JPH0248844A - Data terminal equipment - Google Patents

Abstract

PURPOSE:To attain the transmission reception even with any terminal equipment by providing a table storing whether a communication opposite party is a terminal equipment applying packet exchange communication or a terminal equipment applying modulation system communication so as to select transmission reception. CONSTITUTION:A table provided to a controller 110 is retrieved by a destination telephone number at data transmission so as to whether a destination data terminal equipment is an ISDN terminal equipment or not. In the case of the ISDN terminal equipment, switches 112, 116 are switched to the position of a packet exchange 113 and in the case of non-ISDN terminal equipment, the switches are thrown to the position of MODEM 114-CODEC 11115. On the other hand, the table is retrieved by a sender telephone number at the data reception and when the number is registered, the switches 116, 112 are thrown to the position of the exchange 113 to given the reception data to the exchange 113. When the sender telephone number is not stored in the received signal, since the analog signal is sent while being encoded, the switches 116, 112 are thrown to the position of the CODEC115-MODEM114.

Description

DETAILED DESCRIPTION OF THE INVENTION (Al Industrial Application Field) This invention relates to a data terminal device connected to an ISDN network.

(blConventional technologyCurrent TSD N (Integrated 5er)
vices Digital Network) k1
4 is being put into practical use. A data terminal device that can be directly connected to this ISDN network encodes data in its digital state based on ISDN layer 1 specifications and sends it to the ISDN network, and also receives the data sent in this way. It has a function. This method enables high-speed transmission of approximately 64 Kbps.

On the other hand, data terminal equipment that performs data communication over conventional analog communication networks (such as public telephone lines) frequency-modulates or phase-modulates a carrier wave using a data signal and sends it out to the line. It has a data transmission and reception function for the modulation method to be received. In this method, 120
Low-speed transmission of about 0 bps is performed. This data terminal equipment cannot be used on the ISDN network as it is, so
ISDN adapters for adapting to DN networks have also been put into practical use. The method for adapting conventional data terminal equipment to ISDN specifications is to quantize the analog signal of the modulation method, convert it to digital data, send it to ISDN'li4, receive the data sent in this way, and re-transmit it. An analog compatible method that converts data into analog data, and a digital compatible method that directly inputs and outputs digital data from a data terminal device and sends and receives it at high speed have been put into practical use. The analog compatible method performs low-speed transmission of 1200 bps, and the digital compatible method performs high-speed transmission of 64 Kbps.

In this way, various data terminal devices are connected to the current data communication network, and this connection form is shown in FIG. Here, the ISDN terminal means a data terminal device that has a digital transmission function, and is a data terminal device that has a built-in digital transmission function, or a combination of a data terminal device and a digital adapter (an adapter that operates in a digital compatible method). This applies. In addition, a non-ISDN terminal means a data terminal device having a modulation method transmission function,
This includes a data terminal device with a built-in ODEM, or a combination of a data terminal device and an analog adapter (an adapter that operates in an analog compatible system). ISD
An ISDN terminal 102 , a data terminal device 104 connected via a digital adapter 103 , and a data terminal device 106 connected via an analog adapter 105 are connected to the N network 100 , and a telephone exchanges data with the ISDN network 100 . A non-ISDN terminal 107 is connected to M4101. The ISDN terminal 102 and the digital adapter 103 exchange data with ISDN mloo at 54 Kbps, and the analog adapter 105 and non-ISDN terminal 107 exchange data at 1200 bps.

(C) Problems to be Solved by the Invention As described above, even data terminal devices connected to the same communication line network cannot perform data communication unless the communication method is the same. In other words, between ISDN terminals that transmit data at high speed of 64 Kbps, or 1200
It has the disadvantage that it can only be performed between non-ISDN terminals that transmit data at a low speed of bps. For this reason, in a communication system consisting of existing data terminal equipment that performs low-speed transmission, even the data terminal equipment connected to the ISDN network must be configured for low-speed transmission, and even high-speed transmission between data terminal equipment within ISDNy4 is required. There is a drawback that it is not possible to
Because the advantages of the ISDN network cannot be effectively utilized, ISDN
There was a drawback that the transition could not be made smoothly. In addition, when ISDN terminals and non-ISDN terminals coexist in a data communication network, it is necessary to set up two centers to communicate with each terminal, which is expensive, and it is difficult to exchange data between the two centers. There were disadvantages such as troublesome processing.

An object of the present invention is to provide a data terminal device that solves the above problems by switching between high-speed transmission and low-speed transmission according to the partner station.

(d) Means for Solving the Problems The data terminal device of the present invention is connected to an ISDN network, converts data to be transmitted into packets, and transmits data to an ISD.
A packet converter that unpackets the signal arriving from the N line, and an M unit that modulates and encodes the data to be transmitted and restores and demodulates the signal that arrives from the ISDN network.
Is the communication partner a terminal device that has an ODEM-CODEC circuit and performs packet-switched communication?
Alternatively, a table for storing whether the terminal device performs modulation method communication, and when transmitting data to a specific communication partner, the data is transmitted to the packet converter or M O based on the table.
A transmission switching means input to the D E Pvl-COD E C circuit, and when a signal arrives from the ISDN network, the structure of this signal is judged and the transmission switching means input to the packet switch or MODEM-COD.
A reception switching means for inputting to the EC circuit is provided.

(e) Operation In the data terminal device of the present invention, when transmitting data, it is possible to determine what kind of terminal the communication partner is (whether it is an ISDN terminal or a non-ISDN terminal) by searching a table. to decide.

The processing method is switched based on this judgment. That is,
When it is an ISDN terminal, it sends out packetized data for high-speed transmission, and when it is a non-ISDN terminal, it sends out a signal that has been modulated and encoded so that it can be transmitted over a public telephone line.

Also, when data is received from ISDNy4, the structure of the data is determined, and if the data is packetized, it is input to the packet converter and unpacketized.
If the data is not packetized, MOD E
The M-CODE C circuit decodes and demodulates and reads the data.

In this way, it is possible to process both high-speed and low-speed transmission, and it is also possible to automatically switch between these methods depending on the configuration of the destination data terminal device and the configuration of the received data. It is also possible to smoothly transition from a telephone line network to ISDNlil.

(FIG. 2 shows the configuration of a data communication system to which this invention is applied. This system is an unmanned operation system for a bank. ISDN m2 includes a monitoring center 1 and an unmanned store 3.
equipment is connected thereto, and furthermore, a public telephone line network 5 is connected via a -CODEC 4. ISDNm2 also transmits analog signals after being quantized and encoded (PCM), so 1. Encoding is required when sending a signal from the public telephone line 5 to the ISDN 12, and decoding is required when sending a signal from the ISDN 2 to the public telephone line 5, for which a -CODEC (encoder/decoder) 4 is connected. Equipment of an unmanned store 6 is connected to the public telephone line network 5. The equipment of monitoring center 1 is CRMC (central monitoring device) 10-ISDN adapter 11-DSU (
data terminal device) 12. DSUI 2 is ISDN
Connected to network 2. CRMCIO monitors abnormalities and controls power on/off of ATMs installed in unmanned stores. ATM33-RMC32-adapter 31-DSU30 are installed in the unmanned store 3. adapter 3
1 has a function of transmitting and receiving packets to and from ISDN m2. An RMC 60 is installed in the unmanned store 6 along with an ATM 61. This RMC60 has NCU-MODEM
The data received from the ATM 61 is frequency-modulated and sent to the line network, and the data received from the line is demodulated and sent manually to the ATM 61.

FIG. 1(A) is a block diagram of the ISDN adapter 11. The ISDN adapter 11 is connected to the CRMCIO by an R3232C interface 111. This R3-232C interface 111 is connected to a controller 110 and a switch 112.

The switch 112 is the destination of the input data (communication partner)
selectively connects the R5-232G interface 111 to the packet converter 113 or MODEM 114. The packet converter 113 is further connected to a layer 1 circuit 117 via a switch 116. MODEM
114 is connected to -CODECI 15, -CODE
C115 is connected to layer 1 circuit 117 via switch 116. The layer 1 circuit 117 is a circuit that edits data to conform to the communication specifications of the ISDN network 2.

The switch 116 is switched to the same side in conjunction with the switch 112.

Data to be transmitted and its destination are input from CRMCIO. Controller 110 controls switching of switches 112 and 116 based on the destination. In other words, if the destination data terminal device is an SDN terminal, it is switched to the packet converter 113 side, and if it is a non-ISDN terminal, it is switched to the M
Switch to ODEMII4-CODECI 15 side.

Also, when a signal such as IsDNN22 arrives, if the signal is a packet, switch 112 and 116 are switched to the packet converter 113 side, and if the signal is not a packet, MODEM
114 Switch to C0DF, C115 side. When a signal arrives, the layer 1 circuit 117゜packet converter 11
3. - CODECI 15 - MODEM 114 each performs the opposite function when transmitting data.

This ISDN adapter 11 and CRMCIO constitute a data terminal device of the present invention. In other words, the data processing function and data conversion function are the ISD of this embodiment.
N adapter 11. It may be a separate device like CRMClo, or it may be configured as an integrated device.

FIG. 2B is a schematic diagram of a table provided in the controller 110. This table shows the phone number of each terminal (ATM of unmanned store) and the ISD of this terminal.
A type code is stored that distinguishes whether the terminal is an N terminal or a non-ISDN terminal.

When the type code is "1", the terminal is an ISDN terminal, and when the type code is "0", the terminal is a non-ISDN terminal. When the CRMCIO inputs the data and the destination phone number, the ISDN
Determine terminal/non-ISDN terminal.

FIG. 3 shows the controller 110 of the ISDN adapter.
and a flowchart showing the operation of each part. Same figure (
A) shows the operation when sending data; nl receives the destination telephone number and the data to be sent from the CRMC. The table is searched by the sending optical telephone number (n2), and it is determined whether the destination data terminal device (ATM) is an ISDN terminal (n3). If it is an ISDN terminal, switch switches 112 and 116 to the packet converter 113 side (
n4), if it is a non-ISDN terminal, MODEMl 14-
Switch to CODECI 15 side (n5). This is the operation of the controller 110.

After this, the packet converter 113 converts the data into packets (n6), and the converted data is sent to the IS in the layer 1 circuit.
Edited to a format that conforms to DN specifications (n7)
, transmitted in a packet-switched manner (n8), and also MOD
EMI 14 modulates the data to be transmitted (9),
- After quantization with CODEC115 (n 10),
It is edited by the layer 1 circuit 117 (nil) and transmitted using the line conversion method (n12).

(B) of the same figure shows the operation when receiving data. IS on n21
When an incoming call from DN line 2 is detected, it is determined whether this signal includes the sender's telephone number data (whether or not it is a CN packet) (n22). If it is a CN packet, search the table using the sender's telephone number (n23) and determine whether this station is registered in the table (n23).
24).

If registered, the switches 116 and 112 are switched to the packet converter 113 side (n 25) and the received data is input to the packet converter 113. If the data is not registered, the data is deemed invalid and the line is disconnected (n31). In addition, if the telephone number of the sender is not stored in the received signal, the switch 116 or 112 should be set to CODEC-MODE because the analog signal was encoded and sent.
Switch to the M side (n28). This is the operation of the controller 110.

After this, the packet converter 113 unpackets the data (n27) and sends it to CRMCl 0 (n27
), -CODECI 15 decodes the code and converts it to an analog signal n29), MODEMI
In step 14, the modulated data is demodulated (n 30). After this, the data is transmitted to CRMC (n27).

The operations n1 to n5 correspond to the transmission switching means of the present invention,
The operations n22 to n25 and n28 correspond to the reception switching means of the present invention.

In this embodiment, the destination table is provided in the controller 110 of the ISDN adapter 11, but it may also be provided in the main body of the data processing device (CRMC).

(g) Effects of the Invention As described above, according to the data terminal device of the present invention, the IS
DN terminal 2 It is possible to send and receive data to and from any non-ISDN terminal, and it also determines whether data communication is with an ISDN terminal or not based on the communication partner at the time of transmission and the structure of the signal at the time of reception. Since it is possible to automatically determine whether data communication is with an ISDN terminal, data communication can be smoothly performed with any data terminal device. Thereby, it is possible to smoothly transition to ISDN while utilizing existing non-ISDN terminals. Also, if this data terminal device is used as a data communication center,
No matter what kind of terminal device is installed, ISDN terminal or non-ISDN terminal, data communication with it can be ensured.

FIG. 3 is a flowchart showing the operation of the ISDN adapter when transmitting and receiving data. FIG. 4 is a diagram showing a connection form of data terminal equipment connected to a communication line.

10 CRMC, 11 ISDN adapter, 110-controller, 112.116-switcher.

Claims (1)

[Claims] (1) Connected to the ISDN network, converts data to be transmitted into packets, and connects the ISD
A packet converter that unpackets the signal arriving from the N network, and an M that modulates and encodes the data to be transmitted and restores and demodulates the signal that arrives from the ISDN network.
Is the communication partner a terminal device that has an ODEM-CODEC circuit and performs packet-switched communication?
Alternatively, a table for storing whether the terminal device performs modulation communication, and when transmitting data to a specific communication partner, the data is transmitted to the packet converter or MOD based on the table.
A transmission switching means input to the EM-CODEC circuit, and when a signal arrives from the ISDN network, the configuration of this signal is determined and the transmission switching means is connected to the packet switch or the MODEM-COD.
A data terminal device comprising: a reception switching means for inputting to an EC circuit.