JPH05145660A - Terminal adaptor for isdn - Google Patents

Abstract

PURPOSE:To provide the terminal adaptor for ISDN able to attain automatic dialing/automatic reception without notifying it by a terminal equipment as to whether a communicating other party is a terminal equipment connected to an ISDN network or a terminal equipment connected to an analog public network. CONSTITUTION:The terminal adaptor 20 consists of a DTE interface section 22, a digital communication processing section 24, an analog MODEM section 26, a CODEC 28, an ISDN circuit interface section 30, an information analysis section 32 and switches 34, 36. The information analysis section 32 applies changeover control of the logic switches 34, 36 based on information inputted from the section 22 or the ISDN line interface section to set an internal data path in response to the communication other party.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal adapter device, more specifically, ISDN (Integrated Services Dig).
Ital Network) A terminal adapter device connected to a line.

[0002]

2. Description of the Related Art In recent years, an ISDN network capable of high-speed data transmission has attracted attention as a digital communication network, and the number of its subscribers is increasing year by year. In many cases, ISDN network subscribers subscribe for the purpose of high-speed data transmission and additional services, rather than exchanging voice signals.

However, an ordinary data terminal (DT
E) is often an ISDN non-standard terminal that is not designed to be directly connected to the ISDN network. Therefore, such a terminal is connected to the ISDN line through a terminal adapter device (TA) that performs protocol conversion so that the terminal can be connected to points S and T of the ISDN user / network interface.

On the other hand, through the terminal adapter device, I
The data terminal connected to the SDN line also communicates with the data terminals connected to the ISDN network, and actually communicates with the packet terminal connected to the packet switching network and the data terminal connected to the analog public network. Often the need for data communication arises.

Therefore, the data terminal connected to the ISDN line can perform high-speed data communication with the terminal accommodated in the ISDN line and also can perform the data communication with the terminal connected to the packet network or the terminal connected to the analog network. It is desirable to be able to do it. When communicating with a terminal connected to the analog public network via a modem for modulating / demodulating, a modem is also required on the terminal side similarly connected to the ISDN line.

FIG. 2 shows an ISDN non-standard terminal 6 as an example of using such a terminal adapter in the prior art.
0 is a block diagram when 0 is connected to an ISDN line by using a conventional ISDN terminal adapter device. In the figure, a modem 62 is arranged so that data communication can be performed with a terminal connected to the analog public network.

That is, in the prior art shown in FIG. 2A, a terminal adapter 70 having a DTE (Data Terminal Equipment) interface, a terminal adapter 72 having a two-wire analog telephone interface, and a modem 62 are used. The modem 62 and the terminal adapter 70 are connected to the terminal (DT) via the switch 76.
E) connected to 60. Further, in the prior art shown in FIG. 1B, a terminal adapter 74 having both a DTE interface and a two-wire analog telephone interface and a modem 62 are provided, and these are connected to the switch 7
It is connected to the terminal 60 via 6.

In these conventional techniques, the switch 76 is set to the A side (solid line side) when communicating with a terminal connected to the ISDN network and when communicating with a terminal accommodated in the packet switching network via the ISDN network. , And a terminal adapter having a DTE interface (DTE port in the case of FIG. 1B) is used. Further, when communicating with a terminal of the analog public network, the switch 76 is switched to the B side (dotted line side), and the terminal adapter having a two-wire analog telephone interface (in the case of FIG. 1 (b), the two-wire analog Data communication is performed by using the port) and the modem 62.

[0009]

However, in the above-mentioned configuration of the prior art, the operator had to perform the switching operation of the switch 76 in advance according to the communication partner. That is,
For example, when the communication partner is a data terminal connected to an analog public network for performing data communication by a modem, the switch 76 must be switched to the B side. For this reason, when making an automatic call, the switch 76 is switched before the call operation is performed, and when making an automatic call, the switch 76 must be switched by receiving a contact from the callee beforehand. It was not possible to receive an automatic call.

In order to eliminate such a problem, for example, a terminal having two communication ports is prepared, one of the communication ports is connected to the A side and the other is connected to the B side, and the communication partner is the terminal side. A method of discriminating and controlling the switching of these ports can be considered. However, in this case, there is a problem that the communication terminal is limited to a terminal having two communication ports and the software for determining the communication partner must be incorporated in the communication software. Therefore, there is a problem that existing devices and software cannot be applied as they are.

The present invention solves the above-mentioned drawbacks of the prior art, and makes an automatic call origination / automatic call reception without the terminal side being aware of whether the communication partner is a terminal connected to the ISDN network or a terminal connected to the analog public network. An object is to provide a terminal adapter device for ISDN that can be used.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention uses an ISDN non-standard terminal as an ISDN user interface.
The terminal adapter device connected to the network interface is connected to the ISDN non-standard terminal, is connected to the terminal interface means for interfacing with the ISDN and the terminal interface means via the first switch means, and is connected to the digital network. Digital communication processing means for performing communication processing with the data terminal, and analog communication processing means for performing communication processing with the data terminal connected to the terminal interface means via the first switch means and connected to the analog network. An IS that is connected to either the digital communication processing means or the analog communication processing means via the second switch means and interfaces with the ISDN line.
It has a DN line interface means and an information analysis means for controlling the switching of the first switch means and the second switch means based on the information obtained from the ISDN network in the connection process with the ISDN line.

[0013]

According to the present invention, when the information obtained from the ISDN network in the connection process with the ISDN line indicates that the information is a data terminal connected to the analog line using the modem, the information analyzing means is provided. Switches the first switch and the second switch to the analog communication processing means side. Further, when the information obtained from the ISDN network indicates that it is a data terminal connected to a digital line, the information analysis means sets the first switch and the second switch to the digital communication processing means side. Switch.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the N terminal adapter device will be described in detail.

Referring to FIG. 1, an ISDN according to the present invention.
The functional block diagram which shows the Example of the terminal adapter device for is shown. The ISDN terminal adapter device 20 in this embodiment has one end connected to the ISDN non-standard terminal (DTE) 10 having a data communication function by the DTE interface 100, and the other end ISD.
It is connected to the subscriber terminating device (DSU) 40 via the S point or T point 110 which is the N interface reference point.

As shown in FIG. 1, the terminal adapter device 20 includes a DTE interface section 22, a digital communication processing section 24, an analog modulation / demodulation section 26, and a codec 2.
8, ISDN line interface unit 30, information analysis unit 3
2 and logic switches 34 and 36.

The DTE interface unit 22 is an interface unit which is connected to the ISDN non-standard terminal 10 via the DTE interface and has an interface matching therewith. The interface unit 22 includes a logical switch 34.
Is connected to the digital communication processing unit 34 or the analog modulation unit 26 via. The DTE interface unit 22 is also connected to the information analysis unit 32, and at the time of calling, the data terminal 1
When the destination information from 0 (a terminal connected to an analog line or a terminal connected to a digital line) is input, this is notified to the analysis unit 32.

The digital communication processing unit 24 is a processing unit for performing communication processing with a data terminal connected to an ISDN line or a data terminal connected to a packet switching network. The digital communication processing unit 24 is connected to the ISDN line interface unit 30 via a logical switch 36.

The analog modulation / demodulation unit 26 is a modulation / demodulation unit that modulates a signal from the data terminal 10 or demodulates a signal to be sent to the data terminal 10 when communicating with a data terminal connected to an analog public line. Further, the analog modulation / demodulation unit may be provided with the error correction and data compression functions used in the modem. Analog modulator / demodulator 2
6 is connected to the codec 28.

The codec 28 is connected to the ISDN line interface section 30 via a logical switch 36. The codec 28 converts the analog signal received from the analog modulation / demodulation unit 26 into a digital signal and sends it to the ISDN line interface unit 30, and converts the digital signal received from the interface unit 30 into an analog signal and sends it to the modulation / demodulation unit 26.

The ISDN line interface section 30 is a circuit for interfacing with the subscriber terminating device 40.
The ISDN line interface unit 30 is also connected to the information analysis unit 32 and notifies the information analysis unit 32 of information on communication services obtained from the ISDN network, information of the partner terminal, etc. at the time of incoming or outgoing.

The information analysis unit 32 is a control unit that controls the switching of the logical switches 34 and 36 based on the information input from the DTE interface unit 22 or the ISDN line interface unit 30 and sets the internal data path.

When receiving a call, the ISDN line interface section 3
When 0 receives the information of the communication service obtained from the ISDN network from the subscriber terminating device 40, the information of the partner terminal, etc., 0 notifies the information analysis unit 32 of these information. Upon receiving these pieces of information, the information analysis unit 32 determines whether the data terminal connected to the digital line is calling from the information of the partner terminal,
Alternatively, it is determined whether the call is from a data terminal connected to the analog line. Then, the information analysis unit 32 switches the logical switch to the A side (solid line side) in the case of the call from the data terminal connected to the digital line, and in the case of the call from the data terminal connected to the analog line. Switches the logic switch to the B side (dotted line side).

At the time of transmission, if the information for the communication partner is not known in advance, the information analysis unit 32 switches the logical switches 34 and 36 to the side with high frequency of use and transmits, and the information is obtained from the ISDN network in the process of line connection. Communication service information, partner terminal information, etc. are input through the ISDN line interface unit 30, and judgment is made based on these information to reconnect the logical switches 34 and 36 to appropriate sides to enter the communication state.

When the information on the communication partner is known in advance, the information on the communication partner is sent to the information analysis unit 32 through the DTE interface unit 22 prior to transmission. As a result, the information analysis section 32 selects and controls the logical switches 34 and 36 before transmitting. Even in this case, the information obtained from the ISDN network during the line connection process is judged by the information analysis unit 32 through the ISDN line interface unit 30, and the logical switches 34 and 36 are used.
If the setting is incorrect, make the correct settings and then enter the communication state.

[0026]

As described in detail above, according to the present invention, a modem and a codec necessary for communicating with a data terminal accommodated in an analog network are connected in series,
The function to set the internal data path to these is provided by the information obtained from the ISDN network. For this reason, data communication is possible with a data terminal that uses a modem connected to the analog public network via the ISDN network, and automatic transmission is performed regardless of whether the communication partner is an ISDN network terminal or an analog public network terminal. / You can receive an automatic call.

According to the present invention, the I
Since the selection control of the internal data path can be performed from the information obtained from the SDN network, it is possible to use the terminal and the communication software used for the conventional communication by the modem without any special conditions on the terminal side.

Further, according to the present invention, the NCU control unit, the two-wire type analog telephone interface unit, and the ringing signal generator, which are required as the components when the conventional terminal adapter is used, are unnecessary. Also, since it is possible to remove one of the DTE interface units, it is possible to substantially reduce the number of parts of the device, and it is possible to provide an inexpensive communication system.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an embodiment of a terminal adapter device for ISDN according to the present invention,

FIG. 2 is a connection diagram showing an example of use of a terminal adapter device for ISDN in the prior art,

FIG. 3 is a functional block diagram showing a configuration of a terminal adapter device for ISDN according to a conventional technique.

[Explanation of symbols]

 10 ISDN non-standard terminal 20 Terminal adapter device 22 DTE interface unit 24 Digital communication processing unit 26 Analog modulation / demodulation unit 28 Codec 30 ISDN line interface unit 32 Information analysis unit 40 Subscriber termination device

Claims (1)

[Claims] 1. An ISDN non-standard terminal is connected to an ISDN user.
A terminal adapter device connected to a network interface, which is connected to the ISDN non-standard terminal, and which is connected to the terminal interface means via the first switch means, and is connected to the digital network. Digital communication processing means for performing communication processing with the data terminal, and analog communication for performing communication processing with the data terminal connected to the terminal interface means via the first switch means and connected to the analog network. Processing means and an ISDN line interface means connected to either the digital communication processing means or the analog communication processing means via the second switch means to interface with the ISDN line, and the ISDN line. Information obtained from the ISDN network during the connection process of Hazuki, terminal adapter apparatus characterized by and an information analyzing means for performing switching control of said first switch means and second switch means.