JPH089945Y2 - ISDN network communication adapter - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an adapter for data communication using an ISDN network, and in particular, it utilizes user-to-user information that can be transmitted at a call control stage of an ISDN network. Transfer data between terminals
The present invention relates to an ISDN network communication adapter.

[Prior Art] Conventionally, so-called personal computer communication is known in which data is transmitted and received between computer terminals such as personal computers.

This personal computer communication is a system in which a modulation / demodulation device, a so-called modem, is provided between a terminal and an analog telephone line network, and data transmitted / received between the terminals is modulated by the modem to exchange data.

In recent years, the digitization of telephone line networks has entered the stage of practical application, and so-called ISDN networks have been constructed.
Various devices for data communication using a network have begun to be put into practical use.

[Problems to be Solved by the Invention] In the above-mentioned conventional data communication using the analog telephone line network, it is necessary to close the communication line before exchanging the data, and the data transmission is performed by the data communication. The so-called
Since it is necessary to transmit an analog signal such as a DTMF signal as a medium, there are problems that the communication speed is slow and the communication cost is high.

In addition, the data communication device using the above ISDN network is an ISDN
Data is generally transmitted and received via the B channel of the network. According to this method, it is designed on the premise that the amount of data transmission is extremely large. The size of the portion (corresponding to the modem) is very large, and the communication cost is high because the B channel of the ISDN network is used as described above, which is unsuitable for transmitting / receiving data having a relatively small amount of information.

The present invention proposes to solve the above problems,
An object of the present invention is to obtain an adapter for data communication which can communicate at low cost when the information amount of data to be transmitted is small.

[Means for Solving the Problem] In an ISDN network, a call control message is exchanged between a terminal and a network via a D channel in a call setup stage, a call control stage, and the like, and this call control is performed. The message is also sent to the terminal of the communication partner, and so-called user-to-user information including a small amount of data exclusively exchanged between the terminals can be sent to the terminal of the communication partner together with the call control message. is there.

The present invention utilizes the above characteristics of the ISDN network, and in order to utilize the data transmission function of the information between users, the data sent from the terminal is incorporated into the information between users and is added to the D channel of the ISDN network together with the call control message. It is intended to provide an adapter having a control function for sending out and a control function for extracting data from user-to-user information sent together with a call control message through a D channel of an ISDN network and inputting the data into a terminal.

[Operation] A call control message (call setup message) for call setup is sent from the adapter attached to the calling terminal at the time of calling.
It is sent to the ISDN network via its D channel, and the user-to-user information incorporating the data from the terminal is sent to the called terminal together with this call setup message. The adapter attached to the called terminal extracts the data from the user-to-user information and makes a call control message (call message) for confirming that the call is made and a call without answering the call. When the call is terminated, a call control message (release completion message) sent together with the circuit release control is sent to the calling side, and the data from the called terminal is incorporated into the user-to-user information sent together with this calling message or the release completion message. Send to the calling terminal. The calling side adapter extracts the data from the inter-user information including the data from the called terminal and sends it to the terminal.

In this way, the data transfer between the terminals is performed without call setting (without setting the B channel) in the call setting control stage, so that the communication cost is extremely low and the analog telephone line network is used. Communication speed is much faster than data communication.

[Embodiment] FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a diagram showing a sequence of sending and receiving a call control message at a call control stage between a calling terminal, a called terminal and an ISDN network.

As shown in FIG. 1, an adapter ADP for ISDN network communication according to the embodiment of the present invention is provided between a terminal TM such as a personal computer and an ISDN network.

 Each part of the adapter ADP will be described.

1 is a central control unit (hereinafter referred to as CPU), which is usually 1
Chip microprocessor
The adapter, such as the control that incorporates the data from TM into the inter-user information that is sent to the ISDN network, the control that extracts the data from the inter-user information received from the ISDN network, the control that exchanges the call control message with the ISDN network, etc. Performs ADP control collectively.

Reference numeral 2 denotes an S / P conversion unit having a serial-parallel mutual conversion function of performing parallel-serial conversion of data (parallel data) from the terminal TM and serial-parallel conversion of data (serial data) from the ISDN network.

A buffer 3 has a matching function when data is transferred between the terminal TM and the adapter ADP (S / P converter 2). The S / P conversion section 2 and the buffer 3 constitute a so-called R interface section.

4 is an information transmission control unit, which is a procedure defined for communication with the ISDN network (a procedure defined in Layer 1 or Layer 2)
Create various information to be sent to the ISDN network according to
Receives information sent from the DN network.

A driver receiver 5 sends information from the information transmission control unit 4 to the ISDN network, or receives information from the ISDN network and sends it to the information transmission control unit 4. The information transmission control unit 4 and the driver receiver 5 constitute a so-called I interface unit.

A random access memory (RAM) 6 stores an area 601 for storing data from the terminal TM, an area 602 for storing data from the ISDN network, and data that needs to be temporarily stored for call control. It has area 603. The RAM 6 is provided to match the data rate of the terminal TM and the data rate of transmitting to the ISDN network.

A ROM 7 stores a control program for the CPU 1.

Reference numeral 8 denotes a man-machine section, which has means for visually displaying the outgoing or incoming call status, means for audibly displaying the incoming call, speed setting switch for setting the data speed of the adapter ADP to the data speed of the terminal TM, and the like. .

As shown in FIG. 2, a source terminal TM _A and a destination terminal TM _B are connected to the ISDN network, and the terminals TM _A , TM _B and I respectively.
The adapter ADP according to this embodiment is connected to the SDN network.

The operation will be described by taking as an example the control of sending inquiry data from the calling terminal TM _A to the called terminal TM _B and sending answer data to the called terminal TM _B to the calling terminal TM _A.

When the telephone number (callee ID) of the callee and the inquiry data are entered in the originating terminal TM _A , these data are entered in the adapter ADP, and in the adapter ADP, the S / P is sent via the buffer 3. After being converted into serial data by the conversion unit 2, the destination ID is the area 603 of the RAM 6 under the control of the CPU 1.
The above data is stored in the area 601 of the RAM 6, respectively.

Next, the CPU 1 assigns the destination ID from the area 603 of the RAM 6 and the area 6
The data is read from 01 to control the information transmission control unit 4 to create information to be sent to the ISDN network. In other words, a call control message (call setup message) for call setup determined by the information transmission control unit 4 and a format of the user-to-user information added to the call setup message include the callee ID and the data, respectively. A setting message and information between users are created and sent to the D channel of the ISDN network by the driver circuit of the driver receiver 5.

In the ISDN network, as shown in FIG. 2, when a call setting message is received from the calling terminal TM _A, a call control message (call setting acceptance message) for confirming the message is sent back to the calling terminal TM _A , and the call setting message is sent. Dress included in the message
The D channel is set between the calling terminal TM _A and the receiving terminal TM _B by the ID, and the above call setup message and the user-to-user information transmitted together with it are transferred to the receiving terminal TM _B.

The call setup message and user between information from the called terminal TM ISDN network at _B is input to the adapter ADP, the call setting message is detected by the information transmission control unit 4 via the receiver circuit of the driver receiver 5. CP this
U1 reads and controls reception, and extracts data for the inquiry from the inter-user information sent together with the call control message and stores it in area 602 of RAM6, and then stores it from area 602 of RAM6. reads out the data, converts the data (serial data) into parallel data by the S / P converter 2 is sent to the receiving terminal TM _B via the buffer 3.

Upon receiving the incoming terminal TM data queries as described above in _B, and it sends the data of answers to. With the adapter ADP attached to the called terminal TM _B , the calling terminal TM
_The inter-user information incorporating the above-mentioned answer data is created in the same manner as the control for incorporating the inquiry data into the inter-user information in the adapter ADP attached to _A.

When the CPU 1 controls the reception of the call setup message from the originating terminal TM _A, it creates a call control message (a paging message) for confirmation of reception under the control of the information transmission control unit 4 and sets it in the D channel of the ISDN network. The user-to-user information including the response data is sent to the ISDN network together with the call message.

Adapter ADP ISDN network which forwards the paging message and user information between the calling terminal TM _A, comes to the originating terminal TM _A
Then, in the same manner as the data reception control for the inquiry in the adapter ADP attached to the receiving terminal TM _B , the data for the reply is extracted from the user information and the transmitting terminal TM
Send to _A. It should be noted that the above-mentioned incoming terminal TM _B to outgoing terminal TM _A
Transmission control of the call message to is a control to send the call-back tone (so-called RBT sound) to the calling terminal TM _A.

Further, after the above control, performs channel release control without the adapter ADP the response control supplied with the receiving terminal TM _B. That is, the CPU 1 controls the information transmission control unit 4 to send a call control message (release completion message) indicating the completion of line release control to the ISDN network, and the ISDN network receives the line and sends the line to the originating terminal TM _A. A call control message (disconnection message) indicating disconnection is sent. At this time, the receiving terminal TM _B
It is also possible to transmit the user-to-user information to the ISDN network together with the release completion message sent from the side, and the user-to-user information sent at this stage is transmitted from the ISDN network to the originating terminal TM _A.
Forwarded to the side with the disconnect message. Therefore, the transmission of the data (the answer data) from the receiving terminal TM _B side to the transmitting terminal TM _A side can be performed during the line release control on the receiving terminal TM _B side.

After the adapter ADP belonging to the originating terminal TM _A receives the disconnection message, the adapter ADP performs line release control, and two more types of call control messages (release message and release completion message) with the ISDN network. Is exchanged, but this control is a normal control performed with the ISDN network.

[Effects of the Invention] As described above, the present invention is provided between a terminal and an ISDN network, and is provided between users who can transmit with a call control message in a call control hierarchy in the ISDN network. The present invention provides an adapter for transmitting and receiving data by using information. Since data is transmitted and received only through the D channel of the ISDN network, it is not necessary to set the B channel and communication cost is reduced. Extremely cheap, and extremely fast data communication is possible with a hardware configuration that is cheaper than when using an analog telephone line network. (If you try to obtain the equivalent communication speed with an analog telephone line network, it will be a huge and expensive modem. Is required.)

In addition, the adapter does not require any complicated structure for transmitting data to the B channel and can be constructed at a very low cost, and since the transmission capacity can usually secure 128 octets, it is suitable for simple data transmission. Is enough.

As described above, according to the present invention, an inexpensive adapter is used to provide a data communication unit at a low communication cost, and the effect is extremely large.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a diagram explaining a control sequence in an ISDN network. TM: Terminal, ADP: Adapter, 1 ... CPU, 2 ... S / P
Conversion unit, 4 ... Information transmission control unit.

Claims (1)

[Scope of utility model registration request] 1. An adapter provided between a terminal and an ISDN network, which incorporates data sent from the terminal into user-to-user information and sends it to a D channel of the ISDN network together with a call control message. A control function for extracting data from the inter-user information sent together with the call control message through the D channel of the ISDN network and inputting it to the terminal, and when the adapter is the receiver of the call setup message, the call setup An ISDN network communication adapter that has the function of performing line release control without performing response control after confirming message reception.