JPS6242435B2 - - 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 is provided with a number translation table as a memory, which is created by comparing the subscribers accommodated in all modules with the module numbers. 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 an increase in 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 present invention is that each module is equipped with a subscriber-only number translation table memory housed within its own module, and each module transfers the information stored in the number translation table memory to all other modules. Based on this concept, when the number of subscribers changes or increases, it is only necessary to change or increase the number translation table memory of the module that accommodates the subscriber, thus reducing manufacturing costs and providing flexibility in equipment operation. The object of the present invention is to solve the above-mentioned problems of the conventional method by providing flexibility and reducing the amount of communication between modules.

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 , n, thereby forming a voice and data path. In addition, the module
Between MOD-1, MOD-2, ..., MOD-n,
Signal lines DL ₁ , DL ₂ , ..., DLn are connected as a common bus. Furthermore, each module MOD
-1, MOD-2..., MOD-n are each equipped with a subscriber's number translation table memory (not shown) accommodated in the module, and the contents of the number translation table memory are transmitted to the signal line DL ₁ in a time-sharing manner. , DL ₂ , ..., DLn. For example, the module MOD-1 sends the contents of the number translation table memory to the other modules MOD-2, MOD-3, . . . , MOD-n via the signal line _DL1 .

Figures 2A to 2C are the signal lines DL _{1 and DL1} in Figure 1, respectively.
FIG. 3 is a timing diagram of the signals appearing on DL ₂ and DLn. As shown in Figure 2A, the signal line DL ₁ has m
subscriber numbers N ₁₁ , N ₁₂ , ..., N _1n are arranged in a time division manner surrounded by a frame synchronization signal F, and
Similarly, as shown in FIG. 2B, the signal line DL ₂ has
m subscriber numbers N ₂₁ , N ₂₂ , ..., N _2n are arranged in a time division manner surrounded by a frame synchronization signal F, and as shown in FIG. The subscriber numbers Nn ₁ , Nn ₂ , . . . , Nnm are arranged in a time-division manner surrounded by a frame synchronization signal F.

Thus, at each module in FIG. 1, the selection signal received from the originating subscriber can be compared with the subscriber number information in all modules, thereby allowing call processing for the terminating module.

FIG. 3 is a detailed block circuit diagram of the distributed control module of FIG. In FIG. 3, the communication path system 1 includes subscriber circuits 11-1, 11-2, . , and a digital communication path 13. In this case, the subscriber circuits 11-1, 11-2, . . . , 11-m have 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 comprises a subscriber number translation table memory 4 accommodated in the module and a signal receiving device 5 for storing selection signals from the subscribers, in which case the selection signals are transmitted to the device. The number 5 is stored in the receiving register 5'. Further, the shift register 6-1 is connected to the number translation table memory 4, and on the other hand, the shift register 6-2, 6-3,...,
6...n are connected to signal lines DL ₂ , DL ₃ , . . . , DLn via receivers R ₂ , R ₃ , . . . , Rn. Further, a numeric receiving register 5' and each shift register 6
-1, 6-2, ..., 6-n, there is a comparator 7.
-1, 7-2,..., 7-n are connected. In other words, the comparator 7-1 selects the module
This is for determining whether the subscriber number is stored in MOD-1 or not, and other comparators such as 7-
2 is for determining whether the selection signal is the subscriber number accommodated in module MOD-2. In other words, these comparators determine whether the called subscriber indicated by the selection signal is accommodated in any module within the distributed digital switch. This determination result is stored in a flip-flop group 8 composed of the same number of flip-flops as the number of modules (same number as the number of comparators), and further, based on this stored content, the control processing device 2 performs a yank operation on the communication path system 1. Instructs the highway selection operation.

Note that the contents of shift register 6-1 are based on the driver.
D ₁ to the signal line DL ₁ and thus the other modules MOD-2, MOD-3, ..., MOD-
sent to n. Further, the number of number receiving registers 5' in the signal transmitting/receiving device 5 may be two or more.
In this case, the number of comparators also increases.

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 combine it with a junction highway between modules and allocate a specific path. 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 FIGS.
FIG. C is a timing diagram of signals appearing on signal lines DL ₁ , DL ₂ , and DLn of FIG. 1, and FIG. 3 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 ,..., DLn: Signal line,
JHW ₁₂ , JHW ₁₃ ,..., JHW _o-1 , n: junk highway, 1: communication path system, 2: control processing device,
3: Main memory, 4: Number translation table memory, 5: Signal transmitting/receiving device, 6-1, 6-2,..., 6-n: Shift register, 7-1, 7-2,..., 7-n: Comparison Device, 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 for storing subscriber data is provided, and each distributed control module transfers the information in the number translation table memory to all other distributed control modules in a time-sharing manner, and each distributed control module transmits the information. A call processing method in a distributed digital switch that performs numerical analysis processing by comparing the selection signal received from a subscriber with the transferred information on all subscribers.