JPH0666992B2 - Station data management system for distributed exchanges - Google Patents

Description

The present invention relates to a station data management system in a distributed exchange.

(Prior Art) FIG. 3 is a diagram showing an example of a station data management system in a conventional distributed exchange. However, FIG. 3 describes only the configuration of the exchange call control related to the present invention, and omits the part related to the communication path. Various resources are necessary for the exchange to proceed with call control. The call control software includes a call control program, a terminal state memory indicating a state such as empty / closed of a terminal controlled by the exchange, Three resources are indispensable: attributes of subscribers and lines, station data holding a conversion table for obtaining a subscriber's accommodation position from a telephone number, and the like. In FIG. 3, the control processors P _{1 to} P _n use the line interface LI to generate an event such as calling / restoring or calling / ending of the subscriber T ₁ or trunk TRK under the control of its own processor.
Input via NF to perform call control. In this case, if it is not necessary to connect to the subscriber accommodated in the other processor, the call control is performed by communicating with the other processor via the interprocessor network.

At this time, as for the above-mentioned three kinds of resources, the call processing program and the terminal state memory are stored in the main recording device MM, and the station data is stored in one data memory DM.

A call the subscriber T ₁ for controlling the control processor P ₁ having the above constitution will be described access of the data memory DM from the control processor P ₁ when calling subscriber T _n under the control of control processor P _n . When the control processor P ₁ detects the calling of the subscriber T ₁ via the line interface LINF, it sends the accommodating position of the subscriber T ₁ to the data memory DM via the interprocessor network, and the subscriber data of T ₁ is sent. Read out. Based on this subscriber data, the control processor P ₁ obtains various attribute information (subscriber type, calling class, etc.) about the subscriber T ₁ .

Then from the subscriber T _1, receives the subscriber number of the subscriber T _n, via the inter-processor network which data memory
The subscriber is sent to the DM, and the conversion table from the subscriber number stored in the DM to the accommodation location is accessed to obtain the accommodation location of the subscriber T _n . Since the accommodation position of the called subscriber T _n has been obtained, the control processor P ₁ reads the subscriber data of the subscriber T _n from the data memory DM by the same procedure as described above. If necessary, the control processor P ₁ uses the subscriber data of the subscribers T ₁ and T _n to perform a regulation check such as connection availability.

With the procedure described above, the control processor P ₁ and the data memory DM
FIG. 4 describes the sequence of data transfer between them. In the conventional example, the control processor P ₁ needs to access the data memory DM 3 times and transfer the data 6 times in total via the interprocessor network.

(Problems to be Solved by the Invention) In the conventional station data management method described above, all station data is centrally managed in one location, and therefore access to station data DM from the control processor is performed through the interprocessor network. However, if the traffic increases, the communication time and station data access waiting time increase, which is not preferable.

Further, if the station data DM stops functioning due to a failure or the like, all control processors will not be able to obtain station data, and the advantage of distributed control that improves reliability by configuring an exchange with multiple control processors will not be utilized. is there.

(Means for Solving the Problems) In the present invention, a plurality of subscribers or trunks are distributed and accommodated in a plurality of control processors, and call processing of each subscriber or trunk is controlled by the control processor. In the type exchange, the first station data corresponding to the accommodation position indicating the attribute of the subscriber or the trunk is stored in the first storage device of the control processor which accommodates the subscriber or the trunk, and the first station data is stored. The second station data other than the second station data is stored in the second storage device provided in all control processors in a duplicated manner, which is a station data management system.

(Operation) According to the present invention, a plurality of subscribers or trunks are accommodated in a plurality of control processors in a distributed manner, and call processing of each subscriber or trunk is controlled by the control processor. The first station data existing corresponding to these accommodation positions indicating the attributes of the trunk is divided and arranged under the control of the control processor accommodating the subscriber or the trunk, and the first station data other than the first station data is arranged. The station data of 2 are allocated to all control processors in duplicate. When the control processor accesses the second station data, it is read from the data memory arranged in duplicate, and the first station data is read between the processors only when accessing the station data under the control of another control processor. This is a station data management method for reading out via a network.

(Example) The present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing an example of a station data management system of a distributed exchange according to the present invention. In the figure, control processors P _{1 to} P _n ,
The functions of the line interface LINF and the main memory MM are the same as in the conventional example. The difference from the conventional example is that a data memory for storing station data is distributed and arranged in each control processor.

Generally, station data required for switching call control can be classified into the following two types. Data that describes the attributes of the subscriber or trunk and is necessary for accommodating location. Data that is not necessary for accommodating the accommodation position, such as a conversion table for obtaining the accommodation position from the subscriber number. (That is, this is data other than the above.) Of these two types of station data, the station data corresponding to the accommodation position is the data for all subscribers or trunks accommodated in the converter in the conventional example. As described above, it is not necessary to centrally manage in one data memory, and it is possible to manage by physically dividing. That is, in the present invention, the station data corresponding to the accommodation position is divided and stored in the local data memories LDM _{1 to} LDM _{n shown} in FIG. For example subscriber T ₁ under the control of control processor P _1, the trunk TRK ₁
Subscriber data for the subscriber T _n , trunk TRK _n under the control of the control processor P _n is stored in the local data memory LDM _1.
Divide into LDM _n and store.

On the other hand, the station data corresponding to the non-accommodation position cannot be divided and stored as in the above, and in the present invention, it is stored in the common data memory CDM of FIG. In this case, a total of n common data memories CDM are provided under the control of the control processors P _{1 to} P _n , but the contents are the same.

A call the subscriber T ₁ for controlling the same control processor P ₁ and the conventional example having the above constitution will be described in the access to the data memory for reading a subscriber T _n under the control of control processor P _n .

Control processor P ₁ when it detects a calling subscriber T ₁ via the line interface LINF, reads the subscriber data of T ₁ from the local data memory LDM _1.

Next, the subscriber numbers of the subscribers T ₁ to T _n are received, and the conversion table from the subscriber number to the accommodation position stored in the common data memory CDM is accessed to accommodate the called subscriber T _n . Get the position.

In the above procedure, since the station data to be accessed exists in the local data memory LDM ₁ and the common data memory CDM, it is not necessary to communicate via the interprocessor network as in the conventional example.

Next, since the subscriber data of the called subscriber T _n is stored in the local data memory LDM _n under the control of the control processor P _n , this data is stored between the processors in the same manner as in the conventional example. Read from local data memory LDM _n via network.

A data transfer sequence on the interprocessor network by these procedures is shown in FIG. In the present invention, the number of transfers is reduced to two.

(Effects of the Invention) As described above, according to the present invention, the number of transfers through the interprocessor network can be reduced, and high speed switching call control can be achieved.

In addition, unlike the conventional example, since the station data is not centrally managed in one place, even if one data memory becomes inaccessible due to a failure or the like, it is possible to avoid stopping the entire system, and to improve reliability. improves.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a station data management system of a distributed exchange in an embodiment of the present invention, FIG. 2 is a diagram showing a sequence of data transfer on an interprocessor network in an embodiment of the present invention, and FIG. FIG. 4 is a diagram showing an example of a station data management system of a conventional distributed exchange, and FIG. 4 is a diagram showing a sequence of data transfer on an interprocessor network in the conventional example. In the figure, P _{1 to} P _n are control processors, LINF is a line interface, MM is main memory, T _{1 to} T _n are subscribers, TRK _{1 to} TRK _n are trunks, LDM _{1 to} LDM _n are local data memories, CDM indicates a common data memory and DM indicates a data memory.

Claims (1)

[Claims] 1. A subscriber or trunk in a distributed switch in which a plurality of subscribers or trunks are distributedly accommodated in a plurality of control processors, and the call processing of each subscriber or trunk is controlled by the control processor. The first station data corresponding to the accommodation position indicating the attribute of is stored in the first storage device of the control processor accommodating the subscriber or trunk,
A station data management system characterized in that the second station data other than the first station data is redundantly stored in a second storage device provided in all control processors.