JPS61227446A - Fault information transmission system - Google Patents

Abstract

PURPOSE:To allow all nodes in a loop communication network to recognize a fault generated on a transmission line by providing a maintenance time slot representing the fault of transmission line in a digital signal. CONSTITUTION:The received fault information is compared with a node number fixed register 40 by comparators 32-1, 32-2, and when they are coincident, they are coincident into all '0' by inhibition circuits 33-1, 33-2. When the reception fault is detected by reception fault detection circuits 35-3, 35-2, it is used as the reception fault information to send the own node number, and when not detected, the output of the circuits 33-1, 33-2 is used as it is as the reception fault information to be sent. The transmission fault information is given to a respective selection circuit 38-1 or 38-2, when the reception fault in the opposite direction is detected, only the corresponding bit is brought to '0' and when not detected, the bit is brought into '0', the other bits pass through inhibition circuits 39-1, 39-2 as they are, subject to multiplex by multiplex circuits 37-1, 37-2 together with the reception fault information to be sent and the result is sent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a fault information transmission system in a loop communication network.

[Prior art]

Traditionally, in digital communication systems, well-known transmission path failures include reception failures such as input interruptions and frame synchronization loss, and functional failures to notify the opposite station of such reception failures. There is a transmission failure that occurs when receiving a game alert. These failure information.

Defined between adjacent nodes of communication devices connected by a transmission path, when a transmission path failure occurs.

The reception failure or transmission failure can be recognized by the nodes at both ends.

[Problem that the invention seeks to solve]

Therefore, in a communication network in which at least three or more nodes are connected in a loop, for example, in order to recover from a line disconnection due to a transmission path failure.

When reaccommodating lines from one node, which is a control station, by controlling another node, which is a controlled station, it is necessary for the control station to correctly recognize the fault location in the transmission path of the loop communication network. . However, the above reception failure and transmission failure alone have the disadvantage that only the nodes at both ends of the transmission line where the failure has occurred can recognize the transmission line failure.

[Purpose of the invention]

The object of the present invention is to eliminate the above-mentioned conventional drawbacks.

It is an object of the present invention to provide a fault information transmission method that allows not only the nodes at both ends of the transmission line but also all nodes in a loop communication network to recognize a fault that has occurred in a transmission line.

[Structure of the invention]

The failure information transmission system according to the present invention is applied to a bidirectional loop-shaped communication network having at least three nodes, and a control station device that is placed in each node and multiplexes and transmits reception failure information and transmission failure information. means for receiving failure information in each direction and separating the failure information into reception failure information and transmission failure information; and providing reception failure information separated by the separation means in common in both directions. a first detection means for comparing the output of the nine node number fixed storage means and detecting whether or not there is a match; and when the first detection means detects a match, the reception fault information is a second detection means for detecting the presence or absence of a reception failure at its own node;
When a reception failure is detected by the detection means, the reception failure information generation means sets the number of the own node as the reception failure information to be transmitted, and if not detected, the reception failure information generating means uses the output of the conversion means as the reception failure information as it is; After receiving the transmission failure information separated by the separation means, if a reception failure is detected by the second detection means in the opposite direction, the corresponding node number is set as transmission failure information, and if no failure is detected, no failure information is used. year,
A transmission failure information generation means for allowing numbers that do not correspond to the node number to pass through as is, and a multiplexing means for multiplexing and transmitting the output of the reception failure information generation means and the output of the transmission failure information generation means. It is characterized by

[Embodiments of the invention]

Next, an embodiment of the present invention will be described with reference to a drawing.

FIG. 2 is a system diagram showing an example of a loop-shaped communication network to which the present invention is applied. In this example, the number of nodes is 6.
The case is shown below. now.

Assuming that only the transmission path from node 2 to node 3 has a failure, node 3 can detect the reception failure. Now, in this loop-shaped communication network, in the digital signals sent to each of all the transmission paths, there is a maintenance time slot indicating a transmission path failure as shown in Fig. 3.
m+n bits), and reception failure information is assigned to the first half l pits, and transmission failure information is assigned to the second half n bits. Here, 1m is the number of bits that can convert the number of applicable nodes in the loop + 1 into a binary number.

n is the total number of nodes. Therefore, in the assumed transmission path failure as described above, node 3 converts the reception failure detection node number 1131+ into a binary number and transmits the reception failure information in the direction of node 4. On the other hand, node 3 sends failure information in the direction of node 2 to the third pit corresponding to node 3! 1111 (II □ II indicates that there is no transmission failure) and transmits.

In other words, generally speaking, regarding reception failure information,
If a reception failure is detected, the node number is used as new reception failure information, and if no reception failure is detected, the received reception failure information is transmitted in the opposite direction (that is, in the same direction). However, if the received reception failure information matches the node number, it is set to the all II□IJ state (no reception failure in that direction). On the other hand, regarding transmission failure information, if a reception failure in the opposite direction is detected, the corresponding bit position is
If it is not detected, it is set as If □ II, and the bits that do not correspond to that node are transmitted as they are.

FIG. 1 is a block diagram showing the configuration of a control station device arranged at each node as an embodiment of the present invention. In this figure, fault information received from nine directions is separated into reception fault information and transmission fault information by separation circuits 31-1 and 31-2. Among them, each reception failure information is compared with the output of the node number fixed register 40 by each comparator 32-1 and 32-2, and if they match, the prohibition circuits 33-1 and 33-2 select all II □
Converted to II. The reception failure is detected by the reception failure detection circuit 35.
-1 and 35-2, the number of the own node should be sent as reception failure information; if not detected, the output of the prohibition circuits 33-1 and 33-2 should be sent as is. This is reception failure information.

On the other hand, the transmission failure information separated by the nine separation circuits 31-1 and 31-2 is transmitted to the respective selection circuits 38-1 and 38.
-2, if a reception failure in the reverse direction is detected, only the corresponding bit is set to "111", and if it is not detected, II
OI+, and other bits are prohibited circuit 3 as is.
Pass 9-1 and 39-2.

The multiplexing circuit 37- along with the reception failure information to be transmitted.
1 and 37-2 and is multiplexed and transmitted.

〔Effect of the invention〕

As is clear from the above explanation, according to the failure information transmission method of the third invention, even if simultaneous failures occur in the upstream and downstream transmission lines between any adjacent nodes, it is possible for all nodes to recognize the failure. Of course, even if failures occur simultaneously on all transmission lines in both directions, they can be recognized by all nodes, and recognition of other failure patterns is much easier than with conventional methods. such as becoming
When applied to a bidirectional loop communication network, the effect of improving the failure recognition rate is great.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment according to the present invention;
FIG. 2 is a system diagram showing an example of a loop-shaped communication network to which the present invention is applied, and FIG. 6 is a diagram showing an example of a time slot configuration for failure information used in the present invention. In the figure, 1 to 6 are nodes, 31-1.31-2 is a separation circuit, 32-1.32-2 is a comparator, 33-1
゜33-2 is a prohibition circuit, and 34-1.34-2 is a selection circuit. 35-1.35-2 is a reception failure detection circuit; 36-1.
36-2 is a pulse generation circuit, 37-1.37-2 is a multiplexing circuit, 3B-1, 38-2 is a selection circuit, 39-
1.39-2 is an inhibition circuit, and 40 is a node number fixed register.

Claims (1)

[Claims] 1. In a control station device that is applied to a bidirectional loop-shaped communication network having at least three nodes and is placed in each node and multiplexes reception failure information and transmission failure information and transmits and receives the same, , means for receiving fault information and separating the fault information into reception fault information and transmission fault information, and node number fixed storage means provided commonly in both directions for storing the reception fault information separated by the separation means. a first detection means for comparing the output with the output of the first detection means to detect whether or not there is a match between the two, and means for converting the reception failure information into information of a state in which there is no failure when a match is detected by the first detection means. and a second detection means for detecting the presence or absence of a reception failure in the own node, and when the reception failure is detected by the second detection means, the number of the own node is set as the reception failure information to be transmitted, and the detected If not, a reception failure information generation means that directly uses the output of the conversion means as reception failure information, and a reception failure is detected by the second detection means in the opposite direction, each receiving the transmission failure information separated by the separation means. If the node number is detected, the corresponding node number is used as transmission failure information, and if it is not detected, it is treated as non-fault information, and numbers that do not correspond to the node number are passed through as is; A failure information transmission system comprising: multiplexing means for multiplexing and transmitting an output and an output of the transmission failure information generating means.