JPS6046584B2 - Multi-address communication control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-address communication control system for simultaneous communication from one subscriber to multiple subscribers in a telephone exchange or the like.

Multi-address communications include broadcasting-style broadcast communications and interactive-style conference communications, both of which significantly improve the serviceability of exchanges, and have been increasingly used in recent years. To give an overview, for example, in the former type of broadcast communication, an exchange receives a special number for a broadcast service request from an originating subscriber, hunts for the resources required for the broadcast service, sends a selection start message, and then connect with the incoming subscriber by receiving the selection signal of
In addition, repeated control by sending a selection start message is performed for a plurality of called subscribers, and finally a communication start message is sent to complete the call setting, and communication is performed thereafter. Conventional broadcast communication was actually carried out using the following method.

That is, the exchange calls and connects the broadcast service trunk after receiving a request from the originating subscriber, and then sends a selection initiation message. When the selection signal is received for one called subscriber, the called subscriber's line is called and connected, and after confirming that an answer back signal for connection confirmation has been sent back to the calling subscriber, the called subscriber's line is transferred to the broadcasting service trunk. and again sends a selection initiation message to the calling subscriber. The above process is then repeated for a plurality of called subscribers.
After receiving the selection signal of the final destination subscriber and connecting in the same manner as above, the final destination subscriber also connects to the broadcast service trunk, and then sends a broadcast bus setting instruction to the broadcast service trunk through the control line. Then, the bus is established and at the same time a communication initiation message is sent to the originating subscriber, completing the broadcast call setup. As can be understood from the above description, in the conventional system, it is necessary for the exchange to always have relationship information between the originating subscriber line and a plurality of terminating subscriber lines and to perform mutual control.

The result is a significant increase in the complexity of the switch software. Therefore, it is almost impossible to provide a new broadcast service by adding new broadcast service software to existing software. In reality, a new system would have to be created, but even in that case, the increase in the number of software components and the lengthening of the development period would increase the cost of the system, which was by no means a desirable situation. Therefore, it is an object of the present invention to eliminate the drawbacks of the conventional control system, such as the complexity of controlling switching equipment and the increase in the number of software components, and to provide a multi-address system that simplifies the control of switching equipment and requires a small number of software components. The objective is to provide a communication control method.

In the multi-address communication control system of the present invention, the exchange itself is not particularly complicated, and a multi-address control device that is also regarded as a counterpart exchange is attached to the exchange via input/output trunk lines, thereby simplifying the overall system. The aim is to obtain a flexible device.

That is, according to the present invention, in a communication control system that performs simultaneous communication from an originating subscriber connected to a data exchange line to a plurality of terminating subscribers, the originating subscriber A multi-address control device is attached to the receiver and each of the terminating subscribers through an outgoing trunk line and an incoming trunk line, respectively, which are connected through the exchange. means for detecting and controlling a calling signal and a recovery signal of a plurality of incoming subscriber lines; and means for receiving selection signals of a plurality of incoming subscribers transmitted through said outgoing trunk line, and using said received selection signal to call each said incoming trunk line. means for controlling mutual bus connections between the outgoing trunk line and the plurality of incoming trunk lines, and monitoring the connection status of the originating subscriber and each of the terminating subscribers by each trunk line. The system is characterized by comprising means for controlling a connection confirmation operation between subscribers, and means for transmitting commands and confirmation information for call connection to the outgoing connection trunk line and the incoming connection trunk line. A multi-address communication control method is obtained.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the multi-address communication system of the present invention. This embodiment shows a case in which a broadcast communication control method, which is one of the multi-address control methods, is applied to a telecommunications exchange line. Telex terminal equipment TLX1 to TLX4 and telex terminal equipment TLX5 are connected to the telex exchange 11 via the telex exchange 12. The telex exchange 11 has an exchange switch 13 for making exchange connections, a broadcast control device 14, and a central control device 15 for controlling exchange connections. Further, the telex exchanges 11 and 12 are connected by an inter-office line. The configuration of the broadcast control device 14 is a bit complicated as it has several functions as described below, but it can be simplified by using a general-purpose microcomputer that has been widely used in recent years, and it can also be modified depending on how it is used. Various types of circuits can also be used.

Therefore, we will first explain what functions this device has within the scope of Figure 1, and then show an example of a general circuit and explain how that circuit performs the above functions. Then, as another embodiment, an example of a circuit using a general-purpose microcomputer will be explained. Therefore, first, the telex terminal device TLX1 is set as the originating subscriber of the broadcast communication, and the telex terminal device TLX2 to TL
The control operation when performing broadcast communication with X5 as the receiving subscriber will be explained below with reference to FIG.

(1) The originating subscriber TLXl sends a special selection signal (special number) indicating a request for broadcast communication service specified by the Telecommunications Service. (2) When the telex switch 11 detects the selection signal, it hunts the broadcast control device using the special number and sends a paging signal to the line 21 between the exchange switch 13 and the broadcast control device 14, that is, the outgoing trunk line (0GT line). Send.

The broadcast control device receives the calling signal from the line 21 and sends a calling confirmation signal to the exchange switch 13. Then, it receives a response signal from the broadcast control device 14 through the line 21, and connects the bus between TLX1 and the line 21. Thereafter, the control state of the exchange is the same as the general communication state for this call, and it is not concerned with any information other than the recovery signal. (3) After returning a response signal to the calling subscriber in response to the call to the line 21, the broadcast control device 14 sends the call to the line 21 in order to start transmitting a selection signal for the called subscriber to the calling subscriber. Send selection start message characters. (4) The broadcast control device that has received the selection signal from the originating subscriber calls line 22, that is, the incoming trunk line IGT, and after receiving the response from exchange switch 13, calls the line 22 in the same manner as it received the selection signal. Send. (5)
The exchange switch 13 and the central control unit 15 respond to the call from the line 22, receive the selection signal, call the telex terminal TLX2 corresponding to the selection signal as the called subscriber, and perform the same process as in the general connection. TLX2 and line 2
Connect the 2nd bus.

Then, the called subscriber receives a Who Are You signal (WHOAR).
EYOU signal or WRU signal) to cause the called subscriber's answer back to be sent back to the calling subscriber. Thereafter, the call status is set to a communicating status. In this case, there is no need to be conscious of the relationship with the call described in (2). (
6) Broadcast control device 14 confirms the passage of the answer bus, immediately disconnects the buses of lines 21 and 22, sends a Z polarity (signal to maintain communication) to line 22, and switches to line 21. Transmit the characters of the selection start message in the same manner as described in (3). (7) Next, TLX3, TLX4,
Similarly, for TLX5, see (4) and (5) above.
, (6) are repeated.

(8) After confirming the passage of the answer block of TLX5, the broadcast control device 14 connects the buses of lines 22 to 25 from the line 21, and transmits the answer block of TLXl to the buses of TLX2 to T
It is returned to LX5, and a communication start character is sent to line 21.

(9) Messages sent from the calling subscriber are simultaneously sent to each called subscriber via the exchange switch 13 and the broadcast control device 14.

For example, when TLX4 is restored, the exchange detects this and disconnects the bus between TLX4 and line 24 and restores it.

The broadcast control device detects the recovery signal from TLX4 through the telex exchange, and sends the recovery confirmation signal back to the exchange. Charging information is then found from line 24 to line 21 and accumulated to the originating subscriber of TLXl. TLX
When l is restored, the restoration signal is sent through the bus to TLX2~5.
Therefore, restoration processing is performed for all lines as in the example of TLX4 above. (During 1a transmission, the WRU signal from the originating subscriber is constantly monitored, and when this is detected, the bus from TLX1 to TLX2 to TLX5 is temporarily cut off, the answer back signal from each terminating subscriber is received and stored, and the signals are sequentially transmitted.) The answer pack accumulated by each called subscriber is sent to the side circuit.

Thereafter, all answer calls from currently connected incoming subscribers are sent to the originating line, and the bus status is then restored to its original monitoring status. As can be seen from the above explanation, in realizing the broadcast communication service, according to this control method, the central control unit 15 and the exchange switch 13 are operated by software that only performs billing processing without any special processing, as in the case of general connections. Broadcast communication can be controlled by changing .

However, if this billing process is limited to the creation of exchange notes only, this change is not necessary. Next, a specific example of a circuit device that performs the above functions will be described.

FIG. 2 is a block diagram showing the configuration of the embodiment shown in FIG. 1 in slightly more detail.

Reference numerals 13 and 14 separated by dashed lines represent the exchange switch and broadcast control device shown in FIG. 1, respectively. The telex terminals TLX1-TLX5 are shown as they are in FIG. In the exchange switch 13, the WRU call signal from the telex terminal TLXl is converted into a signal at a predetermined level by the current level conversion circuit 31, and becomes a characterized call signal in the level transmission flip-flop FF, and is time-division multiplexed. The signal is sent to the broadcast control device 14 via the circuit 33, the time division highway 34, and the time division separation circuit 35.

This broadcast control device 14 receives the calling signal from the exchange switch 13 through the level reception FF 4l, and detects it in the call restoration level detection circuit 42. The detection signal is sent to the broadcast sequence control circuit 43. Next, a response signal to the exchange switch 13 changes the level transmission FF 45 via the level control circuit 44 according to the control signal from the broadcast sequence control circuit 43, and is sent to the exchange switch 13, and then reaches the originating subscriber. . Characters are transmitted and received with the exchange switch as data converted into characters by a character assembly/disassembly circuit 46 via an input data bus 47 and an output data bus 48.

Once the selection signal is received from the input data bus 47 into the selection signal receiving/storing/transmitting circuit 49, it is held in this circuit until the call is terminated.

A selection signal to the exchange for outgoing connections (incoming connections from the point of view of the exchange) is sent through the output data bus 48 and the character assembly/disassembly circuit 46. During communication, characters input from one character assembly/disassembly circuit 46 through the data transfer circuit 50 are sent out to a plurality of exchange lines through the output data bus 48 and the character assembly/disassembly circuit 46.

WR sent by the calling subscriber to confirm the answer backup
The U signal is detected by the WRU signal detection circuit 51.

Thereafter, the answer back signal sent from the destination line is sent to the character assembly/disassembly circuit 46 and the input data bus 47.
Answer block passage detection/accumulation/transmission circuit 52 via
The data is stored in a memory corresponding to each line in the memory and sequentially transmitted to the originating line through the output data bus 48 and the character assembly/disassembly circuit 46. The communication start message is sent to the message transmitting circuit 5.
3 is transmitted to the originating line via the output data bus 48 and the character assembly/disassembly circuit 46.

The recovery signal from the line is input to the call recovery level detection circuit 42 via the exchange switch 13 and the level reception FF 4l, and the broadcast sequence control circuit 43 performs recovery control. All of the above series of controls are performed by the broadcast sequence control circuit 43.

Note that 54 is a clock distribution circuit. From the above explanation, it can be seen that the device shown in FIG. 2 performs the function of the device of the present invention explained using FIG. Ru.

Next, a device using a circuit using a general-purpose microcomputer will be explained.

FIG. 3 is a block diagram showing only the broadcast control device 14 in the circuit of the second embodiment of the present invention having the above-mentioned configuration.

The level receiving FF 41, the level transmitting FF 45 and the clock distribution circuit 54 are the same as in the case of FIG. The other main parts of this circuit are a central processing unit 61 using a general-purpose microcomputer as it is, a read-only memory 62 which is a program that executes the central processing unit, a random access memory 63, and address data control. It has a bidirectional bus 64. Of the above, the central processing unit 61 and the random access memory 63 collectively possess some functions of some of the many circuits of the device shown in FIG. That is, the latter random access memory 63 includes a call origination/recovery level conversion detection circuit 42, a selection signal reception/accumulation/transmission circuit 49, a data transfer circuit 50, a WRU signal detection circuit 51, an answer block passage/detection, accumulation/transmission It has the memory part of each function of the circuit 52 and the message transmission circuit 53, while the central processing unit (microcomputer) 61 that controls this has the functions of each circuit and the memory part shown in the description of the random access memory 63 above. It has a function of processing the character assembly/separation circuit (however, the data transfer circuit 50 indirectly uses the broadcast sequence/control circuit 46). Since this embodiment consists of very few blocks, it is impossible to explain the operation of this embodiment circuit by circuit using this diagram, as in the case of the diagram in FIG. It can be seen that the arrangement is substantially the same as the embodiment of FIG. 2, and as a result there is a device that performs each of the functions described with reference to FIG. In the above two embodiments, a method is shown in which selection signals are received from the calling subscriber and connections are made sequentially. It is also possible to connect to

Further, in the above embodiment, the receiving subscriber selection signal is sent from the calling subscriber in order to receive the calling subscriber selection signal, but instead of this, a speed dialing method is used, and the calling subscriber selection signal itself is sent from the exchange. It goes without saying that it may be received as a signal. Although the above embodiments are for broadcast communication, almost the same configuration can be used for conference communication by replacing the broadcast control device with a conference control device.

However, the difference from the case of broadcast communication is that the control of the mutual bus between the outgoing trunk line and each incoming trunk line mentioned earlier is only described for the case of connection control, but in conference communication It is necessary to control bus changes, and the control of protocols (rules) during communication is accordingly different. Note that this mutual bus change control can also be called connection control in a broad sense. Further, although a telex exchange is used as the converter, it goes without saying that other ordinary exchanges may be used. As can be seen from the above description, according to the multi-address control method of the present invention, a new multi-address control device such as a broadcast control device or a conference control device can be added without making any changes to the conventional exchange system. The advantage is that you only need one.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the multi-address control system of the present invention, FIG. 2 is a block diagram of an exchange switch and broadcast control device in the device of FIG. 1, and FIG.
FIG. 2 is a block diagram of an embodiment of the invention. Explanation of symbols: 11 is a telex exchange, 13 is an exchange switch, 14 is a broadcast control device (multi-address control device)
, 15 is a central control unit, 21 is an outgoing trunk line, 2
2 to 25 are incoming trunk lines, 41 is a level reception flip-flop, 42 is a call recovery/level detection circuit, 43
4 is a broadcast sequence control circuit, 44 is a level control circuit, and 4 is a broadcast sequence control circuit.
5 is a level transmission flip-flop; 46 is a character assembly/disassembly circuit; 49 is a selection signal reception/accumulation/transmission circuit;
50 is a data transfer circuit, 51 is a WRU signal detection circuit, 5
2 is an answer block passage detection/accumulation/transmission circuit, 53 is a message transmission circuit, 54 is a clock distribution circuit, and TLXl.
is the originating subscriber, and TLX2 to TLX5 are the receiving subscribers, respectively.

Claims (1)

[Claims] 1. In a communication control system that performs simultaneous communication from an originating subscriber connected to a data exchange line to a plurality of terminating subscribers, a A multi-address control device is attached to the terminal via an outgoing trunk line and an incoming trunk line, which are respectively connected through the exchange. means for detecting and controlling the
means for receiving selection signals of a plurality of incoming subscribers sent through the outgoing trunk lines, and calling and transmitting the received selection signals to each of the incoming trunk lines; means for controlling mutual path connections of incoming trunk lines; means for monitoring the connection status of the calling subscriber and each of the terminating subscribers through each trunk line, and controlling a connection confirmation operation between the subscribers; A multi-address communication control system comprising: means for transmitting commands and confirmation information for call connection to the outgoing trunk line and the incoming trunk line.