KR100520636B1 - Method for examining data transmission path in fiber to the home network - Google Patents

Abstract

The present invention provides a method for monitoring the presence or absence of data transmission paths in a Fiber To The Home (FTTH) network supporting broadcast / communication convergence service. To this end, the present invention provides a first process comprising a network management system for monitoring a data transmission path of the FTTH network in an FTTH network supporting broadcast / communication convergence service, and an OLT according to a control signal of the network management system. (Optical Line Terminal) transmits a test signal to the Optical Network Unit (ONU) and confirms the abnormality of the line through the confirmation, and if the abnormality is not confirmed in the first process, the ONU is a subscriber set-top It is characterized by consisting of a third step of confirming the abnormality of the track by transmitting a test signal and confirming this.

Description

METHOD FOR EXAMINING DATA TRANSMISSION PATH IN FIBER TO THE HOME NETWORK}

The present invention relates to a method for monitoring a data transmission path in an FTTH network, and more particularly, to a method for monitoring an abnormality of a data transmission path in an FTTH network supporting a broadcasting / communication convergence service.

Currently, broadcast / communication convergence service delivers broadcast / communication data to each subscriber by using an FTTH network, which is an optical transmission network. The FTTH method is a subscriber line configuration that transmits telephone, fax, data communication, and TV video through a single optical cable by installing a subscriber line from a telephone station to each home with an optical cable.

1 is a block diagram showing a configuration for providing a broadcast / communication service in a typical FTTH network. As shown in FIG. 1, the FTTH network for providing a general broadcasting / communication service converts broadcast data received from a broadcasting company to provide a broadcasting service to a subscriber, and converts the broadcasting data into an optical signal. It consists of an optical network unit (ONU), a user-side device that delivers information received from an optical line terminal to a subscriber, and an optical cable connecting the OLT and the ONU. When the broadcast / communication data transmitted from the broadcaster is transmitted to the ONU via the OLT, the ONU receives the service request from the terminal of the service user and provides the corresponding service. In the case of transmitting the MPEG stream while providing such a service, the MPEG stream may be damaged during the conversion process to transmit to the subscriber set-top while passing through several nodes, or an error may occur in the line and thus the subscriber set-top is not transmitted.

As described above, when transmitting an MPEG stream for a broadcast / communication service in a general FTTH network, there is a problem that damage may occur to an original MPEG stream or damage to a transmission line to an end subscriber.

Accordingly, it is an object of the present invention to provide a method for identifying an abnormality of a data transmission line in an FTTH network.

Another object of the present invention is to provide a method for checking whether an error occurs in a data conversion process for transmitting data from an FTTH network to an end subscriber end.

A method of the present invention for achieving the above objects is a first process comprising a network management system for monitoring a data transmission path of the FTTH network in the FTTH network supporting broadcast / communication convergence service, and the network management OLT transmits a test signal to the ONU according to the control signal of the system and confirms the abnormality of the line through the confirmation, and if the abnormality is not confirmed in the first process, the ONU sends the test signal to the subscriber set-top. It is characterized by consisting of a third process of confirming the abnormality of the track by transmitting and confirming this.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

2 is a diagram illustrating a signal flow for monitoring an abnormality of an MPEG stream transmission path in an FTTH network supporting broadcast communication convergence service according to an embodiment of the present invention.

The network management system 200 is provided to monitor the data transmission path of the FTTH network. That is, the network management system 200 checks whether there is an abnormality in the MPEG stream transmission path in the FTTH network, and confirms whether an abnormality occurs in the process of converting the MPTS (Multi Program Transfer Stream) in order to transmit the FTTH network. Make sure the track is stable up to Setop. To this end, the network management system 200 transmits a test command signal to monitor the data transmission path to the OLT (202). This test command signal contains the specified settop information to be tested. The control unit 206 of the OLT 202 receiving the transmission transmits a test MPEG stream generation control signal to the test MPEG stream generation unit 208 to control the test MPEG stream to be generated and transmitted to the corresponding subscriber set-top 216. The received test MPEG stream generator 208 generates the test MPEG stream according to the MPTS standard. Then, the basic packet of the MPTS standard will be described with reference to FIG. 3. The MPTS is configured based on 188 bytes and consists of a header of 4 bytes and a payload of 184 bytes. The first 4 bytes of the packet are Header, sync Bayte (8), transport error indicator (1), payload unit start indicator (1), transport priority (1), pid (13), transport scrambling control (2), and adaptation field. It consists of control (2) and continuity count (4). That is, the header includes synchronization information (Sync) and PID (Program ID) information. The portion of the MPTS packet used for monitoring the data transmission path in the present invention is the PID portion. Therefore, the description of the remaining components will be omitted. Sync bytes are typically specified as 0x47. In the present invention, the PID value is preset to 0x55 to indicate that it is a test MPEG stream for monitoring the data transmission path in the FTTH network. In the present invention, the PID value for indicating that the test MPEG stream is set to 0x55, but it can be set to another specific value. The remaining header value is set to mode 0. As such, the header value created by setting the PID value to a specific value to indicate that it is a test MPEG stream is 0x47005500. The remaining payload 184 bytes are filled with 0xff.

One MPTS packet of the test MPEG stream as described above is made of 188 bytes of "47 00 55 00 FF FF FF FF FF .... FF". The test MPEG stream generator 208 generates one test MPEG stream by concatenating 100 such MPTS packets. The test MPEG stream generator 208 then transmits the generated test MPEG stream to the ONU 204. Upon receiving this, the MPEG stream converter 212 of the ONU 204 detects a sync byte of the test MPEG stream and checks whether the PID value is 0x55. Thereafter, if the PID value is 0x55, it recognizes that the test MPEG stream is for monitoring the transmission path, and transmits the test result to the network management system 200 through the control unit 210. The MPEG stream converter 212 converts the optical signal transmitted after being broadcast from the test MPEG stream generator 208 into an electrical signal by photoelectric conversion and separates each channel. If an abnormality occurs in this process, the network management system 200 detects that an abnormality has occurred in the MPEG stream converter 212 through a test result transmitted through the control unit 210 of the MPEG stream converter 212. . Thereafter, the subscriber channel allocator 214 switches and transmits an output signal transmitted from the MPEG stream converter 212 to the subscriber set-top 218 to transmit a channel desired by the subscriber. At this time, the sync byte is detected from the received test MPEG stream, and it is checked whether the PID value is 0x55. Thereafter, if the PID value is 0x55, it recognizes that the test MPEG stream is for transmission path monitoring, and if an error occurs, the subscriber channel allocator 214 transmits the test result to the network management system 200 through the control unit 210. .

 Then, the test MPEG stream converted and processed from the ONU 204 is transmitted to the subscriber set-top 218. The subscriber set-top 218, which has received this, detects a sync byte in the test MPEG stream and then determines whether the PID value is 0x55. Check it. Thereafter, if the PID value is 0x55, it recognizes that it is a test MPEG stream for monitoring the transmission path and transmits a response signal to the network management system 200 through the network. On the other hand, the network management system 200 may receive and confirm the test result transmitted through the control unit 210 from the receiving unit 212 to check the abnormality of the transmission line between the OLT 202 and the ONU 204, the ONU ( The abnormality of the transmission line between the 204 and the subscriber set-top 218 may be confirmed by receiving a response signal transmitted from the subscriber set-top 218. In addition, the abnormality of the normal MPEG stream conversion process in the ONU may be confirmed by receiving a test result transmitted through the control unit 210 from the transmission unit 216 that receives the MPEG stream converted by the MPEG stream conversion unit 214. .

Referring to FIG. 2, which shows an FTTH network supporting a broadcast / communication convergence service including the network management system 200, the network management system 200 uses a test MPEG stream in the FTTH network, and each MPEG stream is used. 4 is a flowchart for monitoring an abnormality of a transmission section.

First, in operation 400, the network management system 200 designates an end subscriber settop to test a new subscriber settop or an existing settop, and transmits a test command for monitoring the data transmission path to the corresponding OLT 202. Thereafter, in step 402, the network management system 200 waits for receiving a test result and a response signal transmitted from each MPEG stream transmission interval. Then, in step 404, the network management system 200 checks whether a test result of the transmission path between the OLT 202 and the ONU 204 is received, and if it is received in step 406, the network management system 200 checks this. After the test result checks that an abnormality occurs in the transmission path between the OLT 202 and the ONU 204, the flow proceeds to step 422 to appropriately deal with the abnormality. That is, the abnormality of the transmission path between the OLT 202 and the ONU 204 can be known by confirming the test result transmitted through the control unit 210 from the MPEG stream converter 212 of the ONU 204. In step 408, if there is no abnormality in the transmission path between the test result check result OLT 202 and the ONU 204 in step 406, the network management system 200 proceeds to step 410 in the ONU 204. During normal MPEG stream conversion, it is checked whether test results are received to check for abnormalities. If a test result for confirming an abnormality in the MPEG stream conversion process is received, the process proceeds to step 412 to check the received test result. Thereafter, the network management system 200 proceeds to step 414 and checks whether an error has occurred in the test MPEG stream processed through the subscriber channel allocator 214, and if there is an error, proceeds to step 422 to appropriately deal with the problem. Perform If it is determined in step 414 that there is no abnormality in the MPEG stream conversion process in the ONU 204, the network management system 200 determines whether a response signal for a test command is received from the subscriber set-top 218. Check it. In step 416, if the response signal is received, the network management system 200 checks the received response signal in step 418, and proceeds to step 420, the network management system 200 turns on the ONU 204 and the subscriber set-top 218. Check if any abnormality has occurred in the transmission path of the liver. If there is an error in the inspection result of step 420, the flow proceeds to step 422 and appropriate action is taken in case of an error. In addition, when it is confirmed in step 420 that there is no abnormality in the transmission path between the ONU 204 and the subscriber set-top 218, the network management system 200 confirms that there is no abnormality in all data transmission paths of the FTTH network.

As described above, in the FTTH network supporting the broadcasting / communication convergence service, the network management system transmits a test command for monitoring the data transmission path to the OLT, and the OLT is tested according to the control signal of the network management system. MPEG stream is generated and transmitted, and the test results and response signals are received from the ONU and the subscriber set-top and inspected to check the abnormality of the line between the OLT and the ONU and the line between the ONU and the subscriber set-top, and the normal data conversion process in the ONU. You can check whether there is an abnormality.

In the foregoing 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. For example, in the present invention, the PID value is preset to 0x55 to indicate that it is a test MPEG stream. However, the present invention may be applied by presetting the PID value to any other specific value. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by those equivalent to the claims.

As described above, the present invention includes a network management system for monitoring a data transmission path in an FTTH network supporting broadcast / communication convergence service, and transmits a test MPEG stream according to a control signal of the network management system, and a response signal thereto. Receive In this way, the line between the OLT and the ONU and the line between the ONU and the subscriber set-top can be checked, and the MPEG stream transmission section can be tested in real time during system set-up. In addition, when an error occurs in the transmission line, there is an advantage that can determine in which section the problem occurs. In addition, there is an advantage in that the network management system can immediately check whether there is an error on the line when a problem occurs due to a broadcast on the subscriber settop. In addition, the present invention provides a method for transmitting data from an FTTH network to an end subscriber end. There is an effect that can confirm whether an abnormality occurs in the data conversion process.

1 is a diagram showing a configuration for providing a broadcast / communication convergence service in a typical FTTH (Fiber To The Home) network;

FIG. 2 is a block diagram illustrating a signal flow for confirming an abnormality of a Moving Picture Experts Group (MPEG) stream transmission path in an FTTH network supporting broadcast / communication convergence service according to an embodiment of the present invention;

3 is a diagram showing a basic packet of a conventional Multi Program Transfer Stream (MPTS);

4 is a flowchart illustrating whether an MPEG stream transmission path is abnormal in an FTTH network supporting broadcast communication convergence service according to an embodiment of the present invention.

Claims (7)

In the FTTH network having an optical line terminal (OLT), an optical network unit (ONU) and a subscriber set-top, and supporting a broadcasting / communication convergence service, A first process having a network management system for monitoring a data transmission path of the FTTH network; A second step of the network management system confirming an abnormality in a line between the OLT and the ONU by transmitting a test MPEG stream to the ONU by the OLT and confirming the test MPEG stream received by the ONU; If the abnormality is not confirmed in the second process, the network management system transmits a test MPEG stream to the subscriber set-top by the ONU, and confirms the abnormality of the line through the response signal received from the subscriber set-top. and, In the second process, the network management system performs a test MPEG stream transmitted to the ONU through a normal MPEG stream conversion process in the ONU, and a fourth process of checking whether there is an abnormality in the MPEG stream conversion process. Data transmission path monitoring method in FTTH network. delete The method of claim 1, wherein the second process, Receiving, by the OLT, a control signal for testing a data transmission path of the network management system, generating a test MPEG stream, and transmitting the test MPEG stream to the ONU; The ONU receiving the test MPEG stream and transmitting a test result to the network management system; And the network management system receives the test result from the ONU and confirms an abnormality in a transmission line between the OLT and the ONU. The method of claim 1, wherein the third process comprises: If the abnormality of the transmission line between the OLT and the ONU is not confirmed, the ONU transmitting a test MPEG stream to the subscriber set-top; Receiving, by the subscriber set-top, the test MPEG stream and transmitting a response signal to the network management system; And the network management system receives the response signal from the subscriber set-top and confirms an abnormality in the transmission line between the ONU and the subscriber set-top. A network management system for monitoring the data transmission path of the FTTH network, an optical line terminal (OLT) including a test MPEG stream generating unit, an optical network unit (ONU) including an MPEG stream converter and a subscriber channel allocator, and a subscriber set-top ( In the FTTH network having a setop) and supporting a broadcast / communication convergence service, A first step of the network management system transmitting a test command signal for monitoring the data transmission path of the FTTH network to the OLT; Receiving, by the OLT, the test command signal, generating a test MPEG stream for monitoring the data transmission path by the MPEG stream generating unit, and transmitting the test MPEG stream to the ONU; The MPEG stream converter of the ONU receives the test MPEG stream and confirms that it is a test MPEG stream. If the received data is a test MPEG stream, the MPEG stream converter performs the test MPEG stream conversion. A third step of transmitting a test result for checking an abnormality of the network management system; A fourth step of transmitting a test result for confirming an abnormality of the test MPEG stream to the network management system by the subscriber channel allocator in the ONU if the abnormality is not confirmed in the third step; If the abnormality is not confirmed in the fourth process, the ONU transmits a test MPEG stream to the subscriber set-top, and a fifth process is performed to confirm the abnormality of the line through the confirmation. Route monitoring method. The FTTH network according to claim 5, wherein the test MPEG stream generated by the MPEG stream generator sets a PID (Program ID) value of the test MPEG stream to a specific value indicating that the test MPEG stream. How to monitor data transmission paths. The data transmission path of the FTTH network according to claim 5, wherein the step of confirming that the test MPEG stream is a process of confirming that a PID (Program ID) value of the test MPEG stream is a specific value representing the test MPEG stream. Surveillance Method.