JP2536254B2 - Transmission control method in private network system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention, in an online information processing system, diverts to a backup line when the transmission line of a private network (intra-company communication network) fails, and keeps the traffic volume constant. When the volume exceeds the limit, the transmission control to prevent the loss of the call is automatically performed by controlling the flow of the overflow call to another line, and at the time of failure recovery, the switching back control from the bypass line to the working line and the overflow are performed. When the call is cleared,
The present invention relates to a transmission control method in a private network system capable of automatically controlling the detour control so as to continue the working line.

[Conventional technology]

Conventionally, in a multiplex transmission line, multiple routes are used to improve reliability, and when a failure occurs, the configuration of the transmission line is switched to minimize the influence on the transmission network. As a method of selecting a backup transmission line, there are direct multi-route switching for switching another transmission line parallel to the working transmission line as a backup, and detour route switching by a transmission line passing through another station.

In addition, in order to secure the required line availability in the FM radio repeater microwave line, a line switching device is installed at both end stations, and a continuous pilot signal for radio line monitoring from the transmitting end station to outside the upper band of the baseband. The line is switched by the line switching device when the line end is detected continuously at the receiving terminal and the line failure is detected due to the disconnection of the signal (“Electronic Communication Handbook” March 30, 1979, Auto Co., Ltd.) Issued, p
p.1003-1004, pp.1081-1082).

However, the online information processing system does not automatically switch to the backup line in the event of a failure. In addition, the overflow call is also discarded.

[Problems to be Solved by the Invention]

In the conventional online information processing system, the automatic backup control function has become mainstream. That is, when the transmission line fails, the failure of the line is displayed on the 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, when the failure of the line is recovered, the line is automatically or manually switched back to the working line and the data transmission is continued.

However, in an online system that propagates important data, such as in a financial institution, switching at the time of failure or discarding data due to overflow causes reduction in reliability.

An object of the present invention is to solve such a conventional problem, constantly monitor traffic volume and monitor failure, automatically bypass only an overflow call, and automatically switch to a bypass line at the time of failure, An object of the present invention is to provide a transmission control method in a highly reliable private network that can minimize call loss by automatically switching back at the time of recovery.

[Means for solving the problem]

In order to achieve the above object, in the transmission control method in the private network system of the present invention, in the transmission control method in the online information processing system in which a plurality of devices are sequentially connected via a dedicated line, The public line is installed as a backup line, and a monitoring path is arranged between the plurality of devices, and the monitoring path is connected to the monitoring device attached to the higher-level device. By monitoring, when a failure occurs in the dedicated line and / or the device, and / or when traffic congestion occurs in the dedicated line, the total call volume or the overflowed call volume is diverted to the backup line, When the leased line or the device fails, and / or the overflow call goes away, When switching back to the dedicated line and the monitoring device inputs a command for the detour prevention time zone in advance, even if the failure of the dedicated line or the device is recovered after detouring to the backup line, Within the detour suppression time, the entire call volume is transmitted through the backup line without switching back to the dedicated line.

Further, the above-mentioned monitoring device, even if a failure occurs in the private line or the device or an overflow call does not occur, by issuing a command, makes a bypass connection from the private line to the backup line and / or the backup line. It is also characterized in that the connection is switched back to the dedicated line.

[Action]

According to the present invention, when a transmission line fails, a backup line is automatically diverted to a private network of an online information processing system, and when a traffic volume exceeds a certain value, an overflow call is generated. Flow control for transferring to another line is automatically performed to prevent call loss. In addition, when the failure is recovered, switching control is automatically performed from the bypass line to the working line, and when the call of the overflow call is resolved after a certain period of time, the bypass control is stopped and the data is transmitted by the working transmission line. To continue.

Therefore, the function to constantly monitor the state of the line in the network, the function to detect overflow, the function to bypass the overflow call, the function to switch to the bypass line when there is a failure, and the function to operate from the bypass line when the overflow call disappears It has a function to switch back to a line, a function to switch back to a working line when a failure is recovered, 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, 13 are device 1, device 2, device 3
Then, a packet switch that performs packet message distribution, flow control, and detour control.
Is a device 5, which is provided with a control unit 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 devices equipped with an ISDN (Integrated Digital Communication Network) conversion function.
Is a device 7, which is a line changeover switch. 8,9,11,1
2 is a line terminating device, and 13,15,18,19,20,21,22,23,24,25 are modems (modulation / demodulation devices).

Further, is a dedicated line (private network), is a bypass line (public network, is ISDN network, other is a telephone network), and is a connection line that is a part of the bypass line.

A monitoring bus is provided between the devices, and when a failure occurs in the line and the device, the lower device notifies the upper device and finally the device 5. The device 5, when a failure is detected and when an overflow call is detected, the device 1, 2, 3,
Directs detour control and flow control to 13 (packet switch).

For example, when an overflow call occurs, an ISDN network line can be selected as a bypass line for the line. A telephone network line can be selected as a bypass line for the line. A telephone network line can be selected as a bypass line for the line. further,
A telephone network line can be selected as a bypass when the device 2 fails. In addition, as a bypass when the device 3 has a failure, it is possible to select a connection line of the telephone network and a connection line of the telephone network. In addition, as a bypass when both the device 2 and the device 3 are in failure, the connection line of the telephone network can be selected.

FIG. 2 is a processing flowchart in FIG.

As described above, the monitoring bus is always established between the devices shown in FIG. 1, and when a line or device failure occurs, the lower device notifies the upper device. That is, device 4 → device 3 →
Notification is made in the route of device 2 → device 1 → device 5. When the fault and the overflow call are notified, the program in the monitoring device 5 is activated, and the flow shown in FIG. 2 operates to automatically instruct the transmission control device to set the terminal identification address or to change the switch. By operating, the detour connection is made to the backup line.

When an abnormality occurs, it is first judged whether or not there is a line failure of the leased line (step 200), and if there is a high-speed digital line failure between the devices 1 and 2, an automatic detour is performed by the ISDN network (step 201, 203). If there is a failure between the device 1 to the device 3 or between the device 2 and the device 3, automatic detour is performed by the telephone network (steps 202 and 204).

On the other hand, when the congestion of the traffic occurs in the high-speed digital lines of the devices 1 and 2 when the line failure of the leased line does not occur, the overflowed call volume is detoured in the ISDN network (step 20).
5, 203).

If the device 2 or the device 3 is faulty, the telephone network detour is performed (steps 206 and 207). The failure of the apparatus 2 is detected by the apparatus 1, the failure of the apparatus 3 is detected by the apparatus 2, and each is notified to the upper apparatus (the apparatus 1).

The operation will be described below with reference to a detailed flowchart. FIG. 3 shows a case of a line failure between the device 1 and the device 2 in step 203 of FIG. 2 and a case of occurrence of congestion between the device 1 and device 2 in FIG. In the case of a line failure between the two, in step 207
The case of failure of the device 2 or device 3 will be described with reference to FIG.

FIG. 3 is a flow chart of line control between the device 1 and the device 2. That is, the procedure of the detouring process from to in FIG. 1 is shown.

FIG. 3 (A) is a process when a leased line has a line failure and congestion occurs in the leased line, and FIG. 3 (B) is a process when an ISDN network line failure occurs while using ISDN. (C) is the process of switching back from ISDN to the leased line at the time of recovery, and Fig. 3 (D) is IS
The detailed processing for making a bypass connection to the DN network is shown.

First, in FIG. 3 (A), if there is a line failure in the leased line (step 300), a message is output to the device 5 (step 301), and a bypass connection is made to the ISDN network according to an instruction from the device 5 (step 301a). ). Then, the detour connection end message is output to the device 5 (step 302). In addition, CCITT's X.25
Although the throughput class defined in 1 is preset, when the total throughput class 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 the instruction from the device 5, the device 5 is connected to the ISDN network to bypass only the overflow call (step 304a). Then, the detour completion message is output to the device 5 (step 305).

Even when the total throughput class does not exceed the specified value, it is possible to bypass the ISDN network by the instruction from the device 5. At this time, by issuing a command from the console of the device 5 (step 306), the leased line is bypass-connected to the ISDN network (step 306a). A detour completion message is output to the device 5 (step 307).

Next, in FIG. 3 (B), if a line failure occurs in the ISDN network while the ISDN network is in use, a detour connection is made again to the ISDN network (step 308a), and if the connection is completed (step 30).
8), output a detour completion message to the device 5 (step 309).

Next, FIG. 3 (C) shows a process of switching back from the ISDN network to the dedicated line. In this case, the device 1 constantly monitors the dedicated line.

When the leased line is restored (step 310), it is checked from the console of the device 5 whether or not the return time after restoration of the leased line has been done in advance. Switchback processing is performed (step 312), and after switching back (ISDN line disconnection), device 5
Outputs the switchback end message to (Step 31
3).

Even if the leased line is not restored, by issuing a command from the console of device 5 (step 314), ISDN
Switch back from the network to the dedicated line (step 312),
Output the switchback end message to the device 5 (step
313).

In addition, even if the leased line is not restored and no command is input from the device 5, the traffic congestion causes the IS
When only the call volume overflowing on the DN line is bypassed and the call overflowing on the ISDN line disappears (step 315), the ISDN network is switched back to the dedicated line (step 312), and the device 5 is switched. Output the return end message (step 31)
3).

Also, when there are still calls over the ISDN line,
Continue until this becomes '0' (step 316).

Next, FIG. 3 (D) is a flow showing the connection method of the ISDN network, and includes steps 301a, 304a, 306a,
The details of each process of step 308a in FIG. 3B are shown.

First, since the device 1 has a plurality of ports, an empty port for transmission is selected (step 350). Next, the device 1 automatically connects to the device 2 through the ISDN network (step 351), and the dedicated connection line is logically switched to the ISDN connection. Next, if the connection is completed, the process ends,
If it is determined that the connection is impossible (step 352), an abnormal message is output to the device 5 (step 353), and the ISDN connection is automatically made again (step 351).

FIG. 4 is a flowchart of the line control system between the devices 1 to 3 and the devices 2 and 3 in FIG. That is, the procedure of the bypass process from to in FIG. 1 is shown.

In FIG. 4 (A), if the leased line is a failure (step 400), a failure message is output to the device 5 (step 401), and after making a bypass connection to the telephone network (step 402),
Output a detour completion message to the device 5 (step 40).
3).

Further, even if the leased line is not a failure, the command is input from the device 5 (step 404) so that the device 5
After outputting the detour start message to (step 405),
A detour connection is made from the dedicated line to the telephone network (step 406), and a detour completion message is output to the device 5 (step 40).
7).

Next, in FIG. 4 (B), when a telephone network line failure occurs while using the telephone network, a bypass connection is again made to the telephone network (step 408a). Once connected (step 408),
Output a detour completion message to the device 5 (step 40).
9). If the bypass connection is not possible, the connection is started again (step 408a).

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

The dedicated line is constantly monitored by the device 1 or 2. When the leased line is restored (step 410), it is checked from the console of the device 5 whether or not the return time after the restoration of the leased line has been set in advance, and if it has been set, if a certain time has elapsed after restoration (step 411), switching back to the dedicated line is performed (step 412), and after switching back is completed (after the telephone line is disconnected), a switching back completion message is output to the device 5 (step 413). Even if the leased line is not restored, a command is input from the console of the device 5 (step 414) to switch back from the telephone network to the leased line (step 412), and switch back to the device 5 is completed. A message is output (step 413).

FIG. 4D is a detailed flow of telephone network connection,
Details of the process of step 408a in FIG.

First, it is determined whether or not the device 1 or device 2 has an available outgoing port (step 450), and if there is, an empty port for outgoing is selected. Next, the device 1 or 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 impossible (step 45).
2) Output an error message to the device 5 (step 45
3) Then, automatically connect the telephone line again (step 45).
1).

FIG. 5 is a flow chart of the line control method at the time of device failure in FIG.

When device 2 or device 3 in FIG.
The changeover switch of the device 7 is changed so that it can be connected to or of FIG. 1 (step 500). The modem (with NCU) of the device 1 connects to the device 4 through the telephone network (step 501).

 FIG. 6 is a diagram showing the principle of the line detouring process.

The connection between the devices (host to device 4) is performed by the VC connection specified in X.25.

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

 Device 4 does not set the DTE address.

The respective devices (host to device 1, device 1 to device 2, device 2 to device 3, device 3 to device 4, etc. in FIG. 1) are connected by a DTE address.

(I) When connecting via a dedicated line (connection) (i-1) When transmitting a message from the device 4, the device 4 sets the terminal identification address T001 in the message.

(I-2) Automatically enter DTE address B when entering the packet network
01 is given.

(I-3) In the packet network, it is automatically converted into the DTE address A01 and the electronic message is transmitted to the host.

(I-4) At the host, the terminal identification address T001 in the message
Is recognized and it is confirmed that the message is from the device 4.

(Ii) At the time of connection via the detour line (connection) (ii-1) When transmitting a message from the device 4, the device 4 sets the terminal identification address T001 in the message.

(Ii-2) DTE address B is automatically entered when entering the packet network
01 is given.

(Ii-3) From DTE address B01 due to change of line route
Converted to DTE address A02, and sends a message to the host.

(Ii-4) At the host, the terminal identification address T001 in the message
Is recognized and it is confirmed that the message is from the device 4.

〔The invention's effect〕

As described above, according to the present invention, in a private network of an online information processing system, an automatic detour to a backup line is performed when a transmission line fails, and an overflow call is separated when a traffic volume exceeds a certain value. Automatic flow control to the line, automatic recovery control from the bypass line to the working line when the failure is recovered, and automatic stop control when the overflow call is resolved and transmission by the working line Since it is continued, the call loss can be prevented and the reliability of the system can be improved.

[Brief description of drawings]

FIG. 1 is an overall block diagram of circuit detour showing an embodiment of the present invention, and FIG. 2 is a flow chart showing an outline of processing of the present invention.
FIG. 3 is a flow chart of a line control system between the devices 1 and 2 in FIG. 1, and FIG. 4 is a device 1 and device 2 in FIG.
FIG. 5 is a flow chart of the line control system between the device 3 and the devices 2 to 3, FIG. 5 is a flow chart of the detour process at the time of the device failure in FIG. 1, and FIG. 6 is a diagram showing the principle of the line detour process of the present invention. . 1,2,3: Device (exchange), 10: Host, 8,9,11,12: DSU, 4,
14: Transmission control device, 5: Network monitoring device, 6, 16: ISDN conversion device,
7, 17: Line selector switch, 28: Control unit, 29: Console, 3
0: Printer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takeshi Nishikawa Takeshi Nishikawa 1-26-5 Toranomon, Minato-ku, Tokyo NTT DATA Telecommunication Corporation (72) Inventor Ryoichi Takahashi Chuo-ku, Osaka City, Osaka Prefecture Kinomi Bank, Ltd. (56) References JP-A-62-39937 (JP, A) JP-A-2-43844 (JP, A) JP-A-60-218956 (JP, A) ) JP-A 2-135839 (JP, A) JP-A 64-5245 (JP, A) JP-A 2-78345 (JP, A) JP-A 2-116241 (JP, A) JP-A-2- 82840 (JP, A) JP-A-2-43850 (JP, A)

Claims (2)

(57) [Claims] 1. A transmission control method in an online information processing system in which a plurality of devices are sequentially connected via a dedicated line, wherein a public line is installed as a backup line in parallel with the dedicated line and the plurality of devices are provided. A monitoring path is arranged between them and the monitoring path is connected to a monitoring device attached to a host device. The monitoring device constantly monitors the monitoring path to check for a failure in the leased line and / or the device. When it occurs, and / or when traffic congestion occurs on the dedicated line, the entire call volume or the overflowed call volume is diverted to the backup line, and when the failure of the dedicated line or the device is recovered, and / or Alternatively, when the overflow call disappears, the line is switched back to the dedicated line, and the monitoring device inputs a command for the detour prevention time zone in advance. Even if the failure of the dedicated line or the device is recovered after the detour to the backup line, the backup line can be used without switching back to the dedicated line within the detour suppression time. A transmission control method in a private network system, which is characterized by transmitting a total call volume. 2. The transmission control method in a private network system according to claim 1, wherein the monitoring device inputs a command even if a failure occurs in the leased line or the device or an overflow call does not occur. Allows you to make a bypass connection from a dedicated line to a backup line,
And / or a transmission control method in a private network system, characterized in that the backup line is switched back to the dedicated line.