JPH04220818A - Locating system for faulted section of line - Google Patents

Abstract

PURPOSE:To locate a fault without giving hindrance to a currently used line in the case of locating faulted section of a line at fault. CONSTITUTION:A 1st transmitter 1 and a 2nd transmitter 3 are arranged opposite to each other via a transmission line 2. The system is provided with a 1st measurement device 35 monitoring the output of an active device of the 2nd transmitter 3, an amplifier 41 amplifying the monitor signal of a reception data up to a main signal level at the connection terminal of transmission line of the 2nd transmitter 3, non-operating devices 42, 43 having the similar function to the active device of the 1st transmitter and a 2nd measurement device 45 monitoring the output of the non-operating devices 42, 43. Then a fault is located in response to the result of the measurement by the 1st and 2nd measurement devices 35, 45.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for isolating a faulty section in a faulty line.

0002

2. Description of the Related Art FIG. 2 is a diagram showing a first configuration example of a conventional communication system, and FIG. 3 is a diagram showing a second configuration example of a conventional communication system. In FIG. 2, 21 is a first optical transmission device that converts an electrical signal into an optical signal, 22 is a second optical transmission device that converts an optical signal into an electrical signal, and 23 is the first optical transmission device 21. Second optical transmission device 2
This is, for example, an optical transmission line that connects the two. In the figure, an electrical signal from a first other device is subjected to electrical-to-optical signal conversion in a first optical transmission device 21, and the optical signal is transmitted to a second optical transmission device 22 via an optical transmission line 23, Electrical-optical signal conversion is performed again in the second optical transmission device 22, and the electrical signal is then sent to a second other device. In this case, to determine whether the first optical transmission device 21 is normal or not, the first optical transmission device 21 is separated from the optical transmission line 23 by turning back at point A at the exit of the first optical transmission device 21. , and transmission line 2
The optical transmission line 23 is
The first optical transmission device 21 including the first optical transmission device 21 is separated from the second optical transmission device 22, and the fault is isolated using either of these methods. Similarly, to determine whether the second optical transmission device 22 is normal or not, the second optical transmission device 22 is separated from the optical transmission line 23 by turning back at point B or point A, or The first optical transmission device 21 including the first optical transmission device 21 is separated. Fault isolation using this method cannot be achieved without disconnecting the line in operation.

In FIG. 3, 21 and 22 are a first optical transmission device and a second optical transmission device that share the working system and the protection system, and 23a is the first transmission line of the working system, and 23b is the protection system. It is a second transmission line, and 24 and 25 are a first changeover switch and a second changeover switch for switching the first optical transmission device 21 and the second optical transmission device 22 from the active system to the protection system, and conversely from the protection system to the active system. In the figure, the electrical signal from the first other device is normally sent to the first optical transmission device 21 via the working system of the first changeover switch 24, and electrical-optical signal conversion is performed. Afterwards, this optical signal passes through the active system of the first optical transmission device 21 and the first transmission line 23a and reaches the second optical transmission device 22.
transmitted to. Note that the second optical transmission device 22 converts the received optical signal into an electrical signal, and then the electrical signal passes through the active system of the second optical transmission device 22 and the second changeover switch 25 to a second other. sent to the device. In this case, for example, if a failure occurs in the first optical transmission device 21, a first switching signal is sent from the first optical transmission device 21 to the first changeover switch 24 and the second changeover switch 25 to switch from the active system to the backup system. Switch. Therefore, the signal from the first other device is the first changeover switch 2.
4 and the backup system of the first optical transmission device 21, and the second transmission line 2
3b, passes through the backup system of the second optical transmission device 22 and the second changeover switch 25, and is sent to a second other device. Note that even if a failure occurs in the second optical transmission device 22, switching is similarly performed using the second switching signal. Note that when fault isolation is performed using this method, a momentary disconnection of the line occurs at the time of switching.

0004

[Problem to be Solved by the Invention] Therefore, conventional fault isolation methods cannot be used without disconnecting the line in operation.
Alternatively, there is a problem that momentary line interruption occurs during switching. SUMMARY OF THE INVENTION An object of the present invention is to provide a fault section isolation method that makes it possible to isolate a fault section without causing any trouble to the working line.

[0005]

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a certain first transmission device 1 is connected via a transmission path 2.
and a certain other second transmission device 3 facing each other, a first measuring device 35 for monitoring the output of the active device of the second transmission device 3, and a transmission line connection end of the second transmission device 3. an amplifier 41 for amplifying a monitor signal of received data to the main signal level; and a non-operating device 4 connected to the output of the amplifier 41 and having a function equivalent to the active device of the first transmission device 1.
2, 43 and a second measuring device 45 that monitors the output from the non-operating devices 42, 43, and isolates the fault section according to the measurement results of the first and second measuring devices 35, 45. Configure to enable.

[0006]

[Operation] In the present invention, as shown in FIG. 1, the output of the working line to be transmitted is monitored by the first measuring device 35 on the side of the second transmission device 3 forming the working line system; The monitor signal is amplified in an amplifier 41, and the amplified output is added to a research line equivalent to the working line system, and the obtained result is monitored by a second measuring device 45.

[0007] Therefore, by monitoring the first measuring device 35 and the second measuring device 45, fault sections can be isolated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the configuration of a communication system according to the present invention. In the figure, 1 is a first transmission device for electrical-optical signal conversion;
Reference numeral 2 denotes a transmission line for transmitting optical signals, and reference numeral 3 denotes a second transmission device, which is formed from a working line system and a research line system, and converts the received optical signal into an electrical signal and sends it out.

In FIG. 1, processing of electrical-to-optical signal conversion of a signal from a first other device is performed in a first transmission device 1, and this converted optical signal is sent to a second transmission device via a transmission line 2. 3 and received by the transmission/reception device 31. The transmission/reception device 31 performs optical-to-electrical conversion of the received signal, and the main signal is sent from the first signal path 34 to the working line system, and the monitor signal is sent from the monitor terminal 311 to the investigation line system.

The main signal received via the first signal path 34 is separated into three parts in the first multiplexer 32. The first multiplex converter 32 is a signal receiving board 32 that separates the received signal into three parts.
a to 32c are built in, and one of the electrical signals separated into three is transmitted from the signal receiving board 32a to the second multiplex converter 33 via the first signal path 34. The second multiplex converter 33 has built-in signal receiving boards 33a to 33e that separate the received signal into five parts and send out each of them.
One of the five separated electrical signals is transmitted from the signal receiving board 33a to a second external device. At the same time, the output of the signal receiving board 33a is picked up from the monitor terminal 331, and the picked up output is applied to the first measuring device 35 to monitor errors in the working line.

On the other hand, the monitor terminal 31 of the transmission/reception device 31
1 is amplified to the main signal level by an amplifier 41, and then sent via a second signal path 44 to a first non-operational device 42 forming a survey line system. Note that in this case, the investigation line system is formed in the same way as the working line system. The first non-operational device 42 includes signal receiving panels 42a to 4.
2c is built-in, the signal received by the first non-operational device 42 is separated into three, and one of the three separated signals is sent from the signal receiving board 42a to the second non-operational device 43 on a second signal path 44.
to be transmitted via. Note that the second non-operational device 43 includes a signal receiving board 4 that separates the received monitor signal into five parts and sends out each of them.
3a to 43e are built in, and one of the separated signals is transmitted from the signal receiving board 43a to a third external device. At the same time, the output of the signal receiving board 43a is picked up from the monitor terminal 431, and the picked up output is applied to the second measuring device 45 to monitor the investigation line error.

As described above, as a result of error monitoring by the first measuring device 35 and the second measuring device 45, ■ In the investigation line and the working line----transmission line 2
If an error is detected by the first transmission device 1 including the fault ■ If the error is detected only on the working line --- If the error is detected by the second transmission device 3 ■ If the error is detected only on the investigation line --- The second It can be determined that the failure occurred due to transmission equipment 3.

[0013]

[Effects of the Invention] As is clear from the above explanation, according to the present invention, it is possible to isolate a faulty section without causing any trouble to the working line, and furthermore, it is possible to isolate the faulty section without causing any trouble to the working line, and furthermore, it is possible to isolate the faulty section without causing any trouble to the working line. Even in the event of a failure, long-term monitoring can be achieved without disrupting the working line.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a communication system of the present invention.

FIG. 2 is a diagram showing a first configuration example of a conventional communication system.

FIG. 3 is a diagram showing a second configuration example of a conventional communication system.

[Explanation of symbols]

1 is the first transmission device 2 is the transmission line 3 is the second transmission device 35 is the first measuring device 41 is an amplifier 42 is the first non-operational device 43 is the second non-operational device 45 is the second measuring device

Claims (1)

[Claims] [Claim 1] In a line in which a certain first transmission device (1) and a certain other second transmission device (3) are arranged facing each other via a transmission path (2), the second transmission device (3) a first measuring device (35) that monitors the output of the current device; and an amplifier (41) that amplifies the monitor signal of the received data to the main signal level at the transmission line connection end of the second transmission device (3).
), and a non-operational device (4
2, 43) and a second measuring device (45) that monitors the output from the non-operating device (42, 43), and according to the measurement results of the first and second measuring device (35, 45). A system for isolating a faulty section of a line, characterized in that it is possible to isolate a faulty section.