 2A is connected.
It is moved as shown in FIG. 9 so that it is right above.

Next, the optical transmission line 1 on the subscriber side, which is connected to the optical transmission line 8 corresponding to the faulty line terminating device 2A.
The small rotating body 13 having 10 rotates under the control of the motor 17, and the optical transmission path 9 and the optical transmission path 110 of the outer ring rotating body 11 are connected.

That is, as shown in FIG. 10, the small rotating body 13 rotates and the position of the optical transmission line 110 moves to the dotted circle P. When such movement of the outer ring rotating body 11 and rotation of the small rotating body 13 are simultaneously performed, the protection line terminating device 4 is replaced with the defective line terminating device 2A, and the data signal from the electric signal multiplex converter 1 is transferred to the protection line terminating device. It can be sent to the subscriber side via the device 4, and the repair processing for the failure of the circuit termination portion is completed.

Example 6. It should be noted that in the fifth embodiment, one optical rotary switch 10 is provided for each spare line termination device 4.
However, as shown in FIG. 11, the protection line terminating device 4A is added to the optical rotary switch 10A.
May be serially connected to the first optical rotary switch 10 and the optical transmission line 9A of the additional protection line terminator 4A may be connected. As a result, even if two line termination devices 2A fail at the same time, these can be relieved.

[0030]

As described above, according to the first aspect of the present invention, the supervisory control unit is caused to monitor the line terminating device, and when any of the line terminating devices fails, the faulty line terminating device side By switching the optical switch and by-passing the data signal output from the protection line terminating device to the transmission line on the above-mentioned failure side via the optical signal line, maintenance work at the time of failure can be performed by the operator. There is an effect that it can be automatically and quickly carried out without bothering hands, and can realize efficient and reliable failure relief of the line termination section.

According to the second aspect of the present invention, the monitoring control unit interposed in the middle of the optical transmission line is caused to monitor the failure of the line terminating device, and when the failure occurs, the optical rotary switch is used for reconnection. Since the drive motor is configured to be controlled, this motor replaces the faulty line terminating device with the backup circuit terminating device and connects it to the optical transmission line on the faulty side, and then continues the optical signal through the optical transmission line. There is an effect that what can continue the transmission of is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an optical communication system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of circuit operation in FIG.

FIG. 3 is a conceptual diagram showing a configuration of the optical switch in FIG.

FIG. 4 is a conceptual diagram showing an operating state of the optical switch in FIG.

FIG. 5 is a block diagram showing an optical communication system according to another embodiment of the present invention.

FIG. 6 is a block diagram of a main part showing another example of installation of the optical switch in FIG.

FIG. 7 is a block diagram showing an optical communication system according to an embodiment of the present invention.

8 is a front view showing a part of a specific structure of the optical rotary switch 4 in FIG.

9 is a left side view showing the optical rotary switch in FIG.

10 is a right side view showing the optical rotary switch in FIG.

FIG. 11 is a block diagram showing an optical communication system according to another embodiment of the invention of claim 2;

FIG. 12 is a block diagram showing a conventional optical communication system.

[Explanation of symbols]

 1 Electrical Signal Multiplexing / Conversion Unit 2A Line Termination Device 4 Backup Line Termination Device 5A Optical Switch 6 Monitoring Control Unit 10 Optical Rotary Switch 11 Monitoring Control Unit 15, 17 Motor 107 Optical Signal Line 110 Optical Transmission Line

Claims (2)

[Claims] 1. An electric signal multiplex conversion unit for separating an input data signal into a plurality of data signals, and each data signal separated by the electric signal multiplex conversion unit is converted into an optical signal, and a subscriber side In an optical communication system provided with a line terminating device for transmitting separately to an optical transmission line, interposed in the middle of each of the optical transmission lines, and cascaded to each other via an optical signal line,
An optical switch having two input terminals and two output terminals, a backup line terminating device installed in parallel with the line terminating device, and the line terminating device are monitored, and when any of the line terminating devices fails, By switching the optical switch on the side of the faulty line terminating device, the data signal output from the standby line terminating device is bypassed to the optical transmission line on the faulty side via the cascaded optical signal line. An optical communication system comprising a monitoring control unit. 2. An electric signal multiplex conversion section for separating an input data signal into a plurality of data signals, and each data signal separated by the electric signal multiplex conversion section is converted into an optical signal, and the subscriber side In an optical communication system provided with a line terminating device for individually transmitting to an optical transmission line, a backup line terminating device arranged in parallel with the line terminating device and the line that has failed due to being interposed in the middle of the optical transmission line In place of the terminating device, the spare line terminating device is connected to the optical transmission line that has been connected to the faulty line terminating device, and the optical rotary switch is connected to the optical transmission line. An optical communication system, characterized in that a monitoring control unit for controlling a motor for reconnection by the optical rotary switch is provided at times.