JPH0530183A - Line switching system - Google Patents

Abstract

PURPOSE:To prevent the deterioration in data communication service in a common system between data communication and telephone communication by controlling call time by means of telephone communication at the succeeding time of a system tone generated when telephone communication completes. CONSTITUTION:A call-side telephone exchange 2a starts a system tone generation circuit 8a by the completion of the call of telephone sets 6a and 6b generates the system tone. A system tone detection circuit 9a supervises the succeeding time, and it is transmitted to an incoming-side through a line 7. A system tone generation circuit 9b supervises succeeding time. Since time reaches a set point, or when it stops for more than prescribed time, a control signal is transmitted to exchanges 2a and 2b. They detect the termination of the call when they receive the control signal or the telephone set 6a detects compulsory cut. Changeover switches 4a and 4b are restored, and data exchanges 1a and 1b are connected to the line 7 through MODEM 3a and 3b so as to provide for data communication.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line switching system in a system in which a line is shared by data communication and telephone communication.

[0002]

2. Description of the Related Art FIG. 3 shows, for example, JP-A-56-126364.
FIG. 7 is a relay system diagram showing a conventional line switching system disclosed in Japanese Patent Publication No. In the figure, 1a and 1b are data exchanges, and 2a and 2b are telephone exchanges sharing a common line with this data exchange 1a or 1b. Reference numerals 3a and 3b are modems connected to the data exchange 1a or 1b.

4a and 4b are data exchanges 1a or 1
b is a change-over switch for connecting the telephone switch 2a or 2b directly to the line to be described later via the modem 3a or 3b. 5a and 5b are data terminals accommodated in the data exchange 1a or 1b,
6a and 6b are telephones housed in the telephone exchange 2a or 2b. 7 is a selector switch 4a, 4b at both ends thereof
Is the line provided.

Next, the operation will be described. Since the changeover switches 4a and 4b are normally set on the side of the data exchanges 1a and 1b, the data communication between the data terminals 5a and 5b is performed by the data exchange 1a-the modem 3a-the changeover switch 4a-.
It is performed through the route of line 7-changeover switch 4b-modem 3b-data exchange 1b.

When a call is made from the telephone 6a to the telephone exchange 2a and the telephone number dialing of the telephone 6a is sent, the telephone exchange 2a activates the data exchange 1a and transfers the dial information. . The activated data exchange 1a sends the dial information to the data exchange 1b via the line 7. The data exchange 1b, which has received the dial information, activates the telephone exchange 2b and transfers the dial information to the telephone exchange 2b when there is a response.

Based on this dial information, the telephone exchange 2b discriminates whether the called telephone 6b of the desired party is idle or busy and returns the response information to the data exchange 1b.
The data exchange 1b sends this response information to the data exchange 1a through the line 7. Since the data exchange 1b does not need to hold the telephone exchange 2b, the disconnection / response signal is transmitted / received.

The response information is transferred from the data exchange 1a to the telephone exchange 2a, and the telephone exchange 2a sets a path from the calling telephone 6a to the changeover switch 4a based on the response information when the desired telephone 6b is idle. To wait for connection / response of the incoming telephone 6b, and when busy,
Make a busy tone connection. In this case as well, the data exchange 1a does not need to hold the telephone exchange 2a, and therefore transmits / receives the disconnection / response signal.

After receiving the response information from the data exchange 1b, the data exchange 1a returns confirmation information to the response information. Upon receiving this confirmation information, the data exchange 1b controls the changeover switch 4b to switch the line 7 to the telephone exchange 2b side.

When the changeover switch 4b is changed over, the carrier signal transmitted from the modem 3b to the line 7 is cut off. When the data exchange 1a, which constantly monitors the carrier signal, detects the disconnection of the carrier signal, it controls the changeover switch 4a to switch the line 7 to the data exchange 2a side.

As a result, a line signal is sent from the telephone exchange 2a to the telephone exchange 2b through the changeover switch 4a, the line 7 and the changeover switch 4b. The telephone exchange 2b calls the designated telephone 6b and connects it to the line 7 to make a desired call.

When the call ends, the telephone exchanges 2a and 2b that have detected the call end activate the data exchanges 1a and 1b and restore the changeover switches 4a and 4b. As a result, the line 7 is connected to the modems 3a and 3b to prepare for data communication.

[0012]

Since the conventional line switching system is constructed as described above, when telephone communication is started, data communication cannot be performed until the telephone call ends, and the common line is used for data communication. In a system in which communication and telephone communication are shared, there is a problem that the serviceability of data communication is impaired.

The present invention has been made to solve the above problems, and provides a line switching system capable of improving the serviceability of data communication in a system in which the line is shared by data communication and telephone communication. The purpose is to get.

[0014]

According to a first aspect of the present invention, there is provided a line switching system in which a system tone generating circuit is activated by a telephone exchange on the calling side to generate a system tone when a call connection is completed. When the detection circuit detects that the duration of the system tone has reached a predetermined value, the telephone exchanges on the originating side and the terminating side activate their respective data exchanges to instruct the recovery of the changeover switch.

Further, in the line switching system according to the present invention as defined in claim 2, when the call connection is completed, the system tone generating circuit is activated by the network control / switching unit on the calling side to generate a system tone, and the system tone is detected. When the circuit detects that the duration of the system tone has reached a predetermined value, the network control / switching units on the originating and terminating sides activate the respective control units to instruct the restoration of the changeover switch. .

[0016]

According to the line switching system of the present invention, the line for data communication and the telephone communication is controlled by controlling the call time by the telephone communication based on the duration of the system tone generated from the completion of the call connection for the telephone communication. To realize a line switching method that can prevent deterioration of serviceability of data communication in a system shared by and.

[0017]

EXAMPLES Example 1. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a relay system diagram showing an embodiment of the invention described in claim 1. In the figure, 1a and 1b are data exchanges, 2a and 2b are telephone exchanges, 3a and 3b are modems, 4a and 4b are changeover switches, 5a and 5b are data terminals, 6a and 6b are telephones, and 7 is a line, Since the parts are the same as or equivalent to those of the conventional device denoted by the same reference numerals in FIG. 3, detailed description thereof will be omitted.

Reference numerals 8a and 8b denote system tone generating circuits which are activated by the telephone exchange 2a or 2b when the call connection is completed and generate a system tone. 9a, 9
b has a built-in timer and monitors the duration of the system tone generated by the system tone generating circuit 8a or 8b. When the duration reaches a predetermined value, a control signal is generated to notify the telephone exchange 2a or 2b. It is a system tone detection circuit for notifying.

Next, the operation will be described. Here, since the operation from the calling side telephone 6a to the connection of the telephone 6a to the receiving side telephone 6b is the same as the conventional case, the description thereof is omitted.

When the call exchange between the telephone sets 6a and 6b is completed by the telephone exchange 2a on the originating side and the telephone exchange 2b on the receiving side, the telephone exchange 2a on the originating side activates the system tone generating circuit 8a. Generate a system tone.

The system tone generated by the system tone generation circuit 8a is the system tone detection circuit 9 on the originating side.
The duration is monitored at a and is also sent to the receiving side through the line 7 from the changeover switch 4a. The receiving side sends the system tone received via the changeover switch 4b to the system tone generating circuit 9b to monitor the duration.

When the system tone detection circuits 9a and 9b detect a system tone, they activate a built-in timer to start counting, and when the duration of the system tone reaches a predetermined value preset in the timer. , Or when the system tone is stopped for a certain time or longer, the control signal is sent to the telephone exchange 2a or 2b.
Send to. The system tone detection circuit 9a,
The predetermined value set in the timer 9b can be changed.

Whether the telephone exchanges 2a and 2b receive a control signal from the system tone detection circuit 9a or 9b,
When it is detected that the calling side telephone 6a is forcibly disconnected, the end of the call is detected, and the data exchange 1a or 1
b is activated to instruct the recovery of the changeover switches 4a and 4b. When the changeover switches 4a and 4b are restored, the data exchanges 1a and 1b are connected to the line 7 through the modem 3a or 3b to prepare for data communication.

Example 2. In the above embodiment, the case where the data exchange and the telephone exchange are connected to the line by the changeover switch is explained as the system in which the data communication and the telephone communication share the common line, but the data terminal is connected. May be applied to a system in which the control unit and the network control / switching unit to which the telephone is connected share a common line,
The same effect as that of the above embodiment is obtained.

FIG. 2 is a relay system diagram showing an embodiment of such an invention described in claim 2. The same parts as those in FIG. 1 are designated by the same reference numerals to avoid duplication of description. . In the figure, 10a and 10b are control units that house the data terminals 5a and 5b instead of the data exchanges 1a and 1b and control the changeover switches 4a and 4b, and 11a and 11b replace the telephone exchanges 2a and 2b. A network control / switching unit that accommodates the telephones 6a and 6b and receives control signals from the system tone generation circuits 9a and 9b.

Reference numerals 12a and 12b denote control units 10a and 1
0b, network control / switching units 11a, 11b, modems 3a, 3
b, the changeover switches 4a and 4b, the system tone generation circuits 8a and 8b, and the system tone detection circuits 9a and 9b are integrally housed and connected to both ends of the line 7.

Since the operation is the same as that of the embodiment shown in FIG. 1, its explanation is omitted.

[0028]

As described above, according to the present invention, the call duration of the telephone communication is controlled based on the duration of the system tone generated when the call connection for the telephone communication is completed. , The effect of providing a line switching method that can prevent deterioration of serviceability of data communication in a system in which the line is shared by data communication and telephone communication and optimally control the overall serviceability of data communication and telephone communication There is.

[Brief description of drawings]

FIG. 1 is a relay system diagram showing a line switching system according to an embodiment of the present invention.

FIG. 2 is a relay system diagram showing an embodiment of the invention described in claim 2;

FIG. 3 is a relay system diagram showing a conventional line switching system.

[Explanation of symbols]

1a, 1b data exchange 2a, 2b telephone exchange 3a, 3b modem 4a, 4b changeover switch 5a, 5b data terminal 6a, 6b telephones 7 lines 8a, 8b system tone generation circuit 9a, 9b System tone detection circuit 10a, 10b control unit 11a, 11b Network control / switching unit

Claims (2)

[Claims] 1. In a line switching system in a system in which a line is shared by data communication and telephone communication, changeover switches are provided at both ends of the line, and the line is transferred to a data exchange via a modem or directly by the changeover switch. Switch connection to the telephone exchange, send dial information from the telephone exchange on the calling side to the data exchange on the called side via the data exchange on the calling side, and the data exchange on the called side switches the changeover switch to the telephone exchange by the response and confirmation. The line switch of the receiving side, the data exchange of the transmitting side identifies the line switching of the receiving side that has detected the carrier signal disconnection from the modem of the receiving side due to the line switching,
By setting the changeover switch on the caller side to the telephone exchange side and switching the line on the caller side, a call connection is established between the caller side telephone and the callee side telephone. When the call connection is completed, the caller side is connected. The telephone exchange of (1) activates a system tone generating circuit to generate a system tone, and a system tone detecting circuit monitoring the duration of the system tone detects that the duration has reached a predetermined value. Then, the telephone exchanges on the originating side and the terminating side detect the end of the call and activate the respective data exchanges to instruct the restoration of the changeover switch. 2. In a line switching system in a system in which a line is shared by data communication and telephone communication, changeover switches are provided at both ends of the line, and the line is transferred to a control unit via a modem or directly by the changeover switch. The connection is switched to the network control / switching unit, and the dial control information is sent from the network control / switching unit on the calling side to the control unit on the called side via the control unit on the calling side. The changeover switch is set on the side of the network control / switching unit to switch the line on the receiving side, and the control unit on the transmitting side detects the carrier signal disconnection from the modem on the receiving side due to the line switching. The line switch is identified, and the switch on the calling side is set to the network control / switching part side to switch the line on the calling side to establish a call connection between the calling side telephone and the called side telephone. When the call connection is completed, the network control / switching unit on the calling side activates a system tone generation circuit to generate a system tone, and a system tone detection circuit that monitors the duration of the system tone, When it is detected that the duration has reached a predetermined value, the network control / switching units on the calling side and the receiving side detect the end of the call, and activate the respective control units to restore the changeover switch. Line switching method characterized by giving instructions.