KR100283168B1 - Method for testing a normal operation status of analog interface in pbx - Google Patents

Abstract

The present invention relates to a method of checking whether an analog interface (B) channel operates in a private exchange, and in particular, an analog interface through a state in which a digit transmitted from a DTMF generator provided in a private exchange is received in a DTMF receiver. It is to check the normal operation of B channel. The present invention detects a port that is not in a busy state of the analog interface at the time when the volume of the call is the smallest in the private exchange, and connects the DTMF generator to the transmitting end of the detected port and the DTMF receiver to the receiving end of the corresponding port. Switch. The DTMF generator may be controlled to transmit a predetermined digit to detect whether a DTMF signal corresponding to the same digit as the transmitted digit is received by the DTMF receiver to determine whether the B channel forming a voice call path is operating normally. .

Description

How to check whether analog interface is normal in private exchange {METHOD FOR TESTING A NORMAL OPERATION STATUS OF ANALOG INTERFACE IN PBX}

The present invention relates to a method of checking the operation of a B-channel of an analog interface in a private exchange. In particular, the digit transmitted from the DTMF generator provided in the private exchange is received through the DTMF receiver. The present invention relates to a method for checking whether an analog interface is normally operated in a private exchange that verifies whether the B channel is normally operated.

The analog interface of a conventional private exchange is largely equipped with an analog subscriber line interface (SLI) and an analog trunk interface (Trunk; TRK), so that the exchange service can be used through a general telephone. Do. Therefore, the analog subscriber line or trunk interface is periodically tested to maintain normal operation. In particular, testing whether or not the normal operation of the B channel forming the voice call path through the analog interface is essential to the operation of the private exchange. It is a necessary work.

However, in the conventional private exchange, in order to test the normal operation of the analog interface, a method of testing whether the normal operation is performed by connecting a separate measuring device to the analog subscriber line or trunk interface to the outside or a ring provided in the analog interface is performed. Jumping was performed at the (Ring) end and the Tip end to test the normal operation.

1 and 2 are diagrams illustrating a method for testing whether a conventional analog subscriber line or trunk interface unit operates normally, and FIG. 1 illustrates a subscriber line interface unit (SLI) 110 and an analog trunk interface unit (TRK) 120. This is a view showing the operation of taking a jumper (Jumpering), which is a method of connecting a separate conductive line to the tip and ring terminals between the terminals. That is, as illustrated in FIG. 1, in the related art, a digit (DIGIT) sent from the DTMF generator 112 by jumpering a tip and a ring terminal through a separate wire is left in the DTMF receiver 122 as it is. The main control unit 130 checks whether or not the reception operation is performed to confirm whether the B channel, which is a channel of the corresponding analog interface, is normally operated.

In addition, in addition to the method illustrated in FIG. 1, a method of confirming an operating state of an analog subscriber line or trunk interface unit by connecting a separate measurement device to the outside is conventionally used, which is illustrated in FIG. 2. Is shown.

Referring to FIG. 2, the DTMF generator 212 is connected to the measurement equipment 240 manufactured separately from the tip and ring terminals of the analog subscriber line interface (SLI) 210 and the analog trunk interface (TRK) 220. Through the digit transmission and reception state between the DTMF receiver and 222, the operator checks whether the B channel, which is a channel of the analog interface, is in a normal operating state.

However, the above-described conventional test methods have an inconvenience in that an operator must manually install a separate jumper from the outside or check the operation state with a separate measuring device. In other words, connecting external equipment to the tip and ring terminals of the analog interface to be tested brought a lot of inconvenience. Besides. If the private exchange system is operating on-line, it is impossible to check the operating state of the analog interface by the conventional test method as described above. Occurred.

Accordingly, an object of the present invention is to solve the problems caused by the conventional method for testing the operating state of the analog subscriber line interface unit and the analog trunk interface unit, that is, a separate hardware device (such as a jumper) or measurement equipment is required and the exchange system operates. It is to provide a method to solve the problem of limitation of test time which cannot be tested in the state.

Another object of the present invention is to provide a method for confirming normal operation of a B channel of an analog interface using a DTMF generator and a DTMF receiver provided in an existing private exchange.

In order to achieve these objects, the present invention provides a process of determining a time when the call volume is the least, and when it is determined that the time is the least, the process of detecting a port that is not a busy state of the analog interface; Switching a DTMF generator at a transmitting end of the detected port and switching a DTMF receiver at a receiving end of the corresponding port, transmitting a predetermined digit by controlling the DTMF generator, and a DTMF signal corresponding to the same digit as the transmitted digit The present invention proposes a method comprising the step of detecting whether the DTMF receiver is received. Accordingly, the B channel forming the voice call path can be checked through the analog interface of the private exchange.

1 is a view showing a test state for confirming the normal operation of the analog interface in a conventional private exchange.

Figure 2 is a view showing another embodiment of a test state for confirming the normal operation of the analog interface in the conventional private exchange.

3 is a view showing a test state for confirming whether or not the normal operation of the analog interface in the private exchange according to the present invention.

4 shows a concrete internal circuit diagram of an analog interface according to the invention.

5 is a flowchart illustrating a method for confirming whether an analog interface is in normal operation according to the present invention;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the description of the components already known or implemented in the same may be omitted since it may obscure the subject matter of the present invention.

DETAILED DESCRIPTION Hereinafter, a detailed description of the present invention will be described with reference to FIGS. 3, 4, and 5.

First, FIG. 3 is a view showing a test state for confirming whether the analog subscriber line interface unit (SLI) 210 and the analog trunk interface unit (TRK) 220 are normally operated in a private exchange according to the present invention. 4 is a diagram illustrating a specific internal circuit diagram of the analog subscriber line interface unit (SLI) 210 and the analog trunk interface unit (TRK) 220 according to the present invention. 5 is a flowchart illustrating a method for confirming whether the analog subscriber line interface unit (SLI) 210 and the analog trunk interface unit (TRK) 220 are normally operated according to the present invention.

The present invention is described below with reference to the drawings.

3 and 4, analog interfaces of the analog subscriber line interface unit (SLI) 210 and the analog trunk interface unit (TRK) 220 generally have separate codecs 414 therein. ). The codec 414 converts an input analog signal into a digital PCM bit stream and transmits it to the main control module 230, or converts the PCM bit stream back into an analog signal. do. At this time, the converted digital PCM bit stream is transmitted through a transmission data Tx path and a reception data Rx path separated by a hybrid. That is, since the analog signal is a signal having a form in which both directions exist, the line interface card 310 should be provided with a separate Tx / Rx separation circuit implemented as a hybrid, an embodiment of which is shown in FIG. have.

That is, Figure 4 is a view showing a specific internal circuit diagram of the analog subscriber line interface (SLI) 210 and analog trunk interface (TRK) 220 according to the present invention, from the lightning or induced voltage AC short circuit on the subscriber line It is composed of a protection circuit to protect the subscriber circuit and the main system, a DC By Path circuit to detect a ring signal and a hook-off switch signal, a balance circuit 412, and a codec 414. . The Tx / Rx separation circuit operates according to an impedance connected to a tip and a ring terminal. That is, Tx and Rx are almost completely separated at their impedance. This is commonly referred to as impedance matching.

However, in the normal operation state, not the busy state, the analog subscriber line interface unit 210 is in a hook-on state, so the DC and AC impedances become infinite, and the analog trunk interface unit (TRK) 220 In addition, since the loop relay is open, the impedance becomes infinite. Therefore, the impedance match circuit almost loses its function, and almost 90% or more of the Tx Voice B Channel Data (which is a typical result value from the experimental value) Rx It is supposed to return to Dan. This operation is operated through the circuit shown in FIG. 4, and the present invention can be implemented through this operation phenomenon, that is, an operation of returning to the Rx stage where Tx voice B channel data returns 90% or more.

Accordingly, referring to FIG. 5, the operation for checking whether the analog interface according to the present invention is normally operated on the basis of the above-described operation phenomenon is described first. The time is determined by the main control module 230. This is because the most spare port is left in the call of the analog interface at the time when the call volume is the smallest, and it provides an environment in which the normal operation of the analog interface can be tested without disrupting the normal exchange operation. In addition, the call volume determination operation is performed through a separate call volume statistics program, and the program has a function of statistically calculating time data related to the call volume at the private exchange and reading the least amount of call volume time through the result. Next, when the call amount is the smallest, the port is detected in step 514 that is not in a busy state of the analog interface, and the DTMF generator 212 is connected to the transmitting end of the port detected in step 516. This connection operation is operated by providing a separate line switching circuit between the DTMF generator 212, the analog subscriber line interface unit (SLI) 210, and the analog trunk interface unit (TRK) 220. When the connection is completed by the operation of the switching circuit, the DTMF receiver 222 is connected to the receiving terminal of the corresponding port connected in step 518 through the same operation as the switching circuit.

As a result, the DTMF generator 212 is connected to the transmitting end of the corresponding port, and the DTMF receiver 222 is connected to the receiving end. When the connection operation is completed, the DTMF signal is generated in the DTMF generator 212 in step 520 and the corresponding digit is transmitted to the analog subscriber line interface (SLI) 210 and the analog trunk interface through the transmitter. It is drawn into the part (TRK) 220. Then, the transmitted digit is output to the DTMF receiver 222 connected to the receiving end by the operation phenomenon previously described, that is, the operation phenomenon in which Tx voice B channel data returns to the Rx end by 90% or more. As a result, the DTMF receiver 222 receives the digits transmitted from the DTMF generator 212.

Therefore, in step 522, the DTMF generator 212 determines whether or not the digit transmitted from the receiver can test whether the B channel is normal. That is, when it is determined that the transmitted digit is received as it is in the DTMF receiver 222, the analog subscriber line interface (SLI) 210 and the analog trunk interface (TRK) 220 are normal in step 424. If it is determined that the transmitted digits are not directly received by the DTMF receiver 222 as it is, the operation state is recognized as abnormal in step 523. It will perform an operation to inform the operator. On the other hand, the transmission and reception path of the digits transmitted between the DTMF generator 212 and the DTMF receiver 222, that is, the communication path is made through the path switched by the time switch (T-S / W) 323.

The operation of the present invention described with reference to FIG. 5 will be described below with reference to specific circuit diagrams of the analog subscriber line interface unit (SLI) 210 and the analog trunk interface unit (TRK) 220 shown in FIG. 4. do.

Meanwhile, the specific circuit diagrams of the analog subscriber line interface (SLI) 210 and the analog trunk interface (TRK) 220 in FIG. 4 are the most commonly used 2W-4W, 4W-2W balance circuits. It is a circuit diagram which shows the circuit diagram of the line interface card provided with.

First, an analog signal converted by D / A from a codec 414 is introduced into a balance logic unit 412 through an operational amplifier U3 421 and then transferred to a transformer T1. By the tip (Tip), it is output to the ring (Ring) end. In this case, when a predetermined proper impedance matching is performed at the tip and ring ends, the Rx signal is transmitted to the tip and ring ends without returning to the Tx end. However, the tip above. When the ring end is open, an example of this is because the loop relay of the analog trunk interface (TRK) 220 is turned off or the hook switch of the analog subscriber line interface (SLI) 210 is turned off. Since it becomes infinity, the matching circuit is out of balance. Therefore, all signals that are Rx return to the Tx stage. In this case, as shown in FIG. 3, the DTMF generator 212 is connected to the Tx stage and the DTMF receiver 222 is connected to the Rx stage to detect the transmitted and transmitted digit so that the DTMF generator 212 and the DTMF generator 212 and the transmitted digit are detected correctly. The DTMF receiver 222, the codec 414, the operational amplifier 421, the balance circuit 412, and the transformer T1 can be determined. That is, the overall abnormality of the analog subscriber line interface unit (SLI) 210 and the analog trunk interface unit (TRK) 220 can be tested.

According to the circuit operation as described above, the operation of FIG. 5 is performed, and thus, the test of the line interface card according to the present invention is possible.

In conclusion, it is possible to test the normality of the B channel through the call of the line interface, that is, the analog interface, without external factors such as the test by using external measuring equipment and the test using a jumper, which was possible only offline.

Meanwhile, in the detailed description of the present invention, the DTMF generator 212 and the DTMF receiver 222 are used to test whether the line interface card is normally operated through the reception of the digits transmitted by the DTMF generator 212. It is possible to implement the present invention by replacing with a tone generator and replacing the DTMF receiver 222 with a tone receiver. In this case, it is possible to know whether the line interface card is in a normal state through whether the tone generated by the tone generator and transmitted by the tone generator is received by the tone receiver as it is.

In the description of the present invention shown in FIG. 5, a method of checking whether a B channel is normally operated by detecting a port in a line interface card is shown, but the present invention is based on a predetermined priority. The port of the interface card is detected, and if the detected port is not in a busy state, the same operation as in FIG. 5 is repeated. That is, a line interface card having a plurality of ports sequentially detects ports that are not in a busy state at a time when the volume of communication is the smallest, and then performs the operation of FIG. 5 corresponding to each port. At this time, the port selection is performed by the above-described switching operation of the line switch.

As described above, the present invention has the advantage that even if the private exchange system is operating on-line, the port which is not in use is automatically tested to quickly find out whether there is an abnormality in the call, and at the same time, Since the use test operation is performed, there is an advantage that does not affect the call operation performed in the private exchange.

In addition, the present invention has many advantages in terms of convenience, such as reducing the test cost by implementing a test method using the operating characteristics of the balance circuit provided in the existing line interface card without adding a separate device.

Claims (2)

The analog subscriber line interface unit (SLI) 210 and the analog trunk interface unit (TRK) in a private exchange having a DTMF generator 212, a DTMF receiver 222, a measuring device 240, and a main control module 230 ( In the method for checking the B channel operating state of the analog interface implemented in (220), A first process of determining, by the main control module 230, a time when the call amount is the smallest; A second time for detecting a port that is not in a busy state in the analog subscriber line interface unit (SLI) 210 and the analog trunk interface unit (TRK) 220 when it is determined that the call volume has reached the least amount of time in the first process; Process, A third process of controlling a switching operation such that the DTMF generator 212 is connected to the transmitting end of the port detected in the second process, and the DTMF receiver 222 is connected to the receiving end of the corresponding port; A fourth process of controlling the DTMF generator 212 of the third process to transmit a predetermined digit through the connected port; And a fifth process of detecting whether a DTMF signal corresponding to the same digit as the transmitted digit is received by the DTMF receiver 222 through the port. Way. The method of claim 1, When the fifth process is completed, another port provided in the analog subscriber line interface unit (SLI) 210 and the analog trunk interface unit (TRK) 220 is sequentially detected in a predetermined order, and the detection is performed. If it is determined that the port is not in a busy state, the method further includes repeating the third process through the detected port.