JPH02222242A - Isdn subscriber's terminal adaptor - Google Patents

Abstract

PURPOSE:To attain the communication not through a trunk line in the communication between extensions by discriminating whether a communication opposite party is an extension or an external line in a terminal adaptor and connecting the adaptor to the extension directly in the case of the extension communication. CONSTITUTION:When a call comes from a communication terminal equipment 6, a CPU 2 discriminates whether the call is addressed to an external line or an extension depending on dial information of a caller terminal equipment and controls the terminal adaptor 1 so that the terminal interfaces 3 of relevant extensions are connected directly when the dial information designates the extension call. Then in the case of a call to an external line, the call is connected to an ISDN line interface 4 to output the input dial information to the ISDN line interface 4. Thus, in the case of communication between extensions, the relevant interfaces 3 are connected in the terminal adaptor 1 and the extensions are able to be communicated without using an office line 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement of a home terminal adapter used by connecting to an ISDN line.

(Conventional technology)
SDN; lntegrated 5ervlc
es digital network). This ISDN provides telephone, data, facsimile communication, and various communication processing services in one digital communication network.A communication system using this ISDN is configured, for example, as shown in Figure 4. .

That is, this system has an ISDN switch 14 to which a digital circuit switching network 11, a packet switching network 12, a common line signaling network 13, etc. In the user's home, this network termination device 8 is connected to the home bus 10, and the home bus 10 is connected to a telephone device, facsimile device, etc.
A communication terminal device 6 such as a voice mail device, a printing device, etc. is connected. Then, a plurality of communication channels are selectively used for each subscriber line 9 to perform desired communication between communication terminal devices. For example, for a basic interface with a transmission rate of 192 bits/second, two B channels of 84 bits/second and one D channel of 16 bits/second are time-division multiplexed, and these channels are used to transmit data. etc. will be transmitted.

A terminal adapter device called a terminal adapter (TA) is a terminal connected to the home bus IO in such a line. This TA uses the D channel protocol, which is a protocol for ISDN user/network interface, to convert existing communication terminal equipment that does not have a signal conversion function into an ISDN user/network interface protocol.
This is an adapter that enables connection to a DN line for use, and is equipped with multiple existing terminal interfaces, and connects one of these existing terminal interfaces to one of the ISDN lines.
By converting the channel signal and sending and receiving signals, the existing terminal connected to the existing terminal interface can be connected to IS.
This allows it to be connected to a DN line and used for communication.

With 15OH, up to 8 communication terminals can be connected to the in-home bus, and in addition to the subscriber telephone number for that line, these terminals can be called by adding a sub-address for each terminal set by the user. This allows the call to be received by the communication terminal specified by the subaddress.

However, the terminal adapter 1 described above does not have an extension exchange function between existing terminals connected to its built-in existing terminal interface, and has a problem in that extension calls cannot be made via TA.

(Problem to be solved by the invention) In ISDN, a maximum of 8 communication devices are installed in the in-home bus.
It is now possible to connect terminals, and by adding a sub-address for each terminal set by the user in addition to the subscriber telephone number for that line, the call will be received at the communication terminal specified by that sub-address. be able to. By connecting to the in-house bus via a terminal adapter, you can use it in addition to an ISDN communication terminal.
This allows existing communication terminals to be connected and used. However, the above-mentioned terminal adapter does not have an extension exchange function between existing terminals connected to its own built-in existing terminal interface. To do this, first make a call to the station via the subscriber's line, connect it again to your subscriber's line through the station's ISDN switch, and use another channel on your subscriber's line to call the target extension communication terminal. You have to call $IJ8. In this way, extension calls cannot be made without going through the line on the central office side, and even though the communication is between terminals on the extension line, it occupies two channels of the ISDN line and requires communication charges. There was a problem.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an ISDN home terminal adapter that allows connected existing terminals to make extension calls without using the central office line.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows. That is, in a home terminal adapter that has a terminal interface to which a communication terminal is connected and an ISDN line interface for connecting to an ISDN line, and controls signal transmission between the two in order to connect the communication terminal to the ISDN line. , a plurality of terminal interfaces connected to each of the plurality of communication terminals and dial information of the calling side communication terminal are received, and when this dial information is extension specified dial information, an existing terminal connected to the calling side communication terminal. connection control means that connects the interface to the connected terminal interface of the called communication terminal, and connects the existing terminal interface connected to the calling side communication terminal and the ISDN line interface when the dial information is an external line designation; and configure it.

(Function) In such a configuration, when this terminal adapter receives a call from a communication terminal, the connection control means determines whether the call is to an outside line or an extension by dialing the calling terminal. Judging from the information, if the dialing information specifies an extension, the terminal adapter directly connects the terminal interfaces of the corresponding extensions, and if the call is to an outside line, it connects to the ISDN line interface and uses the input dialing information. is output to the ISDN line interface. Therefore, in communication between extensions, compatible interfaces can be connected within the terminal adapter, so that extension calls can be made without using the office line.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of the present invention,
In the figure, 1 is a terminal adapter, 2 is a CPU (processor), 3 is an existing terminal interface, 4 is an ISDN line interface, 5 is a memory, 6 is an existing terminal, 7 is a printing device, 8 is a network termination device, and 9 is a digital device. This is a subscriber line.

The digital subscriber line 9 consists of two 84k bps B channels and one IBk bps D channel. The existing terminal interface 3 is connected to the CPU bus and is used to send and receive data to and from existing terminals.

This existing terminal interface 3 is, for example, the well-known USART (Univ
ersal 5 synchronus/Asynchronous
nous Receiver Transalter
In the case of a printer, the printer is configured with an integrated circuit element such as the well-known Plo (Bae Referral Input/Output Circuit).

ISDN line interface 4 is USART and ISDN
It consists of 5 ICs (S point interface; 5 points refer to service access points). This SIC has two parallel boats and a 64k bps serial boat! fI
In addition, it is a circuit element that transmits and receives D channel signals on a parallel boat, and transmits and receives a B channel signal on a serial boat.

When making a call to ISDN, the CPU 2 writes necessary data (telephone number, etc.) to the parallel port (D ch) of the SIC. When sending data from an existing terminal to the line, write the data to USART and write it to USAI? It is sent from T to the SIC serial boat. A speed conversion circuit may be inserted between USART and SIC.

The memory 5 is used as a data buffer for transmitting and receiving data, and the CPU 2 is responsible for controlling the entire system. Further, when a call is made from a terminal, the CPU 2 waits for dial input information from the terminal, and when it receives the dial input information, it temporarily stores it in the memory 5, and when the input is completed, it judges the input information. , determines whether the communication is to an extension line or an outside line, determines the interface to be connected, and connects. Here, it is predetermined that if the call is to an outside line, the call should be made using the "telephone number" or "telephone number" + "subaddress", and if the call is to an extension, the call should be made using "r*J + r subaddress". .

The CPU 2 determines whether it is an outside line or an extension line depending on whether the first digit is "*", and if it is determined to be an outside line, the I
It is sent to the subscriber line 9, which is the office line, via the SDN line interface 4, and if it is an extension, the sent sub-address is compared with the sub-address for each extension terminal that has been arbitrarily set and registered in the memory 5 in advance, and if there is a mismatch. If there is a match, the call is stopped, and if there is a match, the call is connected to the corresponding terminal.

Next, the operation of this device having the above configuration will be explained. When making a call from an existing terminal, you must operate the bush button dial on the terminal to make the call, but if the person you want to communicate with is an outside line, enter the phone number, and if the person you want to communicate with is an extension, press the "N" key. Press , then enter the other party's subaddress. The input number is temporarily stored in the memory 5 via the existing terminal interface 3.

The contents of the memory 5 are analyzed by the CPU 2, and from the input data, if the data is an outside line, it is sent to the ISDN line interface 4.
Then, if it is an f0 extension that is converted into a D channel signal by the SIC and sent from the terminal device 8 to the central office line 9, the C
PU2 sends an incoming call notification to the other party's terminal. If the incoming call is rejected, the CPU 2 notifies the originating terminal that the incoming call has been rejected, and cancels the outgoing call.

When the front terminal accepts an incoming call, it sends out a permission notification. The sent permission notice is stored in the memory 5, and sent to the originating terminal by the CPU 2, and the two terminals are connected.

Information sent from the connected terminal is stored in the memory 5 and sent to the other party by the CPU 2. When a call is made to the printing device 7, the CPU 2 checks the status of the printing device 7,
If it is in operation, it will cancel the call, and if it is not in operation, it will send a permission notification to the calling party.

Upon receiving the permission notification, the originating side transmits a print data signal, and the printing device 7 receives this and prints it.

FIG. 2 is a flowchart showing the above operation. First, in step STI, the existing terminal makes a call using the telephone number if it is an outside line, or the r*J+r subaddress if it is an extension. CPU2
determines whether it is an outside line or an extension line depending on whether the first digit is "*" (Sr1).

If it is determined to be an outside line, it is sent to the subscriber line 9 via the ISDN line interface 4.

If it is an extension, the sent subaddress is compared with the registered subaddress (Sr1).

If there is no match, the call is stopped, and if there is a match, the corresponding terminal is connected (Sr1).

FIG. 3 is a flowchart showing the printing operation. First of all,
In step 5T21, an extension call is made. The CPU 2 compares the sent subaddress with the registered subaddress (Sr22). If they do not match, the call is stopped. If there is a match, the information sent from the existing terminal is output to the printing device 7 to perform a printing operation (Sr2
4).

As explained above, this device is connected to the in-home bus of the ISDN line, and is connected to the existing terminal interface to which the communication terminal on the originating or receiving side is connected, and performs signal conversion between the ISDN line and the existing communication terminal. Terminal and ISD
In a home terminal adapter that has an ISDN line interface for connecting to the N line, and an interface between the two in order to connect an existing communication terminal to the ISDN line, it has a plurality of existing terminal interfaces for connecting to the existing communication terminal. , receives the dial information of the calling side communication terminal, and when this dial information is extension specified dial information, connects the existing terminal interface connected to the calling side communication terminal and the existing terminal interface connected to the called side communication terminal. However, when the dial information specifies an outside line, a connection control means is provided to connect the existing terminal interface to which the calling side communication terminal is connected and the ISDN line interface.

When this terminal adapter receives a call from an existing terminal, the connection control means determines whether the call is to an outside line or an extension from the dialing information of the calling terminal, and the dialing information is If the extension is specified, the terminal adapter directly connects the existing terminal interfaces of the corresponding extensions, and if the call is to an external line, it connects to the ISDN line interface and outputs the input dial information to the ISDN line interface. This is how it was done. Therefore, in communication between extensions, compatible interfaces can be connected within the terminal adapter, so that extension calls can be made without using the office line.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications within the scope without changing the gist thereof.

〔Effect of the invention〕

As detailed above, according to the present invention, it is determined within the terminal adapter whether the communication partners are internal lines or external lines,
If it is an extension, we configured it to connect directly to the corresponding extension, so
It is possible to provide an ISDN home terminal adapter that enables communication between extensions without going through a central office line.

[Brief explanation of the drawing]

FIG. 1 is a system block diagram showing an embodiment of the present invention;
2 and 3 are flowcharts showing the operation of this device. FIG. 4 is a diagram showing the configuration of the ISDN communication system. 1... Terminal adapter, 2... CPU (processor), 3... Existing terminal interface, 4...
ISDN line interface, 5... memory, 6...
- Communication terminal device, 7...Printing device, 9...Subscriber line (office line). Applicant's Representative Patent Attorney Takehiko Suzue

Claims (1)

[Claims] An in-home computer that has a terminal interface to which a communication terminal is connected and an ISDN line interface for connecting to an ISDN line, and controls signal transmission between the two in order to connect the communication terminal to the ISDN line. A terminal or an adapter receives dial information from multiple terminal interfaces connected to each of multiple communication terminals and a calling side communication terminal, and when this dial information is extension specified dial information, connects the calling side communication terminal. connect the existing terminal interface connected to the called communication terminal and the connected terminal interface of the called side communication terminal, and connect the existing terminal interface connected to the calling side communication terminal and the ISDN line interface when the dial information is an external line designation. An ISDN home terminal adapter, characterized in that it has a connection control means.