JPH05236533A - Modem sharing system for isdn exchange - Google Patents

Abstract

PURPOSE:To economically provide a modem sharing service without considerably changing an ISDN exchange. CONSTITUTION:A modem group 7 is connected to an analog subscriber's line group 6 to which the representative number service is set. An ISDN terminal adapter group 11 is connected to an ISDN subscriber's line group 12 to which the representative number service is set, and respective terminal adapters of the ISDN terminal adapter group 11 are connected to respective modems of the modem group 7 in 1:1. Each differentiating circuit of differentiating circuit groups 9 and 10 has one end connected to a modem and has the other connected to a terminal adapter and generates a NOT signal having a certain width by the fall of a carrier detection signal. Data signals of the modem and the terminal adapter are mutually connected through a confounding line 8 based on the connection request of a data terminal on the transmission side. When the communication line of one of data terminals 1 and 15 is disconnected, the communication of the other is disconnected by the NOT signal pulse outputted from the differentiating circuit 9 or 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modem sharing system in which a plurality of shared modems are provided, and an empty modem is selected from these modems to be used, and more particularly to a modem sharing system of an ISDN exchange.

[0002]

2. Description of the Related Art In a conventional modem sharing system, a dedicated device provided with a modem, a terminal adapter, a communication path interface circuit, and a control circuit in order to directly connect and control a shared modem and a terminal adapter to a communication path. Is used.

[0003]

In the conventional modem sharing system, the device configuration is complicated, a modem and a terminal adapter dedicated to this device are required, and the modem sharing service is directly connected to the communication path. There is a problem in that the exchange requires a control program dedicated to the modem sharing service in order to provide the service.

[0004]

A modem sharing system for an ISDN exchange according to the present invention includes a plurality of modems connected to an analog subscriber line accommodated in the ISDN exchange and having a representative number service set, and the ISDN exchange. A plurality of terminal adapters connected to the ISDN subscriber line in which the accommodated representative number service is set and corresponding to the plurality of modems on a one-to-one basis, one to the modem and the other to the terminal adapter. And a plurality of differentiating circuits that generate negative signal pulses of a certain width when the carrier detection signal falls, and based on a connection request from the originating terminal, the data signals of the modem and the terminal adapter are connected via an interlinking line. Connect to each other to form a communication path between the calling and called terminals, and either one of the calling and called terminals When the communication path of the terminal is disconnected, a configuration disconnecting the communication path of the other terminal corresponding the negative signal pulses output from the differentiating circuit, also,
The ISDN exchange modem sharing method of the present invention is based on ISDN.
A plurality of modems connected to an analog subscriber line accommodated in the exchange and having a representative number service set up;
A plurality of terminal adapters that are connected to the ISDN subscriber line accommodated in the SDN exchange and set to the representative number service and that correspond to the plurality of modems in a one-to-one correspondence
The ISDN exchange is provided with a disconnection control unit for controlling disconnection of a communication path of a terminal of a calling side or a called side, and the modem and the terminal terminal based on a connection request from the terminal of the calling side.
The data signals of the adapter are connected to each other via an interlacing line to form a communication path between the caller side and the callee side terminals, the disconnection of the caller side and callee side terminals is monitored, and one of these terminals is connected. When the disconnection request is received, the disconnection control unit may disconnect the communication path of the corresponding other terminal.

[0005]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram for explaining a first embodiment of the present invention. The data terminal 1 is connected to an analog subscriber line 3 via a modem 2 and is connected to an ISDN exchange 5 via a public telephone network 4. The data terminal 15 is an IS via the ISDN terminal adapter 14.
It is connected to the DN subscriber line 13. Each modem of the modem group 7 is connected to an analog subscriber line, and the analog subscriber line is accommodated in the ISDN exchange 5 to form an analog subscriber line group 6 and a representative number service is set. ISDN terminal adapter group 1
1 is that each terminal adapter is connected to the ISDN subscriber line, and the ISDN subscriber line is IS
The ISDN subscriber line group 12 accommodated in the DN exchange 5 is formed and a representative number service is set. Further, the modems of the modem group 7 and the ISDN terminal adapters of the ISDN terminal adapter group 11 are connected to the respective data terminals (not shown) by the interlaced wires 8, and the respective carrier wave detection terminals (not shown) are connected to each other. It is connected to corresponding terminal preparation terminals (not shown) via the differentiating circuit group 9 and the differentiating circuit group 10.

First, the data terminal 1 makes a call and the data terminal 1
The case of communicating with the No. 5 will be described. The data terminal 1 uses the modem 2 to make a call to the representative number of the analog subscriber line group 6 to which the modem group 7 is connected. ISDN exchange 5
Selects an unused line in the analog subscriber line group 6 to make an incoming call. The modem receiving the incoming call automatically answers the IS in the corresponding ISDN terminal adapter group 11.
The DN terminal adapter is in the command reception state.

Next, the data terminal 1 receives the ISD from the telephone number of the ISDN subscriber line 13 to which the data terminal 15 is connected.
Transmission is performed using the ISDN terminal adapter in the N terminal adapter group 11. ISDN that received the incoming call
The terminal adapter 14 responds to the data terminal 1 and the data terminal 15 in response to an automatic response or an instruction from the data terminal 15.
Enables data communication.

Next, a case where the data terminal 15 makes a call and communicates with the data terminal 1 will be described. The data terminal 15 uses the ISDN terminal adapter 14 to make a call to the representative number of the ISDN subscriber line group 12 to which the ISDN terminal adapter group 11 is connected. The ISDN exchange 5 selects an unused line in the ISDN subscriber line group 12 to make an incoming call. The ISDN terminal adapter that receives the incoming call automatically responds, and the modem in the corresponding modem group 7 enters the command accepting state.

Next, the data terminal 15 uses the modem in the modem group 7 to make a call to the telephone number of the analog subscriber line 3 to which the data terminal 1 is connected. The modem 2 receiving the incoming call responds by an automatic response or an instruction from the data terminal 1, and the data terminal 1 and the data terminal 15 can perform data communication.

Finally, the case where the data terminal 1 and the data terminal 15 disconnect from the state in which data communication is in progress will be described. When the data terminal 1 issues a call disconnection request between the modem 2 and the modems in the modem group 7 by the disconnection command to the modem 2, the ISDN exchange 5 disconnects the call by the disconnection request. As a result, the carrier wave detection terminals of the modems in the modem group 7 transit from the positive signal to the negative signal. This signal is differentiated by the corresponding differentiating circuit in the differentiating circuit group 9 to become a negative signal pulse having a constant width. The ISDN terminal adapter in the ISDN terminal adapter group 11 disconnects the call with the ISDN terminal adapter 14 by this negative signal, and after a certain period of time, returns to the positive signal to enable automatic response.

Also, the data terminal 15 sends an ISDN by issuing a disconnect command to the ISDN terminal adapter 14.
When a disconnection request for the call between the terminal adapter 14 and the ISDN terminal adapter in the ISDN terminal adapter group 11 is issued, the ISDN exchange 5 disconnects the call due to the disconnection request. This allows ISDN
The carrier detection terminal of the ISDN terminal adapter in the terminal adapter group 11 transits from the positive signal to the negative signal. This signal is differentiated by the corresponding differentiating circuit in the differentiating circuit group 10 to become a negative signal pulse having a constant width.
The modems in the modem group 7 receive the modem 2 by this negative signal.
The call can be automatically answered by disconnecting the call between and and returning to an affirmative signal after a certain period of time.

FIG. 2 is a block diagram for explaining the second embodiment of the present invention. The data terminal 1 is connected to the analog subscriber line 3 through the modem 2 and the public telephone network 4
It is connected to the ISDN exchange 17 via. The data terminal 15 is connected to the ISDN subscriber line 13 via the ISDN terminal adapter 14. Modem group 7
Each modem is connected to an analog subscriber line, and the analog subscriber line is accommodated in an ISDN exchange 17 to form an analog subscriber line group 6 and a representative service is set. ISDN terminal adapter group 1
Each terminal adapter of No. 1 is connected to an ISDN subscriber line, and the ISDN subscriber line is an ISDN subscriber line.
The ISDN subscriber line group 12 accommodated in the DN exchange 17 is formed and a representative service is set. Also, each data terminal (not shown) of the modem group 7 and the ISDN terminal adapter group 11 is connected by an interlaced wire 8. ISDN
The exchange 17 includes a disconnection control unit 16 that controls disconnection of the communication path of the data terminal.

First, the data terminal 1 makes a call and the data terminal 1
The case of communicating with the No. 5 will be described. The data terminal 1 uses the modem 2 to make a call to the representative number of the analog subscriber line group 6 to which the modem group 7 is connected. ISDN exchange 1
A line 7 selects an unused line in the analog subscriber line group 6 to receive a call. The modem that receives the call automatically answers,
I in the corresponding ISDN terminal adapter group 11
The SDN terminal adapter is ready to accept commands.

Next, the data terminal 1 sends the ISD to the telephone number of the ISDN subscriber line 13 to which the data terminal 15 is connected.
Transmission is performed using the ISDN terminal adapter in the N terminal adapter group 11. ISDN that received the incoming call
The terminal adapter 14 responds to the data terminal 1 and the data terminal 15 in response to an automatic response or an instruction from the data terminal 15.
Enables data communication.

Next, the case where the data terminal 15 makes a call and communicates with the data terminal 1 will be described. The data terminal 15 uses the ISDN terminal adapter 14 to make a call to the representative number of the ISDN subscriber line group 12 to which the ISDN terminal adapter group 11 is connected. The ISDN exchange 17 selects an unused line in the ISDN subscriber line group 12 and makes an incoming call. The ISDN terminal adapter that receives the incoming call automatically responds, and the modem in the corresponding modem group 7 enters the command accepting state.

Next, the data terminal 15 transmits to the telephone number of the analog subscriber line 3 to which the data terminal 1 is connected by using the modem in the modem group 7. The modem 2 receiving the incoming call responds by an automatic response or an instruction from the data terminal 1, and the data terminal 1 and the data terminal 15 can perform data communication.

Finally, the case where the data terminal 1 and the data terminal 15 disconnect from the state during data communication will be described. When the data terminal 1 disconnects the call between the modem 2 and the modem in the modem group 7 by the disconnect command to the modem 2, the disconnect control unit 16 of the ISDN exchange 17 disconnects the call and responds at the same time. The call between the ISDN terminal adapter 14 and the ISDN terminal adapter in the ISDN terminal adapter group 11 is disconnected. In addition, the data terminal 15 sends an ISDN terminal or IS14 by issuing a disconnect command to the adapter 14.
DN terminal adapter 14 and ISDN terminal
When the call with the ISDN terminal adapter in the adapter group 11 is disconnected, the disconnection control unit 16 of the ISDN exchange 17 disconnects the call according to the disconnection request, and at the same time, the corresponding modem 2 and the modem of the modem group 7 are disconnected. Disconnect the call between.

[0019]

As described above, the present invention is based on the ISDN.
The exchange, a modem for general analog lines, and general ISD
Either an ISDN terminal adapter for N lines and a differentiating circuit that generates a negative signal of a certain width by the transition of the positive signal to the negative signal are provided, or either the originating side or the terminating side terminal is replaced with this differentiating circuit. By providing a disconnection control unit that disconnects the communication path of the corresponding other terminal when the disconnection request of one terminal is received, it is possible to economically provide the modem sharing service without making a large change to the ISDN exchange. Have.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining a first embodiment of the present invention.

FIG. 2 is a configuration diagram for explaining a second embodiment of the present invention.

[Explanation of symbols]

 1,15 Data terminal 2 Modem 3 Analog subscriber line 4 Public telephone network 5,17 ISDN switch 6 Analog subscriber line group 7 Modem group 8 Entanglement line 9,10 Differentiation circuit group 11 ISDN terminal adapter group 12 ISDN subscriber line Group 13 ISDN subscriber line 14 ISDN terminal adapter 16 Disconnection control unit

Claims (2)

[Claims] 1. A plurality of modems connected to an analog subscriber line accommodated in an ISDN exchange and having a representative number service set, and an ISDN subscriber line accommodated in the ISDN exchange and having a representative number service set. A plurality of terminal adapters that are connected and correspond to the plurality of modems on a one-to-one basis, one is connected to the modem and the other is connected to the terminal adapter, and a negative signal of a certain width due to the fall of the carrier wave detection signal. A plurality of differentiating circuits for generating pulses are provided, and the data signals of the modem and the terminal adapter are connected to each other via a confounding line on the basis of a connection request from the terminal on the calling side, and a communication path between the terminals on the calling side and the called side When the communication path of either the originating side or the terminating side of the terminal is disconnected, the output of the differentiating circuit is output. A modem sharing system for an ISDN exchange, characterized in that the communication path of the corresponding other terminal is disconnected by a negative signal pulse. 2. A plurality of modems connected to an analog subscriber line accommodated in an ISDN exchange and having a representative number service set, and an ISDN subscriber line accommodated in the ISDN exchange and having a representative number service set. A plurality of terminal adapters that are connected and correspond to the plurality of modems on a one-to-one basis, and a disconnection control unit that controls the ISDN exchange to disconnect the communication path of the originating side or the terminating side terminal. Based on the connection request of the above, the data signals of the modem and the terminal adapter are connected to each other via an interlacing line to form a communication path of the terminals of the calling side and the called side, and disconnect the terminals of the calling side and the called side. When the disconnection request is received from any one of these terminals, the disconnection control unit disconnects the communication path of the corresponding other terminal. A method for sharing a modem of an ISDN exchange, which is characterized in that