JPH0654023A - Communication terminal adaptor - Google Patents

Abstract

PURPOSE:To avoid waste of a communication charge by automatically interrupting a busy line not making data transmission reception after a prescribed time. CONSTITUTION:An ISDN channel storage circuit 1 of an ISDN communication terminal equipment adaptor extracts a channel of an ISDN line in communication from a communication circuit 6 and stores it in the case of communication and a data monitor circuit 4 monitors the presence of communication data during he communication as to the channel. A timer circuit 3 counts the consecutive time in the case of absence of communication data and an interrupt processing control circuit 5 interrupts the communication when the count is equal to a content in a timer storage circuit 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal adapter device, and more particularly to a communication terminal adapter device connected to an integrated services digital network (ISDN).

[0002]

2. Description of the Related Art In a conventional communication terminal adapter device, when a connected non-ISDN terminal fails during communication and data cannot be transmitted / received, the communication path is manually disconnected from the adapter device of the communication terminal. I am letting you.

[0003]

In this conventional communication terminal adapter device, when the connected non-ISDN terminal fails during communication and data cannot be transmitted / received, the communication is manually performed from the adapter device in the town. In order to disconnect the communication channel, the communication channel cannot be disconnected when the adapter device of the communication terminal and the non-ISDN terminal connected thereto are operated unattended.

[0004]

SUMMARY OF THE INVENTION A communication terminal adapter device of the present invention is a communication terminal adapter device connected to a user network interface of ISDN (Integrated Services Digital Network), which is a digital system connected to its own terminal. A first storage circuit for storing the ISDN channel used by the ISDN terminal for communication, and monitoring the presence / absence of data of the non-ISDN terminal on the data line of the ISDN user network interface based on information from the first storage circuit. Monitoring circuit, a second storage circuit for storing a timer value for monitoring the duration of no data in the monitoring circuit, information from the monitoring circuit, and the information read from the first and second storage circuits. A timer circuit for counting a time without data according to information, timeout information from the timer circuit, and the first circuit The channel information read from the memory circuit and a control circuit for performing a process of disconnecting the ISDN line, when the communication is started, IS in the first memory circuit
The used channel information of the DN is stored, the monitoring circuit monitors the data line on the ISDN user network interface, the duration time without communication data is counted by the timer circuit, and the duration time without communication data is the second time. When the timer value stored in the memory circuit is reached, the communication path is automatically disconnected.

[0005]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.

The communication terminal adapter device connected to the user network interface of ISDN (Integrated Services Digital Network) of this embodiment is an ISDN channel used for communication by a digital non-ISDN terminal connected to its own terminal. ISDN channel storage circuit 1 for storing the data, a data monitoring circuit 4 for monitoring the presence / absence of data of a non-ISDN terminal on the data line of the user network interface from this storage circuit 1, and the duration of no data in the data monitoring circuit 4. A timer value storage circuit 2 for storing a timer value for monitoring
The timer circuit 3 that counts the time without data based on the information from the monitoring circuit 4 and the information read from the storage circuits 1 and 2, and the IS information based on the timeout information from the timer circuit 3 and the channel information read from the storage circuit 1.
A disconnection processing control circuit 5 for disconnecting the DN line 8 is provided, and when communication is started, channel information for ISDN use is stored in the memory circuit 1, and the data monitoring circuit 4 stores data lines on the ISDN user network interface. Is monitored and the duration without communication data is counted by the timer circuit 3, and when the duration without communication data reaches the timer value stored in the storage circuit 2, the communication path is automatically disconnected.

Next, the operation of this embodiment will be described. When making a call or receiving a call, the ISDN channel storage circuit 1 receives channel information used by the ISDN line 8 from the communication line 6 through the control and data bus 7 and stores it. When communication is in progress, the data monitoring circuit 4
Information on the used channel of the ISDN line 8 is read from the channel memory circuit 1, and a signal on the data line of the channel is read by the communication circuit 6 through the control and data bus 7. If the read signal indicates that there is no data, the data monitoring circuit 4 passes through the control and data bus 7 and the timer circuit 3
The timer start information is sent to the timer circuit 3, and when the presence of data is indicated, the timer cancel information is sent to the timer circuit 3 through the control and data bus 7.

When the timer circuit 3 receives the information for starting the timer, the timer value storage circuit 2 is sent through the control and data bus 7.
The timer value is read from and the timer is started. Further, the timer circuit 3 initializes the timer when it receives the information of the timer cancellation. When the counted value reaches the timer value read from the timer value storage circuit 2, the timer circuit 3 sends timeout information to the disconnection processing control circuit 5 through the control and data bus 7 to initialize the timer. When the disconnection processing control circuit 5 receives the time-out information, the disconnection information is sent to the communication circuit 6 through the control and data bus 7 in order to disconnect the communication of the ISDN line 8 and the terminal side line 9.

[0009]

As described above, the present invention stores the channel information of the user network interface during communication,
By monitoring the data line of that channel, counting with a timer for the time when there is no data on the data line, and disconnecting the communication due to timeout, the digital terminal connected during communication sends and receives data due to failure etc. Even if it becomes impossible, the communication can be automatically disconnected, which is effective in eliminating the waste of communication charges.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 ISDN channel storage circuit 2 timer storage circuit 3 timer circuit 4 data monitoring circuit 5 disconnection processing control circuit 6 communication circuit 7 control and data bus 8 ISDN line 9 terminal side line

Claims (1)

[Claims] 1. ISDN (Integrated Services Digital Network)
In the communication terminal adapter device connected to the user network interface, the first memory circuit for storing the ISDN channel used for communication by the digital non-ISDN terminal connected to the own terminal; A monitoring circuit for monitoring the presence / absence of data of the non-ISDN terminal on the data line of the ISDN user network interface based on information from the storage circuit, and a timer value for monitoring the duration of no data in the monitoring circuit. Second storage circuit, a timer circuit that counts a time without data based on the information from the monitoring circuit and the information read from the first and second storage circuits, and timeout information from the timer circuit and the first storage circuit. The communication circuit is provided with a control circuit for disconnecting the ISDN line according to the channel information read from the memory circuit At this time, the channel information of the ISDN is stored in the first memory circuit, the monitoring circuit monitors the data line on the ISDN user network interface, and the timer circuit counts the duration without communication data. A communication terminal adapter device, which automatically disconnects the communication path when the duration without communication data reaches the timer value stored in the second storage circuit.