JPH03280752A - Data communication network - Google Patents

Abstract

PURPOSE:To avoid interruption of communication on its way by informing fault information by call dependent management from an exchange station to a network management center, allowing the center to retrieve a fault block based on the information and allowing the exchange station to implement the changeover to a designated substitute route. CONSTITUTION:For example, a fault takes place in a line 103, a call monitor 1 of an exchange station 100 finds out calls A, B through a line 103 to stop the flow of callers 510, 520 and applies route-resetting request to a network management center 500. A route setting controller 3 of the center 500 inquires about a fault state to a station 200 based on the sent route information and selects a line 104 when the disabled communication is discriminated, and gives a command to the stations 100, 200 to reset in the line 104. A route resetting device 2 of the stations 100, 200 applies route resetting by the line 104 according to a command from the center 500. Thus, interruption of communication on its way due to a fault is avoided.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a network management center that manages the entire data communication network, and data that is connected to the network management center via a communication line and is managed and controlled by the network management center. It relates to a data communication network including a switching center.

[Prior Art 1] Conventionally, in this type of data communication network, if there is a line failure or system failure at a station, the route passing through that location is cut off, and the call is abandoned. In order to continue data transfer, IT: ! , it was necessary for the i subscriber to perform the call origination process again for route setting.

[Problems to be Solved by the Invention] In the conventional data communication network mentioned above, there is no way to rescue a call in the event of a line failure or a station system failure, and the subscriber himself or herself is required to set up a call again. As a result, subscriber terminals and host computers were struggling to process restarts and take measures to recover from interrupted communications.

[Failure to solve the problem]

The data communication network of the present invention monitors all calls passing through its own station, and when it discovers a call in which it is determined that normal data transmission/reception is not being performed, it re-routes the call with route information within the network added. 11. Send setting request to network management center. When the call monitoring device sent by the call monitoring device receives the reconfiguration route information and the route reconfiguration instruction sent by the network management center, the route reconfiguration unit performs the reconfiguration of the route I indicated in the reconfiguration route information. The setting device temporarily suspends the reception of calls that are determined not to be transmitted and received normally, causing the subscriber to hold the transmission of the call, and connects the held call by resetting and communicating. Each data exchange center has a reconnection means for restarting the route, and when a first route reconfiguration request sent from a call monitoring device of any data exchange center is received, the network attached to the route reconfiguration request is reconnected. Based on the internal route information, inquiries are made to the required exchanges on the route to see if the call is in a state where it can flow normally, and all stations between the two stations where data is not flowing normally are asked to The network management center includes resetting route information for setting a normal route and a route setting control device for issuing route resetting instructions.

[Effect]

In this way, the data switching center reports fault information through call-based management to the network management center, and the network management center searches for the faulty section based on the fault information and switches to a specified alternative route and reconnects accordingly. By having the data exchange center directly execute the process, interruption of data communication due to route failure can be avoided.

[Embodiments] Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a configuration diagram of an embodiment of a data communication network according to the present invention, Fig. 2 is a flowchart of the operation of the station 1oo that has detected a failure, and Fig. 3 is a flowchart of the operation of the station 1oo that has detected a failure. FIG. 4 is a flowchart of the operation of station 10.
0.200.300.400 and the network management center 500; FIG.

Data exchange station within the network (hereinafter referred to as station) 1
00.200°300°400 all have a call monitoring device M1 that monitors whether call data is flowing normally, and a route resetting device 2 that reconfigures the route. In addition, the network management center 500 is connected to the data switching centers 100.200.300.400 in the data communication network, and transmits and receives data to the data switching centers 100.2.
It monitors and controls 00.300.400, detects the reconfiguration route (reset route) in response to route reconfiguration requests from stations 100, 200.300.400, and instructs the station to reconfigure the route. It includes a route setting control device 3 for issuing a route. to the data exchange center 100 (j-communication line 301.3
02 respectively accommodate subscribers 510 and 520;
The data exchange center 300 accommodates subscribers 610 and 620 by numbers 401 and 402, respectively. station 1
00 and the station 200 are connected by communication lines 101-104, and the stations 200 and 300 are connected by lines 201-204. Furthermore, a communication line 105 is connected between the station 100 and the station 400,
The stations 300 and 400 are connected through a line 205.

Next, the cause of the call route being disconnected or the call data flow stopping may be a line system failure, one station going down, or a wide area within the station. The treatment for this will be explained with reference to FIGS. 2 and 3.

When a line system failure such as a modem failure, CD off, or CS off occurs, it is detected by the line monitoring device (not shown) of the exchange (step 11), and the call monitoring device 1 transmits the information to the line monitoring device (not shown). Step 12) finds all calls that have been received and whose route is the faulty line, stops the flow on the subscriber side for each call (step 12), and collects network routes and communication information for all these calls (step 12). Step 13). Next, the call identifier, faulty line information.

A route resetting request is made to the network management center 500 with route information within the call network added (step 14).
). Now, for example, if a failure occurs on line 103, station 10
0's call monitoring device l recognizes that the calls passing through line 103 are call A between subscriber 510 and subscriber 610, and call B between subscriber 520 and subscriber 620. Then, in order to prevent data from flowing into the line 103, the reception flow on the subscriber 510 and subscriber 520 sides is stopped. That is, in the case of packet switching, the reception window on the subscriber side is closed. Here, the calls on line 103 are calls corresponding to each logical channel. The call monitoring device 1 of the station 100 recognizes these calls and issues a route resetting request to the handling network management center 500.

The route setting control device 3 of the network management center 500 is connected to the station 100.
When a link reconfiguration request is received from
Step 21). First, based on the sent route information for calls A and B, an inquiry is made to the station 200 about the status of calls A and B and the status of the line 103 (step 22.2).
3) Similarly to the station 100 side, calls A and B were canceled due to a line failure.
If it is determined that data transmission/reception is not possible, route setting control device 3 selects line 1 from among the lines between station 100 and station 200.
Select one other than 03 and use it as station 1 for call A and call B.
00 and station 200. When line 104 is selected as a new route, route setting control device 3
and instructs station 200 to reset the route on line 104 (step 24). Further, the route setting control device 3 receives a route resetting request from the station 100, and
If a route resetting request for the same call is received from station 200 before the above inquiry to 00, no inquiry is made to the station. Here, the same line 104 is selected for calls A and B, but different lines may be selected.

When the station 100.200 receives a route resetting instruction from the network management center 500, the route setting device 2 of the station 100.200
performs route resetting only for line 104 based on resetting route information from network management center 500 (step 15). Next, a method for reconnecting a pending call whose flow has been stopped will be described for call A in the case of packet switching. The same applies to call B. If the calling party of call A is 510, the station 100 performs a calling process as a route setting process (step 16). In other words, a vacant logical channel on the line 104 is selected and the CR packet is sent to the station 200.
Send to. The other party's address at this time is subscriber 61.
0 address. Then, to indicate that this CR packet is a link reconfiguration request, a call identifier is placed in the facility section of the CR. When a CC packet is received as a response from the station 200, the link setting is deemed to have been completed, a window on the subscriber 510 side is opened, and data transmission and reception is resumed. Then, the network management center 500 reports the completion of the route setting (step 17). On the other hand, the station 200 is different from the station 100;
When the subscriber 610 waits to receive a CR packet and receives a CR packet for resetting the route, it returns the CC packet after completing internal processing such as initial settings, opens a window on the subscriber 610 side, resumes data transmission and reception, and completes the route setting. Report (step 17).

The route is reconfigured using the above steps. The transmission and reception of signals between the station 100.200 and the network management center 500 during this time is as shown in FIG.
A route resetting instruction 32 is sent from the network management center 500 to the station 10.
0, a route reestablishment instruction 33 is sent to the station 200. Correspondingly, when the route resetting is completed, route completion notifications 34 and 35 are sent from the stations 100 and 200 to the network management center 500, respectively.

Next, a case in which a route is disconnected due to a failure of a line accommodation processor in a station will be explained with reference to FIG.

The line accommodation processor of station 200 is down and lines 101~
When 104.201 to 204 become unavailable, the call monitoring devices 1 of stations 100 and 300 request route resetting for calls A and B, respectively, to the network management center 500. Upon receiving the route resetting request, the route setting control device 3 of the network management center 500 learns of the fault in the line accommodation processor of the station 200 by making an inquiry to the station 200 or receiving alarm information (step 23), and calls the call A. Station 20 against B
Lu River/station 100-station, 400-station 300 that does not pass through 0
Select station 100, station 4 (Hl, station 3110 i:
This instruction allows the route to be reconfigured, but in the case of a bucket exchange, as in the case of line failure, the station +00 uses the CR bag with the call identifier information in the facility section. In this case, the acquisition of the line and logical channel is the same as the hunt method in normal call setup, and in order to synchronize the sending and receiving numbers of packet data, CR packets are used to send out the current sending and receiving data of the call. The station 300 receives the CR bucket and sends back the CC bucket after completing synchronization confirmation.After each station completes route setting, data transmission and reception begins.

[Effects of the Invention] As explained above, the present invention provides each data switching center with the functions of monitoring the passage of each call, resetting the route according to instructions from the network management center, and restarting the L2 connection without putting the call on hold. In response to the route resetting request from each station, the network management 1-tsuku specifies an alternative route and only instructs the corresponding station to switch. The second and second feature has an extremely large effect in that continuous service can be provided without disconnecting the subscriber's call even in the event of line system failure within the network or station system down.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the daytime communication network of the present invention;
2 is a flowchart of the operation of the station 100 that has detected a failure, FIG. 3 is a flowchart of the operation of the network management system 1)00 in response to a reconfiguration request from the station, and FIG. 4 is a flowchart of the operation of the station 100. 200 and the network management center 500. FIG.

Claims (1)

[Claims] A network management center that manages the entire data communication network;
In a data communication network that includes a data exchange center that is connected to a network management center via a communication line and is managed and controlled by the network management center, all calls passing through the local station are monitored, and calls that are judged to not be transmitting or receiving data normally are removed. When the call monitoring device detects the call, it sends a route reconfiguration request to the network management center with the route information in the network attached, and the call monitoring device sends the reconfiguration route information and route reconfiguration instruction sent by the network management center to the network management center. When received, the route reconfiguration device reconfigures the route indicated in the reconfiguration route information, temporarily suspends reception of the call for which it is determined that normal transmission/reception cannot be performed, and sends the call to the subscriber side. Each data exchange center has a reconnection means that suspends the transmission of the suspended call and resumes communication by reconnecting the suspended call by resetting the route. When a setting request is received, an inquiry is made to the required switching center on the route based on the network route information added to the route resetting request to see if the call is flowing normally, and the data is Data communication characterized by having a route setting control device in a network management center that issues resetting route information and route resetting instructions for setting other normal routes to all stations between two stations where the flow is not normal. network.