JPS6177447A - Transmission line fault information system - Google Patents

Abstract

PURPOSE:To quicken diagnostic and repairing processing by transmitting the content of a fault and identification information to a subsequent communication controller together with a signal for supervising a transmission line generated newly when a fault is detected from the said transmission line supervisory signal. CONSTITUTION:If no frame F arrives from a transmission line 4-1 or an error takes place in the frame, an FL CHK detection section 22 detects an error and its content is transmitted to an ERR ADD generating section 26. The gener ating section 26 generates the fault information ERR based on the content of fault and transmits it to a CHK generating section 24 together with communi cation controller identification information ADD identifying the own communica tion controller. The generating section 24 generates the frame F based on a frame synchronizing flag FL, fault information ERR and identification ADD from an FL generating section 27 and transmits the frame to a transmission line 4-2 reaching the subsequent communication controller. A supervisory device receiving the frame F identifies the faulty part and content of error as the result of analysis of the fault information ERR and the identification information ADD and executes immediately a prescribed diagnosis and repair processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a transmission line failure notification system that enables easy detection of transmission line failures in a loop communication network.

As a means of communication between terminal devices or information processing devices (hereinafter collectively referred to as terminal devices), a loop-type communication network in which a plurality of communication control devices accommodating the terminal devices are connected in a loop through a transmission path is being widely adopted. be.

FIG. 3 is a diagram showing an example of this type of loop type communication network,
FIG. 4 is a diagram showing an example of the frame format used in FIG.

In FIG. 3, communication control devices 2 each accommodating a terminal device 1 and a monitoring device 3 that monitors and controls the entire loop-type communication network are connected in a loop through a transmission line 4. Each communication control device 2 processes communication between the terminal device 1 to which it belongs and the terminal device 1 belonging to another communication control device 2 under the control of the monitoring device 3 . Note that the communication direction of the transmission path 4 is one predetermined direction (for example, counterclockwise). The monitoring device 3 transmits a signal in the format shown in FIG.
), and controls the communication between the communication control devices 2], and also sends a frame F that circulates around the transmission path 4 and arrives.
The system monitors the normality of the loop transmission line by monitoring the system, and if an abnormality is detected, it attempts to determine the location of the failure and reconfigure the communication network in order to maintain communications. In FIG. 4, the frame synchronization flag FL is used by each communication control device 2 to determine the time domain of the frame F, and the frame synchronization flag FL is used by each communication control device 2 to determine the time domain of the frame F.
T is information to be transmitted to another communication control device 2 or monitoring device 3, and a frame check sequence CHK is used for error detection within frame F.

(Prior Art) FIG. 5 is a diagram showing an example of a conventional communication control device in this type of loop type communication network.

In FIG. 5, when a frame F arrives from the preceding communication control device 2 or monitoring device 3 via the transmission path 4-1, the receiving section 21 in the communication control device 2 receives the frame F, and the FL - It is transmitted to the CHK detection section 22 and the communication processing section 23. The FL/CHK detection unit 22 detects the frame synchronization flag FL from the received frame F, synchronizes the operation within its own communication control device 2 with the arrival time of the frame F, and detects errors within the frame based on the frame check sequence CHK. Inspect for the presence of. On the other hand, communication processing section 23
For example, branching of data D'F to be transmitted to the affiliated terminal device 1,
It inserts data DT to be sent from the affiliated terminal device (2), transfers data DT addressed to other communication control devices, etc., and transmits it to the CHK generation section 24.

The CHK generation unit 24 creates a frame J, CH, y-'7 sequence CHK to be attached to the data D 'I' and the frame 11 synchronization flag FL transmitted from the communication processing unit 23, and sets the frame J and the synchronization flag. It is sent to the transmission line 42 via the transmitter 25 in a predetermined time area together with FL and data DT.

Such a state -c': If the transmission path 4-1 ("p frame F no longer arrives" due to a transmission path failure or other reason,
Or j'h'? Error occurred in frame F1! ;For 1 case, l・” L -CI-I K detection unit 2
2 is the same frame as 1tJl flag 1. becomes undetectable, or an error is detected based on the frame check sequence CHK, and the detection result is recorded in the self++n f+'+ il;ll I output device 2.

However, communication +! LI! l! Part 2,'(, CHK generation part 2
4 and the transmitter 2 () are 1 m forward j, 1,174, -1
Since the frame synchronization flag FL that has arrived is transferred to the transmission path 42 without being reproduced in any way, any abnormality in the arrived frame F is transmitted to the communication control device 2 or the monitoring device 3 that is downstream.

On the other hand, the monitoring device 3 monitors the frame F transmitted via the transmission path 4, and if the frame F no longer arrives,
Alternatively, if an error occurs in frame F, it is determined that an abnormality has occurred in the loop communication network, but since it is impossible to identify the point where the failure has occurred, the connection is switched to each communication control device 2. Efforts are made to identify the location of the fault by following predetermined troubleshooting procedures, such as transmitting instructions such as changes to the system configuration.

[Problem that the invention seeks to solve]

As is clear from the above explanation, in a conventional communication control device, a monitoring device is used to transmit an abnormality in a frame transmitted from a preceding communication control device via a transmission path to a subsequent communication control device. 1. It is impossible to immediately determine the location of the failure. The only option is to identify the location of the fault based on a complicated fault handling procedure, which requires a long time to diagnose and repair, which may reduce the reliability of the loop communication network.

[Means for solving problems]

The problem is that in a loop communication network in which a plurality of communication control devices each accommodating a terminal device and a monitoring device that monitors and controls the entire system are connected in a loop through a transmission path, each of the communication control devices [ 1; When a fault is detected as a result of inspecting the signal for transmission line monitoring arriving from the j-th generation transmission line, fault information indicating the details of the detected fault, an identification report of the own communication control device, and the signal for monitoring the transmission line; This problem is solved by the present invention, which is characterized in that a signal is created and sent to the transmission path in a predetermined time domain, and transmitted to the monitoring device.

(Operation) In other words, according to the present invention, when each communication control device detects a fault from a transmission path monitoring signal arriving from a transmission path, each communication control device performs a newly created transmission process based on the details of the fault and the identification information of its own communication control device. Since the road monitoring signal is transmitted to the downstream communication control device, the monitoring device can immediately identify the communication control device that detected the fault and the details of the fault, and diagnosis and repair processing can be carried out quickly and accurately.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a communication control device according to one embodiment of the present invention, and FIG. 2 is a diagram showing an example of a frame format according to one embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures. The target loop communication network is as shown in Figure 3.

In FIG. 1, the receiving section 21 in FIG.
CHK detection section 22, communication processing section 23, CHK generation section 24
In addition to the transmitting section 25, an ERR/ADD generating section 26 and an FL generating section 7 are provided.

In FIG. 1, when a frame F as shown in FIG. 4 arrives from the preceding communication control device 2 or monitoring device 3 via the transmission path 4-1, the receiving unit 21 in the communication control device 2 receives the frame F is received and transmitted to the FL/CHK detection unit 22 and communication processing unit 23. The FL/CHK detection section 22 is
Detects the frame synchronization flag FL from the received frame F in the same way as described above, synchronizes the operation within its own communication control device 2 with the arrival time of frame F, and checks whether there is an error in frame F based on the frame check sequence CHK. do. If the frame F no longer arrives from the transmission path 4-1 due to a transmission path failure, or if an error occurs in the arrived frame F, the FL-CHK detection unit 22 sets the frame synchronization flag FL. becomes undetectable,
Alternatively, an error is detected based on the frame check sequence CHK, and the detected failure details are sent to the ERR-ADD generation unit 2.
6. The ERR-ADD generating section 26 is FL −
Based on the fault details transmitted from the CHK detection unit 22, the fault information $l! The CHK generation unit 24 creates the E
to communicate. - The force FL generator 27 creates a frame synchronization flag FL and transmits it to the CHK generator 24. The CHK generation unit 24 receives the frame synchronization flag FL transmitted from the FL generation generation unit 7, the failure information ERR transmitted from the ERR-ADD generation unit 26, and the internal information 11 of the communication control device 2.
Based on the ADD, an appropriate frame check sequence CHK is further added to create a frame F as shown in FIG. 2, and the frame F is sent to the transmission line 4-2 leading to the downstream communication control device 2 via the transmitter 25. Each downstream communication control device 2 receives the frame F sent by the communication control device 2 that detected the failure, processes it normally, and then transfers it to the downstream communication control device 2 or monitoring device 3 .

On the other hand, the monitoring device 3 monitors the frame F transmitted via the transmission path 4, and displays the failure information ERR and the communication system? ff1l device identification information AD
When D is detected, the communication control device 2 in which the fault has been detected is immediately identified based on the communication control device identification information ADD, and the details of the fault detected in the communication control device 2 are identified as a result of analysis of the fault information ERR. Based on the results, the monitoring device 3 immediately determines the location where the failure has occurred and the status of the failure, and performs accurate diagnosis and repair processing.

As is clear from the above description, according to this embodiment, the communication control device 2 detects that the frame F arriving from the preceding communication control device 2 cannot be received, or detects an abnormality in the received frame F. A frame F including information ERR and communication control device identification information ADD is created and transmitted to the monitoring device 3 via the downstream communication control device 2. The monitoring device 3 that has received the frame F analyzes the fault information ERR and the communication control device identification information ADD, identifies the fault location and fault content, and immediately performs predetermined diagnosis and repair processing. As a result, rapid and accurate diagnosis and repair processing can be performed.

Note that FIGS. 1 and 2 are only one embodiment of the present invention, and the configuration of the communication control device 2, for example, is not limited to that shown in the figures, and many other modifications may be considered. However, the effects of the present invention remain the same in either case. Further, the configuration of the frame F is not limited to that shown in the drawings, and many other modifications may be considered, but the effects of the present invention remain the same in any case. Furthermore, it goes without saying that the configuration of the loop communication network to which the present invention is applied is not limited to that shown in the drawings.

〔Effect of the invention〕

As described above, according to the present invention, in the loop communication network,
When a fault occurs in a transmission path, the monitoring device can quickly identify the location and details of the fault, making it possible to carry out accurate diagnosis and repair processing, thereby improving the reliability of the loop communication network.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a communication control device according to an embodiment of the invention, FIG. 2 is a diagram illustrating an example of a frame format according to an embodiment of the invention, and FIG. 3 is a diagram illustrating an example of a loop type communication network. , FIG. 4 is a diagram showing an example of the frame format used in FIG. 3, and FIG. 5 is a diagram showing an example of a conventional communication control device. In the figure, ■ is a terminal device, 2 is a communication control device, 3 is a monitoring device, 4 is a transmission path, 21 is a receiving section, 22 is a FL-CH
K detection unit, 23 is a communication processing unit, 24 is a CHK generation unit, 2
5 is a transmitter, 26 is an ERR/AD+) generator, 27
is FL generation unit, ADD is communication control device identification information, CHK
is frame check sequence, DT is data, ERR
indicates failure information, F indicates frame, and FL indicates frame synchronization flag. No. 1 No. 2 Fig. 3 Fig. 4 Fig. Da

Claims (1)

[Claims] In a loop communication network in which a plurality of communication control devices each accommodating a terminal device and a monitoring device that monitors and controls the entire system are connected in a loop through a transmission path, each of the communication control devices arrives from the transmission path. If a fault is detected as a result of inspecting the signal for transmission path monitoring, fault information indicating the details of the detected fault, identification information of the own communication control device, and the signal for monitoring the transmission path are created for a predetermined period of time. 1. A transmission path failure notification system, characterized in that the transmission path failure notification method is transmitted to the transmission path in an area and transmitted to the monitoring device.