JPS62130051A - Interruption incoming connection system for videotex terminal equipment - Google Patents

Abstract

PURPOSE:To improve the talking finish rate of an exchange network and the service performance by detecting an interruption request to a videotex terminal equipment, informing it to a center station, holding a channel with an exchange and resetting the channel after the end of interruption incoming. CONSTITUTION:When an interruption incoming connection request to a telephone set 2a in a videotex terminal equipment 2 is generated from a subscriber telephone set 6 during the communication between the equipment 2 and a center station 1, an incoming controller 5 in an exchanger 3 detects it and informs the result to the station 1 and the device 2. Then the connection state of he channel to the stations 1, 3 is held and the device 2 receives the interruption incoming call. The controller 5 confirms the operation above and applies the interruption incoming connection. Thus, the talking between the telephone sets 6 and 2a is attained. After the end of the interruption talking by on-hook is finished, when the off-hook of the telephone set 2a is detected. the controller 5 changes over the connection in the device 2 to reset the channel with the station 1. Thus, the communication between the device 2 and the station 1 is restarted.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION INDUSTRIAL FIELD OF THE INVENTION The present invention relates to an interrupt termination connection scheme for use in exchanges accommodating Videotex terminal equipment.

In conventional technology exchanges, when an incoming connection request is received from a third party to a telephone that is currently on a call, the call path of the other party's telephone is kept on hold based on the receiving party's indication of intent, such as a hooking operation. Interrupt call connection (Call during call ) method is adopted.

Problems to be Solved by the Invention The above-mentioned conventional interrupt termination connection system is a service intended for general telephone sets, and is not applied to Videotex terminal equipment that transmits and receives data signals via a modulation/demodulation device.

In reality, the conversation time between the Videotex terminal device and the center station is prolonged (depending on the amount of communication), and the call completion rate to the Videotex terminal decreases accordingly.

Therefore, with the spread of Videotex, it is strongly desired by both users and service providers to realize interrupt incoming connection to the terminal device.

Structure of the Invention The interrupt incoming call connection method for Videotex terminals of the present invention which solves the problems of the prior art described above is such that an interrupt incoming call connection request from a general telephone to the Videotex terminal is received during communication between the Videotex terminal device and the center station. It notifies the Videotex terminal of the occurrence of this interrupt incoming connection request and also notifies the center station, thereby putting the communication path with the exchange on hold. When it detects the disappearance of the carrier for the call, it connects an interrupt call, and when it detects the end of the call, it restores the line on the interrupt side and re-establishes the communication path between the Videotex terminal equipment and the center station. There is.

Hereinafter, the operation of the present invention will be explained in detail together with examples.

Embodiment FIG. 1 is a block diagram showing the configuration of a portion of a switching system to which an interrupt termination connection method according to an embodiment of the present invention is applied.

This exchange system consists of a videotex center station l,
It is composed of a videotex terminal device 2, an exchange 3.4 between the center station and the terminal device, and an interrupt termination control device 5 installed in the exchange 3.

FIG. 2 is a block diagram showing the configuration of the interrupt termination control device 5 of FIG. 1. As shown in FIG.

In FIG. 2, 11 is a terminal on the exchange side connected to the Videotex center office 1 via the line link frame of the exchange 3 in FIG. 1 and the exchange 4, and 12 is the Videotex terminal in FIG. Subscriber side terminal connected to device 2, 1
Reference numeral 3 denotes a terminal on the exchange side connected to the telephone 6 of FIG. 1 which issues an interrupt call request. Further, 14, 15 and 16 are switching contacts, 17 is an upstream carrier signal generation unit, 18 is an interrupt incoming notification signal sending unit, 19 is an incoming call detection unit, 2o is an upstream carrier monitoring unit, 21 is a relay drive unit, and 22 is a control unit. Department,
23 is a communication path section.

In addition, in FIG. 2, for convenience of illustration, the up and down communication paths are shown as being common.

FIG. 3 is a communication sequence diagram showing a control procedure for interrupt reception performed in the switching system of FIGS. 1 and 2. FIG.

First, in response to a call from Videotex terminal device 2,
It is assumed that the center station 1 is called according to a well-known connection procedure, communication between the two is started, and communication is in progress as shown in FIG.

In this state, the subscriber side terminal 12 in the communication path section 23 shown in FIG. 2 is connected to the exchange side terminal 11 connected to the center office 1 via the switching contacts 16 and 15. It is assumed that during this call, a call is made from the subscriber's telephone 6 to the telephone 2a in the Videotex terminal device 2.

It is assumed that this transmission generates an incoming call connection request at the exchange side terminal 13 in FIG. This incoming connection request is detected by the incoming call detection section 19 and notified to the control section 22. Control part 2
2 interrupts the incoming connection request generated on the terminal 13 when the telephone 2a associated with the incoming call connection request is busy and the parenthesized telephone 2a is identified as a subscriber of the interrupt incoming call connection service from the service type. Determines it as an incoming connection request.

The control unit 22 that made this determination receives the monitoring result from the uplink carrier monitor unit 20. When the control unit 22 detects that the telephone 2a is communicating with the center station 1 based on the monitoring result, it starts the incoming call connection control of this embodiment. Note that in other cases, that is, when the telephone 2a is in communication with a regular telephone, the conventional interrupt incoming call connection between the regular telephones is performed.

The control unit 22 activates the upstream carrier generation unit 17 and sends a predetermined modulated wave indicating that a call interruption request has occurred to the center office 1 via the switching contact 14 and the exchange side terminal 12. The station 1 is made to suspend the connection state of the communication path to the switching station 3. Next, the control unit 22 activates the interrupt incoming call notification signal sending unit 18 and switches the switching contact 16 to send a notification that an interrupt incoming call has occurred from the subscriber side terminal 12 to the Videotex terminal device 2. do.

This notification is displayed in a predetermined display area allocated to the periphery of the CRT display screen in the Videotex terminal device 2, or by sounding a buzzer.

As a result, the terminal operator, who has learned of the occurrence of the interrupt call request, expresses his intention to accept the interrupt call by off-hooking the telephone 2a and stopping carrier transmission based on switching to the telephone side.

When the control unit 22 confirms the intention of the terminal operator based on the notification of disappearance of the uplink carrier from the upstream carrier monitor unit 20, the control unit 22 switches between the subscriber side terminal 12 and the exchange side terminal 13 by switching the switching contacts 16 and 15. By connecting, an interrupt incoming connection is made. This allows communication between the telephone 2a and the telephone 6.

When the control unit 22 detects the end of the interrupt incoming call based on the on-hook of the telephone 2a, it restores the call path on the interrupt side and waits for the appearance of an uplink carrier on the subscriber side terminal 12.

After the interrupt call path ends due to off-hook, the operator on the Videotex terminal side 2 takes telephone 2a off-hook, operates the Videotex button, and switches to the modem side to resume communication with the center station. request. The control unit 22 detects this and controls the switching contacts 15 and 16.
The subscriber side terminal 12 is again connected to the exchange side terminal 11 connected to the center office 1 via the terminal 12. As a result, the terminal device 2
Communication with the center station L is resumed.

Above, we have exemplified a configuration in which the telephone on the receiving side goes off-hook once after the end of the interrupt incoming call, and then goes off-hook again.However, the configuration is such that the end of the incoming interrupt call is detected from the on-hook of the interrupt side type, and the called party modulates and demodulates while off-hook. It may also be possible to switch to the side.

Effects of the Invention As explained in detail above, the interrupt call connection method of the present invention detects an interrupt call connection request from a general telephone to a Videotex terminal, and notifies the center station of the occurrence of this interrupt call connection request. As a result, the communication path with the exchange is put on hold, and subsequent off-hook of the receiving telephone, disappearance of the carrier, and appearance of the carrier are sequentially detected, and the communication path is reset after the interruption of the incoming call and the termination of the call. This has the effect of improving both the service to users and the call completion rate of the switching network.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an exchange system to which an interrupt termination connection method according to an embodiment of the present invention is applied, FIG. 2 is a block diagram showing the configuration of the interrupt termination control device 5 of FIG. 1, and FIG. is a communication sequence diagram including the operation of the above embodiment. 1. Center station for Videotex, 2. Terminal device for Videotex, 3.4. Switching station, 5. Interrupt call control device installed in switching center 3, 11. Replacement shown in Figure 1. Terminals on the exchange side connected to the Videotex center station l via the line link frame of the station 3 and the exchange station 4, 12...Subscriber side terminals connected to the Videotex terminal device 2 in FIG. 1, 13.・Terminals on the exchange side connected to the telephone set 6 in FIG. 1 that issues an interrupt incoming request, 14, 15 and 16... switching contacts, 17... upstream carrier signal generation unit, 18... interrupt incoming notification signal sending unit, 19... Incoming call detection section, 20. Up carrier monitor section, 21. Relay drive section, 22. Control section, 23. Communication path section. Figure l Figure 2

Claims (1)

[Claims] An interrupt incoming call connection method in an exchange accommodating a Videotex terminal device, which handles an interrupt incoming call connection request from a general telephone to the Videotex terminal during communication between the Videotex terminal device and a center office. It notifies the Videotex terminal of the occurrence of this interrupt incoming connection request and also notifies the center station, thereby putting the communication path with the exchange on hold. When it detects the disappearance of the carrier to the station, it performs an interrupt incoming call connection, and when it detects the termination of this interrupt incoming call, it restores the line on the interrupting side and resets the communication path between the Videotex terminal equipment and the center office. Interrupt call connection method for Videotex terminals.