KR100289580B1 - Subscriber Board Simulator for Line Test - Google Patents

Abstract

The present invention provides a power supply (-48V) provided from the exchanger to the subscriber board through the 2-wire (2W) line when connecting between the exchanger and the subscriber board of the optical subscriber system in a 2-wire (2W) method (Tip, Ring). The present invention relates to a subscriber board simulator that simulates a subscriber board for testing.

The present invention is a relay for connecting or disconnecting the two-wire (2W) line to the subscriber board side; A line transformer for blocking high frequencies transmitted through a 2-wire (2W) line; A first hybrid integrated circuit device connected to the transformer for matching impedance; A subscriber line matching unit connected to the first hybrid integrated circuit device to limit loop current of the subscriber line; And a second hybrid integrated circuit device connected to the subscriber line matching unit and matching an input / output signal.

Therefore, according to the present invention, after connecting the exchanger and the optical subscriber system in a 2-wire (2W) manner, whether the power is normally supplied from the exchanger can be easily tested using the simulator board of the present invention without mounting the actual subscriber board. It can be effective.

Description

Subscriber board simulator for line test

The present invention provides a power supply (-48V) provided from the exchanger to the subscriber board through the 2-wire (2W) line when connecting between the exchanger and the subscriber board of the optical subscriber system in a 2-wire (2W) method (Tip, Ring). The present invention relates to a subscriber board simulator that simulates a subscriber board for testing.

In general, the subscriber network serves to connect the subscriber terminal installed in the subscriber's home to the communication network. For general residential subscribers, which are mostly analog voice services, two or four wire copper cable (TP) is used. I'm using it.

Recently, as high-speed data service and video communication service increase with the development of information society, it is necessary to establish broadband subscriber network. As such, subscriber access technology for constructing broadband subscriber network uses existing wired lines. There are ADSL, HDSL, optical subscriber network technology (FTTH or FTTC) using optical cable, and wireless local loop (WLL) for wirelessly providing subscriber lines. Here, the optical subscriber network using the optical cable is widely known as a FLC (Fibre Loop Carrier) system in which a DLC (Digital Loop Carrier) system is developed. The FLC system is an FLC-based system using ATM technology and an optical network unit (ONU). The trend is gradually developing to C.

On the other hand, the subscriber board in the optical subscriber system is connected to the subscriber board in the exchange via a two-wire (2W) line, at which time a -48V voltage is supplied to the transmitter. That is, the exchanger connects -48V and GND to the Tip and Ring lines in order to supply talk current to the subscriber side in the optical subscriber transmission loop.

Therefore, in order to determine whether the -48V power supplied from the exchange to the optical transmission device is normal, a simulator is required to take the appropriate load in place of the subscriber board on the optical subscriber system side. In other words, subscriber boards connected with the exchanger include Subscriber Line Circuit-Exchange (SLC-E), Coin-Phone Central (CP / C), and Dial Pulse Terminating (DPT). If there is a simulator to simulate, the power test will be much easier.

Accordingly, the present invention has been made in order to meet the above necessity, an object of the present invention is to provide a subscriber board simulator that serves as a load in place of the actual subscriber board when the power test of the two-wire (2W) line.

In order to achieve the above object, the apparatus of the present invention, in the device for testing the power supplied through the two-wire (2W) line after connecting the exchanger and the optical subscriber system in a two-wire (2W) method, 2 A relay for connecting or disconnecting the line (2W) line to the subscriber board; A line transformer for blocking high frequencies transmitted through the two-wire (2W) line; A first hybrid integrated circuit device connected to the transformer for matching impedance; A subscriber line matching unit connected to the first hybrid integrated circuit device to limit loop current of a subscriber line; And a second hybrid integrated circuit device connected to the subscriber line matching unit and matching an input / output signal.

1 illustrates an example of a communication network using SLC-T and SLC-E;

2 shows an example of a communication network configuration using CP / R and CP / C;

3 shows an example of a network configuration using DPO and DPT;

4 is a connection example between an exchanger and an optical subscriber system to which the present invention is applied;

5 is a block diagram of a subscriber board simulator according to the present invention.

* Explanation of symbols for main parts of the drawings

410: exchanger 420: lapping terminal

430: Subscriber board of the optical subscriber system 430 ': Subscriber board simulator

431a, 431b: relay 432: transformer

433: first hybrid IC 434: subscriber line matching unit

435: second hybrid IC

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

1 shows an example of a communication network configuration using a subscriber line circuit-T (SLC-T) and an SLC-E. The communication network includes a PCM terminal device (110, 120), a private exchange (130), and a local exchange (140). Each station apparatus 110, 120 is composed of a common unit and subscriber boards 112, 122, the subscriber board is connected to the phone is the SLC-T (112), the subscriber board is connected to the switch is the SLC-E (122). The common unit is connected to the E1 link, and the private exchange unit 130 is connected to the private exchange unit 140. The functions required for such an SLC-T circuit include a function of PCM modulation / demodulation of a two-wire voice signal, a ring signal supplied to the telephone side, and a call current.

2 illustrates an example of a communication network configuration using a coin phone / R (CP / R) and a CP / C. The communication network includes an outgoing trunk circuit (210), a station apparatus (220, 230), and an incoming trunk circuit (ITC). do. In addition, each end station device (220, 230) is connected to the common part E1 link, the subscriber board is divided into CP / R (222) and CP / C (232) is connected to the OTC 210 and ITC 240, respectively. In this case, the CP / C unit 232 is used in connection with an incoming trunk of an electronic switchboard of a two-wire (2W) loop signal method. After converting the signal to the common unit, the digital signal transmitted from the power station must be received from the common unit to control the two-wire (2W) loop to open or occupy, and to filter the analog signal entering through the trunk. It converts the digital signal into the common unit and transfers it to the common unit, demodulating and filtering the digital signal transmitted from the power station, reproducing it as a voice signal, and delivering it to the exchange.

3 is an example of a communication network configuration using DPO (Dial Pulse Originating) and DPT (Dial Pulse Terminating), the communication network is OTC (Outgoing Trunk Circuit: 310), the station devices (320,330), ITC (Incoming Trunk Circuit: 340) It is composed. Each station device (320, 330) is connected to the common part E1 link, subscriber board is divided into DPO (322) and DPT (332) is connected to OTC 310 and ITC (340), respectively. In this case, the DPT 332 is pulse-coded demodulated and demodulated on a two-wire audio signal, and is used for the exchange incoming measurement.

4 is an example of a connection between an exchanger and an optical subscriber system to which the present invention can be applied, and the subscriber board 430 of the exchanger 410 and the optical subscriber system (FLC-B) is connected to a wrapping terminal (420). The line (2W) is shown connected by the line. At this time, 2-wire line is divided into Tip and Ring, and -48V DC and ground (GND) are connected.

5 is a block diagram of a subscriber board simulator according to the present invention. In accordance with the present invention, the subscriber board simulator 430 'simulating the power load characteristics of each of the subscriber boards of the transmission apparatus includes a relay 1 431a, a relay 2 431b, a transformer 432, a first hybrid IC 433, The subscriber line matching unit 434 includes a second hybrid IC 435. Although not shown in the drawing, the power supply state may be easily understood by adding a light emitting diode for indicating that the -48V voltage is normally applied.

5, -48V power is supplied from the exchange through the Tip and Ring lines connected to the exchange 410, and this power is supplied to the transformer 432 via the relay 1 431a and the relay 2 431b. Is entered. The transformer 432 is for blocking high frequency noise introduced through the line, and the first hybrid IC 433 is made of resistors for matching impedance characteristics of the line.

Subscriber line matching unit 434 serves to limit the talk current of the subscriber loop line to a maximum of 60mA. Subscriber line matching unit 434 in the embodiment of the present invention is implemented as a subscriber line interface chip (SLIC), SLIC is a battery feed function, overvoltage protection, ring driving function, signal monitoring function, Perform hybrid and test functions. The second hybrid IC 435 is composed of a resistor and a capacitor to match the input and output signal lines of the SLIC.

The subscriber board simulator configured as described above can be connected to the 2-wire (2W) line instead of the subscriber board to check whether the -48V power provided from the exchanger is normally supplied to the subscriber board side of the optical subscriber system.

As described above, according to the present invention, after connecting the exchanger and the optical subscriber system in a two-wire (2W) manner, whether the power is normally supplied from the exchanger, without using the actual subscriber board, the simulator board of the present invention is used. There is an effect that can be easily tested.

Claims (1)

In the apparatus for testing the power supplied through the 2-wire (2W) line after connecting the exchanger and the optical subscriber system in a 2-wire (2W) method, A relay for connecting or disconnecting a 2-wire (2W) line to the subscriber board; A line transformer for blocking high frequencies transmitted through the two-wire (2W) line; A first hybrid integrated circuit device connected to the transformer for matching impedance; A subscriber line matching unit connected to the first hybrid integrated circuit device to limit loop current of a subscriber line; And And a second hybrid integrated circuit device connected to the subscriber line matching unit for matching an input / output signal.