JPH0879332A - Digital data transmitter - Google Patents

Abstract

PURPOSE: To allow a transmitter not to take a communication speed or the like of an equipment of an opposite party into account. CONSTITUTION: A digital data transmitter 20 is provided with an analysis section 21, a re-dial control section 22, and a reception control section 23. The analysis section 21 analyzes a content of an interrupt reason message from a digital network 30 at dialing and analyzes opposite party information from the digital network 30 at the reception. The re-dial control section 22 makes redialing by using a revised communication speed when communication connection with the opposite party is disable and uses a modem section 22a for the redialing when the equipment of the opposite party is an analog data transmitter 60. The reception control section 23 makes communication connection matching the communication speed of the equipment of the opposite party based on the analysis result of the analysis section 21 at the reception of a call and uses a modem section 23a for the communication connection when the equipment of the opposite party is the analog data transmitter 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital data transmission device for connecting a data terminal to a digital network.

[0002]

2. Description of the Related Art ISDN (Integrated Services Digital Network)
There is a terminal adapter as a digital data transmission device for connecting a data terminal such as a personal computer to a digital network such as. Such a terminal adapter has a function of converting, for example, a V series interface data terminal into an I interface of a digital network.

[0003]

By the way, in the digital network, if the communication speeds of the originating side and the terminating side are different, communication connection cannot be established. Therefore, in the digital data transmission device, the communication speed of the originating side digital data transmission device is A communication connection request must be made to the digital network in a state where the communication speed of the partner device matches. For this reason,
Conventionally, when making a communication connection, it is necessary to always know the communication speed of the other party, which is very troublesome in using the digital data transmission device.

When the data terminal on the other end is connected to the analog network, the originating side needs to perform the modulation process using the modem before the originating operation. In this case as well, It was necessary to know in advance whether the data terminal on the side was connected to the analog network.

From the above points, it is desired to realize a digital data transmission apparatus which can be connected to the digital network without considering the communication speed of the other party's digital data transmission apparatus or the connected communication network. It was

[0006]

In order to solve the above-mentioned problem that the communication speed of the other party must be known in advance, the digital data transmission apparatus of the present invention performs the transmission processing requested by the data terminal. If you do, perform communication connection processing to the digital network at a predetermined communication speed,
As a result, when a communication connection cannot be established with the data terminal of the other party, the re-transmission control unit that changes the communication speed and performs the communication connection process again is provided.

Further, in the case of performing the incoming call processing from the digital network, the analysis unit that determines the communication speed of the transmission side based on the communication speed information transmitted from the digital network, and the transmission side device that is determined by this analysis unit When the communication speed is different from the preset communication speed, the reception control unit performs the communication connection processing by matching the communication speed of the transmission side device determined by the analysis unit.

Further, the digital data transmission apparatus of the present invention is required by the data terminal in order to solve the above-mentioned problem that it is necessary to know in advance whether or not the partner apparatus is connected to the analog network. In the case of performing the outgoing call processing, first, a request for communication connection to a predetermined digital network is made. As a result, if the communication connection cannot be established, data modulation processing for the analog network is performed and the digital network is re-established. A re-transmission control unit for making a communication connection request is provided.

Further, in the case of performing the incoming call processing from the digital network, the analysis unit for determining whether or not the data transmission device on the transmission side is an analog data transmission device, and the transmission side device determined by this analysis unit is the analog data transmission device. In the case of a transmission device, it is provided with a reception control unit that performs data demodulation processing for an analog network and performs communication connection processing.

[0010]

In the digital data transmission apparatus of the present invention, when transmitting processing to a digital network, first,
Communication connection processing is performed at a predetermined communication speed. As a result, if you cannot connect to the data terminal of the other party,
The re-originating control unit changes the communication speed and performs the communication connection process again.

Further, in the digital data transmission apparatus of the present invention, when the incoming call processing from the digital network is performed,
The analysis unit determines the communication speed of the transmission side from the communication speed information sent from the digital network. Then, when the communication speed of the transmission side device determined by the analysis unit is different from the preset communication speed, the reception control unit matches the communication speed of the transmission side device determined by the analysis unit and performs communication connection processing. To do.

Further, in the digital data transmission apparatus of the present invention, when performing the calling process requested by the data terminal, first, a request for communication connection to a predetermined digital network is made. Then, as a result, if the communication connection cannot be established, the re-transmission control unit performs data modulation processing for the analog network, and again requests communication connection to the digital network.

Further, in the digital data transmission apparatus of the present invention, when the incoming call processing from the digital network is performed,
The analysis unit determines whether or not the data transmission device on the transmission side is an analog data transmission device. Then, when the transmission side device determined by the analysis unit is an analog data transmission device, the reception control unit performs data demodulation processing for an analog network and performs communication connection processing.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a communication system including a digital data transmission device of the present invention. The system shown in the figure includes a data terminal 10, a digital data transmission device 20, a digital network 30, an analog network 40, a partner digital data transmission device 50, an analog data transmission device 60, and partner data terminals 70 and 80.

The data terminal 10 and the counterpart data terminals 70, 80 are each composed of a personal computer or the like, and have a VIT interface recommended by CCITT. Each of them is a serial interface such as RS-232C, and each data transmission device. It is connected to 20, 50 and 60.

The digital data transmission device 20 is a CCI.
TT Recommendation V. The terminal adapter 110 has a speed matching function and a modem function, and has an analysis unit 21, a re-transmission control unit 22, and a reception control unit 23. The analysis unit 21
In the transmission operation, when the disconnection message is received from the digital network 30, it has a function of analyzing the disconnection reason, and in the reception operation, it has a function of analyzing the information element of the calling message from the partner side. ing.

The re-transmission control unit 22 determines whether the analysis result of the analysis unit 21 does not match the terminal attributes during the transmission operation.
When the communication speed is changed and the communication connection process is performed again, and the analysis result indicates that there is no other party's route, the modem unit 22
A has a function of performing a modulation operation for an analog network and performing communication connection processing again.

Further, the reception control unit 23, when the receiving operation is performed and the analysis result of the partner data transmission device in the analysis unit 21 is the analog data transmission device 60, the modem unit 23.
When the analysis result is the digital data transmission device 50 and the communication speeds do not match, the communication speed of the other side is determined based on the information element. It is equipped with a function to perform connection processing by selecting the combined communication speed.

The digital network 30 is a digital network such as ISDN, which connects digital data transmission devices to each other and accommodates the analog network 40.
It is also configured to be connectable to an analog data transmission device connected to 0. Further, the digital network 30 has a function of returning the reason for disconnection to the calling side when the connection cannot be established as a result of the communication connection to the partner device.

Digital data transmission device 50 on the other side
Is V. 110 is a terminal adapter having a 110 communication speed conversion system, or a digital data transmission device having the same configuration as the present digital data transmission device 20. The analog data transmission device 60 is a modem (modulator / demodulator) for transmitting / receiving the digital data of the data terminal 80 to / from the analog network 40.

Next, a data communication operation including the digital data transmission device 20 configured as described above will be described. First, the case of a communication connection request from the data terminal 10 to the data terminal 70 will be described.

FIG. 2 is a flow chart when transmitting from the digital data transmission device 20. Upon receiving the communication connection request from the data terminal 10, the digital data transmission device 20 creates a call (SET UP) message by the function of the communication control unit (not shown) (step S
1) The call is sent to the digital network 30 (step S2).
In the digital data transmission device 20, first, the communication speed is set in advance to the maximum speed {= 38.4 Kbps (asynchronous 19.2 Kbps in CCITT recommendation)} and is set in advance.

As a result, the digital network 30 performs a predetermined communication connection operation with the digital data transmission device 50, and returns the result to the digital data transmission device 20 side. For example, if the communication speed set by the data terminal 70 on the partner side is other than 38.4 Kbps, connection is not established, and in such a case, the digital network 30 sends a disconnection message to the sender side.

When the digital data transmission device 20 receives the message indicating the communication connection result from the digital network 30, the analysis unit 21 determines the message type from the digital network 30 (step S3). In step S3, if the message from the digital network 30 is the response message, the connection process to the data terminal 70 on the partner side is performed (step S4). That is, in this case, it is a normal communication connection process.

On the other hand, in step S3, when the message from the digital network 30 is the disconnection / release message, the analysis unit 21 analyzes the disconnection reason (step S5). In step S5, if the reason for disconnection is a mismatch in the terminal attributes, the redialing control unit 22 changes the communication speed and performs redialing processing, and the process returns to step S3. That is, the information element of the outgoing call (SET UP) message is rewritten and the outgoing call process is performed again (step S
7). In this case, the communication speed is 19.2 Kbps, which is one step lower. In this case, since there is a communication speed that has not been executed, "NO" is obtained in the step S6, and the process proceeds to the redialing process of the step S7.

As a result of the re-transmission in step S7, step S
If the message type from the network in 3 is the response message, the connection process of step S4 is performed. Also,
If the message type is disconnect or release message,
The analysis unit 21 determines the disconnection reason again. As a result, if the terminal attributes do not match, it is determined in step S6 whether or not the transmission has been performed at all communication speeds, and in this case, there are still communication speeds that have not been executed.
Proceed to step S7. Then, in step S7, re-transmission processing is performed at 9600 bps, which is one step lower than the previous speed, and the process returns to step S3.

In step S3, if the message from the network is a disconnection / release message and the reason for disconnection is the disagreement of the terminal attributes, the re-originating process has been performed at all communication speeds, and so the process in step S6 The result is "YE
S ”, and the digital data transmission device 20 performs the re-originating process using the modem unit 22a (step S
9). It is to be noted that such a transmission process using the modem unit 22a is necessary when, for example, the data terminal 70 is connected to the digital data transmission device 50 via a modem. The operation after the redialing process will be described later. If the reason for disconnection in step S5 is busy in the partner data terminal 70 in any of the calling processes, the disconnection process is performed as it is (step S8).

As described above, in the present digital data transmission device 20, even if the communication speed of the partner device or the presence / absence of connection of the modem is unknown, the sender side does not pay attention to this.
All you have to do is make a call request.

Next, a case where a communication connection request is made to the data terminal 80 connected to the analog network 40 will be described. In this case, the processing of steps S1 to S3 is similar to the above case. That is, V. The call is sent using the 110 speed conversion method.

When the partner data terminal 80 is connected to the analog network 40, the digital network 30 returns "no partner route" as the disconnect message. Therefore, the reason for disconnection of the analysis unit 21 in step S5 is “no partner route”, and in this case, the re-transmission control unit 22 operates the modem unit 22a in the same manner as in the case of transmitting at all speeds in step S6. After performing the used modulation operation, a re-transmission process is performed (step S9). As a result, in the next step S10, the digital network 30
If the message type from 1 is a response message, connection processing is performed (step S11). On the other hand, disconnection,
If it is a release message, that is, if the reason is other than the processing of the analog network 40, the disconnection processing is performed (step S12).

As described above, in the present digital data transmission device 20, even if the partner device is a data transmission device connected to the analog network 40, the originator side does not need to be aware of this and only makes the origination request. I'm done.

Next, the case of an incoming operation to the digital data transmission device 20 will be described. FIG. 3 is a flowchart of the incoming call operation. When a communication control unit (not shown) of the digital data transmission device 20 performs a process of receiving a call (SET UP) message from the digital network 30 (step S1), the analysis unit 21 analyzes the information element of the call message. Is performed (step S2).

By the analysis processing of this step S2, the data transmission device of the other party is judged (step S3), and when the data transmission device of the other party is the analog data transmission device 60, that is, the data terminal 80 is the analog network. When the communication connection request is made via 40, the reception control unit 23 performs the connection process and the demodulation process by the modem unit 23a (step S4).

On the other hand, if it is determined in step S3 that the partner data transmission device is the digital data transmission device 50, that is, if the data terminal 70 has made a communication connection request to the digital network 30, reception is performed. Control unit 23
Determines the communication speed of the partner digital data transmission device 50 from the information element (step S5).

In step S5, if the communication speed of the partner digital data transmission device 50 matches the preset communication speed of the digital data transmission device 20, the connection process is performed as it is (step S5).
6) If the communication speeds do not match, the communication speed of the digital data transmission device 20 is adjusted to that of the partner digital data transmission device 50 (step S7), and the connection process of step S6 is performed.

As described above, in the present digital data transmission device 20, it is not necessary to consider the communication speed of the partner device and the device connected to the analog network 40 even in the incoming operation.

[0037]

As described above, according to the digital data transmission apparatus of the present invention, when the transmission processing is performed, first, the communication connection processing is performed at the predetermined communication speed, and as a result, the communication connection can be performed. If it does not exist, the communication speed is changed and the communication connection processing is performed again. Therefore, even if the communication speed of the other party's device is unknown, the caller does not need to be aware of this and only makes a call request. I'm done.

Further, according to the digital data transmission apparatus of the present invention, when the incoming call processing is performed, the communication connection is made to match the communication speed of the other party based on the speed information from the digital network. Even when receiving a call, it is not necessary to consider the communication speed of the partner device.

Further, according to the digital data transmission apparatus of the present invention, when performing a calling process, first, a communication connection request is made to a predetermined digital network, and if a communication connection cannot be made as a result, an analog signal is sent. Since the data modulation processing for the network is performed and the communication connection request is made again to the digital network, it is not necessary to pay attention to whether or not the partner device is connected to the analog network.

Further, according to the digital data transmission apparatus of the present invention, when performing the incoming call processing, it is judged whether or not the data transmission apparatus on the calling side is the analog data transmission apparatus, and if it is the analog data transmission apparatus. Since the data connection demodulation process for the analog network is performed to perform the communication connection process, it is not necessary to pay attention to whether the partner device is connected to the analog network at the time of incoming call.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a communication system including a digital data transmission device of the present invention.

FIG. 2 is a flowchart of a transmission operation of the digital data transmission device of the present invention.

FIG. 3 is a flowchart of an incoming operation of the digital data transmission device of the present invention.

[Explanation of symbols]

 10 data terminal 20 digital data transmission device 30 digital network 40 analog network 50 partner's digital data transmission device 60 analog data transmission device 70, 80 partner's data terminal

Claims (4)

[Claims] 1. In a digital data transmission device for connecting a data terminal to a digital network, when performing a calling process requested by the data terminal, a communication connection process to the digital network is performed at a predetermined communication speed. As a result, if a communication connection cannot be established with the data terminal on the other side, the digital data transmission device is provided with a re-originating control unit that changes the communication speed and performs communication connection processing again. 2. In a digital data transmission device for communicatively connecting a data terminal and a digital network having a function of transmitting the communication speed information of the calling side to the called side, when the incoming call processing from the digital network is performed, When the communication speed of the analysis unit that determines the communication speed of the transmission side based on the information of the communication speed sent from the digital network and the transmission side device determined by the analysis unit is different from the preset communication speed, A digital data transmission device, comprising: a reception control unit that performs a communication connection process in accordance with the communication speed of the transmission side device determined by the analysis unit. 3. When the data terminal on the other end is directly connected to the digital network, a request for communication connection to the digital network determined in advance is made, and the data terminal on the other end is transferred from the digital network to the analog network. In the case of performing a transmission process requested from a data terminal in a digital data transmission device that performs a data modulation process for the analog network and makes a communication connection request to the digital network, first,
If a communication connection request to the predetermined digital network is made and, as a result, communication connection cannot be established, data modulation processing for the analog network is performed, and a communication connection request is made again to the digital network. A digital data transmission device comprising a control unit. 4. When the data transmission device on the transmission side is an analog data transmission device connected to an analog network, the digital network having a function of transmitting the information to the reception side communicates with the data terminal on the reception side. In the digital data transmission device to be connected, when performing incoming call processing from the digital network, an analysis unit that determines whether or not the data transmission device on the transmission side is an analog data transmission device, and the transmission determined by the analysis unit. A digital data transmission device comprising: a reception control unit that performs a data demodulation process for an analog network and performs a communication connection process when the side device is an analog data transmission device.