JP2606585B2 - Ring network system and node information collection method in ring network system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring network system having a plurality of nodes. The invention also relates to a method for collecting node information signals from a plurality of nodes at each node.

[0002]

2. Description of the Related Art Various ring network systems having a plurality of nodes connected in a ring via a communication path (for example, an optical path) have been proposed (for example, Japanese Patent Application Laid-Open No. SHO 64-16146 and Japanese Patent Application Laid-Open No. Sho 16-16146). Kaikai 64-89636
Reference). In the ring network systems described in these documents, communication between nodes is performed by using a token or performing a polling operation. Such communication is performed by one-way communication or two-way communication.

[0003] Further, the ring network system is used for a SONET (shynchronous optical network) transmission system.

[0004]

In a ring network system, when information is transmitted from a transmitting node, communication between nodes is performed by designating one or a plurality of destination nodes. When collecting information transmitted from each of the plurality of nodes to a specific node among the plurality of nodes, the information includes one or more of the following: passing information from each of the plurality of nodes to a specific node; Often it has to be transmitted via an intermediate node.

[0005] In SONET systems, failures often occur somewhere in the communication path, and failures must be located by an administrator by checking state information at the nodes one by one. Checking and locating such a fault is troublesome, laborious, and time-consuming, since the administrator must go to the location of the node and check whether each node is normal. there were.

Accordingly, an object of the present invention is to provide a ring network system which makes it easy for an administrator to monitor an alarm.

Another object of the present invention is to easily locate a fault in a ring network system and to save labor, cost and time required to check all nodes included in the ring network system. It is to provide a method.

It is still another object of the present invention to provide a method in which alarm monitoring at all nodes included in a ring network system can be performed by watching only one node.

[0009]

Here, if the supervisor can know all the node information signals of the plurality of nodes at each of the plurality of nodes, the labor and time of the manager can be effectively saved. .

In the present invention, taking this into consideration, the node information signals of all nodes are collected at each node.

That is, according to the present invention, in a ring network system in which a plurality of nodes are connected in a ring, each of the plurality of nodes generates a node information signal indicating a state of the own node; A node information signal memory having a plurality of node information storage areas corresponding to the nodes; and a node information signal indicating the state of the own node, the node information signal being stored in the node information signal memory of the own node. Means for storing information in the node information storage area corresponding to the above; communication of storage data of the entire node information signal memory only with both adjacent nodes, and node information in the own node based on the storage data of both adjacent nodes; The storage of the node information signal of the other node in the node information storage area corresponding to the other node of the signal memory is performed within the own node. Ring network system is obtained, characterized by having: means repeated until the node information signals of all other nodes in the node information signal memory is stored.

Further, according to the present invention, in a method for collecting a node information signal of a plurality of nodes in each of a plurality of nodes used in a ring network system in which a plurality of nodes are connected in a ring shape, Preparing, at each of the plurality of nodes, a node information signal memory having a plurality of node information storage areas corresponding to the nodes; at each of the plurality of nodes, transmitting a node information signal representing the state of the own node; Storing in a node information storage area corresponding to the own node among the plurality of node information storage areas of the plurality of node information signal memories; and in each of the plurality of nodes, only adjacent two nodes and the node information signal memory The entire storage data is communicated, and the node information signal in the own node is determined based on the storage data of both adjacent nodes. Repeating storing the node information signal of the other node in the node information storage area corresponding to the other node of the memory until the node information signals of all the other nodes are stored in the node information signal memory in the own node; A method for collecting node information in a ring network system characterized by having;

[0013]

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

Referring to FIG. 1, a ring network system according to one embodiment of the present invention is a SONET.
/ Synchronous digital hierarchy
An ierarchy (SDH) ring system is described below. In the illustrated example, the present ring network system has first to fifth nodes 10A to 10E connected to each other via a communication path 5. Each of the first to fifth nodes 10A to 10E can perform bidirectional communication along the communication path 5 by a known method. Communication path 5
Is actually composed of an optical path divided into an optical path for clockwise communication CW and an optical path for counterclockwise communication CCW.

Each of the first to fifth nodes 10A to 10E has the same structure and performs the same operation, and periodically performs bidirectional notification along a clockwise communication path and a counterclockwise communication path. Shall be. It is assumed that the notification is a node information signal indicating the state of each node. First to fifth nodes 1
Each of 0A to 10E has a node information signal memory or table (described later) for storing a node information signal.

Referring to FIG. 2, the first to fifth nodes 10A to 10E shown in FIG. 1 have first to fifth node information signal memories or tables 11A to 11E.
Each of the first to fifth node information signal memories 11A to 11E is divided into first to fifth storage areas assigned to the first to fifth nodes 10A to 10E, respectively. First to fifth node information signal memories 11A to 11A
The contents of 1E are periodically changed or updated as shown in FIG.

More specifically, in FIGS. 1 and 2, the node information signals of the first to fifth nodes 10A to 10E are A to
Indicated by E. As shown in FIG. 2, the first to fifth node information signal memories 11A to 11E are initially loaded with their own node information signals A to E, and the first to fifth node information signal memories 11A to 11E are loaded. ~ 11
E is stored in the central storage area. The remaining storage areas of the first to fifth node information signal memories 11A to 11E are in a reset state in an initial state, and no node information signal is stored.

Here, in order to facilitate understanding of the present invention,
The operation of the third node 10C located between the second and fourth nodes 10B and 10D will be mainly described.
As shown in FIG. 2, in the initial state, the third node information signal C is stored in the third node information signal memory 11C, and the second and fourth node information signals B and D are stored in the second and fourth nodes. Are stored in the node information signal memories 11B and 11D, respectively.

In such a state, the second and third nodes 1
The first notification is performed between 0B and 10C and between the third and fourth nodes 10C and 10D. At the time of the first notification, as a result of bidirectional communication being performed between two adjacent nodes via the clockwise path and the counterclockwise path, the second and fourth node information signals B and D The third node information signal memory 11C is transmitted to the third node information signal memory 11C and is stored in a storage area allocated to the second and fourth nodes in the third node information signal memory 11C. This state is indicated by C1. Similarly,
As shown by B1, the second node information signal memory 11B
Is loaded with the first and third node information signals A and C together with the second node information signal B, as shown at D1,
The fourth node information signal memory 11D is loaded with the third and fifth node information signals C and E.

When the first notification is completed, the second notification is performed in the same manner as the first notification. At this time, the third
As shown by C2, the first node information signal A is transmitted from the second node information signal memory 11B to the third node information signal memory 11C.
And the fifth node information signal E is transmitted from the fourth node information signal memory 11D to the third node information signal memory 11C. In this way, the third node information signal memory 11C is loaded with all of the first to fifth node information signals A to E. Similarly, the first, second, fourth, and fifth node information signal memories 11A, 11A,
Each of 1B, 11D, and 11E is loaded with all of the node information signals included in the ring network system.

As described above, since all of the node information signals are stored in the first to fifth node information signal memories 11A to 11E, the node information signal memories 11A to 11E are stored.
All the node information signals can be monitored only by watching one of them. From this, it will be easily understood that each of nodes 10A to 10E has a function of collecting node information signals in all nodes included in the ring network system.

Since each of the node information signals A to E includes an alarm signal indicating a normal alarm state, monitoring of any one of the node information signal memories 11A to 11E allows the administrator to generate an alarm. Occurrence can be detected.

Each of the first and second notifications is periodically performed by performing bidirectional communication between two adjacent nodes, and the first to fifth node information signal memories 11A to 11A
Update or rewrite each content of 1E.

Referring to FIG. 3, one of the first to fifth nodes 10A to 10E is shown as a node 10 with suffixes A to E omitted. The illustrated node 10 includes a pair of input / output interfaces 21. Each of the pair of input / output interfaces 21 is an OPT connected to an optical path.
It comprises an (optical) transmitter 211, an OPT (optical) receiver 212 and (optical). Each of the pair of input / output interfaces 21 transmits and receives an optical signal defined in SONET. The optical signal includes a communication overhead for communicating the main communication signal with another node.

A pair of input / output interfaces 21 are connected to a pair of SONET overhead processors 22,
The pair of SONET overhead processors 22 is TSA
(Time Slot Assignment) Matrix 23
Connected to. The communication overhead is transmitted to the OPT receiver 212 by the SONET overhead processor 22.
Is detected or extracted from the received signal sent via the. After the processing of the communication overhead is completed, the main communication signal is sent to the TSA matrix 23 which operates as a ring add-drop multiplexer device. As a result, the main communication signal is processed to be added or dropped or to be passed through in a known manner.

Next, the processing operation of the communication overhead will be described. First, it is assumed that the communication overhead is received by the node 10 in the form of a packet including the main communication signal.
In this case, the communication overhead extracted and received via the SONET overhead processor 22 is sent to the address detection unit 25. The address detection unit 25 detects whether the received communication overhead includes an address assigned to the node 10 in advance. If the received communication overhead includes a pre-assigned address, the packet in question is extracted and sent to the communication control unit 26 that controls communication with one adjacent node. The communication control unit 26 forms or separates a packet by a known method.

As for communication between the adjacent node and the node 10, the communication control unit 26 extracts a message sent from the adjacent node after the packet addressed to the node 10 is detected by the above-described method. If this message includes the node information signal of the adjacent node, the node information signal is sent from the communication control unit 26 to the node information signal memory 1.
1 (subscript omitted). As a result, the node information signal is updated under the control of the communication control unit 26. This indicates that the alarm signal is updated or rewritten in the node information signal memory 11 as shown in FIG.

On the other hand, it is assumed that a node information signal is transmitted to an adjacent node. In this case, the transmission packet is formed by the communication control unit 26 in response to the latest node information signal sent from the node information signal memory 11. Such a transmission packet is formed periodically by the communication control unit 26, and is transmitted to an adjacent node. After forming the transmission packet, the address assigned to the adjacent node is added to the transmission packet in the adjacent node address setting unit 27.
As described above, a desired packet including the adjacent node and the latest node information signal is completed by the adjacent node address setting unit 27 and transmitted to the SONET overhead processor 22, converted into an optical signal defined in SONET, and transmitted to the adjacent node. Sent.

Although one embodiment of the present invention has been described above, the present invention is not limited thereto. For example,
The present invention is applicable not only to the SONET system or the SDH system but also to various other ring network systems. Further, unidirectional communication may be performed such that each node collects all node information signals. Also, the ring network system only needs to include at least two nodes for transmitting node information signals between each other.

[0030]

As described above, according to the present invention, if the supervisor can know all the node information signals of a plurality of nodes at each of the plurality of nodes, the labor and time of the administrator can be effectively saved. And collects the node information signals of all the nodes in each node.

That is, according to the present invention, it is possible to obtain a ring network system in which an administrator can easily monitor an alarm.

Further, according to the present invention, the location of a fault in the ring network system can be easily specified, and the labor, cost, and time required to check all nodes included in the ring network system can be saved. You can get the way.

Further, according to the present invention, it is possible to obtain a method in which alarm monitoring at all nodes included in the ring network system can be performed by watching only one node.

[Brief description of the drawings]

FIG. 1 is a block diagram of a ring network system according to one embodiment of the present invention.

FIG. 2 is a diagram for explaining an operation of the ring network system of FIG. 1;

FIG. 3 is a block diagram of a node included in the ring network system of FIG. 1;

[Explanation of symbols]

 Reference Signs List 5 communication path 10A to 10E node 11A to 11E node information signal memory A to E node information signal 10 node 11 node information signal memory 21 pair of input / output interfaces 211 OPT transmitter 212 OPT receiver 22 SONET overhead processor 23 TSA matrix 25 address detector 26 communication control unit 27 adjacent node address setting unit

Claims (5)

(57) [Claims] 1. A ring network system in which a plurality of nodes are connected in a ring, wherein each of the plurality of nodes generates a node information signal indicating a state of the own node; and a plurality of nodes corresponding to the plurality of nodes. A node information signal memory having a node information storage area; and a node information signal corresponding to the own node among the plurality of node information storage areas of the node information signal memory of the own node. Means for storing in the area; communication of the storage data of the entire node information signal memory only with both adjacent nodes, and based on the storage data of the adjacent two nodes, to the other node of the node information signal memory in the own node; The storage of the node information signal of the other node in the corresponding node information storage area indicates that the node information signal in the own node is stored. Ring network system characterized by having; means repeated until the node information signals of all other nodes in Li is stored. 2. The ring network system according to claim 1, wherein the node information signal includes an alarm signal indicating occurrence of an alarm of each node. 3. A method for collecting a node information signal of a plurality of nodes in each of a plurality of nodes used in a ring network system in which a plurality of nodes are connected in a ring, wherein the plurality of nodes correspond to a plurality of nodes. A node information signal memory having a node information storage area of
Preparing; in each of the plurality of nodes, storing a node information signal representing a state of the own node in a node information corresponding to the own node in the plurality of node information storage areas of the node information signal memory of the own node; In each of the plurality of nodes, performing communication of storage data of the entire node information signal memory with only adjacent two nodes, and based on the storage data of both adjacent nodes, Storing the node information signal of the other node in the node information storage area corresponding to the other node of the information signal memory is repeated until all the node information signals of the other nodes are stored in the node information signal memory in the own node. And a method for collecting node information in a ring network system. 4. The node information collecting method according to claim 3, wherein the node information signal includes an alarm signal indicating occurrence of an alarm of each node. 5. The method further comprising: at each node, monitoring the node information signal stored in the node information signal memory and detecting whether the alarm signal is stored in the node information signal memory. The method for collecting node information in a ring network according to claim 4, wherein: