JPH0487434A - Transmission control system in private network system - Google Patents

Abstract

PURPOSE:To prevent the loss of a call and to improve the reliability of the system by executing an automatic detour to a backup circuit at the time of fault of a transmission circuit, and also, executing automatically the flow control of an overflow call to a different circuit at the time when the traffic quantity exceeds a prescribed value. CONSTITUTION:When abnormality is generated and it is a high speed digital circuit fault between a device 1 and a device 2, an automatic detour is executed by an ISDN network. Also, in the case of a fault between the device 1 and a device 3 or between the device 2 and the device 3, the automatic detour is executed by a telephone network. On the other hand, when congestion of traffic is generated in a high speed digital circuit of the device 1 - the device 2, the overflow traffic intensity executes a detour by the ISDM network. Also, in the case of a fault of the device 2 or the device 3, the detour is executed by the telephone network.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an online information processing system that detours to a backup line when a transmission line failure occurs in a private network (internal company communication network), and also maintains a constant amount of traffic. Transmission control is automatically performed to prevent call loss, such as flow control of overflow calls to another line when the limit is exceeded, and when a failure is recovered, control is applied to switch back from the detour line to the working line, and overflow control is performed. The present invention relates to a transmission control method in a private network system that can automatically control to cancel detour control and continue using a working line when a call is canceled.

[Conventional technology]

Conventionally, multiplex transmission paths have been constructed with multiple routes to improve reliability, and in the event of a failure, the configuration of the transmission path is switched to minimize the impact on the transmission network.

Methods for selecting a backup transmission line include direct multi-route switching, in which another transmission line parallel to the working transmission line is switched as a backup, and detour route switching, in which a transmission line passes through another station.

In addition, in microwave lines using the FM radio relay system, in order to ensure the required line operation rate, a line switching device is installed at both terminal stations, and a continuous pilot signal for wireless line monitoring is sent from the transmitting terminal station outside the upper band of the baseband. This is continuously detected at the receiving end station, and when a line failure is detected due to signal interruption, the line is switched by a line switching device (r Electronic Communication Handbook, March 30, 1970, Ohmsha Co., Ltd.) Published, pp, 1003-1004.pp, 1081-1
082).

However, in online information processing systems, automatic switching to a backup line in the event of a failure is not performed. Overflow calls are also discarded.

[Problem to be solved by the invention]

In conventional online information processing systems, automatic backup control functions have become mainstream. That is, when a transmission line fails, the failure of the line is displayed on an external alarm display device of the system accommodating the line. The system operator continued data transmission by manually switching to the telephone line (public communication network) based on this warning display.

On the other hand, if the fault in this line is recovered, the line is automatically or manually switched back to the working line and data transmission continues.

However, in online systems that propagate important data, such as those of financial institutions, switching in the event of a failure or data being discarded due to overflow calls causes a decrease in reliability.

The purpose of the present invention is to solve these conventional problems, constantly monitor traffic volume and failures, automatically divert only overflow calls, and automatically switch to a detour line even in the event of a failure. An object of the present invention is to provide a highly reliable transmission control method in a private network that can minimize call loss by automatically switching back upon recovery.

[Means for Solving the Problems] In order to achieve the above object, the transmission control method in the private network system of the present invention includes installing at least two public lines as backup lines in parallel with the dedicated line, and By constantly maintaining a monitoring bus between devices, and in the event of a dedicated line or device failure, lower-level devices notify the monitoring device connected to the higher-level device.
A program within the monitoring device is activated, and when traffic congestion occurs on the dedicated line, the overflowing call volume is automatically diverted to the backup line, and when a dedicated line failure between devices occurs, the backup line is automatically diverted. take an automatic detour,
In the event of equipment failure, the backup line is automatically diverted, and when the dedicated line and equipment failure is recovered,
The feature is that it automatically switches back to the dedicated line, and when there are no more overflow calls, it automatically switches back to the dedicated line. In that case, the monitoring equipment can be equipped with a console so that even if the dedicated line and equipment do not fail or overflow calls occur, a detour to the backup line can be made by inputting commands from the console. Another feature is that connection and switching back to the dedicated line are performed.

[For production]

In the present invention, the private network of an online information processing system is automatically detoured to a backup line when a transmission line fails, and
When the amount of traffic exceeds a certain value, flow control is automatically performed to transfer overflow calls to another line to prevent call loss. In addition, when the fault is recovered, control is automatically performed to switch back from the detour line to the working line, and when the overflow call is resolved after a certain period of time, the detour control is stopped and data is transmitted using the working transmission line. continue.

To this end, we have a function that constantly monitors the line status in the network, a function that detects overflow, a function that diverts overflow calls, a function that switches to the detour line in the event of a failure, and a function that switches from the detour line to the current line when there are no overflow calls. It has a function to switch back to the line, a function to switch back to the working line in case of failure recovery, and at least two line detour routes.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a line detour configuration diagram showing an embodiment of the present invention.

In FIG. 1, 1 to 3 and 13 are device 1, device 2, and device 3, which are packet switches that perform packet message distribution, flow control, and detour control; 4 and 14 are device 4, which is a transmission control device; and 5 is a device. 5 is provided with a control section 28, a console 29, and a printer 30, and has a network monitoring function, a command input function, and an output function. Further, 6 and 16 are devices 6, which are equipped with an I5DN (integrated digital communication network) conversion function, and 7, 17, and 27, 37 are devices 7, which are line changeover switches. 8, 9, 11.12 are line termination devices, 13, 15, 18, 19, 20゜21.22, 2
3, 24, and 25 are modems (modems).

Also, ■■■ is a dedicated line (private network), ■■■■■ is a detour line (public network, ■ is an l5DN network, others are telephone networks), and ■[phase] is a part of the detour line. It is a connecting line.

A monitoring bus is installed between the devices, and in the event of a line or device failure, the lower device notifies the higher device, and finally the device 5 is notified. Device 5 connects devices 1, 2, when a failure is detected and when a flood call is detected.
3.13 Instruct the (packet switch) to perform detour control and flow control, respectively.

For example, when an overflow call occurs, line 0 of the 15DN network can be selected as the detour line for line (2).

Further, line 0 of the telephone network can be selected as a detour line for the line (■). Further, line 0 of the telephone network can be selected as a detour line for the line (■). Furthermore, line 0 of the telephone network can be selected as a detour when the device 2 becomes a failure. Further, as a detour when the device 3 is in failure, it is possible to select the telephone network (■) and the connection line (■), or the telephone network (■) and the connection line ([stock]). Further, when both the device 2 and the device 3 are at fault, the telephone network (2) and the connection line (2) can be selected as a detour route.

FIG. 2 is a processing flowchart in FIG. 1.

As mentioned above, a monitoring bus is always connected between the devices shown in FIG. 1, and when a line or device failure occurs, the lower device notifies the higher device. That is, the notification is sent along the route of device 4 -> device 3 - device 2 -> device 1 -> device 5. When a failure or an overflow call is notified, the program in the monitoring device 5 starts up and runs the flow shown in FIG. 2, automatically instructing the transmission control device to set a terminal identification address, By operating , a detour connection is made to the backup line.

When an abnormality occurs, it is first determined whether or not it is a fault in the dedicated line (step 200). If it is a fault in the high-speed digital line between devices 1 and 2, an automatic detour is performed using the 15DN network (steps 201 and 203). ). Furthermore, if there is a failure between devices 1 and 3 or between devices 2 and 3, an automatic detour is performed using the telephone network (steps 202 and 204).

On the other hand, if there is no line failure in the dedicated line, devices 1 to 2
When traffic congestion occurs on the high-speed digital line, the overflowing call volume is detoured through the I5DN network (steps 205 and 203).

Furthermore, if there is a failure in device 2 or device 3, a detour is made to the telephone network (steps 206 and 207). Note that the device 1 detects a failure in the device 2, and the device 2 detects a failure in the device 3, and notifies the higher-level device (device 1) respectively.

The operation will be explained below using a detailed flowchart. Second
In the case of a line failure between device 1 and device 2 in step 203 in the figure, and in the case of congestion occurring between device 1 and device f2, in FIG. Figure 4 shows the case of line failure in step 20.
The case of failure of device 2 or device 3 in No. 7 will be explained with reference to FIG.

FIG. 3 is a flowchart of line control between devices 1 and 2. That is, it shows the procedure of the detour process from ■ to ■ in FIG.

Figure 3 (A) shows the process to be performed when a dedicated line failure and congestion occurs on the dedicated line, and Figure 3 (B) shows the process to be performed when an I5DN is in use.
Processing when an SDN network line failure occurs, Figure 3 (C)
is the process of switching back from the l5DN to the dedicated line at the time of recovery, the third
Figure (D) shows detailed processing for making a detour connection to the 15DN network.

First, in Figure 3 (A), if there is a line failure in the dedicated line, (
Step 300), a message is output to device 5 (step 301), and a detour connection is made to the 15DN network according to instructions from device 5 (step 301.a).

Then, send a message indicating the end of the detour connection! 5 (step 302). In addition, if there is no problem with the leased line, CCI TT's X is sent to the leased line.

Although the throughput classes specified in 25 are set in advance, when the total of the throughput classes exceeds the specified value due to traffic congestion (step 303), a message to that effect is output to the device 5 (step 304). . According to instructions from the device 5, it connects to the 15DN network and only overflow calls are diverted (step 304a). Then, a detour completion message is output to the device 5 (step 305).

Even if the total throughput class does not exceed the specified value, the detour can be made to the 15DN network based on an instruction from the device 5. At this time, by inputting a command from the console of the device 5 (step 306), a detour connection is made from the dedicated line to the 15DN network (step 306a).
). A detour completion message is output to the device 5 (step 307).

Next, in Figure 3 (B), TSD is detected while using the 15DN network.
If a line failure occurs in the N network, make a detour connection to the ■SDN network again (step 308a), and once the connection is completed (
Step 308), and outputs a detour completion message to the device 5 (Step 309).

Next, FIG. 3(C) shows the process of switching back from the 15DN network to the dedicated line. In this case, the dedicated line is constantly monitored by the device l.

When the dedicated line is restored (step 310), check in advance from the console of the device 5 whether the return time after the restoration of the dedicated line has been set, and if a certain period of time has passed after restoration (step 311), the return time to the dedicated line is After performing the cutback process (step 312) and completing the ISDN line disconnection to be cut back, a cutback completion message is output to the device 5 (step 313).

Even if the dedicated line is not restored, by issuing a command from the console of device 5 (step 314), l5
Switch back from the DN network to the dedicated line (step 31)
2) A switchback completion message is output to the device 5 (step 313).

In addition, even if the dedicated line has not been restored and no commands are input from the device 5, the l5
When only the call volume overflowing to the DN line is being detoured, l5DN
When the line is no longer overflowing with calls (step 315),
The I5DN network is switched back to the dedicated line (step 312), and a switchback completion message is output to the device 5 (step 313).

If there are still overflowing calls on the 15DN line, the process continues until the number of calls reaches O' (step 316).

Next, FIG. 3(D) is a flow showing the connection method of the 15DN network, and steps 301a and 30 of FIG. 3(A)
4a, 306a, and step 308 of FIG. 3 CB)
The details of each process of a are shown.

First, since device l has a plurality of boats, it selects an empty boat to make a call (step 350).

Next, the device 1 is automatically connected to the device 2 via the 15DN network (step 351), and the leased line connection is logically switched to the 15DN connection. Next, if the connection is completed, the process ends, but if it is determined that the connection is not possible (step 352), an abnormal message is output to the device 5 (step 353), and the l5DN connection is automatically made again (step 351). ).

FIG. 4 is a flowchart of a line control method between devices 1 to 3 and devices 2 to 3 in FIG. 1.

That is, the procedure of the detour process from ■ to ■ and from ■ to ■ in FIG. 1 is shown.

In FIG. 4(A), first, if the dedicated line is faulty (step 400), a fault message is output to the device 5 (step 401), and then a bypass connection is made to the telephone network (step 40).
2) A detour completion message is output to the device 5 (step 403).

Furthermore, even if the dedicated line is not faulty, by inputting a command from the device 5 (step 404), the device 5
After outputting the detour start message to (step 405)
, make a detour connection from the dedicated line to the telephone network (Step 406)
, outputs a detour completion message to device 5 (step 4
07).

Next, in FIG. 4(B), if a telephone network line failure occurs while using the telephone network, a detour connection to the telephone network is made again (step 408a). Once the connection is complete (step 408)
, outputs a detour completion message to device 5 [Step 4
09]. If the detour connection is not possible, the connection is started again (step 408a).

Next, in FIG. 4(B), if a telephone network line failure occurs while using the telephone network, a detour connection to the telephone network is made again (step 408a). Once the connection is complete (step 408)
, outputs a detour completion message to device 5 (step 4
09). If the detour connection is not possible, the connection is started again (step 1o8a).

Next, FIG. 4(C) shows the process of switching back from the telephone network to the dedicated line.

The dedicated line is constantly monitored by device 1 or device 2. When the dedicated line is restored (step 410), it is checked whether the return time after the dedicated line has been restored has been set in advance from the console of the device 5. 411), performs the process of switching back to the dedicated line (step 412), and after completing the switch back (after disconnecting the telephone line), outputs a switch back completion message to the device 5 (step 413). Furthermore, even if the dedicated line has not been restored, by inputting a command from the console of the device 5 (step 4I4), the telephone network is switched back to the dedicated line (step 412).
, outputs a switchback completion message to the device 5 (step 413).

FIG. 4(D) is a detailed flowchart of the telephone network connection, and shows the details of the process of step 408a in FIG. 4(B).

First, it is determined whether or not there is an empty calling boat in device 1 or device 2 (step 450), and if so, the empty boat for making the call is selected. Next, the device 1 or device 2 automatically connects to the telephone network (step 451), and logically switches from the leased line connection to the telephone line. If the connection is completed, the process ends, but if it is determined that the connection is not possible (step 4)
52), step 4 to output an abnormal message to the device 5.
53), the telephone line is automatically connected again (step 451).

FIG. 5 is a flowchart of the line control method in the event of a device failure in FIG. 1.

When device 2 or device 3 in FIG. 1 is at fault, the selector switch of device 7 is switched so that it can be connected to 1 or [phase] in FIG. 1 (step 500). The modem (with NCU) of device 1 is connected to device 4 via the telephone network (step 501).

FIG. 6 is a diagram showing the principle of line detour processing.

The connection between the devices (hostel device 4) is performed using a vC connection defined in X.25.

The terminal identification address (NSAP address) is set for the host and device 4.

Device 4 does not set the DTE address.

Between each device (hostle device 1 in Figure 1, devices 1 to 2,
devices 2 to 3, devices 3 to 4, etc.) are connected by DTE addresses.

(1) When connecting with a dedicated line (■ connection) N-1) Device 4
When sending a message from , the device 4 uses the terminal identification address T.
Set ool in the message.

(i-2) When entering the packet network, a DTE address BOI is automatically assigned.

(i-3) In the packet network, DTE address A is automatically
It is converted into OI and a message is sent to the host.

(i-4) The host uses the terminal identification address To in the message.
ol and confirms that the message is from device 4.

(U) When connecting via a detour line (connection (■)) (ii-1) When transmitting a message from the device 4, the device 4 sets the terminal identification address TOOL in the message.

(it-2) When entering the packet network, a DTE address BOI is automatically assigned.

(ii-3) Due to a change in line route, DTE address B
The OI is converted to the DTE address AO2, and the message is sent to the host.

(ii-4) The host uses the terminal identification address T in the message.
It recognizes ool and confirms that it is the message from device 4.

[Effects of the Invention] As explained above, according to the present invention, in a private network of an online information processing system,
In the event of a transmission line failure, automatic detour is performed to the backup line, and when the traffic volume exceeds a certain value, the flow of overflowing calls is automatically controlled to a separate line, and when the failure is recovered, the call is transferred from the detour line to the working line. When the overflow call is resolved, the detour control is automatically stopped and transmission continues using the working line, which prevents call loss and improves system reliability. can be achieved.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a line detour showing an embodiment of the present invention, FIG. 2 is a flowchart showing an outline of processing of the present invention, and FIG. 3 is a line control system between devices 1 and 2 in FIG. 1. FIG. 4 is a flowchart of the line control method between devices 1 to 3 and devices 2 to 3 in FIG. 1, FIG. 5 is a flowchart of detour processing in the event of device failure in FIG. 1, and FIG. FIG. 2 is a diagram showing the principle of line detour processing according to the present invention. 1.2,3: Device (exchange), lO: Host, 8°9.
11, 12: DSU, 4, 14: Transmission control device, 5: Network monitoring device, 6, 16: 15DN conversion device, 7.17: Line changeover switch, 28: Control unit, 29: Console, 3
0: Printer. Figure (Part 2) [Overview of device functions] Figure (Part 2) (B) Figure (Part 3) (c) Figure (Part 4) ff) 1 Figure (Part 2) (Bl Figure (Part 2) Part 1) Line control between devices 1 and 3 and devices 2 and 3 (Detour processing from ■ to 1.8'' and ■ to ■ in the line detour configuration diagram) Figure (Part 3) IC+ Figure (Part 4) Figure

Claims (2)

[Claims] (1) In an online information processing system in which multiple devices are sequentially connected via a dedicated line, at least two public lines are installed as backup lines in parallel to the dedicated line, and monitoring is performed between the devices. The bus is kept open at all times, and in the event of a failure of the dedicated line or equipment, the lower-level equipment notifies the monitoring equipment connected to the higher-order equipment via the monitoring bus, thereby starting the program of the monitoring equipment and using the dedicated line to When traffic congestion occurs, the overflowing call volume is automatically diverted to the backup line mentioned above, and when a failure occurs in the dedicated line between the above devices, automatic detour is performed using the backup line to prevent the failure of the above device. Sometimes, the backup line is diverted to the above-mentioned backup line, and when the failure of the above-mentioned dedicated line and equipment is recovered,
A transmission control method in a private network system, characterized in that the system automatically switches back to the dedicated line, and when the overflow call stops, the system automatically switches back to the dedicated line. (2) The monitoring device is equipped with a console operated by an operator, and commands can be input from the console even if the dedicated line and equipment do not fail or overflow calls occur. 2. The transmission control method in a private network system according to claim 1, wherein a detour connection to a backup line and a cutback to a dedicated line are performed.