KR960003029B1 - Isdn telephone - Google Patents

Abstract

The ISDN telephone comprises an "S" interface matching unit for an "S" interfacing of the ISDN; a data matching unit connected to the "S" interface matching unit, for servicing data via a data terminal device; a handset connected to the "S" interface matching unit, for servicing a sound call; a controller connected to the "S" interface matching unit, for controlling the sound communication with the handset and the data communication with the data matching unit and controlling to display the sound and data communication states according to a key input; a key pad unit for inputting a selection key from the controller unit; a display unit for displaying the sound and data communication states; a ROM for storing a program data for controlling the sound and data communication according to the CCITT 1-400 protocol; a RAM for storing the program and data to be processed at the controller; and a decoder for selecting the ROM and RAM by the control signal output from the controller.

Description

Telephone for general information communication network and its control method

1 is a configuration diagram of a conventional communication network.

2 is a circuit diagram according to the present invention.

3 is an outgoing flow chart with ISDN in accordance with the present invention.

4 is a flowchart of incoming execution from ISDN according to the present invention.

5 is a hierarchical processing relationship diagram according to the present invention.

The present invention relates to a terminal device in an integrated network (ISDN) of the present invention, and more particularly, to a telephone for an integrated telecommunication network and a control method thereof, in accordance with the "S" interfacing of CCITT Recommendation I-430. .

In general, ISDN telephones provide a multi-service telephone function or a function for processing various additional services provided by ISDN in addition to the simple voice communication function of conventional telephones as shown in FIG. 1, and sometimes existing data terminals and personal computers (pc). It serves as a terminal adapter for connecting to ISDN.

An important feature of the ISDN telephone is that it has a text display device that can be used to display directory numbers and other information. In addition, buttons for establishing a connection and function keys for executing additional services of the ISDN telephone are arranged on the keypad. On the other hand, ISDN basic telephones have only a few function keys needed to select additional services, but gradually more and more function keys are based on their function, namely block name key block and call forwarding, call shape conversion or automatic call waiting. And a key block for a specific call setup function such as an additional service key block for providing a subscriber with information such as an input call registration and a billing notification. The ISDN telephone may also be equipped with a card reader for identifying each user in different applications, such as charging for individual line users and transferring calls to long distance initiation.

Indicated by the acoustic signal of the incoming signal VF, the voice unit converts the voice signal from analog to digital data or performs the reverse function. Although voice signals of ISDN are mainly encoded into digital data by PCM, a coding scheme such as ADPCM may be used to improve transmission efficiency. The terminal control has key input scanning, control of the display of the ISDN telephone, and B channel selection initiated by the exchange. In fact, the great technical complexity of digital telephones compared to conventional telephones is mainly due to the introduction of digital control channels according to voice coded transmission.

In an analog telephone network, incomplete attenuation of a hybrid circuit that separates the direction of transmission of a voice signal generates a native call that is echoed to the telephone receiver, causing a singing phenomenon. In order to prevent noise, the feedback signal in the non-operational transmission direction is artificially attenuated, and the signal in the other transmission direction is amplified according to the line attenuation in order to obtain an appropriate reception volume. More specifically, it is noted that the publication of the book "Zidari" Inc. is published in the "194-196" pages of "Introduction to the Comprehensive Information Network Technology." In the CCITT, the connection between ISDN subscribers and network interfaces is recommended in class I 400, especially for ISDN phones in I-430 of physical layer 1, I-441 of data link layer, and I-451 of network layer. I-430 recommends the characteristics necessary for transmitting information by B and D channels at the S or T reference point in terms of subscriber and network interfacing, namely timing, synchronization and coding, and wiring structure feeding method.

The above-mentioned I-441 relates to a Link Access Protocol (DAP) channel (X.25). The protogol exchanges information in a point-to-point or absolute multipoint manner between a plurality of access endpoints connected to Layer 3 with mutual compatibility. It provides a means and recommends that all data link layer messages be transmitted frame by frame.

I-451 has a function of establishing, maintaining, and terminating a network connection through ISDN, and recommends that network connection is performed through layer 3 in circuit switching and packet switching.

In Korea, the development of ISDN digital telephones is in progress, but it is not at the completion stage, and in the case of foreign countries, it is implemented according to its own protocol and thus lacks international versatility provided to subscribers. In case of interworking between the subscriber and the network, and the interworking between the subscribers and the network is impossible, there is a problem of undergoing a complicated protocol conversion process.

It is therefore an object of the present invention to provide an ISDN telephone commercially available as a multifunctional terminal having international standardization and versatility recommended in series I-400 of subscriber-to-network CCITT.

Another object of the present invention is to provide an ISDN telephone capable of communicating data and voice at the same time.

The present invention for performing the above object is an S interface matching unit for the "S" interface of the ISDN network, a data matching unit connected to the S interface matching unit for serving data through a data terminal device, and the S interface matching A handset connected to the mobile terminal to service a voice call, and connected to the S interface matching unit to control voice communication with the handset and data communication with the handset in a comprehensive information communication network, and voice and data communication according to key input. A controller for controlling the display of status, a keypad for inputting a function selection key to the controller according to a function, a display for displaying the status of voice and data communication in the ISDN network, and a CCITT I- of the ISDN network of the controller. ROM which stores program data for controlling voice and data communication according to 400 protocols, And a decoder for storing the program and data processed by the controller, and a decoder for selecting the ROM and the RAM by a control signal output from the controller.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a telephone circuit diagram for an ISDN according to the present invention, which includes a keypad unit 101, a status display unit, an LED, an LCD, a voice call unit, a handset 40, a speaker 40, and a power unit 50 for supplying power. In an ISDN telephone having an I), the S interface matching circuit 30 is connected to the ISDN network through the lines T1 and T2 through the transformers T1 and T2, and between the secondary coils of the transformers T1 and T2. The power supply unit 50 supplies power, and the connection criteria for passing through the transformers T1 and T2 are frame configuration electrical characteristics of “S” interfacing standards. In accordance with the recommendation of CCITT I-430, which transmits and receives data formed in a multichannel structure of 2B + D (B = 64 Kbps, D = 16Kbps) under the control of the controller 20. This can be fully realized by the "Digital Subscriber Controller (DSC)" of the "AM79C30A" of the US "Advanced Micro Devices". The functions of the AM79C30A and the features of the S / T interfacing standard of CCITT I-430 will be described in more detail in the data book of "Advanced Micro Device".

It is connected to make a voice call with the handset 40 under the control of the S interface matching circuit 30, and controls data communication with a data terminal (not shown) through the data matching unit 42. .

The control according to the "S" interface of CCITT Recommendation I-430 of the S interface matching circuit 30 is executed by the controller 20. The controller 20 is a microprocessor "80C32" of the US "Intel". ”Is possible. The S interface matching circuit 30 is connected to the controller 20, the data bus 203, the control bus 202, and the address bus 201, and processes the programs mounted on the ROM 22 to match the S interface. The circuit 30 is controlled so that service is performed through the handset 40 or the data matching unit 42 for voice and data transmitted and received from the ISDN network.

RAM temporarily stores programs and data that are executed. The ROM and RAM may also be connected to the controller 20, the address bus 201, the data bus 203, and the control bus 202 to control program data and general data under the control of the controller 20. You can read / write.

The ROM RAM decodes the address signal generated by the controller 20 by the decoder 21 to generate a selection control signal according to read / write of data.

The keypad 101 and the LED, which is the display unit, are controlled by the peripheral matching circuit 10. The peripheral device matching circuit 10 is connected to the controller 20, the address bus 201, the data bus 203, and the control bus 202 to receive data keyed in from the keypad 101. The controller 20 transmits the processing state data of the controller 20 to the LED or the LCD to control the driving. The keypad 101, the LED, and the LCD are also configured to be selectively enabled by the output of the decoder 21.

3 is a flow chart of outgoing calls to an ISDN network in accordance with the present invention.

Referring to FIG. 2, a processing example of an outgoing call from an ISDN telephone to an ISDN network is described. First, an ISDN telephone is interfaced to transmit D-channel data by voice on two B-channels in a 2B + D channel. Accordingly, the B channel is a channel for transmitting and receiving voice data of 64 Kbps, and the D channel is used as a data transmission channel for signaling, which is signal processing for call control. It has a hierarchy of I-430, I-441, and I-451. Briefly describing I-430, I-441, and I-451, I-430 is a physical layer of an ISDN subscriber-network interface that transmits an electrical signal by transmitting a 2B + D type data in a format. 441 is an error recovery procedure for transmitting call control on the D channel without error through a physical layer, and is a layer for managing transmission error check sum and transmission sequence. I-451 recommends the format and processing of call control signals.

For the voice call in the ISDN telephone, when the handset 40 is lifted, the hook-up sensing signal H of the S interface matching circuit 30 is “high” and the S interface matching circuit 30 senses that the data is hooked off. It passes to the controller 20 via the bus 203. In step (3a), the controller 20 detects this and checks whether the first layer (I-430) for voice call is in an activation state from the program data stored in the ROM in step (3b). In the first layer, as shown in FIG. 5, the controller 20 controls the LCD and the LED through the hook state sensing and the ring tone control peripheral matching circuit 10 through the S interface matching circuit 30. That is, check whether the preparation is completed according to the recommendation of CCITT I-430. If the first layer is not activated in step (3b), the controller 20 requests the first layer activation in step (3C). Information via the B and D channels at the reference point of the "S" interfacing with the ISL network and the connection with the lines L1-L4 via the S interface matching circuit 30 according to the program on the ROM and the data on the RAM. Synchronize by setting up the characteristics necessary for transmission, that is, timing, synchronization and coding, wiring structure, and feeding method. Through the peripheral matching circuit 10, the LEDs and LCDs for the display and the state of the keys through the keypad unit 10 are prepared.

However, if the first layer is activated in step (3b), the controller 20 uses the S interface matching circuit 30 to obtain a terminal end point identification (TEi) of each terminal for the terminal to use the ISDN network. It is allocated from the ISDN network, in which the controller 20 reads through the S interface matching circuit 30 in step 3d to check whether TEi has been allocated before.

If the assignment is not made in step 3d, the controller 20 controls the S interface matching circuit 30 in step 3e to execute the procedure for receiving the ISDN network and the TEi. If the TEi is allocated from the ISDN network through step (3e), it checks whether a layer 2 link is established in step (3f). The protocol of the second layer relates to a LAPD (Link Access Protocol-D Channel) as shown in FIG. 5, and when a link is not set in the process (3f), an error is generated according to the request for allocation of the second layer in the process (3g). As a link setting for processing, the controller 20 controls the S interface matching circuit 30 to transmit “SABME” to the ISDN network. Accordingly, the response signal of the ISDN network sends “UA” to the ISDN telephone side for reception.

As described above, the controller 20 transmits the “SABME” through the S interface matching circuit 30 in the process (3f) (3g), and when the reception of the response signal from the ISDN network is confirmed, the ISDN telephone and Link establishment with the ISDN network is established. In step (3h), the controller 20 transmits a setup message from the RAM to the S interface matching circuit 30, and the S interface matching circuit 30 transmits a setup message to the ISDN network. Signals that the ISDN phone is hooked off.

In step (3i), it checks whether the response message is received from the ISDN network according to the transmission of the setup message signal through the empty channel among the B1 and B2 channels with the S interface matching circuit 30. This is for the three-layer CCITT I-451, which establishes and maintains or terminates the ISDN network. In step (3i), if there is an unoccupied channel among the 2B + D channels between the subscriber and the ISDN network, the controller 20 selects an appropriate channel to display B1 / B2 on the channel information in the setup recognition message and displays the information on the LCD. When the status is displayed, the user receives the dial digit input to the controller 20 through the peripheral matching circuit 10 in the process (3j) when dialing the keypad 101.

However, if the setup recognition signal is not received in step (3i), it checks whether the release (Release) or Release complete message from the ISDN network in step (3o). When the release or release is a message indicating the completion date in step (3o), the ISDN telephone which receives this signal in step (3P) becomes unavailable.

However, when the release / release completion message is received in step (3o) or when the digit is input in step (3j), the S interface matching circuit 30 determines whether a call proceeding message is received in step (3k). The controller 20 checks the signal output from the controller 20. When the call forwarding path is received in step (3k), an alert message generated when the other party rings a ring by transmitting the digit-related information to the network in step (3j) is received. Check in step 3l). If there is no alert signal, the process proceeds to (3o) and if there is an alarm signal, the other party receives the information that the other party hooked off, that is, a message from the ISDN network. Call starts by connecting 64kbs channel of B1 / B2.

In the case of data, the controller 20 controls the S interface matching circuit 30 by a program on a ROM to perform data communication according to a protocol (V.110) defined through the data matching unit 42. do. In the case of data, when the data matching unit 42 transmits the hook-off state information to the controller 20 through the S interface matching circuit 30, as in the voice communication, the controller 20 transmits (3a) of FIG. )-(3g), synchronize the line between ISDN network and telephone for data transmission, get TEi, identification number for each terminal from ISDN network, and set up link for error handling. BEARER CAPABICITY ”is transmitted to the ISDN network side to indicate that the data terminal side has hooked off. Mark on and receive information that you are connected. When the channel is connected as described above, the data matching unit 42 converts 600-19200bps, which is a commercial terminal transmission rate, to a speed of V.110 that matches the B channel of 64Kbps.

A case of performing an input call from an ISDN network to an ISDN telephone will be described with reference to FIG. The controller 20 receives the setup message from the ISDN network through the S interface matching circuit 30 in step 4a. The controller 20 analyzes the “BEARER CAPABICITY” information of the setup message in step 4b. Analyze and check if it is voice communication. When it is about voice in step (4b), it is checked whether voice is available in step (4c). When the voice is not available in step (4c), the release signal is transmitted to the ISDN network in step (4k), and the call is disabled in step (41).

When voice is available in step 4c, the controller 20 transmits an alarm signal to the ISDN network and generates a ring signal in the phone in step 4d. In step 4d, the hook-off state is checked in step 4e as the ring signal is generated. In the process (4e) when the hook-off is transmitted to the ISDN network signal is connected and the S interface matching circuit 30 connects the voice call line to make a call through the handset 40.

However, when the controller 20 receives the setup message in step (4a) and the data is in step (4b), the controller 20 checks whether data is used in step (4g). When the data is not available in step 4g, the release signal is transmitted to the ISDN network in step 4k, and the call is made unavailable in step 41. When data is available in step (4g), an alarm signal according to data usage is transmitted to the ISDN network in step (4h), and a ring is received according to data reception.

When the hook-off for receiving data from the data matching unit 41 is received through the S interface matching circuit 30, the controller 20 transmits a connection signal to the ISDN network through the S interface matching circuit 30 and receives data. Connect the lines to allow data reception. In FIG. 2, the power unit 50 for supplying power to the transformers T1 and T2 requires a DC voltage of -18 to -60 (V) for long distance supply, which is a normalized + 5V power supply. The data matching section 42 conforms to X.21 and X.24.

As described above, in accordance with I series I-430, I-441, and I-451, it is possible to follow the standardized universality of the network termination, i.e. the switch, at the subscriber-to-network interface, but it must match the standardized handsets and data terminals. Therefore, there is an advantage that data and voice communication can be executed simultaneously in the ISDN terminal.

Claims (3)

In an ISDN telephone combined with an integrated telecommunication network, an "S" interface matching unit for an "S" interface of an ISDN network, and a data matching unit connected to the "S" interface matching unit to serve data through a data terminal device. And a handset connected to the “S” interface matching unit to service a voice call, and a voice set-up and data communication with the handset connected to the “S” interface matching unit to communicate with the handset in a general information communication network. A controller unit for controlling and displaying a voice and data communication state according to a key input, a keypad unit for inputting a selection key to the controller unit according to a function, a display unit for displaying the state of voice and data communication in the ISDN network; And a program for controlling voice and data communication according to the protocol of CCITT I-400 of the ISDN network of the controller unit. A general information communication network comprising: a ROM storing data; a RAM storing a program and data processed by the controller; and a decoder selecting the ROM and RAM by a control signal output from the controller; ISDN telephone combined. A voice and data transmission method of an ISDN telephone combined with a general information communication network, comprising: synchronizing a line with an ISDN network when the voice and data terminal is in a hook-off state, and receiving a usage identification number of each terminal from the network; And a second process of transmitting a signal for link establishment for error processing and receiving a response signal to inform the hook-off state when the terminal has received the use identification number of the terminal in the first process; and the second process. In the third step of finding a channel to transmit / receive voice / data by transmitting a setup message after notifying the network of the hook-off state, and when the channel is found to communicate with the network by receiving a response signal after transmitting the setup message in the third step, Ring ring that calls the other party from the network when receiving the call progress signal according to the digit transmission by transmitting the other party's telephone number A fourth step of receiving an alarm signal indicating that a call is ringing and receiving a signal of being connected; and connecting the channel found in the third step when receiving an alarm signal and a connection signal which are regarded as normal connection according to the call of the other party in the fourth step; The voice and data transmission method of the ISDN telephone coupled with the integrated information communication network, characterized in that the fifth process for the voice data communication. A voice and data reception method of an ISDN telephone coupled to an integrated telecommunication network, the method comprising: a first step of discriminating whether a voice call or a data communication is performed from setup message information received from the integrated telecommunication network; A second step of checking whether or not the voice call is possible and transmitting an alarm signal according to the usability when possible, transmitting a connection signal when the hook is off by ringing, and connecting a voice line, and making a data call in the first step. The third step is to check the availability of data communication, send an alarm signal when the data is available, send a signal that is connected when hooking off by ringing the data ring, and communicate data by connecting data lines. Voice and data of ISDN telephones combined with an integrated telecommunications network characterized by Receive method.

Images