JPS63107391A - Trunk data management system for distributed exchange - Google Patents

Abstract

PURPOSE:To shorten a communication time and an access-waiting time for trunk data storing the first trunk data representing the trunk attributes of a subscriber's area corresponding to its location in the first storage of a control processor, but storing all of the second trunk data other than the first trunk data in a second storage provided in the control processor additionally. CONSTITUTION:Trunk data corresponding to locations of subscribers are stored in divisions in local data memories LDM1 LDMn. On the other hand trunk data non-corresponding to said locations are stored in a common data memory CDM. The control processor P1, upon detecting a call from a subscriber T1 via a line interface LINF, reads out the subscriber data of the T1 from the local data memory LDM1. Then the processor P1 receives a subscriber number Tn from the subscriber T1, and accesses a conversion table that gives the location of a subscriber from a subscriber number stored in the common data memory CDM, and obtains the location of the callee subscriber Tn. Therefore, the number of times of transmission through inter-processor network is decreased, hence the exchange call control can be speeded up.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a central office data management system in a distributed switch.

(Prior Art) FIG. 3 is a diagram showing an example of a station data management system in a conventional distributed switching system. However, FIG. 3 only describes the configuration of switched call control related to the present invention, and parts related to communication paths are omitted. When an exchange performs call control, various resources are required, and the call control software consists of ■ call control program, ■ terminal status indicating whether the terminal controlled by the exchange is empty or occupied, etc. Three resources are essential: memory, and station data that holds attributes of subscribers and lines, conversion tables for obtaining subscriber accommodation locations from telephone numbers, and the like. In FIG. 3, when an event such as call origination/recovery, origination/termination, etc. occurs to subscriber T1 or trunk TRK under the control of the control processors P1 to Pn, the control processors P1 to Pn transmit the event via line interface LINF. input and perform call control. In this case, if it becomes necessary to connect to a subscriber accommodated in another processor, call control is performed by communicating with the other processor via the inter-processor network.

At this time, the three types of resources shown above are the call processing program and terminal status memory stored in the main recording device MM, and the station data stored in one data memory DM.

Subscriber T1 controlled by control processor P1 with the above configuration
subscriber T under the control of control processor Pn
The access from the control processor P1 to the data memory DM when calling the data memory DM will be explained. control processor P
1 is connected to subscriber T via line interface LINF.
When detecting the calling of subscriber T1, the accommodating position of subscriber T1 is sent to the data memory DM via the inter-processor network, and the subscriber data of T1 is read out. From this subscriber data, the control processor P1 obtains various attribute information (subscriber type, calling class, etc.) about the subscriber T1.

Next, the subscriber number of the subscriber Tn is received from the subscriber T1, and sent to the data memory DM via the inter-processor network, and a conversion table from the subscriber number to the accommodation location stored in the DM is generated. to obtain the accommodation location of subscriber Tn. Since the accommodation location of the called subscriber Tn has been obtained, the control processor P1 reads out the subscriber data of the subscriber Tn from the data memory DM using the same procedure as described above. If necessary, the control processor P1
1. Tn subscriber data is used to check regulations such as connection availability.

The fourth section describes the sequence of data transfer between the control processor P1 and the data memory DM using the procedure described above.
It is a diagram. In the conventional example, the control processor P1 is
The data memory DM is accessed three times and a total of six transfers are required via the inter-processor network.

(Problems to be Solved by the Invention) In the conventional station data management system described above, all station data is centrally managed in one place, so all accesses to the station data DM from the control processor go through the inter-processor network. If the traffic increases, the communication time and the waiting time for accessing the station data will increase, which is not desirable.

In addition, if the station data DM stops functioning due to a failure, etc., all control processors will not be able to obtain station data, and the advantage of distributed control, which improves reliability by configuring a switch with multiple control processors, will not be utilized. be.

(Means for Solving the Problems) The present invention provides a distributed system in which a plurality of subscribers or trunks are distributed and accommodated in a plurality of control processors, and call processing for each subscriber or trunk is controlled by the control processor. In the switching system, first station data corresponding to an accommodation location indicating attributes of a subscriber or trunk is stored in a first storage device of the control processor accommodating the subscriber or trunk; This is a station data management system characterized in that second station data other than the station data of is stored redundantly in second storage devices provided in all control processors.

(Operation) The present invention provides a distributed exchange in which a plurality of subscribers or trunks are distributed and accommodated in a plurality of control processors, and call processing for each subscriber or trunk is controlled by the control processor. The first station data corresponding to the accommodating position indicating the attributes of the trunk is divided and arranged under the control of the control processor that accommodates the subscriber or the trunk, and the first station data other than the first station data The station data of No. 2 is redundantly placed in all control processors. When the control processor accesses the second station data, it reads from the data memory arranged in duplicate, and for the first station data, the processor reads it only when accessing the station data under the control of the other side processor. This is a station data management method that reads out data via an inter-station network.

(Example) The present invention will be described in detail below using the drawings. FIG. 1 is a diagram showing an example of a central office data management system of a distributed exchange according to the present invention. In the figure, control processors P1 to P
n, line interface LINF, main note 1; The functions of the device MM are the same as in the conventional example. The difference from the conventional example is that the data memory for storing station data is distributed among the control processors.

In general, the station data required for switched call control can be classified into the following two types. ■Data that describes attributes of subscribers or trunks and is necessary for corresponding accommodation locations. ■Data that is not necessary for accommodation location correspondence, such as a conversion table for obtaining accommodation location from subscriber number. (In other words, this is data other than ■.) Of these two types of station data, the station data corresponding to the accommodation location of ■ is the data for all subscribers or trunks accommodated in the converter. There is no need to concentrate management on one data memory as in the example, but it is possible to physically divide the data memory and manage it. That is, in the present invention, the station data corresponding to the accommodation location is divided and stored in the local data memories LDM1 to LDMn in FIG. 1. For example, subscriber data regarding subscriber T1 and trunk TRK1 under the control of control processor P1 is stored in the local data memory LDM1, and subscriber data regarding subscriber Tn and trunk TRKn under the control of control processor Pn is stored in the local data memory. It is divided into LDMn and stored.

On the other hand, it is impossible to store the station data corresponding to the non-accommodated position indicated by ■ in a divided manner as shown in ■, and in the present invention, it is stored in the common data memory CDM shown in FIG. In this case, a total of n common data memories CDM are provided under the control of the control processors P1 to Pn, but their contents are the same.

With the above configuration, access to the data memory when subscriber Tl controlled by control processor P1 makes a call and reads subscriber Tn under control of control processor Pn will be described as in the conventional example.

Control processor P1 is line interface LINF
When a call from subscriber T1 is detected via the subscriber T1, the subscriber data of T1 is read from the local data memory LDM1.

Next, the subscriber number of Tn is received from the subscriber T1, and the subscriber number to accommodation location conversion table stored in the common data memory CDM is accessed to obtain the accommodation location of the called subscriber Tn. .

In the above procedure, since the station data to be accessed exists in the local data memory LDM1 and the common data memory CDM, there is no need to communicate via the inter-processor network as in the conventional example.

Then, for the subscriber data of the called subscriber Tn, the local data memory LDM is under control to the control processor.
Since the data is stored in the local data memory LDMn, this data is read from the local data memory LDMn via the inter-processor network in the same manner as in the conventional example.

FIG. 2 shows the sequence of data transfer on the inter-processor network using these steps. In the present invention, the number of transfers is reduced to two.

(Effects of the Invention) As explained above, according to the present invention, the number of transfers via the inter-processor network can be reduced, and high-speed switched call control can be achieved.

In addition, because station data is not centrally managed in one place as in conventional systems, even if a part of the data memory becomes inaccessible due to a failure, the entire system can be prevented from stopping, improving reliability. improves.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a central office 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 inter-processor 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 inter-processor network in the conventional example. In the figure, Pl to Pn are control processors, LINF
is a line interface, MM is a main memory, T1 to Tn are subscribers, TRK1 to TRKn are trunks, L
DMI to LDMn are local data memories, CDM is a common data memory, and DM is a data memory.

Claims (1)

[Claims] In a distributed exchange, a plurality of subscribers or trunks are distributed and accommodated in a plurality of control processors, and call processing for each subscriber or trunk is controlled by the control processor,
First station data corresponding to the accommodation location indicating the attributes of a subscriber or trunk is stored in a first storage device of the control processor that accommodates the subscriber or trunk, and the first station data other than the first station data A station data management system characterized in that the second station data is redundantly stored in a second storage device provided in every control processor.