JP2619401B2 - Transmission system configuration method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention detects a failure of its own device or a failure of another device, and prevents the influence of these failures from spreading to the entire network system. The present invention also relates to a transmission system configuration method capable of ensuring transmission efficiency and transmission quality without causing transmission delay of the entire network.

[Conventional technology]

FIGS. 1 (a) and 1 (b) are diagrams showing an example of the configuration of a conventional transmission system, in which 50-1 to 50-N, 52-1 to 52- are shown.
Reference numerals 4,53-1 to 53-3 denote node devices, and reference numeral 51 denotes a transmission path.

In FIG. 1A, strict restrictions are imposed on each of the node devices 50-1 to 50-N constituting the transmission system so that the transmission standards and performance including transmission quality must be completely satisfied. Due to the conditions and the constraints, such a transmission system usually includes only a node device manufactured by a specific manufacturer.

When constructing a system, it is necessary to always be aware of the conditions of the entire transmission system. Unless starting from a completely new design where there is no existing transmission system, a unique Insertion of an individual system into a transmission system has been difficult in terms of system construction flexibility and responsiveness.

[Problems to be solved by the invention]

In the conventional transmission system described above, the components of the system must conform to fairly strict standards, and there is a problem that a failure of one node device or the like affects the entire system. Was.

On the other hand, it is possible to operate the transmission system by setting standard provisions with a certain width.However, in this case, it is assumed that the transmission system absorbs differences in technology etc. by the device manufacturer. Inevitably, from the viewpoint of the performance of the node device itself, in each of the performance items of the node device constituting the transmission system and the failure handling processing, etc., the redundant transmission standardized to the lower limit of the service required for the system concerned There is a drawback that it becomes a system.

In order to solve the above problem, as shown in FIG. 1 (b), a group transmission system is formed by the same type of node devices, and the node device relays between the two transmission systems.
Some devices are provided by connecting 53-1 to 53-3, but in such a configuration, the node device 53 that relays between them is provided.
In the case of -1 to 53-3, there is a problem that a transmission delay is inevitably generated when a token is captured.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional drawbacks, and has as its object to provide a transmission system configuration method which has a high degree of freedom in system configuration and does not cause transmission delay.

[Means for Solving the Problems] According to the present invention, the above-mentioned object is achieved by the means described in the claims.

In other words, the present invention provides a token ring type network system, in which a detection mechanism for detecting a failure of its own device and a failure of an adjacent device is provided, and a node device which controls itself by information obtained thereby is used. A transmission mechanism for transmitting fault detection information to a related node device or a network management station as necessary, and receiving information related to device control from the related node device or the network management station. A relay unit that relays the information other than the information related to device control of its own device without any processing and a node device that has a common control unit that controls these units are connected by a transmission line. By doing so, a transmission system is configured.

〔Example〕

FIG. 2 is a diagram showing an example of the configuration of a system for implementing the present invention, where 10 is a node device, and 11 and 12 are nodes having the same structure and function as the node device 10 connected to the transmission system. Device, 15 and 16 scissor node device 10
And 12 are node devices that are not on the side, 17 is a transmission line in the transmission system in which the node devices 11 and 12 are connected, and 18 is a transmission line in the transmission system in which the node devices 15 and 16 are connected. I have.

FIG. 3 is a diagram showing an example of the configuration of a node device according to the first embodiment of the present invention. Reference numeral 21 denotes a detection mechanism for detecting a failure in its own device and a failure in an adjacent device, and 22 denotes its own device. Relaying the information as it is from the transmission line 17 to the transmission line 18 or vice versa without adding any processing to the information that has arrived, or a relay unit that can relay the information by setting the transmission lines 17 and 18 to the bypass state, Reference numeral 23 denotes a common control unit for performing control between the units.

In the transmission system, the operation in a state where no device failure or the like occurs does not include the information flowing through the transmission path 17 that is sent to the relay unit 22 in the own node device 10, and the relay unit 22 performs any operation on the information. Transmission line 18 without processing
And the information returned through the transmission path 18 is transmitted to the transmission path 17 without any processing by the relay unit 22 in the same manner as described above, and the transmission paths 17 and 18 use one token ring method. It is configured to form a transmission system.

Here, the transmission system refers to the transmission path 17 and
This refers to the entire system formed by the above-described one token ring system formed at 18, and the same applies to the following description.

In the present embodiment, such an operation does not cause a transmission delay due to a token capture or the like that occurs when information is relayed in the own node device 10, and prompt transmission of information is possible.

In such a state, for some reason, the own node device 10
When the detection mechanism unit 21 detects that a failure has occurred in the communication system, the detection unit 21 notifies the common control unit 23 of the event, and the common control unit 23 receiving the notification notifies the common control unit 23 of maintaining the transmission system set in advance. And instruct each unit about a countermeasure.

The instruction includes, for example, prohibiting the relay of information between the transmission path 17 and the transmission path 18 via the own node device 10, that is, prohibiting the fetching of information by setting the relay unit 22 to the bypass state, or the failure location. There is a method in which a return is made at a normal location before a failure location in order to remove only from the transmission system.

Further, in the transmission system, when the detection mechanism unit 21 can automatically detect that information is not flowing through the transmission line 17 or 18, the node device 11, 12, 15, or The detection mechanism unit 21 determines that a failure has occurred in the 16 relay units or the like, notifies the common control unit 23 of the event, and the common control unit 23 executes the above-described processing.

By such an operation, when a failure of the node device or a problem occurs in the transmission system, the trouble or the inconvenient part is automatically removed, and a trouble of the entire transmission system caused by the trouble can be prevented. Therefore, not only can an efficient and stable transmission system be constructed, but also a transmission system that can absorb the singular points of the node devices 11, 12, 15, and 16 can be realized.

FIG. 4 is a diagram showing an example of the configuration of a node device according to a second embodiment of the present invention. The communication mechanism unit receives failure detection information from a related node device and information related to device control from the related node device. This is the same as the first embodiment except that 24 is provided.

In the figure, for a fault that has occurred in the own node device 10 and can be dealt with in the own node device, the common control unit 23 that has received the fault notification of the detection mechanism unit 21 applies a preset countermeasure to each unit. While instructing, the event is transmitted to other node devices 11, 12, and
The information is transmitted to 15 and 16 as information relating to device control as necessary.

If the failure of the other node device 11, 12, 15, or 16 cannot be detected by the node device 11, 12, 15, or 16 itself and is indirectly detected by the detection mechanism unit 21 of the own node device 10, the failure of the event The occurrence is notified to the common control unit 23, and the notified common control unit instructs the own node device 10 to execute the necessary measures similar to the above-described operation, or sends the request to the other node devices 11, 12, 15, or 16 The information is transmitted as information on device control.

Regarding the information related to the above-described device control flowing through the transmission line 17 or 18, the relay unit 22 of the node device (in this case, the node device is described as 10) that has received the information.
Detects that the information is related to device control, transmits the information to the communication mechanism unit 24, and receives the information.
At 24, after performing the receiving process, the information is
Transfer to 23. The common control unit 23 controls each unit in the device based on the information.

By such an operation, the node device that has detected the occurrence of a failure or the like in its own node device or indirectly in another node device is the first node device.
By operating more actively than in the embodiment of the invention, it is possible to maintain a responsive and efficient transmission system.

FIG. 5 is a diagram for explaining a third embodiment of the present invention, which is the same as the second embodiment except that a network management station 14 is added in the transmission system.

Note that the network management station in this case is
What is necessary is that it is connected to at least one of the transmission lines 17 and 18, and in the following, it is assumed that one is connected to the transmission line 17.

In this case, the operation in the first embodiment and the second embodiment of the present invention is controlled by the common control of the node devices 10, 11, 12, 15 or 16 which directly or indirectly detects an event such as a failure. Although the unit 23 independently issues a countermeasure instruction, those within the processing range of the common control unit 23 of the node device 10, 11, 12, 15, or 16 are the same as described in the second embodiment. In the other range, the occurrence of the event is notified to the network management station 14 via the communication mechanism unit 24, and the network management station 14 that has received the notification performs an optimal countermeasure on the notification. A measure is determined and transmitted as information on device control to the related node device. The node device that has received the information on device control performs the same processing as that described in the embodiment of the second invention.

By such an operation, the common control unit in each node device
23, it is easy to centrally manage the state of each node device in the network management station. Compared to the first and second embodiments, each node device and the network management station can control the device control. And an advanced transmission system can be realized.

〔The invention's effect〕

As described above, the present invention is provided with a detection mechanism for detecting a failure of its own device and a failure of an adjacent device, and configures a transmission system by node devices controlled by information obtained thereby. Further, if necessary, a communication mechanism for transmitting failure detection information to the related node device or the network management station and receiving information related to device control from the related node device or the network management station is provided. Since it is a token ring transmission system composed of a relay unit that relays information other than the information related thereto without any processing and a node device having a common control unit that controls these units, Because the performance of the device itself is not degraded, and there is no transmission delay that occurs when relaying information An advantage of constructing a high efficiency and stable transmission systems.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of the configuration of a conventional transmission system, FIG. 2 is a diagram showing an example of the configuration of a system implementing the present invention, and FIG. 3 is a node device according to the first embodiment of the present invention. FIG. 4 is a diagram showing an example of the configuration of a node device according to a second embodiment of the present invention, and FIG. 5 is a diagram explaining a third embodiment of the present invention. 10 to 12, 15, 16, 25 ... node device, 14 ... network management station, 17, 18 ... transmission line, 21 ... detection mechanism unit, 22 ... relay unit, 23 ... common control unit, 24 …… Communication mechanism

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Mitsuo Iwama Nippon Telegraph and Telephone Corporation, 1-6-1, Uchisaiwaicho, Chiyoda-ku, Tokyo (56) References JP-A-59-253 (JP, A) JP-A Sho 62-190949 (JP, A)

Claims (3)

(57) [Claims] A first system of a token ring system in which a plurality of node devices having a signal relay function are connected by a first transmission line, and a plurality of node devices having a signal relay function are provided in a second system. The second of the token ring system connected by transmission line
, Which operates as a node of the first system and also operates as a node of the second system, and processes information arriving at its own device in a node device which exchanges information between different systems. Relay means for relaying information from the first transmission path to the second transmission path or vice versa, or to place the first transmission path and the second transmission path in a bypass state to relay information; And detects a failure that has occurred in its own device, including a failure of a connected device, and detects a failure of an adjacent node device based on information transmitted from a node device connected to the first or second transmission path. And a means for controlling the operation of the own node device based on the failure information detected by the means. 2. Notifying the node device of information relating to the detected failure of the own node device or information relating to the control of the node device to another node device, and receiving information relating to the failure or control from the other node device. 2. The transmission system configuration method according to claim 1, further comprising a communication mechanism having a function of performing the operation. 3. The system according to claim 1, wherein at least one of the node devices connected to the signal transmission path functions as a network management station for centrally controlling and managing each of the other node devices. Item (2): A transmission system configuration method.