KR100251782B1 - Subscriber interfacing circuits and its testing method in isdn - Google Patents

Abstract

PURPOSE: An ISDN(Integrated Services Digital Network) subscriber interface circuit is provided to decide whether each connector is normally operated without using a special counter or a testing device, so as to reduce the testing cost. CONSTITUTION: Many connectors(100-400) install the first port and the second port, respectively. A TX FIFO(Transmitting First-In First-Out)(50) and an RX(Receiving) FIFO(40) temporarily store transceiving data between each connectors(100-400) and upper modules. If a testing message is received from the upper modules and stored in the RX FIFP(40), a CPU(Central Processing Unit)(10) activates a physical layer between the first port and the second port of a connector corresponding to the received testing message in the many connectors(100-400), and transceives the testing message through each port, then decides whether each port is normal.

Description

Integrated Telecommunication Network Subscriber Interface Circuit with Self-diagnosis Function and its Diagnosis Method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber station circuit and a method for diagnosing the subscriber network circuit, and more particularly, to a subscriber interface circuit having its own diagnostic function and a diagnosis method thereof.

Early national exchanges, private exchanges, or key-phone systems (hereinafter referred to as "exchange systems") were implemented only in connection with public switched telephone networks (PSTNs). However, with the development of technology, the ISDN (Integrated Services Digital Network) has been proposed, and nowadays, the exchange system is being implemented and used in the form of being connected to not only the PSTN but also the ISDN. That is, these days, the switching system includes not only an interface circuit for accommodating PSTN subscribers but also an interface circuit for acquiring ISDN subscribers (hereinafter referred to as "ISDN subscriber interface circuit").

On the other hand, in order to diagnose whether the subscriber interface circuit of the switching system is operating normally, or more specifically, whether or not each subscriber port provided in the subscriber interface circuit is normally connected, a separate measuring device or a diagnostic device is provided outside the switching system. This device must be used after connection. As described above, in order to diagnose whether the subscriber interface circuit of the exchange system is normal, a separate device is required, and thus there is a problem in that its operating cost increases in operating the exchange system. In addition, in order to perform the diagnosis, it is troublesome to connect the diagnosis apparatus to the subscriber port to which the subscriber interface circuit is desired during the operation of the switching system.

Accordingly, an object of the present invention is to provide an ISDN subscriber interface circuit and a diagnostic method thereof having a function of diagnosing whether each subscriber port of an exchange system is normal without using a separate diagnosis device.

Another object of the present invention is to provide an ISDN subscriber interface circuit and a method for diagnosing the same, which reduce the diagnostic cost required for operating the switching system.

It is still another object of the present invention to provide an ISDN subscriber interface circuit and a method for diagnosing the same, which eliminates the trouble in diagnosing whether each subscriber port of the switching system is normal.

In order to achieve these objects, the present invention provides an ISDN subscriber interface circuit comprising a plurality of connections each having a first port and a second port. After setting the first port of one connection to the network mode, and setting the second port to the subscriber mode, activating the physical layer between these ports and determining whether each port is operating normally according to whether messages are normally transmitted or received between them. It features.

As described above, since the ISDN subscriber interface circuit can perform a diagnosis function on its own, there is no need to pay a separate cost for the diagnosis, and it has the effect of eliminating the trouble of installing an apparatus for diagnosis.

1 is a diagram showing the configuration of a subscriber station circuit for an integrated telecommunication network to which the present invention is applied;

2 is a diagram showing the configuration of a general information network subscriber interface circuit having a self-diagnostic function according to the present invention;

3A and 3B are diagrams showing a processing flow for a self-diagnostic operation of a general information network subscriber interface circuit according to the present invention.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, 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 terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or chip designer, and the definitions should be made based on the contents throughout the present specification.

1 is a view showing a connection configuration for the ISDN subscriber interface circuit of the switching system to which the present invention is applied.

In FIG. 1, the first to fourth connection units 100, 200, 300, and 400 each have two ports to accommodate one ISDN subscriber per port. In the case of the first connection part 100, the ports 0 and 1 are provided. In the case of the second connection part 200, the ports 2 and 3 are provided. In the case of the third connection part 300, the ports 4 and 5 are provided. In the case of the connection part 400, the ports 6 and 7 are provided. At this time, each connection portion has the same structure, and is configured as shown in Figure 2 to be described later.

The RX FIFO 40 and the TX FIFO 50 are for connection between the upper module and the ISDN subscriber interface circuit, and temporarily store data transmitted and received between the upper module and the ISDN subscriber interface circuit. The buffers 60 and 70 are Pulse Code Modulation (PCM) highway access buffers that buffer PCM data (PCM RX HWY) received from the highway and PCM data (PCM TX HWY) to be transmitted on the highway.

The central processing unit (CPU) 10 is for controlling the overall operation of the ISDN subscriber interface circuit. The central processing unit (CPU) 10 receives data from the upper module and stores the data stored in the RX FIFO 40 through the CPU bus. The data to be sent is transmitted to the TX FIFO 50 via the CPU bus. In particular, the CPU 10 controls the operation of diagnosing a corresponding port of any one of a plurality of connections by receiving a diagnostic message from the upper module during the operation according to the present invention. Read Only Memory (ROM) 20 stores a program according to a processing flow for performing an ISDN subscriber interface circuit diagnostic operation according to the present invention as shown in FIG. Random Access Memory (RAM) 30 temporarily stores data that is controlled and processed by the CPU 10.

Referring to FIG. 2, the first connection unit 100 illustrated in FIG. 1 includes a high level data link control (HDLC) controller 0, 1 110, 120, an ISDN transceiver 0, 1 130, 140, and transformers TO1, T02, T11, and T12. And the switches S1 to S12. The HDLC controller 0 110, the ISDN transceiver 0 130, the transformers TO1, T02, and the switches S1, S2, S5 to S8 are for connection with the port 0. In contrast, the HDLC controller 1 120, the ISDN transceiver 1 140, the transformers T11 and T12, and the switches S3, S4, S9 to S12 are connected to the port 1. The transmission ports TX0 +, TX0- and the reception ports RX0 +, RX0- of the port 0 are connected to the transformer T01 and the transformer T02, respectively. -) And receiving ports (RX1 +, RX1-) are connected respectively.

Among the components shown in FIG. 2, the HDLC controllers 110 and 120, the ISDN transceivers 130 and 140, and the transformers T01, T02, T11, and T12 constitute components of a known ISDN subscriber interface circuit. ISDN subscriber interface circuit according to the present invention is characterized by including the switches S1 to S12 that can be implemented as a relay in addition to the above known components. Each switch has two contacts and the switching operation is controlled by the CPU 10 shown in FIG. The first switch S1 is responsible for supplying the operating power (40V) to the transformer T01, the second switch S2 is responsible for supplying the operating power to the transformer T02, the third switch S3 is to supply the operating power to the transformer T11. The fourth switch S4 plays a role of supplying operating power to the transformer T12. The fifth switch S5 and the sixth switch S6 are connected between the transmission ports TX0 +, TX0- of the port 0 and the transformer T01. The seventh switch S7 and the eighth switch S8 are connected between the reception ports RX0 +, RX0- of the port 0 and the transformer T02. The ninth switch S9 and the tenth switch S10 are connected between the transmission ports TX1 +, TX1- of the port 1 and the transformer T11. The eleventh switch S11 and the twelfth switch S12 are connected between the reception ports RX1 +, RX1- of the port 1 and the transformer T12.

In the normal operation, each of the ports 0 to 7 is controlled by the CPU 10 and connected in a solid line as shown in FIG. 2 to serve as an ISDN subscriber terminal access port. In contrast, in the case of the diagnostic operation, any one of the ports 0 to 7 is controlled by the CPU 10 and connected by a dotted line as shown in FIG. 2 to serve as a self diagnostic port. For example, if the upper module receives a "Port X (X = 0, ..., 7) diagnostics" message via RX FIFO 40, CPU 10 connects port X + 1 to port X if X is even. If X is odd, then port X-1 is connected to port X. Therefore, assuming that the upper module receives a "Port 0 Diagnostics" message via RX FIFO 40, port 1 is connected to Port 0. Assuming that a "Port 3 Diagnostics" message is received, port 2 is connected to Port 3.

3A and 3B illustrate a processing flow for a self-diagnostic operation of an ISDN subscriber interface circuit according to the present invention. This diagnostic operation is controlled and performed by the CPU 10 of FIG. 1 as described above.

Now, assuming that the "Port 0-1 diagnosis" message is received from the upper module, the CPU 10 checks this in step 301 of FIG. 3A and then switches off the first to fourth switches S1 to S4 in step 302. In this case, the switching off means that each port is connected as a dotted line as shown in FIG. After performing step 302, the CPU 10 sets the port 0 to the ISDN network mode in step 303, sets the port 1 as the ISDN subscriber mode, and controls the fifth to twelfth switches S5 to S12 in step 304. Port 0 and Port 1 are connected to each other and the physical layer between Port 0 and Port 1 is activated in step 305. Here, connecting the port 0 and the port 1 with each other means that the fifth to twelfth switches S5 to S12 are connected in a dotted line. Accordingly, the transmission ports TX0 + and TX0- of the port 0 are connected to the reception ports RX1 + and RX1- of the port 1, and the transmission ports TX1 + and TX1- of the port 1 are connected to the reception ports RX0 + and RX0- of the port 0. do.

After performing step 305, the CPU 10 transmits the message MSG0 to the HDLC controller 0 110 through the CPU bus in step 306, and determines whether the transmitted message MSG0 is received by the HDLC controller 1 120. In this case, if the ports 0 and 1 are normally connected, the transmission message MSG0 will be received by the HDLC controller 1 120 through the ISDN transceiver 0 110 → transformer T01 → transformer T12 → ISDN transceiver 1 140. Therefore, if the transmission message MSG0 is not received by the HDLC control unit 1 120, it is determined that the ports 0 and 1 are abnormal, and the resulting message "Port 0, 1 abnormal" message is transmitted to the upper module through the TX FIFO 50. .

On the other hand, when the transmission message MSG0 is received by the HDLC control unit 1 120, it is again determined whether ports 0 and 1 are normally connected. In step 308, the CPU 10 changes the path to transmit the message MSG1 to the HDLC controller 1 120, and in step 309, the CPU 10 determines whether the transmission message MSG1 is normally received by the HDLC controller 0 110. In this case, if the ports 0 and 1 are normally connected, the transmission message MSG1 will be received by the HDLC controller 0 110 via ISDN transceiver 1 140 → transformer T11 → transformer T02 → ISDN transceiver 0 130. If the transmission message MSG1 is normally received by the HDLC controller 0 110, the CPU 10 determines that the ports 0 and 1 are normally connected at 310, and according to the result of the determination, the "port 0,1 normal" message is higher through the TX FIFO 50. Send to the module.

After determining whether the ports 0 and 1 are normally connected by performing the above self-diagnosis operation, the ports 0 and 1 are released from the self-diagnosis state. In this operation, the CPU 10 deactivates the physical layer between the port 0 and the port 1 in step 312 of FIG. 3B, and switches on the states of the fifth to twelfth switches S5 to S12 in step 313 to connect the port between the port 0 and the port 1. Release it. Here, switching on the states of the fifth to twelfth switches S5 to S12 indicates that each of them is connected in a dotted line. After the release operation of the self-diagnosis state, the CPU 10 sets port 0,1 as the ISDN subscriber access port. That is, in step 314, the CPU 10 sets each of the ports 0 and 1 as the ISDN network mode, and in step 315, the first switch to the fourth switch is switched on so that the operating power is applied to each transformer T01, T02, T11, and T12. do. That is, the ISDN subscriber interface circuit is brought into a state of normal operation.

As described above, each connection included in the ISDN subscriber interface circuit according to the present invention is provided with two ports. The present invention focuses on the fact that two ports are provided in the connection unit, and thus, one port is set in the ISDN network mode and the other port is set in the ISDN subscriber mode so that the operation of determining whether the connection is normal can be performed. do. That is, in the normal operation, the ISDN subscriber interface circuit allows the ISDN network (highway of the switching system) to be connected between the ISDN subscriber. However, in case of self-diagnosis operation, one port of the connection part of the ISDN subscriber interface circuit is connected to the ISDN network, and the other port is connected as if the ISDN subscriber is connected, and then it is determined whether the connection operation between them is normal. For this operation, each port of the connection portion of the ISDN subscriber interface circuit according to the present invention is provided with relays which can be switched in accordance with the operation mode.

As described above, the present invention can determine whether each connection part of the ISDN subscriber interface circuit operates normally without using a separate measuring device or a diagnostic device. Accordingly, there is an advantage that can reduce the diagnostic cost required in operating the switching system including the ISDN subscriber interface circuit. In addition, there is an advantage of eliminating the need to install a separate device to diagnose whether each subscriber port is normal.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims (5)

In the integrated information communication network (ISDN) subscriber interface circuit of the switching system, A plurality of connections each having at least a first port and a second port, A first-in first-out memory and a first-in first-out memory for temporarily storing data transmitted and received between the respective connection units and the upper module; When a diagnostic message from the upper module is received and stored in the first-in, first-out memory, each of the plurality of connections activates a physical layer between the first port and the second port of the connection corresponding to the received diagnostic message. And a central processing unit for transmitting and receiving messages through a port and determining whether each port of the connection unit is normal. The method of claim 1, wherein each of the first port and the second port of the plurality of connections comprises a port for transmitting and a port for receiving, When the central processing unit receives the diagnostic message from the upper module, it connects the transmission port of the first port and the receiving port of the second port and checks whether the transmission and reception of messages through these ports is normally performed, And then connecting the transmitting port of the second port with the receiving port of the first port and confirming whether transmission and reception of messages through these ports is normally performed. The method of claim 2, wherein the connection between the transmission port of the first port and the reception port of the second port and the connection between the transmission port of the second port and the reception port of the first port are made through a relay. These relays are self-diagnostic function, characterized in that the switching is controlled by the central processing unit. In a self-diagnostic method of an integrated subscriber network circuit (ISDN) subscriber interface circuit comprising a plurality of connections each having a first port and a second port, In the self-diagnosis operation, the first port of one of the plurality of connections is set to the network mode, the second port is set to the subscriber mode, the physical layer between the ports is activated, and whether messages are normally transmitted or received between them. The diagnostic method, characterized in that for determining whether each port is operating normally. The method of claim 4, wherein each of the first port and the second port comprises a transmission port and a reception port, Whether the message transmitted through the transmission port of the first port is received by the reception port of the second port, and the message transmitted through the transmission port of the second port is the reception port of the first port. And determining whether the first port and the second port operate normally according to whether or not the signal is received.

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