KR100336512B1 - Apparatus for embedded network termination in simple private exchange - Google Patents

Abstract

The present invention relates to an ISDN network terminal connected to an exchange, and in particular, it does not use a terminal adapter for a matching connection, so that the corresponding cost can be reduced, and in the dies terminal for data communication, 2B1Q of the exchange A U port for connecting with a two-wire U line by a transmission method; A U / S transceiver for processing a 2B1Q signal input through the U port and converting the signal into a 2B + 1D signal and connecting with an AMI transmission method to perform a U / S interface, and the S of the U / S transceiver The S / T transceiver has a T port connected to the port and performs an S / T interface. The S / T transceiver is simple and easy to install, and it removes phenomena such as noise disturbances and improves signal reliability. And it can reduce facility and maintenance cost.

Description

Apparatus for embedded network termination in simple private exchange}

The present invention relates to a network terminal (NT) or terminal for an ISDN (Integrated Service Digital Network) connected to an exchange. In particular, a terminal adapter is not used because a terminal adapter (TA) is not used for a matching connection. The present invention relates to a network terminal device capable of eliminating the inconvenience of having to purchase the terminal and reducing the corresponding cost.

In general, a private automatic branch exchange (PABX) is installed in a place of public office, company, factory, etc. by itself to enable the extension of the extension phone and the telephone line by the telephone station to be connected to each other. Is a device that performs switching for communication line connection between a trunk line and an extension station as well as a communication path of a communication line. There is an ISDN function capable of transmitting a terminal, which is suitable for transmitting and receiving voice signals and data signals as described above, is called an ISDN network terminal (NT) or a terminal.

1 is a block diagram of a conventional switch and terminal connection function.

1, reference numeral 11 denotes an ISDN switch, 12 denotes a first network terminal (NT1) or a terminal adapter (TA), and 13 denotes a second network terminal NT2. Or an ISDN terminal, 14 is a U port of a two-wire connection system, 15 is an S port of a four wire connection, 16 is a T port of a four wire connection, and 17 is a power supply unit.

As shown in FIG. 1, a 2B1Q (2 Binary 1 Quarternary) system U line of two-wire connection is connected to the U port 14 of the NT1 12 from the switch 11, and the S port 15 of the NT1 12 is connected. Is connected to the T port 16 of NT2 (13), which is an AMI (Alternative Mark Inversion) transmission type ISDN terminal, by connecting the U interface to the S / T interface. NT1 (12), which converts to interface, must be installed at the front for operation. In addition, the NT1 12 requires a power supply unit 17.

Here, U, S, T means general ports in ISDN network configuration, and S and T use AMI method.

FIG. 2 is a detailed block diagram of the connection between NT1 and NT2 in FIG.

Referring to FIG. 2, reference numeral 21 denotes an S port of NT1 (12), 23 and 29 are transformers of NT1 and NT2, and 22 and 30 are secondary protection elements and transmission / reception connection of the NT1 and NT2 transformers. 24 and 28 are the primary protection elements of the NT1 and NT2 transformers, 25 and 27 are 8 pin modular jacks of NT1 and NT2, and 26 are 8 pin cables.

Referring to FIG. 2, the S / T ports are separated by transformers 23 and 29 on the primary and secondary sides, and are composed of primary and secondary protection elements, transmission and reception connection elements, and the like. It is connected to an 8-pin line cord or cable 26 through jacks 25 and 27.

Referring to the operation of the prior art in more detail as follows.

First, the ISDN switch 11 of FIG. 1 services an ISDN information channel 2B + 1D as a U interface, which is output at 160Kbps speed and 2-wire connection of a 2B1Q transmission method and delivered to a subscriber.

As described above, the signal output from the exchange 11 is connected to the U port 14 of the NT1 or TA 12, and the NT1 or TA 12 analyzes the signal input from the exchange 11 in the 2B1Q manner. As shown in Fig. 2, the input and output are separated and the T port modular jack 27 of the NT2 13 through the modular jack 25 and the 8-pin cable 26 in the AMI transmission method using a 4-wire connection 192 Kbps transmission speed. Is connected to. This signal is connected to and operated by the transmission / reception terminal of the S / T transceiver IC (Integrated Circuit) of the NT2 13 via the protection elements 28 and 30 and the transformer 29.

In the prior art as described above, an ISDN switch (PABX) outputs or inputs a signal through a U connection that is a two-wire connection method, and a terminal inputs or outputs a signal by an AMI connection method that is a four wire connection method. There was a problem in that a device for matching between terminals is necessary. A terminal adapter (TA) for matching between an exchange and a terminal as described above connects a switch and a 2B1Q 2-wire connection method through a U port, and connects 4-wire. In order to be connected to the terminal through the S port which converts to the AMI method and performs the reverse conversion, and is connected to the T port of the terminal through the S port, the exchange and the terminal can communicate. Since the terminal connected to the port cannot connect directly to the exchange connected through the U line, the terminal must be purchased separately and installed NT1 or TA between the exchange. Barbarism and power, as well as do a separate connection, maintenance is complicated there is a problem that enter the additional installation costs.

Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to use an ISDN exchanger and an ISDN terminal by using a conventional network terminal or a terminal adapter. The built-in terminal adapter function simplifies the connection to the exchange and enables both S / T access network terminals and U access network terminals to use the same software, eliminating the inconvenience of having to purchase a terminal adapter separately. It is to provide a built-in network terminal device of a simple private exchange that can reduce the cost.

In order to achieve the above object, the built-in network terminal device of a simple private exchange according to the present invention,

An ISD terminal for data communication, comprising: a U port for connecting to a two-wire U line by a 2B1Q transmission method of an exchanger; A U / S transceiver for processing a 2B1Q signal input through the U port and converting the signal into a 2B + 1D signal and connecting with an AMI transmission method to perform a U / S interface, and the S of the U / S transceiver A technical feature of the present invention is that the S / T transceiver has a T port connected to the port and performs an S / T interface.

1 is a block diagram of a conventional exchange and terminal connection function;

2 is a detailed block diagram of the connection between NT1 and NT2 in FIG.

3 is a functional block diagram of a built-in network terminal device of a simple private exchange according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

40: switchboard 50: built-in network terminal

51: U port 52: S port

53: T port C: capacitor

R: resistance

Hereinafter, with reference to the accompanying drawings, a built-in network terminal device of a simple private exchange according to the present invention will be described as follows.

3 is a functional block diagram of a built-in network terminal device of a simple private exchange according to an embodiment of the present invention.

Referring to FIG. 3, the UDN port 51 connected to the simple private exchange 40 for ISDN and the U line of the two-wire 2B1Q transmission system and the signal input from the U port 51 to 2B1Q are processed. A U / S transceiver (51) (52) for converting into an information channel signal of 2B + 1D and transmitting to an S / T interface by an AMI method to perform a U / S interface; The embedded network terminal 50 includes an S / T transceiver 53 which is connected to the S port 52 of the U / S transceiver and has a T port for transmitting and receiving signals to perform an S / T interface.

Between the U / S transceivers 51 and 52 and the S / T transceiver 53 constituting the built-in network terminal 50 of the simple private exchange, the DC component generated between each transmitting terminal and the receiving terminal is blocked. A plurality of capacitors C1 to C4; It is connected via a plurality of resistors R1 to R4 holding the reference voltages of the respective transmitting terminals and the receiving terminal.

Referring to the attached network terminal device of a simple private exchange according to the present invention configured as described above with reference to the accompanying drawings as follows.

First, the present invention will be briefly described, in which the attached NT1 or TA 12 of FIG. 1 is built into the NT2 13 device, which is a terminal, and a detailed functional configuration is as shown in FIG.

One aspect of the present invention is to use the S / T interface IC used in the conventional terminal NT2 (13) as it is. The built-in network terminal 50 according to the present invention is connected through the switch 40 and the U port 51, and is connected to the U port 51 that performs the U interface using an IC capable of S connection as it is in the conventional configuration. The S interface side is connected to the T port in the terminal board. Capacitors C1 and C2 are used to cut off the DC component generated by the transmitting side of S and the receiving side of T. Similarly, the DC component is cut off by connecting the receiving side of S and the transmitting side of T to C3 and C4.

In this case, the resistors R1 to R4 are used to maintain the reference voltages between the transmitting and receiving ends, respectively.

This operation of the present invention will be described in more detail.

The built-in network terminal device of the simple private exchange according to the present invention is connected to the U port 51 of the U / S transceivers 51 and 52 through the ISDN switch 40 and the U line of the 160Kbps transmission rate and the 2-wire 2B1Q transmission scheme. And the S port 52 of the U / S transceiver processes the signal transmitted to 2B1Q and converts it into an information channel signal of 2B + 1D, and converts the converted signal into an AMI transmission method using an S / T interface. / T transmits to the transceiver (53) at 192Kbps transmission rate.

In the conventional case, the signal output from the switch 11 is transmitted to the terminal NT2 13 through a line code via a protection element and a transformer, whereas in the present invention, the terminal adapter is incorporated in the terminal NT2. In the circuit board, the transmitting terminal of the S port 52 is directly connected to the receiving terminal of the T port 53, and the transmitting terminal of the T port is directly connected to the receiving terminal of the S port 52.

The C1 to C4 are for blocking the DC component when connecting each transmitting terminal and the receiving terminal, R1 to R4 is to maintain or match the reference voltage of each of the transmitting terminal and the receiving terminal.

As described above, the present invention simplifies the connection with the exchanger by embedding the terminal adapter in the network terminal, which is an ISDN terminal, and can operate the conventional S / T connection terminal and the U connection terminal of the present invention with the same software.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the built-in network terminal device of the simple private exchange according to the present invention has a built-in NT1 in NT2 to directly connect the two-wire U interface line of the exchange, so that the installation is simple and easy, and NT1 and NT2 are When connected with an 8-pin module and a cable, the signal reliability can be improved by eliminating phenomena such as noise disturbances caused by the connection environment.

In addition, since the present invention does not use a separate terminal adapter from a user's point of view, the present invention not only reduces facility and maintenance costs, but also uses terminal software that has already been developed using an S / T interface.

Claims (2)

In the dies terminal of data communication, A U port for connecting with a two-wire U line by a 2B1Q transmission method of the exchange; A U / S transceiver for processing a 2B1Q signal input through the U port, converting the signal into a 2B + 1D signal, and an S port connecting with an AMI transmission method to perform a U / S interface; And a S / T transceiver having a T port connected to an S port of the U / S transceiver to perform an S / T interface. The method of claim 1, wherein the U / S transceiver and the S / T transceiver, A plurality of capacitors for blocking DC components occurring in a transmission terminal and a receiving terminal connection between the U / S transceiver and the S / T transceiver; And a plurality of resistors for holding the reference voltages between the transmitting terminal and the receiving terminal between the U / S transceiver and the S / T transceiver.