KR950003522B1 - Isdn network termianl equipment using 2 binary 1 quaternary line code - Google Patents

Abstract

The apparatus for matching the ISDN terminal of an exchange system with subscribers, includes a subscriber line matching unit (11) for converting analog data from the subscriber line into binary data and converting binary data into analog data, an ISDN line matching unit (10) for converting the binary data into 4-ary AMI (alternato mark inversion) codes to output the AMI code signal to the ISDN line and converting the AMI codes into binary data to output the binary data to the unit (11), a control unit (8) for controlling the units (11)(10), a maintenance unit (6), a DC/DC power converter unit (3) for power failing, and an AC/DC power converter unit (4). The apparatus improves the cross-talking charactristic.

Description

ISDN Network Termination Device using 2B1Q Line Code

1 is a block diagram of an ISDN network termination device according to the present invention.

* Explanation of symbols for main parts of the drawings

1: subscriber line 3: DC / DC power conversion unit

4: AC / DC power conversion unit 6: Maintenance unit

8 control unit 9 ISDN line

10: ISDN line matching unit 11: subscriber line matching unit

The present invention relates to an ISDN network termination device for matching an ISDN terminal device of an exchange and a subscriber in an Integrated Services Digtal Network (ISDN). The present invention relates to an ISDN network termination apparatus that transmits and receives information using a method (2Binary 1 Quaternary: a line code method of converting two binary data into one binary data).

When the signal information, voice information, and data information transmitted from the exchange are transmitted to the ISDN network terminator through the existing telephone line, the ISDN network terminator extracts the reference clock, voice, data information, etc. The code is converted into a form and transmitted to the ISDN terminal. In addition, when the signal information, voice information, and data information transmitted from the ISDN terminal in a predetermined code form are transmitted to the ISDN network terminating device, the ISDN network terminating device converts the information into another form and converts the information into another form to the exchange side through the telephone line. send.

Conventionally, when matching an ISDN terminal and a switch, an ISDN network termination device using a 4B3T or Bi-Phase line code has been used in view of the current line having two lines on the switch side.

The 4B3T scheme is a line code scheme for converting four binary data transmitted from an exchange into three ternary data. The bi-phase scheme is a line code scheme for transferring binary data transmitted from an exchange as a function of phase change. to be.

The conventional ISDN network termination device uses 4B3T or bi-phase line code to transmit information, so the signal-to-noise ratio (S / N) characteristics are good, but the transmission distance between the switch and the ISDN network termination device is good. Short and short-term crosstalk characteristics have a disadvantage.

In addition, the ISDN network termination device of the existing is not able to communicate due to the power supply to its internal circuit and ISDN terminal when the power outage, there is a problem that can not communicate, the operator does not have support for the maintenance function in the network termination device There is a problem that cannot be easily maintained.

The present invention has been made to solve the above-mentioned problems comprehensively, by transmitting and receiving information in the 2B1Q code method, to extend the transmission distance of the exchange and to improve the crosstalk characteristics, to improve the call quality, and to have its own internal circuit in case of power failure Its purpose is to provide ISDN network termination device using 2B1Q line code which prevents communication interruption in case of power failure by supplying DC power to ISDN terminal and ISDN terminal, and supports maintenance. have.

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

ISDN network termination device according to the present invention, as shown in Figure 1 DC / DC power conversion unit 3, AC / DC power conversion unit 4, maintenance unit 6, control unit 8, ISDN The line matching unit 10 and the subscriber line matching unit 11 are provided. The AC / DC power converter 4 converts the commercial AC power (90-205 V) into a DC power (5 V) and supplies it to the control unit 8, the ISDN line matching unit 10, and the subscriber line matching unit 11 side. At the same time it is supplied to the ISDN terminal through the ISDN line (9). The DC / DC power converter 3 converts the DC power applied from the exchanger through the subscriber line 1 into a 5V DC power supply in case of power failure to match the controller 8, the ISDN line matching unit 10, and the subscriber line. At the same time as supplying to the unit 11 side, it is supplied to the ISDN terminal side via the ISDN line 9. The subscriber line matching unit 11 converts the analog information applied through the subscriber line (1: 2 lines) from the exchange into binary data and outputs it to the ISDN line matching unit 10, and outputs the ISDN line matching unit ( The binary data applied from 10) is converted into analog information and outputted to the exchange side through the subscriber line (1). The ISDN line matching unit 10 converts the binary data applied from the subscriber line matching unit 11 into an AMI (Alternate Mark Inversion) code in the form of a ternary data, thereby converting the ISDN through the ISDN line (9: 4 lines). It outputs to the terminal side, and converts the AMI code of the binary data type applied from the ISDN terminal through the ISDN line 9 into binary data and outputs it to the subscriber line matching unit 11 side. The control unit 8 is composed of an 8-bit microprocessor, controls the operation of the ISDN line matching unit 10 and the subscriber line matching unit 11, and whether or not the 5V power supply is abnormal depending on the maintenance unit 6 requirements. In addition, the maintenance unit 6 provides information regarding maintenance, such as whether transmission / reception synchronization between the ISDN line matching unit 10 and the subscriber line matching unit 11 and self-diagnosis is performed. The maintenance unit 6 is connected to the control unit 8 to perform maintenance information such as whether there is an abnormality of a 5V DC power supply, whether the ISDN line matching unit 10 and the subscriber line matching unit 11 transmit and receive synchronization, and self-diagnosis. To provide.

The ISDN network termination device of the present invention operates as follows.

When commercial power is applied in an uninterrupted state, the AC / DC power converter 4 converts the commercial AC power (90-250 V) to a DC power (5 V) to control the control unit 8, the ISDN line matching unit 10, It is supplied to the subscriber line matching unit 11 and the ISDN terminal, and when the power supply is not applied in the power failure state, the DC / DC power conversion unit 3 is applied to the DC power supply 5V through the subscriber line 1 It converts into a power supply and supplies it to the control part 8, the ISDN line matching part 10, the subscriber line matching part 11, and an ISDN terminal side. The AC / DC power converter 4 can supply power to up to seven ISDN terminals (when each terminal consumes 2W) during non-interruption, and the DC / DC power converter 3 within the 500mW range during power failure. Supply power.

When information is transmitted and received with the ISDN terminal during the exchange period, the information is transmitted and received via the ISDN line matching unit 10 and the subscriber line matching unit 11. The ISDN line matching unit 10 converts the AMI code of the binary data type that is applied from the ISDN terminal through the ISDN line 9 into binary data under the control of the control unit 8 so that the subscriber line matching unit 11 side. The binary data applied from the subscriber line matching unit 11 is converted into an AMI code in the form of a binary data under the control of the control unit 8 and transmitted to the ISDN terminal side through the ISDN line 9. In addition, the subscriber line matching unit 11 converts the binary data applied from the ISDN line matching unit 10 into analog information under the control of the control unit 8 and transmits the analog data to the exchange side through the subscriber line 1, The analog information applied from the exchange through the subscriber line 1 is converted into binary data under the control of the controller 8 and supplied to the ISDN line matching unit 10 side.

The controller 8 controls the information transmission / reception operation of the ISDN line matching unit 10 and the subscriber line matching unit 11 when information is transmitted / received during the exchange period with the ISDN terminal, and 5V according to the request of the maintenance unit 6. The maintenance unit 6 provides maintenance information on whether the DC power supply is abnormal, whether the ISDN line matching unit 10 and the subscriber line matching unit 11 transmit and receive synchronization, and self-diagnosis.

The maintenance unit 6 maintains maintenance information on whether 5V DC power supplied from the control unit 8 is abnormal, whether the ISDN line matching unit 10 and the subscriber line matching unit 11 transmit and receive synchronization, and self-diagnosis. To allow the operator to easily maintain the ISDN network termination device.

As described above, when the ISDN network termination apparatus of the present invention transmits and receives information, the subscriber line matching unit 11 converts the analog information from the subscriber line 1 into binary data, and the subscriber line matching unit ( 11) converts the binary data from the ISDN line matching unit 10 into hexadecimal data and outputs the binary data to the ISDN line 9 side. On the contrary, the binary data applied from the ISDN line 9 is transferred to the ISDN line matching unit. (10) converts into binary data, converts binary data from the ISDN line matching section 10 into analog information by the subscriber line matching section 11, and outputs it to the subscriber line 1 side, Since the information is transmitted and received by the 2B1Q code method, the distance from the exchanger can be extended up to 5,5 km and the crosstalk characteristic is improved, compared to the conventional 4B3T code method or the bi-phase code method. have. In addition, the ISDN network termination device of the present invention converts the DC power applied from the exchanger through the subscriber line 1 to 5V by the DC / DC power conversion unit 3 at the time of power failure, and thereby internal circuit of the ISDN network termination device. Since it is supplied to the ISDN terminal and the ISDN terminal can be a basic call even in the event of a power outage, the maintenance is supported by the maintenance unit 6 can be facilitated maintenance.

Claims (1)

An ISDN network termination device that transmits information transmitted and received during an exchange period connected through an ISDN terminal connected through a four-wire ISDN line and a subscriber line of two lines, converting analog information applied from the subscriber line into binary data. A subscriber line matching unit 11 for outputting the converted binary data into analog information and outputting the converted binary data to the subscriber line; Converts binary data applied from the subscriber line matching unit 11 into an AMI code in the form of a binary data and outputs the binary data to the ISDN line, and outputs the AMI code in the form of a binary data applied from the ISDN line. An ISDN line matching unit 10 for converting into and outputting to the subscriber line matching unit 11; Control the operation of the subscriber line matching unit 11 and the ISDN line matching unit 10, according to the request for the provision of maintenance information, whether or not the DC power supply, the subscriber line matching unit 11 and the ISDN line matching unit ( 10) the control unit 8 and outputting maintenance information regarding synchronization of transmission and reception and self-diagnosis; Whether to provide the maintenance information to the control unit (8) shaft abnormality of the DC power applied from the control unit 8, whether the subscriber line matching unit 11 and the ISDN line matching unit 10 transmit and receive synchronization and A maintenance unit 6 for outputting maintenance information on self-diagnosis so that an operator can check it; DC / DC to convert the DC power applied from the subscriber line to a DC voltage of a predetermined voltage at the time of power failure and to supply to the controller 8, the ISDN line matching unit 10, the subscriber line matching unit 11 and the ISDN terminal side. The DC power converter 3 and the non-interruptible commercial AC power are converted into DC power of a predetermined voltage to the controller 8, the ISDN line matching unit 10, the subscriber line matching unit 11, and the ISDN terminal side. ISDN network termination device using a 2B1Q line code, characterized in that it comprises an AC / DC power supply conversion unit 4 for supplying