JPS60160763A - Digital trunk redundancy constituting method - Google Patents

Abstract

PURPOSE:To attain surely switching to a spare at a high speed at a fault of a digital runk by providing an address converting circuit and a highway changeover circuit to a digital trunk module common section. CONSTITUTION:Digital trunks 70-73, a spare system digital trunk 74, common control section 6 and changeover switches 80-83 are mounted into a digital trunk module 4 while being divided into separate packages respectively. The common control section 6 is provided with an address converting circuit possible for control by the identical address at the changeover between a faulty digital trunk and a spare digital trunk and a highway changeover circuit. When a fault takes place in the digital trunk 73, it is detected by a controller 3, a command to switch to the common control section 6 is fed, which switches the trunk to the spare digital trunk.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a digital trunk redundant configuration method for a time-division switch, and particularly a digital trunk redundancy configuration suitable for a time-division switch that is small-scale and requires high reliability. Regarding the method.

[Background of the invention]

The digital trunk of a time division switch performs mutual conversion between bipolar and unipolar signals, code conversion frames,
It has nine functions such as multi-frame synchronization, elastic memory, fault detection, signal extraction, and signal insertion. However, since these trunks handle the transmission of multiplexed signals of 24 telephone channels, for example, When a failure occurs, its effects have a large ripple effect, and the traffic capacity of the entire digital trunk may be significantly reduced. (
7. Therefore, a redundant configuration method (where one or a small number of spare digital trunks are provided for a large number of normally used digital trunks, the normally used one that has failed is switched to the spare one, and the spare one becomes the regularly used one) For example, the n-1-1 redundant power formula) has been used in the past.

However, in the case of an n+1 configuration, for example, when a failure occurs in one digital trunk, a program-controlled control device switches the transmission path from the failed digital trunk to a spare digital trunk, and also sets the addresses for accessing those digital trunks. You need to convert it as well. Unfortunately, there are many unstable factors such as when the system is restarted during switching to the standby mode, and software is also required for switching the control device, which places a large burden on the control device.

[Purpose of the invention]

An object of the present invention is to provide a digital trunk redundancy configuration method that overcomes the technical difficulties of the prior art mentioned above and enables rapid and reliable switching to a standby system in the event of a digital trunk failure. .

[Summary of the invention]

The present invention is characterized in that a control address conversion circuit and a no-way switching circuit are provided in the common control section of the time division switch, and these hardwares are used to switch to a backup digital trunk in the event of a failure. It is something.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

In the figure, the electric splitter 1 has a time division switch 2° highway 90-96. Digital trunk modules (there are typically several, only one of which is shown in the diagram)
The digital trunks 70 to 75 are connected to each other through the common 5% wires 100 to 103 in the 4, and the output of each digital trunk 70 to 76 is connected to a changeover switch 80.
~83. A backup digital trunk 74 is also provided. The entire control of this time division switch is performed by a control device 6, and the common section 5 is controlled by a common control section 6V.
Controlled by c. Of these, the common section 5, each of the digital trunks 70 to 74, and each of the changeover switches 80 to 86 are mounted in separate cages.
By dividing the trunk (in this way), it is possible to replace a faulty digital trunk while the system remains in operation.

The switched common section 5 includes a control address conversion circuit, which is a feature of the present invention, and which enables control of the faulty digital trunk and the spare digital trunk in the same digital trunk module 4 to be performed using the same address before and after switching, and a highway. A switch circuit which is a feature of the present invention and which is used to perform switching is incorporated as hardware, and its operation is as follows.

In the normal state, the gateways 9b are connected to the digital trunks 7b via the common section 5, and the control addresses are set to the original control addresses of the digital trunks 7b (L''-0 to 4). ).In this state, for example, if a failure occurs in the digital trunk 76 and this is detected by the control device B, the control device 5 immediately switches the selector switch 86 to the backup digital trunk 4 via the common control unit 6. and outputs a command to the common section 5 to switch from the highway 93 to 104 and from the highway 94 to 103. With this command, the above-mentioned
The opposite switching circuit operates, and the input/output of the digital trunk 75 and that of the digital trunk 74 are switched. At the same time, the address translation circuit described above is activated by a command from the control device 6 to interchange the control addresses of the digital trunks 75, 74. Since these operations are executed by the nodeware, they are extremely fast, and the software of the control device 3 can greatly reduce its load by simply outputting the above commands, and after switching, calls to the digital 73 can be reduced. If done, it will automatically connect to the spare trunk 74 and continue operating the system.

On the other hand, since the digital trunk 76 where the fault occurred has been disconnected from the working line system, it can be accessed using the control address of the standby system, and if the test is performed using this address and the fault is determined, the system can remain in operation. You can replace that trunk.

Furthermore, if there is no failure as a result of the above test, it is assumed that there is a failure in the transmission path and is displayed.

〔Effect of the invention〕

As described above, according to this embodiment, if one digital trunk has a failure, generally in the case of a large group transmission line in PCM, 24 or 30 lines (channels) will be out of service. The service can be started by switching to the standby digital trunk using nodeware control. Furthermore, since the address of the switched spare digital trunk is converted so that it can be accessed directly to the same address as the failed trunk, there is almost no software burden on the control device. Moreover, since testing and replacement of faulty digital trunks are separated from the active system, they can be performed without interrupting system operation or degrading service. Especially when the scale of the time division switch is small, the cost of the hardware that constitutes the no-way switching circuit and the control address conversion circuit is not a particularly big problem, so it is extremely effective in improving the reliability of small-scale systems. It is.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the digital trunk redundancy configuration method of the present invention. 2... Time division switch, 6... Control device, 4... Digital trunk module, 5...
...Digital trunk module common section 6.
... Common control section, 70-73 ... Digital trunk, 80-8
5... Changeover switch, 74... Spare digital trunk. 11 swords

Claims (1)

[Claims] Input switching means for switching input paths from the time division switch of each digital trunk including a backup time division switch;
By providing an output switching means for switching the connection between each output terminal and the output of each digital trunk, and a control means having a control function for the input switching means and output switching means and a function for detecting the occurrence of a failure in each digital trunk. In a digital trunk redundancy configuration method that switches the digital trunk to a spare digital trunk when a failure occurs in one of the digital trunks, at least each of the digital trunks and the output switching means are separated from each other. It is implemented in a package so that it can be replaced individually, and when the control device detects a fault in the digital trunk in operation and outputs a switching command, it connects the input/output route between the faulty digital trunk and the backup digital trunk. A highway switching circuit with a hardware configuration that controls input and output switching means to operate and switch, and even after switching by this circuit, the same control address as the control address that was accessing the faulty digital trunk described in 1 above before switching. In order to access the switched backup digital trunk, a control address conversion circuit having a hardware configuration is provided that mutually exchanges the control addresses set respectively before the occurrence of the failure on the failed digital trunk and the backup trunk by the switching command. A digital trunk redundancy configuration method characterized by: