JPS60192494A - Decentralized exchange system - Google Patents

Abstract

PURPOSE:To save communication processing amount by allowing each line device to process singly normal connection for accommodated lines and apply communication with a controller after the connection with a line accommodated in other line device or other controller in addition to quasi-normal connection such as busy tone processing at busy state of a called party and abnormality processing such as fault processing. CONSTITUTION:When a subscriber A makes a call to a subscriber B accommodated in the same line device LE1, a central controller CC1 reference the own ilde memory 1B and the own subscriber data memory SD, and when the subscriber B is idle and connectable to the subscriber A, connection switch SW1 is controlled and th subscribers A, B are connected. In this case, the central controller CC1 makes no communication to a controller CE. When the subscriber B is busy and not connectable to the subscriber A, the central controller CC1 connects the subscriber A to an optional communication channel CL via a connection switch SW1 and requests busy tone processing to a central controller CC2 of the controller CE via a control channels SL. In the controller CE, the central controller CC2 transmits a busy tone to the communication channel CL connected to the subscriber A via a connection switch SW2.

Description

DETAILED DESCRIPTION OF THE INVENTION +a+ Technical Field of the Invention The present invention relates to a switching system, and particularly to a distributed switching system capable of providing a wide range of application and advanced switching control functions.

Background of the Technology Electronic exchanges that were first put into practical use adopted a centralized control system in which a dedicated single processor with high reliability and a high degree of real-time performance performed all exchange connection processing. As a result, the processor part became expensive, making it economically difficult to apply it to small-scale exchanges.Additionally, when adding or modifying functions or adding lines, it was necessary to temporarily stop the system.

On the other hand, electronic exchanges that have been put into practical use in recent years utilize microprocessors, which have undergone remarkable technological advances, and employ a multiprocessor system in which exchange connection processing is controlled functionally or load-wise by a plurality of microprocessors in a distributed manner. In this multiprocessor system, functions can be easily added or modified if function distribution is used, and if load distribution is used, it is economical for small to large scale exchanges. It has the advantage of being applicable.

(C1 Prior Art and Problems Figure 1 is a diagram showing an example of a conventional multiprocessor system. In Figure 1, an electronic exchange has multiple networks NW each accommodating multiple subscriber lines, and each network It is equipped with a call processor CPR provided corresponding to the network NW and a management processor MPR connectable from all call processors CPR.Each call processor CPR executes connection control of the corresponding network NW. management processor MP
R is a subscriber data memory SD that stores attributes of all subscribers.
, and an air block memory IB for storing air block information,
Each call processor CPR manages various information required for exchange connection. Therefore, for example, when a call is made from subscriber A to subscriber B, call processor CPR corresponding to subscriber A notifies management processor MPH of subscriber A's call via processor bus PB, and management processor MPR is registered to subscriber A by vacant memory IB.
and extracts the subscriber data of subscriber A from the subscriber data memory SD and sends it back to the call processor CPR. The call processor CPR then calls the received subscriber B
to the management processor MPR,
The management processor MPR converts the telephone number of subscriber B into accommodation location information, and converts the telephone number of subscriber B into accommodation location information.
Further, the subscriber data of subscriber B is extracted from the subscriber data memory SD and sent back to the call processor CPR. Thereafter, in the same manner, each time subscriber B calls, responds, subscribers A and B recover, etc., the call processor CPR
communicates with the management processor MPR via the processor bus PB and executes necessary exchange connection control.

As is clear from the above explanation, in conventional distributed switching systems, the management processor MPR collectively manages the blockage information, subscriber data, and various resources of all subscriber lines, so the call processor CPR manages the call It is necessary to communicate with the management processor MPR each time processing is performed.
This communication processing puts pressure on the call processing capacity of the call processor CPH, and there is a drawback that the processing capacity does not improve in proportion to the increase in the number of call processors CPR.

(dl) Purpose of the Invention The purpose of the present invention is to eliminate the drawbacks of the conventional distributed switching system as described above, and to provide a distributed switching system in which each processor that performs distributed control does not use the processing capacity of the processor as much as possible due to communication between the processors. It lies in the realization.

(el) Structure of the Invention This object is to provide a plurality of line devices each accommodating a plurality of lines, a control device that connects the line devices to each other, and a communication channel between each of the line devices and the control device through a plurality of communication channels. A unit system is configured by connecting the plurality of accommodating lines with each other to form a unit system, and each of the line devices executes a normal connection process between the plurality of accommodating lines and an exchange connection between the accommodating line and the communication channel. The interconnection of communication channels leading to the line equipment and all connection processes other than normal connections handled by each of the line equipment are executed, and each of the line equipment and the control device exchange control information via the control channel. This is accomplished by communicating.

That is, in the present invention, each line device independently processes normal connection between accommodated lines, semi-normal connection such as busy tone processing when the called party is busy, abnormal processing such as failure processing, and processing of other lines. Since communication with the control device is performed for the first time upon connection to the line housed in the device or control device, the amount of communication processing is significantly reduced.

(fl　Embodiments of the invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing a distributed exchange system according to an embodiment of the present invention, FIG. 3 is a diagram showing an example of a scale expansion method in FIG. 2, and FIG. 4 is a diagram showing reliability improvement in FIG. 2. It is a figure showing an example. Note that the same reference numerals indicate the same objects throughout the figures. In FIG. 2, each unit system group has a plurality of communication channels CL and one control channel SL.
Two line devices L E ] and LE connected by
2 and one control device CB. Each of the line devices LEI and LE2 includes a switch SWI that exchanges and connects the subscriber lines it accommodates and a communication channel CL leading to the control device CB, and a central control unit CCI for controlling the exchange connection.

Furthermore, the central control unit CCI is connected to the line equipment LEI or LE
2, a subscriber data memory SD that stores the attributes of the subscriber accommodated in the subscriber data memory 2, and an idle memory I that stores the idle information of the subscriber.
B, and a control channel S leading to the control device CE.
Connected to L.

In addition, the control device CB controls communication channels CL to each line device LEI and LE2, and the communication channels CL.
It is provided with a connection switch SW2 for exchange-connecting the station line COL, trunk line PVL, or switchboard ATT, and a central control bag WGC2 for controlling the exchange connection. Furthermore, the central control unit C
C2 is connected to a control channel SL leading to each line equipment LEI and LE2. In Figure 2, subscriber A
When a call is made to subscriber B accommodated in the same line equipment LEI, the central control unit CCI calls the subscriber B accommodated in the same line equipment LEI,
It also refers to the subscriber data memory SD, and if subscriber B is free and can be connected to subscriber A, it controls the connection switch SWI to connect subscribers A and B. At this time, the central control device CC1 does not perform any communication with the control device CE.

If subscriber B is unable to connect to subscriber A due to a busy situation, central control bag ffcc1 connects subscriber A to any communication channel CL via connection switch SW1, and then connects subscriber A to any communication channel CL via control channel SL. Central control device CC2 of control device CE
to request busy tone processing.

In the control device CE, the central control device CC2 sends a busy tone to the communication channel CL to which the subscriber A is connected via the connection switch SW2.

Next, when subscriber A makes a call to subscriber C accommodated in another line bag NLE2, central controller CC1 connects subscriber A to any communication channel CL via connection switch SWI, and The telephone number of subscriber C is transmitted to the control word WCE via SL to request connection. Control device c
In E, the central controller C (, 2 connects the i!1 communication channel CL to any communication channel CL leading to the line equipment LE2 via a connection switch SW2, and connects the i!1 communication channel CL to any communication channel CL leading to the line equipment LE2 via the control channel SL). The telephone number of subscriber C is transmitted to the control channel SL leading to subscriber C2, and a connection is requested.

In the line equipment LE2, the central control unit CCI refers to the idle memory IB and the subscriber data memory SD, and if the subscriber C is free and can be connected to the subscriber A, calls the subscriber C, and if the subscriber C responds, Subscriber A via control device CE
Connected to. If subscriber C is busy, controller C
E is notified of this, and the control device CE performs busy tone processing. Furthermore, subscriber A uses the central office line COL or trunk line PVL.
When a call is made to the central control unit CC1, a connection is requested from the central control unit CC1 to the central control unit 1cc2 via the control channel SL.

Note that when subscriber A requires the transmission of broadband signals, such as a video telephone, and connects to a broadband line accommodated in another line device LE2 or a trunk line PVL accommodated in control device CE, , the central control device CC1 also includes the line type (video phone) of the subscriber A in the control information transmitted to the central control device CC2 via the control channel SL.

The central control device CC2 that received the control information
A plurality of communication channels CL determined from the line type are assigned to the call to be processed.

Next, when increasing the number of subscriber lines to be accommodated beyond the number that can be accommodated by the unit system group, two unit system groups are installed as shown in Figure 3, and the connection between the control devices CEI and CB2 of both unit system groups is Communication channel CL3 and control channel S
Connect by L3.

Furthermore, a central office line C is connected to the control device CE1 of one unit system group.
By accommodating OL and the trunk line PVL in the control device CE2 of the other priority system group, functions are shared between the control devices CEI and CB2.

As a result, calls that span both unit systems are routed to communication channel C.
Connected via L3.

In electronic exchanges that require even higher reliability, two control devices CEI and CB2 are installed in the system group, and each line device LE is connected to the recontrol devices CEI and CB2.
for communication channels CLI and CL 2, respectively.
, and control channels SL1 and SL2, respectively. When the re-controlling devices CEI and CB2 are operating normally, each line device LEI, B2 distributes the load to the re-controlling devices CEI and CB2 and requests processing, and if any of the controlling devices CEI or CB2 is affected. In the event of a failure, each line device f L E 1 and LE2 requests processing only to the normally operating control device CEI or CB2.

As is clear from the explanation below, according to this embodiment, the line devices LEI and LE2 in the Eiji system group independently control the normal connection of the subscriber lines they accommodate, so
Communication with the control device cE becomes unnecessary. Furthermore, since the line devices LE1 and LB2 rely on the control device CE for semi-normal processing such as busy processing and abnormal processing in the event of a failure, the functions provided are simple and can be realized economically. Furthermore, the control information exchanged between the line device LP and the control device CE includes not only exchange connection control information but also information such as line type and requested service type, so it can be applied to the advancement of exchange functions. It is. Furthermore, by installing multiple unit system groups together, lines can be easily added. Furthermore, by providing a plurality of control devices CE in a unit system group, it becomes possible to construct a highly reliable unit system group.

It should be noted that FIGS. 2 to 4 are only one embodiment of the present invention, and for example, the line devices L to E and the control device C
The configuration of B is not limited to that shown in the drawings, and many other modifications may be considered, but the effects of the present invention will not change in any case. In addition, the line equipment L within the unit system group
E is not limited to two, and the effects of the present invention will not change even if it is one or any number of three or more.

fgl Effects of the Invention According to the present invention, it is possible to realize a distributed exchange system in which each processor to be distributed and controlled does not have its processing capacity compressed by communication between processors, and is economically applicable over a wide range of areas. This makes it possible to realize an electronic exchange.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional multiprocessor system, FIG. 2 is a diagram showing a distributed switching system according to an embodiment of the present invention, and FIG. 3 is a diagram showing an example of scale expansion in FIG.
FIG. 4 is a diagram showing an example of reliability improvement in FIG. 2. In the figure, A, B and C are subscribers, ATT2 is a switchboard, CC1 and CC2 are central control units, ccp
What about communication control equipment, CE, CEI and CB2? dJ control device, CL, CLI, CL2 and CL3 are communication channels, co r is office line, COT is office line trunk, CP
R is the call processor, C3L is the console, IB is the idle memory, LEI and LE2 are the line equipment, MPR is the management processor, NW is the network, OPT is the operator trunk, PB is the processor bus, PVL is the trunk line, and PVT is the relay line trunk, SD is subscriber data memory, SLI, SL2 and SL3 are control channels, T
RK indicates trunk. (Su 3 figure 4 leather figure 4

Claims (1)

[Claims] +11 A plurality of line devices each accommodating a plurality of lines;
A unit system is configured by connecting each of the line devices and the control device through a plurality of communication channels and one control channel, and each of the line devices connects the plurality of line devices with each other. Executing normal connection processing between accommodation lines and exchange connection between the accommodation lines and the communication channel;
The control device executes interconnection of communication channels reaching a plurality of line devices and all connection processes other than normal connections handled by each of the line devices, and each line device and the control device connect the control channels to each other. A distributed exchange system characterized by transmitting control information through a network. (2) The control information transmitted via the control channel includes line type, requested service type, etc. in addition to switching connection information of each call, and the control device transmits a predetermined number of communication channels based on the control information. Claim 1 is characterized in that by assigning to the call, broadband switching is possible.
Distributed exchange method described in section. (3) A plurality of the unit system groups are installed, and the control devices of each unit system group are connected to each other through communication channels and control channels to share functions.By doing so, the number of lines is multiple times that of the unit system group. The distributed switching system according to claim 1, wherein the distributed switching system is capable of accommodating. (4) The unit system group includes a plurality of control devices,
Claim □Claim 1, wherein each line device in the unit system group is connected to each control device through the communication channel and the control channel, so that the control device has a “redundant configuration.” □Claim 1 Decentralized exchange method described.