JPH06268614A - Relay transmission device - Google Patents

Abstract

(57) [Abstract] [Purpose] Regarding a relay transmission device for specifying a failure occurrence section between relay devices, an AIS transmitted from each relay device.
The purpose is to specify the faulty section by sequentially adding “+1” to the code and identifying the count value on the terminal side. [Configuration] First terminal station 1A and second terminal station that perform transmission or reception
In the case where data relay is performed between the first terminal relay device 2A and the intermediate relay device 3 and between the relay devices of the second terminal relay device 2B between 1B, when the data relay is performed, When a failure is detected at the preceding stage in each of the relay device 3 and the second terminal relay device 2B, "+1" is added to the AIS code sent by each relay device after the occurrence of the failure and "1" is added. The section 10 is provided, and the terminal side on the receiving side is configured to identify the faulty section by identifying the AIS code transmitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay transmission device for specifying a faulty section between relay devices.

[0002] In a device that performs relay transmission, it is required to be promptly restored when a failure occurs. Therefore, it is necessary to quickly find the faulty section when a fault occurs.

[0003]

2. Description of the Related Art The prior art will be described below with reference to FIG. FIG. 4 is a diagram showing the configuration of a conventional example circuit.

In FIG. 4, 1A and 1B are first terminal station and second terminal station, 2A and 2B are first terminal station repeater and second terminal station repeater, and 3A, 3B and 3C are first station. The first intermediate relay device, the second intermediate relay device, and the third intermediate relay device.

Reference numeral 21 is an A code addition section for adding an A code to the transmitted alarm display signal (AIS) code, 22 is a B code addition section for adding a B code to the AIS code, and 23 Is a C code adding section for adding a C code to the AIS code.

[0006] For example, when transmitting data from the second terminal station 1B to the first terminal station 1A, the second terminal station relay device 2B on the transmitting side is the second terminal station 1B.
The analog signal sent from the terminal station 1B is converted into a digital signal, the digital signal is placed on a transmission frame formed in a predetermined format, and the third intermediate relay device 3C
Pass to.

When a failure is detected in the third intermediate relay device 3C, the C code adding section 23 places the set C code as an AIS code at a predetermined position on the transmission frame and relays data to the second intermediate relay device 3B. To do.

Similarly, when a failure is detected in the second intermediate relay device 3B, the B code adding section 22 places the set B code as an AIS code at a predetermined position on the transmission frame and the first intermediate relay device 3A. Relay data to.

Further, when a failure is detected in the first intermediate relay device 3A, the A code adding section 21 puts the set A code as an AIS code at a predetermined position on the transmission frame, and the first terminal relay device 2A. Relay data to.

Then, the first terminal repeater 2A on the receiving side is
The received data which is decomposed into the received frame and the A code, the A code, the B code, and the C code as the AIS code are extracted, and the received data is converted from a digital signal to an analog signal. As for B code and C code, the first terminal 1A
Pass to.

Finally, the first terminal station 1A receives the data and identifies the faulty section by the A code, B code and C code.

[0012]

Therefore, in the data relay technology of the conventional example, a separate A is provided for each intermediate relay device.
There is a problem that it takes time to set the IS code.

The present invention is based on the AI transmitted from each relay device.
The purpose is to specify the fault occurrence section by identifying the count value on the terminal side by sequentially adding “+1” to the S code.

[0014]

In order to achieve the above object, as shown in FIG. 1, a first terminal station for transmitting or receiving data.
In the case where data relaying is performed between the first terminal relay device 2A, the intermediate relay device 3 and the relay devices of the second terminal relay device 2B between the first terminal relay device 1A and the second terminal station 1B, the above-mentioned first terminal is used. When a failure is detected at the preceding stage of each of the station repeater 2A, the intermediate repeater 3 and the second terminal repeater 2B, "+1" is added to the AIS code sent by each repeater after the occurrence of the failure. An additional '1' addition unit 10 is provided, and the receiving side terminal station side is configured to identify the faulty section by identifying the transmitted AIS code.

[0015]

The present invention, as shown in FIG. 1, includes a first terminal relay device 2A, an intermediate relay device 3 and a second terminal provided between a second terminal station 1B and a first terminal station 1A which perform transmission or reception. When a '1' addition unit 10 is provided in each of the station relay devices 2B and a failure is detected in any of the first terminal station relay device 2A, the intermediate relay device 3A and the second terminal station relay device 2B, first The relay device after the relay device that detected the failure in the AIS code to be sent is "+1".
Is added to send to the next stage.

Therefore, in the receiving side, for example, the second terminal station 1B,
By identifying the count value of the received AIS code, it is possible to easily specify the fault occurrence section, so that the fault can be quickly recovered.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS.
2 is a diagram showing the configuration of an embodiment circuit of the present invention, and FIG. 3 is a processing flow of the AIS code in FIG.

In FIG. 2, reference numeral 10 is a "1" addition section showing the structure of the present invention, and "+" is added to the transmitted AIS code.
1'is added. Further, 1A and 1B are the first terminal station and the second terminal station, 2A and 2B are the first terminal station relay device and the second terminal station relay device, and 3A, 3B, 3C are the first intermediate relay device and the second terminal station. The intermediate relay device and the third intermediate relay device. In FIG. 2, the same symbols as in FIG. 4 (prior art) have the same configuration and function.

Further, in FIG. 3, S ** (for example, S31)
Represents the processing step number. In the following, the second terminal station
It is assumed that data is transmitted from 1B to the first terminal station 1A.

During normal operation without any failure in the relay transmission system, the second terminal relay device 2B, the third intermediate relay device 3C, the second intermediate relay device 3B, the first intermediate relay device 3A, and the first terminal relay device apparatus
The '1' addition unit 10 provided in 2A does not function, and each relay device outputs the AIS code '00' sent from the former stage to the latter stage as it is (S31).

Now, when a failure occurs between the second intermediate relay device 3B and the first intermediate relay device 3A (S32), the AIS received by the "1" addition unit 10 of the first intermediate relay device 3A.
"+1" is added to the code "00", and the first intermediate relay device 3A transmits the AIS code "01" to the first terminal relay device 2A (S33).

Next, the '1' addition section of the first terminal repeater 2A
"+1" is added to the AIS code "00" received in 10 to become the AIS code "02" (S34).
The code '02' is transmitted to the first terminal station 1A.

Then, in the first terminal station 1A, the first intermediate relay device 3A and the second intermediate relay device 3B from the AIS code '02'.
It is recognized that a failure has occurred in the interval (between the relay devices two stages before) (S36).

Based on the above operation, the first intermediate relay device 3A
And the second intermediate relay device 3B is restored (S37).

[0025]

As is apparent from the above description, according to the present invention, it becomes unnecessary to set an AIS code in each relay device, and it is possible to specify a fault occurrence section for a fault occurrence.
This has an effect of greatly contributing to shortening the recovery time for a failure.

[Brief description of drawings]

FIG. 1 is a diagram showing a circuit of a principle configuration of the present invention.

FIG. 2 is a diagram showing a configuration of an embodiment circuit of the present invention.

FIG. 3 is a diagram showing a processing flow of an AIS code in FIG.

FIG. 4 is a diagram showing a configuration of a conventional example circuit.

[Explanation of symbols]

 1A is the first terminal station 1B is the second terminal station 2A is the first terminal station relay device 2B is the second terminal station relay device 3 is an intermediate relay device

Claims (1)

[Claims] 1. A first terminal station relay device (2A) and an intermediate relay device between a first terminal station (1A) and a second terminal station (1B) that perform transmission or reception.
(3) and the relay device of the second terminal station relay device (2B) are provided to perform data relay, the first terminal station relay device (2A), the intermediate relay device (3) and the second terminal device are provided. When a failure is detected on the upstream side of each of the station repeaters (2B), a "1" addition unit (10) that adds "+1" to the AIS code sent by each repeater after the occurrence of the failure
The relay transmission device is characterized in that the failure occurrence section is specified by identifying the transmitted AIS code on the receiving side terminal station side.