JPS63164738A - Network state supervising circuit - Google Patents

Abstract

PURPOSE:To relieve the load of the maintenance personnel by applying retrieval processing depending on the switching state of a node and a path map so as to discriminate the propriety of use of the systematic path thereby raising an alarm in case of a fault. CONSTITUTION:A switching state memory 14 of nodes 5, 6 inputs the switching state of the nodes 5, 6 and stores it and a retrieval circuit 15 starts the path retrieval of the pass map 12 taking this input as a chance. If the path is faulty in terms of system, a node (N1) in a path 1 (P1) is read to reference the node N1 of a node map 13. In this case, since the content of the switching state memory 14 is OFF, a path 2 (P2) is selected and a node (N2) of the path map 12 is read again to reference the N2 of the node map 13. Since the content of the switching state memory 14 is ON in this case, a path 4' (P4') is referenced to read NG from the P4' of the path map 12, it is discriminated to be path fault in terms of system to raise an alarm output. Thus, it is not required for the maintenance personnel to supervise always the external display device and the load is relieved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a network status monitoring circuit, and more particularly to a monitoring circuit for determining whether or not a system path is in use.

[Conventional technology]

Conventionally, this type of network monitoring circuit inputs the switching state of a node from the outside, expresses this state information on an external display, for example, a CRT image, or characters, and outputs it for display on a one-to-one basis.

[Problem that the invention seeks to solve]

The conventional network monitoring circuit described above only displays the switching status of nodes as is on an external display, but does not determine whether or not the system-wide path usage status is available.Therefore, there are routes that should not be used systematically. Since it is not possible to issue a warning even if the external display is used, there is a drawback that maintenance personnel must constantly monitor the external display.

SUMMARY OF THE INVENTION An object of the present invention is to provide a network status monitoring circuit that solves the above problems.

[Means for solving problems]

The present invention includes a node switching state memory that stores the switching state of network nodes that determines the route of a signal flowing through a network path, and has a one-to-one correspondence with each node; A route map in which an identification mark is added to the exit path to express the system and distinguish between usable and unusable paths. It is characterized by having a search circuit that traces from the entrance path to the exit path of the route map while referring to the memory, determines whether or not the path can be used systematically based on the identification mark, and outputs the result to an external display device or the like. This is a network status monitoring circuit.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, the present invention includes a node switching state memory 14 that stores the switching state of the network nodes that determines the route of the signal flowing through the network path, and has a one-to-one correspondence with each node; A route map 11 representing all routes up to the path and adding identification marks to exit paths to distinguish between paths that must not be passed and paths that can be passed, and the node switching state memory 14. Every time a switching state is input from the outside, the path is traced from the entrance path to the exit path of the route map while referring to the node switching state memory 14, and the system determines whether or not the path is in use based on the identification mark. The search circuit 15 includes a search circuit 15 for outputting to a display device or the like. 12
indicates a path map, and 13 indicates a node map. A route map 11 shows the route of the network shown in FIG. The route map 11 is composed of a bus map 12 indicating reference instructions from a path to a node, and a node map 13 indicating reference instructions from a node to a path. Node switching status memo January 4 inputs and stores the node switching status shown in FIG. In response to this input, the search circuit 15 starts searching for a route in the bus map 12 from Pl.

FIG. 2 shows a network made up of paths 1-4 and nodes 5 and 6. Figures 3 and 4 show the switching states of nodes 5 and 6, with nodes 7 and 9 in the OFF state, and 8° and 10 in the OFF state.
N states are respectively represented.

Read node 1 (Nl) in path 1 (PI) that is normal in the system and refer to N1 in node map 13. In this case, since the contents of the switching state memory 14 are OFF, the path 2 (P2)
Select. From this Pi, node 2 (N2) of the bus map 12 is read again and N2 of the node map 13 is referred to. At this time, since the contents of switching status memo sound 4 are OFF', refer to path 4 (P4) and select P4 of bus map 12.
The system reads OK from the path and determines that the route is normal.

Systematically, if bus 1 (Pi
) is read out and Nl in the node map 13 is referred to. In this case, since the contents of the switching state memory 14 are OFF, path 2 (P2) is selected. From this P2, node 2 (N2) of the bus map 12 is read again and N2 of the node map 13 is referred to. At this time, since the contents of the switching state memory 14 are ON, the path 4' (P4
), reads NG from P4' of the bus map 12, determines that the route is abnormal from a system standpoint, and outputs a warning.

〔Effect of the invention〕

As explained above, the present invention can determine the usability of a systematic route by performing a search process based on the node switching status and the route map, and can issue a warning in the event of an abnormality, thereby reducing the burden on maintenance staff. effective.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the network configuration, FIGS. 3 and 4 are diagrams showing the switching states of each node, and FIG. 5 is a diagram showing the system configuration. FIG. 6 is a diagram showing an example of a case where the route is normal, and FIG. 6 is a diagram showing an example of a case where the route is systemically abnormal. 11... Route map 12... Bus map 13
... Node map 14 ... Node switching state memory 15 ... Search circuit

Claims (1)

[Claims] (1) A node switching state memory that stores the switching states of network nodes and corresponds one-to-one to each node, which determines the route of signals flowing through the network path, and all routes from the entrance path to the exit path. A route map in which an identification mark is given to an exit path to express the system and distinguish between usable and unusable paths; It is characterized by having a search circuit that traces from the entrance path to the exit path of the route map while referring to the memory, determines whether or not the path can be used systematically based on the identification mark, and outputs the result to an external display device or the like. network status monitoring circuit.