JPS6219119B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control system for an electronic exchange under storage program control.

In recent years, the full-scale introduction of storage program-controlled electronic switching equipment has been underway in Japan and other developed countries around the world. However, since the storage program controlled electronic switching system is a typical common control switching system, the common control section accounts for a high proportion of the cost, especially when implemented in small capacity switching equipment.
The disadvantage was that the cost per line was relatively high.

The present invention completely converts the storage program control device into a building block and decentralizes it in correspondence with the expansion unit of the call switch network.
The object of the present invention is to realize a storage program control type electronic exchange that can economically cover an extremely wide capacity range from small capacity to large capacity with one type of exchange.

Accordingly, in the conventional system, a storage program control device for controlling call switching for a group of lines accommodated in a communication path module of a fixed capacity, which is a unit of expansion of a communication path, is provided, and a storage program control device for each module is provided. An inter-processor communication means is provided between the processors, and exchange control information necessary for connection and restoration of lines housed in different modules that are mutually junctor-coupled is mutually exchanged via the inter-processor communication means. By adopting this method, a switching system with any desired capacity can be realized by stacking up the necessary number of unit modules in a building block manner.

In contrast, the present invention further expands the above technology, and specifically extends the configuration method and control method of such exchanges to general subscriber line converters and subscriber line/interruption line merged exchanges. It is.

As a result, it is possible to realize a program-controlled electronic exchange with very low fixed costs that are not related to exchange capacity.

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

Figure 1 is a block diagram showing an example of a distribution switch circuit network that is completely constructed into building blocks.
This is an example of a building block of a time division switch network arranged in a format called an MGM array. That is, by dividing and distributing the n.times.n square spatial switch grid into n groups of n.times.1 switch grids corresponding to modules, which are expansion units, the building blocks of the communication path are planned. In the figure,
MCTL and GCTL are control memories for the time switch M and space switch G of each module, respectively. Therefore, in Fig. 1, if the time division multiplicity of the receiving highway and the sending highway is N, the capacity of one module, that is, the expansion unit capacity is N lines, which are stacked up to a maximum of n modules in n steps, as shown in the figure. By connecting via the junction highway, a distribution switch network of final capacity N×n lines is obtained.

Here, the first feature of the present invention is to add a small processor with processing power equivalent to the capacity of the N lines to the distribution switch module that is completely structured as a building block as described above. The objective is to perform call processing on the lines accommodated in the module as much as possible. Therefore, connections between the lines accommodated in different modules are performed while transmitting and receiving necessary exchange control information between the processors of each module using interprocessor communication means.

Similar to this concept, there is a method of configuring a large capacity station by connecting multiple independent exchanges of the same type or different types as a multi-unit. However, in this case, independent exchanges are housed in the same office building, and the feature is that the multiple exchanges are connected to each other via ordinary inter-office or similar trunks. On the other hand, the example shown in FIG. 1 differs in that the distribution switch modules are connected to each other by junction highways, which are internal connection lines of the switch circuit network. That is, each module is part of a single switch.
Therefore, communication between the processors of each distribution switch module described above is different from communication between multiple exchange controllers in a multi-unit station, that is, communication using the normal inter-exchange signaling method. is a feature.

The above is a case of an interrupted line exchange consisting only of a distribution switch circuit network, but the second feature of the present invention is that a subscriber concentrator switch is added to the above distribution switch circuit network, and a subscriber line exchange or subscriber line exchange line/
When configuring a disconnected line merging switch, even if it supports a subscriber concentration switch with a certain capacity, a small processor with processing power equivalent to that capacity is added, and a distribution switch that accommodates the processor and the subscriber concentration switch is added. An inter-processor communication means is also provided between the processors of the circuit network module, and necessary exchange control information is exchanged using the inter-processor communication means when establishing a call connection between subscribers and between subscribers and input/output lines. It's about doing it while doing it.

FIG. 2 is an example in which a necessary storage program control device is added to support the distribution switch module shown in FIG. 1, assuming the case of an interrupted exchange. In the figure, M and G in each module are the time switch M and space switch G explained in Figure 1 earlier, and are simplified in this figure, but the interconnection of each module communication path is the same as in the previous figure. As shown in FIG. 1, this is done via the Jankuta Highway Bus. In addition, the VCU and DTI in the figure are an analog/digital mutual converter for accommodating an analog line, and a synchronization device for accommodating a digital inter-office transmission line, respectively, and input/output to and from these. is converted into an appropriate time division multiplexing degree N by the multiplexing/demultiplexing circuit MPX in each module and interfaced with the time switch M.
The above is an outline of the configuration of the communication path system, while the configuration of the control system is as follows. SPR in Figure 2
is a signal processing device that processes the transmission and reception of line signals corresponding to each accommodation line inserted at a specific time position on the communication highway via MPX, or the transmission and reception of multifrequency signals and signal sound sources for various conversions. It controls the service circuit SVC that performs the following operations.
Further, MP is a distribution switch module processor, that is, a storage program control device provided for each distribution switch module. Here, the MPs of each module are connected to each other via an interprocessor communication bus, and exchange necessary exchange control information is exchanged with each other via this. Specifically, MP
Microprocessors, etc., which have been making rapid progress in recent years, have made rapid progress in recent years.
This is realized by connecting buses, etc.

Note that the OMP in FIG. 2 is a service processor for processing tasks not directly related to individual call processing, such as man-machine interfaces for maintenance and application.

FIG. 3 shows the flow of switching connection processing when both the communication path system and the control system are completely constructed into building blocks. In the figure,
SPM is a general term for the distribution switch circuitry part of the module configuration explained in Fig. 2, and the others, SVC, SPR, and MP, are as already explained in Fig. 2. Also, with respect to the center of the figure, the left side is a module that accommodates an incoming line, and the right side is a module that accommodates an outgoing line. The outline of the processing flow shown in FIG. 3 will be explained below.

The module that accommodates the incoming line is currently
When the SPR detects a call, it captures an empty selected digit receiving circuit in the SVC of its own module. When the SPR receives the selected number, it sends the result to its own module.
Notify MP. The MP determines the outgoing route by analyzing the selected numbers, and then refers to the table it owns to find out the module that accommodates the outgoing line to the desired outgoing route. When one of the modules is identified by accommodating the outgoing line, it is sent to the MP of that module via the interprocessor communication bus.
It inquires whether there is any availability on the outgoing line to that outgoing route. If there is a free outgoing line, a connection path is selected between the MP of the module accommodating the incoming line and the module holding the free outgoing circuit. For channel matching processing for this purpose, refer to Figure 1 and refer to Figure 1.
The time slot occupancy information at the point is notified to the incoming line MP through inter-processor communication, and the incoming line MP
is performed by performing a logical product between this and the time slot vacancy information at point A on its own junker highway. In reality, the MP on the outgoing line does not send all of its own time slot occupancy information at once, but repeatedly sends parts of it one by one until channel matching is successful. When the channel matching is completed and the connection route is determined, the selected numeric information to be sent to the downstream station is sent from the incoming line MP to the outgoing line MP, and a request is made to the downstream station to start up. As a result, when the outgoing line MP finally detects the called party response from the downstream station and this is notified to the incoming line MP, both MPs actually use the previously selected connection route. settings and enter the call phase. The disconnection and restoration of the communication path upon termination of a call is similarly performed by communication between both MPs on the incoming and outgoing line sides.

The above is an explanation of the configuration of an interrupted line exchange consisting only of distribution switch modules and its control system.

Hereinafter, a method of extending the present invention to a subscriber line exchange and a subscriber line/interruption line merging exchange will be explained based on specific examples.

FIG. 4 shows the configuration of the most general-purpose subscriber line/interruption line merging exchange. Most of the right half of the figure is the exact structure of the interruption exchange, ie, the distribution switch system, already explained in FIG. The difference from Figure 2 is that the control data link of the subscriber concentrator switch, which will be described next, is branched/distributed on the time division multiplex highway between the exchanges.
Circuit D/I (Dropper/
Inserter) is added.

The left side of FIG. 4 shows a newly added subscriber concentration switch system. In the figure, LC (Line,
Circiit) is an interface circuit for accommodating subscriber terminals in a subscriber concentration switch, and has functions such as detecting calls from subscribers. LCSW (Line
A concenhrator switch is a switch circuit network for concentrating subscriber lines.In this embodiment, a space-division type concentrator switch is assumed, but even if other types of concentrator switches are used, the following explanation will not apply. Essentially nothing has changed. Subscriber voices concentrated by the LCSW are digitally encoded and digitally multiplexed by a VCU (Voice Converter Unit) and interfaced with the multiplexer (MPX) of the parent distribution switch module.

On the other hand, LCP (Line Concentrmtor Processor)
The LCSW is controlled by a small processor (storage program control device) installed to support a fixed capacity subscriber concentration switch (LCSW). LCP is generated through the control drop/insertion circuit (D/I) placed after the subscriber concentrator switch VCU and the signal drop/insertion circuit (D/I) added in the distribution switch module. It is connected to the module processor (MP) of the parent distribution switch module by a data link provided by the LCP and the LCP/MP, and exchange control information is exchanged between the LCP and MP. In the figure, the subscriber concentration switch is located near the distribution switch (for example, in the same building).
However, if the synchronizer DTI explained in relation to Figure 2 is installed after the D/I of the concentrator switch and before the MPX of the distribution switch, the concentrator switch can be installed remotely. It is possible. However, even in that case, the exchange control flow described below is essentially the same.

In addition, LSVC (Line Concentrator Service)
Cireuits are service circuits for subscriber concentrators that transmit dial tones, receive subscriber dialing information, transmit callers or transmit busy tones, and so on.

FIG. 5 shows the flow of conversion and connection processing in such a configuration. The example shown in the figure is an example of a connection within the own station, and when compared with the case of an interrupted connection in FIG. 3, it can be seen that a concentrator switch processor (LCP) is located at the position of the processed signal processor (SPR). As can be easily analogized, in the case of other types of connections, e.g. outgoing/outgoing connections or incoming/outgoing connections, both incoming and outgoing module processors (MPs) interface with the LCP on one side and the SPR on the other. do.

The flow of processing in the case of intra-station connection will be described below with reference to FIG.

When one of the subscribers accommodated in the current concentration switch makes a call, this is detected by the LCP via the LC. The LCP has subscriber data about the subscribers accommodated in this concentrator switch, according to which it is possible to analyze subscriber classes, i.e. general/public distinction, dialing type (rotary dial, push button, etc.). )
A dial receiving circuit matching the subscriber is acquired and connected.
At the same time, a dial tone is sent to the calling subscriber.

When receiving the selected number information from the subscriber, it checks whether the outgoing line to the parent distribution switch module is idle, and if there is an idle line, it captures it. at the same time
The LCP transfers the received selective digit information to the parent distribution switch.
Report to the module MP and notify them that a call has been made. MP analyzes the selected numbers in the same way as in Figure 3. The analysis here is the same process as in the case of Figure 3 above, with translation up to the area/city code. As a result, if this call is found to be an intra-office connection call, the MP determines the distribution switch module that accommodates the called subscriber. This judgment assumes that the capacity of one distribution switch module is several thousand subscribers.
For example, this can be done by analyzing only the local area code. When the other party's distribution switch module is determined, the MP of this module is
Only the called subscriber number (for example, the last four digits) with the local number removed is notified. Based on this, the terminating MP determines which subscriber concentration switch in its module accommodates the called subscriber, and checks whether the circuit connecting to the subscriber concentration switch is blocked. If there is a free line, it is captured and the line concentration switch is notified of the called subscriber's number along with the captured line number. The called subscriber concentrator switch analyzes the called subscriber's incoming call based on the subscriber number, and sends out a ringing tone based on the result. When the called party answers,
The called LCP detects this, sets up a call path within the concentrator switch, and also notifies the parent MP of the called party's response. The results are further added to the originating MP and the originating LCP.
will be notified, a call path will be set, and the call will begin. The disconnection and recovery of the communication path upon termination of a call is similarly performed by interprocessor communication among the originating LCP, originating MP, terminating MP, and terminating LCP.

Let us now consider the amount of local data required for each processor to perform conversion processing.

As can be seen from the above explanation, (1) the LCP of the originating and terminating subscriber concentrator switch has subscriber data for the subscribers accommodated in the concentrator switch; There is no duplicate storage of data. (2) When the MP of each distribution switch/module receives a call, it only needs to be able to determine from the subscriber number the concentration switch number under its own umbrella that accommodates the called party, and the amount of data for this is within its own umbrella. Since it is only for subscribers, it is possible to configure the entire system to avoid duplication of data. (3) Since the same translation table for searching the called party or the distribution switch module where there is an outgoing line from the area/local area code is redundantly installed in all MPs, data storage is overloaded. However, since this is a relatively small amount of data, it is not a major problem.

As explained above, the present invention completely converts not only the concentration switch system and distribution switch system of the exchange, but also the corresponding storage program control system into building blocks and decentralizes them to correspond to the expansion unit of the call system. It is possible to realize a storage program controlled electronic exchange with low cost. As a result, it is possible to realize an electronic exchange that can economically cover a wide range of capacities from small to large capacities.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an example of a time division switch circuit network that is completely structured into building blocks. 3 is a diagram showing the flow of switching processing in the switch having the configuration shown in FIG. FIG. 5 is a diagram illustrating the flow of exchange processing in the exchange having the configuration shown in FIG. 4, taking as an example the connection within the own station. M...Time switch, G...Space switch,
VVCU……Analog/digital mutual converter,
DIT...synchronization device, MPX...multiplexing/demultiplexing circuit, SPR...signal processing device, SVC...service circuit, MP...distribution switch/module storage program device, OMP...service processor,
D/I...control data link branch/insertion circuit,
LC...Subscriber circuit, LCSW...Subscriber concentration switch, LCP...Subscriber concentration switch control storage program device, LSVC...Subscriber concentration switch service circuit.

Claims (1)

[Scope of Claims] 1. A storage program control device (processor) comprising a plurality of distribution switch modules accommodating lines of a certain capacity, each distribution switch module performing call switching control for a group of lines accommodated in its own module. The processors of each distribution switch/module are connected by inter-processor communication means, and the distribution switches/modules are connected by a junction highway, which is an internal connection line of the switch circuit network, and are housed in different distribution switch/modules. A subscriber line concentration system that concentrates a certain capacity of subscriber lines in an electronic exchange that performs connection processing by mutually transmitting and receiving exchange control information necessary for mutual connection and restoration of lines that are connected to each other via the inter-processor communication means. a subscriber line switch module comprising a subscriber line switch and a concentrator processor that has data regarding the subscribers accommodated in the subscriber line switch and performs call switching control for these subscriber lines; The signal drop/add circuit provided in the line switch module and the signal drop/add circuit provided in the distribution switch module allow each processor to communicate with each other via the control data link on the time division multiplex highway connecting these modules. The concentrator processor sends selected numeric information from the calling subscriber to the processor of the distribution switch module, and the processor of the distribution switch module The selected numeric information is analyzed, and if the call is an intra-office connection call, the distribution switch module in which the called subscriber is accommodated is extracted, and the processor of the corresponding distribution switch module selects the called subscriber based on the selected numeric information. determines the subscriber concentration switch in which the subscriber concentration switch is accommodated, notifies the subscriber concentration switch of the incoming subscriber number along with the captured line number, and the subscriber concentration switch performs call path setting processing. Exchange control method.