JPH09214457A - System for evaluating fault of repeater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily evaluate a repeater in which fault is detected without manag ing respective repreaters by previously adding. ID or the like to them by making the numeric value of ID to be '0' and transmitting it with a fault state in the repeater in which the fault is detected, and adding a specified number value to received ID and transmitting it in the repeater repeating ID and the fault state. SOLUTION: In this repeater fault evaluating system, a photoelectric conversion part 1, an F1 byte insertion part 2, a photoelectric conversion part 3, a transfer bit identification part 4, an ID generation part 5, a fault detection part 6, an alarm generation part 7 and an F1 byte transfer part 8 are provided. In the repeater detecting the fault, the numeric value of ID is set to be '0', and it is transmitted with the fault state. In the repeater repeating ID and the fault state, '1' is added to the numeric value of received ID and it is transmitted. Thus, a terminal station can locate the fault state received with ID to be the fault state of the repeater installed before by adding the numeric value '1' to the numeric value shown in ID.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to S which has detected a failure.
A DH (Synchronous Digital Hierarchy) repeater is specified based on an ID (identification number) for identifying the repeater from a plurality of repeaters installed between terminal stations, and particularly to a repeater failure evaluation method, and in particular, each repeater The present invention relates to a repeater failure evaluation method that can easily evaluate a repeater that has detected a failure without managing an ID for each.

An SDH repeater receives an STM (Synchronous Transport Module) -N optical signal generated at an SDH multiplexing terminal station, reproduces it, and then transmits it again as an STM-N optical signal. In addition, the SDH repeater can identify the repeater that has detected a failure in order to respond to the existing maintenance action when the downstream end station or the repeater detects a failure. ITU-T Recommendation (G.783 Appendix I)
It has the F1 byte function based on.

The F1 byte is 8 bytes as shown in FIG.
It has a bit configuration, and a 2-bit failure status (00: normal,
01: Major Error, 10: Receiver alarm, 11: Er
rorMonitor), 5 bits of ID (00 to 1F)
h). Therefore, the F1 byte in the normal state has the code “00000000”.

[0004]

2. Description of the Related Art Conventionally, in a repeater failure evaluation method of this kind, there is a technique which can easily and easily identify a failure occurrence point in a repeater transmission line, for example, as disclosed in Japanese Patent Laid-Open No. Sho 62-62.
-78935. In this scheme,
An unused code is uniquely assigned to each repeater in the transmission line code system, and when an input interruption is detected in each repeater, the code previously assigned to this repeater is sent to the posterior side. doing.

Next, with reference to FIG. 5, an example realized based on this technique will be specifically described. As shown, the repeater includes a photoelectric conversion unit 1, an F1 byte insertion unit 2,
It has an electro-optical conversion unit 3, a transfer bit identification unit 4, a failure detection unit 6, an own ID generation unit 81, an alarm generation unit 82, and an F1 byte transfer unit 83. In addition, the self-ID generating unit 81 is registered with the IDs given in advance to the repeaters.

The photoelectric conversion unit 1 receives a transmitted optical signal and converts it into an electric signal. The F1 byte insertion unit 2 inserts the F1 byte received from the F1 byte transfer unit 83 at a predetermined position of the signal to be transmitted and outputs the F1 byte to the electro-optical conversion unit 3. The electro-optical conversion unit 3 converts the output of the F1 byte insertion unit 2 into an optical signal and outputs it. The transfer bit identification unit 4 identifies the F1 byte received by the photoelectric conversion unit 1 and sends it to the F1 byte transfer unit 83. The failure detection unit 6 detects a failure in this section when an abnormality is recognized by receiving a transmission code from the photoelectric conversion unit 1, and also detects a failure of the repeater itself and outputs it to the alarm generation unit 82.

When the alarm generation unit 82 receives the notification of the failure state from the failure detection unit 6, it generates a bit code to be inserted into the failure state area of the F1 byte according to the failure state and sends it to the F1 byte transfer unit 83. . When the F1 byte transfer unit 83 receives the F1 byte from the transfer bit identification unit 4, the alarm generation unit 8
When there is no notification of a failure state from 2, the transfer bit identification unit 4
While the F1 bit received in step 1 is transferred as it is, when the alarm generation unit 82 notifies the failure state, the bit code of the failure state and the ID given to itself obtained from the self ID generation unit 81 are predetermined. F1 byte formed at the position is F
It is sent to the 1-byte insertion unit 2.

A conventional repeater failure evaluation method will be described with reference to FIGS. 5 to 7. FIG. 6 is a flowchart showing an example of the main operation procedure according to FIG.
FIG. 9 is an explanatory diagram showing an example of the generation state of the F1 byte transmitted from the terminal station 90 to the terminal station 94 via the three repeaters 91 to 93.

First, as shown in FIG. 6, when the transfer bit identification unit 4 identifies the F1 byte (step S21), if there is no failure detection and no alarm from the alarm generation unit 82 (NO in step S22). ), The F1 byte transfer unit 83 transfers the F1 byte received from the transfer bit identification unit 4 to the F1 byte insertion unit 2 (step S23), and the F1 byte insertion unit 2 sends out the transferred F1 byte (step S24). .

Therefore, if everything is normal, FIG. 7 (A)
As shown in, the failure state "00" and the ID "0"
0 "is as it is from the originating terminal station 90 to the repeaters 91 to 93.
And arrives at the receiving side terminal station 94. Here, the IDs “01 to 03” are given to the relays 91 to 93 in advance and registered in the own ID generation unit 81.

When the above step S22 is "YES" and the own repeater detects a failure, for example, as shown in FIG. 7B, there is a failure between the originating terminal station 90 and the repeater 91. If the failure detection unit 6 detects this, the F1 byte transfer unit 83 sends a failure state (for example) from the alarm generation unit 82.
Since "10" is received, I's I
D, take out the ID “01” of the repeater 91, set the failure state “10” and the ID “01” (step S2
5), the F1 byte is formed (step S26), and the step S
23, the formed F1 byte is inserted into the F1 byte insertion part 2
To the repeater 92.

Since the repeaters 92 and 93 have not detected any failure, the received F1 byte is directly transferred to the succeeding place as described above. As a result, the terminal station 94 on the receiving side receives the failure state "10" and the ID "01" in the F1 byte.
The repeater 91 assigned with the ID “01” has a failure state “1”.
You can know that it is 0 ”.

[0013]

In the above-mentioned conventional repeater failure evaluation method, the former publication discloses that the unused code is a code of the transmission path coding method and is uniquely assigned to each repeater.
When input disconnection is detected in each of the repeaters, a code pre-assigned to this repeater is sent to the rear side. In the latter example, the ID uniquely assigned to each repeater is previously set. When a failure is detected in the relay device provided, the own ID previously given to the F1 byte is inserted and sent to the rear side. As a result, it is necessary to assign a code or ID to each relay in advance and set it, and at least manage the code or ID of the relay between the terminal stations and which code or ID indicates which relay. There is a problem.

An object of the present invention is to provide a repeater failure evaluation system which can easily evaluate a repeater in which a failure is detected without assigning an ID or the like to each repeater in advance and managing it.

[0015]

According to a repeater failure evaluation method of the present invention, a plurality of SDH repeaters in which a failure is detected are installed between terminal stations based on an ID (identification number) for identifying the repeater. In the repeater failure evaluation method of identifying from the repeater, the repeater that detects a failure sends the ID and the failure status by setting the numerical value to “0”, and the repeater that relays the ID and the failure status receives the ID. Is sent with the numerical value "1" added. As a result, the terminal station can evaluate the fault condition received together with the ID as the fault condition of the repeater installed just before adding the numerical value "1" to the numerical value indicated by the ID.

Further, one specific repeater is a failure detection unit for detecting a failure and a ITU-T recommendation (G.783 Ap.
Pendix I) A transfer bit identification unit for identifying a failure state and an ID from a transfer bit of a transmission format having an F1 byte function, and a numerical value of the received F1 byte ID when no failure is detected by the failure detection unit. An ID generation unit that adds "1" to form an F1 byte and an alarm generation that replaces the ID with a numerical value "0" and forms an F1 byte when a failure is detected by the failure detection unit. Section, an F1 byte transfer section that receives and transfers one of the F1 bytes of the ID generation section and the alarm generation section, and an F1 byte received from this F1 byte transfer section,
It has an F1 byte inserting section which inserts it at a predetermined position and sends it to the succeeding position.

[0017]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a functional block diagram showing an embodiment of the present invention. In the repeater failure evaluation method shown in FIG. 1, the photoelectric conversion unit 1, the F1 byte insertion unit 2, the electro-optical conversion unit 3, the transfer bit identification unit 4, the ID generation unit 5, the failure detection unit 6, the alarm generation unit 7, And an F1 byte transfer unit 8 is provided.

This configuration is different from the conventional one in that its own ID
Instead of the generation part, the ID generation part 5 is added,
That is, a new ID is generated for the received F1 byte, a new F1 byte is formed by the F1 byte transfer unit 8, and is transmitted.

The photoelectric converter 1 receives the transmitted optical signal and converts it into an electric signal. The F1 byte insertion unit 2 receives the F1 byte received from the F1 byte transfer unit 8 at a predetermined position of the signal to be transmitted.
One byte is inserted and output to the electro-optical conversion unit 3. The electro-optical conversion unit 3 converts the output of the F1 byte insertion unit 2 into an optical signal and outputs it.

The transfer bit identification unit 4 identifies the F1 byte received by the photoelectric conversion unit 1 and sends it to the ID generation unit 5. The ID generation unit 5 generates a new ID by adding a numerical value “1” to the received ID in the F1 byte received from the transfer bit identification unit 4 and replaces it, and sends it to the F1 byte transfer unit 8. I shall. . However, when the ID generation unit 5 receives the alarm generation notification from the alarm generation unit 7, the ID generation unit 5 stops outputting the ID.

The failure detection unit 6 detects an abnormality in the transmission code received from the photoelectric conversion unit 1 to recognize a failure in this section, and also detects a failure of the repeater itself and outputs it to the alarm generation unit 7. The alarm generation unit 7 converts the detected and recognized failure state into a corresponding code and converts the ID into a numerical value “0” to form an F1 byte and sends the F1 byte to the F1 byte transfer unit 8 and also to the ID generation unit 5. The ID transmission shall be stopped.

The F1 byte transfer unit 8 transfers the F1 byte received from either the ID generation unit 5 or the alarm generation unit 7 to the F1 byte insertion unit 2.

Next, the main procedure and function of the repeater failure evaluation system will be described with reference to FIG. 1 and FIGS. 2 is a flow chart showing one form of the main operation procedure in FIG. 1, and FIG.
FIG. 6 is an explanatory diagram showing an example of a generation state of F1 bytes transmitted to the terminal station 14 via 3;

First, as shown in FIG. 2, the transfer bit identification unit 4 identifies the F1 byte (step S1), and then I
After identifying D (step S2), the F1 byte is sent to the ID generation unit 5. When there is no failure detected in the relay device and no alarm notification is issued from the alarm generation unit 7 (NO in step S3), the ID generation unit 5 adds the numerical value “1” to the received ID value to generate a new ID. To form the F1 byte (step S
4), F1 byte insertion unit 2 through F1 byte transfer unit 8
The F1 byte is sent to the rear side (procedure S
5).

Therefore, if everything is normal, FIG.
As shown in (3), the failure state "00" remains as it is from the originating side terminal station 10 to the receiving side terminal station 14 through the repeaters 11 to 13. However, the ID "00" is assigned to the repeater 11
~ 13 each time passing through ID "01" ~ ID
Change to "03". Therefore, in the receiving side terminal 14 of the transmission line having three repeaters, the failure state "00"
And ID “03” is input.

On the other hand, when the above step S3 is "YES" and the self-relay device detects a failure, for example, as shown in FIG. 3 (B), a failure state exists between the relay device 11 and the relay device 12. If there is a failure of "10", the failure detection unit 6 of the repeater 12 detects this and the alarm generation unit 7 sets the failure status "10" and the ID "00" and sets the F1 byte. It is formed (procedure S6) and is sent to the F1 byte transfer unit 8 and the procedure proceeds to the procedure S5. As described above, the F1 byte is transferred from the F1 byte transfer unit 8 to the F1 byte insertion unit 2, inserted into a predetermined position by the F1 byte insertion unit 2, and sent to the rear side.

In this case, the repeater 13 is, as described above,
The ID "01" is inserted instead. As a result, the terminal 14 on the receiving side inputs the failure status “10” and the ID “01” as the F1 byte, and therefore the received numerical value “0”.
It can be immediately evaluated that the position of the numerical value "2" obtained by adding the numerical value "1" to the value "1", that is, the relay device 12 two before is the failure detection relay device.

In the above description, the transmission of the optical signal has been described, but another signal may be used. Moreover, although it has been described that the ID is transmitted by the F1 byte function, another transmission method may be applied and a predetermined bit position of a specific byte may be used.

Further, in the above description, the function deployment is illustrated and described, but the distribution such as the separation / merging of the functions is free, and the above description does not limit the present invention.

[0031]

As described above, according to the present invention, the repeater which detects a failure sends the ID and the failure status to the failure status while setting the ID of the F1 byte to "0" and sends it together with the failure status. Sends the received ID by adding the numerical value "1". With this configuration, each repeater
Different IDs to rate the repeater that detected the failure
Since it is not required to be given and set in advance, it is possible to obtain a repeater failure evaluation method that does not require management of the repeater and that can easily evaluate the repeater that has detected a failure.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing one embodiment of a main operation procedure according to FIG. 1;

FIG. 3 is an explanatory diagram showing an example of an ID generation state according to FIGS. 1 and 2.

FIG. 4 is a format diagram showing one form of bit arrangement of F1 byte.

FIG. 5 is a functional block diagram showing an example of the related art.

6 is a flowchart showing one form of a main operation procedure according to FIG.

FIG. 7 is an explanatory diagram showing an example of an ID generation state according to FIGS. 5 and 6;

[Explanation of symbols]

 1 photoelectric conversion unit 2 F1 byte insertion unit 3 electric light conversion unit 4 transfer bit identification unit 5 ID generation unit 6 failure detection unit 7 alarm generation unit 8 F1 byte transfer unit

Claims (3)

[Claims] 1. An SDH (Synchronous Dielectric) that detects a failure.
gital Hierarchy) ID to identify the repeater
In a repeater failure evaluation method that specifies from a plurality of repeaters installed between terminal stations based on (identification number), the repeater that has detected a failure sets the ID to a numerical value "0" and sends it together with the failure state. On the other hand, a repeater failure evaluation method characterized in that a repeater for relaying the ID and the failure state adds the numerical value "1" to the received ID and sends it. 2. A repeater failure evaluation method, wherein an SDH repeater in which a failure is detected is specified from a plurality of repeaters installed between terminal stations based on an ID (identification number) for identifying the repeater. The terminal station reports the failure status received with the ID to I
A repeater failure evaluation method characterized by evaluating the repeater installed before the addition of the value "1" to the value shown in D. 3. A repeater failure evaluation method, wherein an SDH repeater in which a failure is detected is identified from a plurality of repeaters installed between terminal stations based on an ID (identification number) for identifying the repeater. The detector has a failure detection unit for detecting a failure and an IT.
If a failure is not detected by the transfer bit identification unit that identifies the failure state and the ID from the transfer bit of the transmission format having the F1 byte function based on the UT recommendation (G.783 Appendix I), and if the failure detection unit does not detect the failure, the received When a failure is detected by the ID generation unit that forms the F1 byte by adding the numerical value “1” to the numerical value of the ID of the F1 byte and the failure detection unit, replaces the ID with the numerical value “0” together with the detected failure state. An F1 byte transfer unit that receives and transfers one of the ID generation unit and the alarm generation unit, and an F1 byte received from this F1 byte transfer unit. A repeater failure evaluation method, comprising: an F1 byte insertion unit that inserts the data at a position and sends the data to a subsequent position.