JPS5829037B2 - Distributed processing method for electronic exchanges - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a distributed processing system for electronic exchanges.

Figure 1 shows the configuration of the most common known electronic exchange in which the control system of the exchange is configured with one processing unit. In Figure 1, LC is a subscriber circuit, TRK is a trunk circuit, and NW is between LC and TRK. These are normally called communication path equipment.

Further, the CC is a central processing unit that realizes switching functions by controlling these communication path devices.

In such a configuration, since the entire exchange is controlled by one CC, a high-performance processing device is usually required.

Therefore, especially in so-called low line area exchanges with a small number of subscribers, the price of the central processing unit accounts for a large proportion of the price of the entire exchange, making it difficult to configure the exchange economically. From the point of view of the program that realizes this, it is necessary to control the entire switching system with one program system, and one program system has a huge amount of data, which poses problems such as difficulties in program design and maintenance. there were.

FIG. 2 shows the configuration of a control system of a generally known distributed control type electronic exchange, in which the control system of the electronic exchange is composed of a plurality of relatively low-performance microprocessors.

In the figure, PL is a communication line system device of an electronic exchange,
a processing device that mainly shares control regarding the subscriber circuit LC;
PT is a processing device that also shares control regarding trunk circuit TRK, and PN is a processing device that also shares control regarding communication path NW. PC receives information from each of the processing devices PL, PT, and PN, and processes this information. This is a processing device that has the function of analyzing the information, obtaining information that instructs communication path equipment to perform various operations, and transmitting this information to the PL, PT, and PN.

In this configuration, the various functions that realize the electronic exchange are PL.

Since it is distributed to each processing device such as PT, PN, and PC, each processing device is generally composed of a relatively low-performance, low-cost microprocessor, etc., and also controls communication path equipment. PL, PT.

The number of each processing device of the PN is small for a low-line area exchange with a small number of lines, and it is possible to have a configuration in which the number of these processing devices increases as the number of lines increases. P.L., P.T.

Since the functions shared by each processing device, PN and PC, are relatively grouped and limited, the program for realizing them is also small-scale. In this configuration, PL, PT, P
The most typical example of the division of functions among the N and PC processing devices will be described in more detail.

That is, PL detects call origination/disconnection signals by monitoring the subscriber circuit LC, counts dial pulses, receives digits, sends out calling signals by controlling the subscriber circuit LC, etc. For the call trunk TRK, it detects activation/disconnection signals, sends activation signals, receives dial pulses, sends them, etc., and also PBOR (not shown).
It has functions such as receiving PB numbers for T (PB number receiving trunk) and sending out MP number signals for MFO8T (MF number sending trunk, not shown).

The PN has a function of closing and releasing designated communication paths based on commands from the PC.

In addition, when the PC receives various information received from the PL and PT, for example, call information of a subscriber from the PL, it obtains the calling class of the received caller.For example, when the call is from a PB telephone, Select a free PBORT, select a free channel connecting the calling party and the PBORT, learn the processing device PT in charge of controlling the selected PBORT, and
Sends a command to T to start receiving numbers on the PBORT, learns the processing device PN in charge of controlling the selected communication path, and sends the selected communication path information to the PN. , closes the communication path.

For example, when receiving numeric information dialed by a subscriber from the PL, the received digits are analyzed, and as a result, if the call is an outgoing call to another station, an empty call is selected from the outgoing trunk to the other station. Select a trunk, check the signaling system of the outgoing trunk, and if it is, for example, the MF signaling system, select an empty MFO8T from among the MFO8Ts and set up an empty call to connect the calling party and the outgoing trunk. As described in the example in which the subscriber's calling information is received by selecting an empty communication path connecting the outgoing trunk, the outgoing trunk, and the MFO 3T, the P in charge of controlling the outgoing trunk MFO 8T and the empty communication path
This processing device has functions such as transmitting the numbers dialed by the caller to a predetermined other station by sending predetermined information to the T and PN processing devices.

As shown in this example, the functions that realize the electronic exchange are comprised of the so-called input/output processing functions shared by processing devices such as PL, PT, and PN in the above example, and the so-called internal processing functions shared by the PC. The functions are completely different in character from the point of view of the programs that implement each function.

That is, as is clear from the detailed explanation of the functions of each processing device mentioned above, the so-called input/output processing is a process that directly monitors and controls the communication path system equipment, and the program that realizes the input/output processing is also a process that directly monitors and controls the communication path system equipment. It is clear that this will be a program that deeply reflects the physical properties of

On the other hand, so-called internal processing, such as numeric analysis and trunk selection, is mostly logical processing to realize switching functions, and these processings are based on the physical properties of communication path equipment, such as time. This is a process that realizes the logical functions of the exchange that are unique to all exchanges and are completely independent of the physical differences between the split communication path and the space division communication path.

In this way, the control system of the exchange is configured as shown in Figure 2,
A distributed processing system has generally been used in which each processing device, such as PL, PT, and PN, is responsible for the physical processing of the exchange, and, for example, a PC is responsible for the logical processing of the exchange.

However, in a functional distributed processing system with such a configuration, it is impossible to make the program configuration of the PC, which is originally responsible for the logical processing of the exchange, completely independent from the physical processing of the exchange. It is impossible to commonly use the program of the processing unit PC for exchanges with different types of communication line equipment or exchanges with different configurations of communication line equipment, and this is the first step. This is a drawback of the general functionally distributed processing method shown in Figure 2.

For example, in the configuration shown in FIG. 2, the processing devices PC are LC and TRK.

L when sending various operation command information to NW
Physical configuration of C, TRK, NW For example, LC, TRK
It is necessary to know the correspondence between the LC and the NW or the correspondence between the processing devices PL and PT, and furthermore, when it becomes necessary to connect the LC and the TRK, for example, it is necessary to select an empty communication path to connect them. There is, for this purpose NW
It is clear that information representing the structure of the PC is required.

Therefore, it has been impossible for the PC program to perform processing completely independent of the structure of the communication path device.

The object of the present invention is to provide a control system for an electronic exchange that eliminates these deficiencies, and for this purpose, the present invention provides a control system for an electronic exchange that does not depend on the configuration of the processing equipment group that controls the communication line equipment of the electronic exchange and the communication line equipment. It is characterized by distributing switching functions into processing devices, and disposing processing devices having functions of converting and distributing information and selecting communication paths between these processing devices. explain.

FIG. 3 shows a first embodiment of the present invention, which makes it possible to realize a distributed processing method, except for the above-mentioned drawbacks of the general distributed processing method shown in FIG. As shown in the figure, the processing device PC and the processing device groups PL, PT
, PN is installed, and when this PC sends information to the PL, PT, and PN, the PC transmits all information based on the physical structure of the communication path equipment. It is sent to the PB as completely independent and completely logical information, and once the PB receives this information, it converts this information into information that has physical meaning of the communication path equipment, and then transmits it to the PL, PT,
On the other hand, when the PL, PT, and PN send information to the PC, the PB has a function of converting information in the complete opposite manner.

For example, the PB receives information regarding call route selection sent from the PC, that is, the LC number and TRK number, which are the logical numbers of the two terminals necessary for selecting the call route, and selects an empty call route between them. It has functions such as sending this result to the PN.

With such a configuration, the processing device PC can be made into a device that is completely independent from the physical characteristics of the communication line equipment and has only the logical functions of a switch. For example, it can be used for different exchange methods of communication line equipment without changing the functions of the PC.
It is clear that this method can be used commonly and has a great effect on the design of electronic exchange control systems and the development of programs.

Note that FIG. 4 shows a second embodiment of the present invention,
This is a configuration in which the processor PB also controls the NW without providing a processor PN that controls the communication path NW, and it goes without saying that even with this configuration, the same effects as described above can be obtained. be.

According to the present invention, the control system of an electronic exchange can have flexibility and universality6.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional centralized control system in an electronic exchange, Fig. 2 is an explanatory diagram of the same conventional function distributed processing system, Fig. 3 is an explanatory diagram of an embodiment of the present invention, and Fig. 4 FIG. 3 is an explanatory diagram of another embodiment of the present invention. LC: Subscriber circuit, TRK: Trunk circuit, NW: Communication path device, CC: Central processing unit, PL: Processing device that controls the subscriber circuit, PT: Processing device that controls the trunk circuit, PN: PC, a processing device that controls the communication path equipment; PB, the processing device that controls internal processing; PL, PN, conversion of information between the PN and the PC. A processing device that controls distribution, etc.

Claims (1)

[Claims] 1. In the control system of an electronic exchange, an independent processing device is placed between a group of processing devices that control the communication path equipment and a processing device that processes switching functions that do not depend on the configuration of the communication path equipment. An independent processing device receives complete logical information independent from the physical structure of the communication path equipment from the processing device, converts it into information having physical meaning of the communication path equipment, and sends the information to the processing equipment group. On the other hand, when the processing device group sends information to the processing device, the independent processing device performs completely opposite information conversion.