JPS6242436B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a call processing system in a digital switch, and particularly in a distributed digital switch configured by connecting a plurality of load-balanced distributed control modules.

Recently, with the development of semiconductor technology, digital exchanges are moving from a centralized type to a distributed type. This distributed digital switch includes a subscriber line signal transmission/reception circuit including a time division communication path, a control processing device, a push button signal receiver, etc., a trunk line signal transmission/reception circuit,
It is constructed by connecting a plurality of distributed control modules (hereinafter simply referred to as modules) that integrate other circuits necessary for exchange operations. This makes it possible to configure a small-scale to large-scale exchange depending on the number of modules connected.

According to a conventional call processing system in a distributed digital switch, a numeric analysis process is performed on a selection signal received from an originating subscriber in a calling module, and then call processing is performed in a terminating module. In this case, each module has a memory containing a number translation table created by comparing subscribers accommodated in all modules with the module number. That is, the digit analysis process searches this number translation table to detect the number of the terminating module in which the terminating subscriber is accommodated, thereby
Call processing of the terminating module is performed. However, in this conventional method, as the number of modules increases, the memory capacity of the number translation table increases in proportion to the square of the number of modules, resulting in higher manufacturing costs. There is a problem in that this applies to all modules, and therefore there is no flexibility in the operation of the device.

In addition, according to other conventional distributed digital exchanges, the number translation table is centrally installed in a specific module, and each module performs numeric analysis processing by communicating with the specific module. There is. However, this conventional system has the problem of increasing the amount of communication between modules and limiting the scope of application of the distributed digital switch.

The object of the invention is to provide a concept in which each module is equipped with a subscriber-only number translation table contained within its own module, and each module forwards the selection signal received from the originating subscriber to all other modules. Based on this, it is possible to simultaneously perform numerical analysis processing in each module. Therefore, when the number of subscribers increases, it is only necessary to change or increase the number translation table memory of the module that accommodates the subscribers. The object of the present invention is to reduce costs, provide flexibility in device operation, and reduce the amount of communication between modules, thereby solving the problems of the conventional method described above.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block circuit diagram of a distributed digital switch as an embodiment of the present invention. In Figure 1, n modules MOD-1, MOD-
2,……,MOD-n is Jankuta Highway
They are interconnected by JWH ₁₂ , JWH ₁₃ , . . . , JWH _o-1 , _o , thereby forming a voice and data path. More modules
Signal lines DL 1 , DL 2 , . . . , DL _o are connected as a common bus between MOD- ₁ , MOD- ₂ , . . . , MOD-n. As a result, each module MOD-1, MOD-2, ......, MOD-n sends the selection signal received from the calling subscriber to the signal lines DL ₁ , DL ₂ , ......, DL _o . . For example, a selection signal received from the originating subscriber in module MOD-1 is transmitted via signal line DL ₁ to all other modules MOD-2, MOD-3,...
..., is sent to MOD-n. As a result, numeric analysis processing is performed simultaneously in each module, and as a result, call processing of the incoming module is performed.

FIG. 2 is a detailed block circuit diagram of the distributed control module of FIG. In FIG. 2, a communication path system 1 includes subscriber circuits 11-1, 11-2, . 12 and a digital communication path 13. in this case,
Subscriber circuits 11-1, 11-2, ......, 11-
m has functions such as power supply, overvoltage protection, and calling signal transmission. This communication path system 1 is controlled by a control processing device 2 having a main memory 3.

The above-mentioned module MOD-1 is equipped with a subscriber number translation table memory 4 accommodated in the module and a signal transmitting/receiving device 5 for storing selection signals from the subscribers. The number 5 is stored in the receiving register 5'. Further, the shift register 6-1 is connected to the numeric receiving register 5', and on the other hand, the shift register 6-2, 6-3, . . .
..., 6-n are connected to signal lines DL ₂ , DL ₃ , . . . , DL _o via receivers R ₂ , R ₃ , . . . , _Ro . Furthermore, comparators 7-1, 7-2, ......, 7-n are provided between the number translation table memory 4 and each shift register 6-1, 6-2, ......, 6-n.
is connected. That is, the comparator 7-1 is for determining whether the selection signal is the subscriber number accommodated in the module MOD-1, and the other comparators, for example 7-2, are for determining whether the selection signal is the subscriber number accommodated in the module MOD-2.
The selection signal of the originating subscriber in the module
This is for determining whether the subscriber number is stored in MOD-1 or not. In other words, these comparators determine whether the terminating subscriber indicated by the selection signal generated within the distributed digital switch is connected to module MOD-1.
The number of the calling module, which is the result of this determination, is stored in a flip-flop group 8 constituted by the same number of flip-flops as the number of modules (same number as the number of comparators);
Furthermore, based on this stored content, the control processing device 2 instructs the communication path system 1 to select a junk highway.

Note that the contents of shift register 6-1 are based on the driver.
D ₁ to the signal line DL ₁ , and therefore the other modules MOD-2, MOD-3, ......
Sent to MOD-n.

In addition, in the above embodiment, a signal line connected to a bus is shown as a notification means for the number translation table memory, but it is also possible to allocate a specific bus by merging it with a junction highway between modules. System separation in which bus connections are made only within a plurality of modules is also possible, and lead connections may be made between each module.

As explained above, according to the present invention, it is only necessary to change or increase the number translation table memory of one module as the number of subscribers changes or increases, so manufacturing costs can be reduced and equipment operation can be made more flexible. In addition, since the modules are connected after determining the incoming module, the amount of communication between the modules can be reduced, which is useful for solving the problems of the conventional method described above.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of a distributed digital exchange as an embodiment of the present invention, and FIG. 2 is a detailed block circuit diagram of the distributed control module of FIG. 1. MOD-1, MOD-2, ......, MOD-n:
Module, DL ₁ , DL ₂ ,......, DL _o : Signal line, JWH ₁₂ , JWH ₁₃ ,......, JWH _o-1 , _o : Junction highway, 1: Communication path system, 2: Control processing unit , 3: Main memory, 4: Number translation table memory,
5: Signal transmitting and receiving device, 6-1, 6-2,......,
6-n: Shift register, 7-1, 7-2,...
..., 7-n: comparator, 8: flip-flop group.

Claims (1)

[Claims] 1. In a distributed digital switching system configured by connecting a plurality of distributed control modules each having a time-division communication path and a control processing device for the time-division communication path, each distributed control module has a A number translation table memory is provided for storing subscriber data, and each distributed control module forwards the selection signal received from the originating subscriber to all other distributed control modules, and in each distributed control module the selection signal and the selected signal are transmitted to each distributed control module. A call processing method in a distributed digital switch that performs numeric analysis processing by comparing the information with the information in the number translation table memory.