WO2013107232A1

WO2013107232A1 - Detection method and system based on pon system

Info

Publication number: WO2013107232A1
Application number: PCT/CN2012/086620
Authority: WO
Inventors: 李明生; 卢金树; 陆建鑫
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-01-20
Filing date: 2012-12-14
Publication date: 2013-07-25
Also published as: CN102546010B; CN102546010A

Abstract

The present invention provides a detection method and system based on a PON system. The method comprises: configuring an OLT MAC chip with a set detection ONU as a virtual ONU in addition to a normally working ONU, allocating to the virtual ONU a bandwidth other than the bandwidth corresponding to the normally working ONU, and generating a detection indication signal corresponding to the virtual ONU, the detection indication signal comprising an identifier used for indicating a detection type; and sending the detection indication signal to an optical module at an OLT side within a time slot corresponding to the bandwidth allocated to the virtual ONU, so that the optical module at the OLT side executes a detection operation corresponding to the identifier used for indicating the detection type. The present invention solves the problem in the prior art that OTDR detection cannot be performed automatically and in real time and services of a normal ONU are influenced during OTDR detection, thereby guaranteeing that the services of the normal ONU are not influenced and improving real-time performance and automaticity of detection.

Description

TECHNICAL FIELD The present invention relates to the field of Passive Optical Networks (PON), and in particular to a detection method and system based on a PON system. BACKGROUND With the rapid development of network technologies and the popularization of network applications, network communication, online shopping, and online entertainment have become part of the modern life, and the speed of the network is being promoted, especially in the domestic or foreign countries, especially the access network. The network speed is increasing, and the most popular and promising technology at present is PON (Passive Optical Networks). At the same time, PON has begun to be deployed on a large scale at home and abroad, and has been widely used. Accepted by the operator. After a large number of PON devices are deployed and operated, it is necessary to perform daily operation and maintenance and management of these PON devices. Although some experience has been accumulated for the operation and maintenance of PON devices, there is still no effective means for fault location of optical fiber lines. Because most of the fiber is deployed outdoors, it is easy to be affected by various conditions and some abnormal phenomena occur. For example, the fiber is severely bent and the fiber is broken. When these anomalies occur, only the position and bending of the bending point are known. The cause of the break, the location of the break, and the cause of the break can be repaired. At present, the main reason for determining the cause and location of the fault of the optical fiber line is to diagnose the cause and location of the fault of the optical fiber line through an OTDR (Optical Time Domain Reflectometer) device, and use the OTDR device to detect In the case of a fault in the optical fiber line, the optical signal can be detected by combining the detected optical signal of the OTDR device into the trunk optical fiber through the combiner; or connecting the backbone optical fiber to the OTDR device to detect the optical fiber line. However, the above method of detecting an optical fiber line failure using an OTDR device has the following disadvantages:

1) OTDR equipment is relatively expensive, and it is not convenient to operate. The cost of the above method for detecting the fault of the optical fiber line is increased, and the operation difficulty is increased. 2) There are multiple ONUs (Optical Network Units, light) under the PON port. Network element), only the branch fiber of a few ONUs in multiple ONUs may be faulty. However, when the OTDR device is used to detect the fault of the optical fiber line, all ONU services need to be stopped, and the OTDR device is connected to the PON. , or will After the detection optical signal of the OTDR device is integrated into the trunk optical fiber, the services of all the ONUs are continued, and the fault of the optical fiber line is detected. Therefore, when the services of all the ONUs are stopped, the normal ONUs under the PON interface are affected. ;

3) The above method for detecting the failure of the optical fiber line using the OTDR device needs to detect the failure of the optical fiber line when the optical line is known to be faulty, and the optical line cannot be detected in real time and automatically. SUMMARY OF THE INVENTION The present invention provides a detection method and system based on a PON system, so as to at least solve the problem that the OTDR detection cannot be performed automatically and in real time in the related art, and the normal ONU under the PON port performs services during OTDR detection. According to an aspect of the present invention, a detection method based on a PON system is provided, including: an optical line terminal medium access control OLT MAC chip is configured with an ONU set to be detected as a virtual ONU outside a normally working optical network unit ONU The virtual ONU is allocated a bandwidth other than the bandwidth corresponding to the normally working ONU, and generates a detection indication signal corresponding to the virtual ONU, where the detection indication signal includes an identifier for indicating the detection type; The detection indicator is sent to the optical module on the OLT side in the time slot corresponding to the bandwidth, so that the optical module on the OLT side performs a detection operation corresponding to the identifier for indicating the detection type. Preferably, after the detection indication signal is sent to the optical module on the OLT side in the time slot corresponding to the bandwidth allocated for the virtual ONU, the PON system-based detection method further includes: the optical module on the OLT side receives the OLT MAC chip sending The detection indication signal, wherein the identifier for indicating the detection type in the detection indication signal comprises an optical power detection identifier or an optical time domain reflectometer OTDR detection identifier; and the optical module performs a detection operation corresponding to the identifier for indicating the detection type. Preferably, the step of the optical module performing the detecting operation corresponding to the identifier for indicating the type of the detecting comprises: obtaining an identifier for indicating the type of the detection from the detection indication signal; and if the acquired identifier for indicating the type of detection is OTDR detection The optical module performs OTDR detection. If the obtained identifier for indicating the detection type is an optical power detection identifier, the optical module performs optical power detection. Preferably, the step of performing the OTDR detection by the optical module includes: the optical module injecting the optical detection signal into the optical port of the trunk optical fiber for performing OTDR detection, wherein the optical detection signal is an optical signal having a wavelength of a non-downward operating wavelength. Preferably, after the optical module performs OTDR detection on the ONU, the foregoing PON system-based detection method further includes: the optical module acquires an OTDR detection result; and the optical module determines the status of the optical fiber line according to the OTDR detection result, and if the determined result has an alarm information, The optical module reports the OTDR detection result to the NMS. The NMS determines the cause of the fault and the location of the fault in the fiber line based on the OTDR detection result. Preferably, after the network management determines the cause of the fault in the optical fiber line and the location of the fault according to the OTDR detection result, the foregoing PON system-based detection method further includes: performing corresponding PON protection switching on the faulty location. Preferably, before the optical module receives the detection indication signal sent by the optical line terminal media access control OLT MAC chip, the PON system-based detection method further includes: the OLT MAC chip transmitting the detection indication signal to the optical module by using at least one of the following manners: The OLT MAC chip sends the detection indication signal to the optical module every preset period, or the OLT MAC chip sends the detection indication signal to the optical module after receiving the manually triggered instruction. According to another aspect of the present invention, a detection system based on a PON system is provided, including: an optical line terminal medium access control OLT MAC chip, wherein the OLT MAC chip includes: a configuration unit, configured to operate in an optical network An ONU is configured as a virtual ONU, and a virtual ONU is allocated a bandwidth other than the bandwidth corresponding to the normally working ONU, and generates a detection indication signal corresponding to the virtual ONU, where the detection indication signal includes The sending unit is configured to send the detection indication signal to the optical module on the OLT side in the time slot corresponding to the bandwidth allocated for the virtual ONU, so that the optical module on the OLT side performs the indication and is used for the indication. The detection type corresponds to the detection operation. Preferably, the PON system-based detection system further includes: an optical module on the OLT side, wherein the optical module includes: a receiving unit, configured to receive a detection indication signal sent by the OLT MAC chip, where the detection indication signal is used for indicating detection The type of identifier includes an optical power detection identifier or an optical time domain reflectometer OTDR detection identifier; and an execution unit configured to perform a detection operation corresponding to the identifier for indicating the detection type. Preferably, the execution unit includes: an obtaining module, configured to acquire an identifier for indicating a detection type from the detection indication signal; and the first execution module is configured to execute when the acquired identifier for indicating the detection type is an OTDR detection identifier OTDR detection; The second execution module is configured to perform optical power detection when the acquired identifier for indicating the detection type is an optical power detection identifier. Preferably, the first execution module includes: an injection sub-module configured to inject an optical detection signal into the optical port of the main fiber for OTDR detection, wherein the optical detection signal is an optical signal having a wavelength of a non-downward operating wavelength. Preferably, the PON system-based detection system further includes: an obtaining unit configured to acquire an OTDR detection result; and a reporting unit configured to determine a status of the optical fiber line according to the OTDR detection result, and if the determined result has an alarm information, the optical module The OTDR detection result is reported to the NMS, so that the NMS determines the cause of the fault and the location of the fault in the fiber line based on the OTDR detection result. Preferably, the foregoing PON system-based detection system further includes: a switching unit, configured to be based on the network management

After the OTDR detection result determines the cause of the failure in the fiber line and the location of the failure, the corresponding PON protection switching is performed at the location where the failure occurs. In the present invention, the OLT MAC chip configures an optical network unit ONU set to be detected as a virtual ONU outside the normally operating optical network unit ONU, and allocates a bandwidth corresponding to the normally operating optical network unit ONU for the virtual ONU. The bandwidth indicates that the detection indication signal corresponding to the virtual ONU is sent to the optical module on the OLT side in the time slot corresponding to the bandwidth allocated for the virtual ONU, so that the optical module performs the identifier corresponding to the detection indication signal for indicating the detection type. The detection operation enables the optical module to perform the detection operation on the optical line in real time according to the received detection indication signal. At the same time, the virtual ONU is configured outside the normal working optical network unit ONU, and the bandwidth allocated to the virtual ONU is normal. The working optical network unit ONU has different bandwidths, and sends a detection indication signal in the time slot of the virtual ONU, so that the optical module is detected based on the bandwidth of the virtual ONU, and the optical network unit can be guaranteed to operate normally when detecting. ONU's business has no impact, which improves system performance and helps improve user body . BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a preferred structural diagram of a detection system based on a PON system according to an embodiment of the present invention; FIG. 2 is a preferred structural diagram of an execution unit according to an embodiment of the present invention; A preferred structural diagram of a first execution module according to an embodiment of the present invention; FIG. 4 is another preferred structural diagram of a detection system based on a PON system according to an embodiment of the present invention; FIG. 5 is an embodiment of the present invention. Still another preferred structural diagram of a PON system based detection system; FIG. 6 is a preferred structural diagram of an optical module in accordance with an embodiment of the present invention; FIG. 7 is a preferred flowchart of a PON system-based detection method according to an embodiment of the present invention; FIG. 8 is another preferred flowchart of a PON system-based detection method according to an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. In the following embodiments, the communication may be implemented by a wireless connection or a wired connection or a combination of both, which is not limited by the present invention. Embodiment 1 FIG. 1 is a schematic structural diagram of a detection system based on a PON system according to an embodiment of the present invention. As shown in FIG. 1, the detection system based on a PON system includes an OLT MAC chip 102, wherein an OLT MAC chip The configuration unit 1021 is configured to configure an ONU set to be detected as a virtual ONU outside the normally operating optical network unit ONU, and allocate a bandwidth other than the bandwidth corresponding to the normally working ONU for the virtual ONU, and generate a detection indication signal corresponding to the virtual ONU, where the detection indication signal includes an identifier for indicating a detection type; the sending unit 1022 is in communication with the configuration unit 1021, and is configured to detect in a time slot corresponding to the bandwidth allocated for the virtual ONU. The indication signal is sent to the optical module on the OLT side, so that the optical module on the OLT side performs a detection operation corresponding to the identifier for indicating the detection type. Preferably, the PON system-based detection system according to the preferred embodiment of the present invention may further include: an optical module 104 on the OLT side, where the optical module 104 includes: a receiving unit 1041 configured to receive a detection indication signal sent by the OLT MAC chip 102. The identifier for indicating the type of detection in the detection indication signal includes an optical power detection identifier or an optical time domain reflectometer OTDR detection identifier. The execution unit 1042 is in communication with the receiving unit 1041, and is configured to perform an identifier for indicating the type of detection. Corresponding detection operations. In the preferred embodiment, the OLT MAC chip 102 configures an optical network unit ONU set to be detected as a virtual ONU outside the normally operating optical network unit ONU, and allocates a virtual ONU corresponding to the optical network unit ONU that works normally. The bandwidth of the bandwidth is different, and the detection indication signal corresponding to the virtual ONU is sent to the optical module 104 on the OLT side in the time slot corresponding to the bandwidth allocated by the virtual ONU, so that the optical module 104 performs the detection indication signal and the detection indication signal. The detection operation corresponding to the type of the identifier enables the optical module 104 to perform the detection operation on the optical line in real time according to the received detection indication signal. At the same time, the virtual ONU is configured outside the normally operated optical network unit ONU. The bandwidth allocated by the ONU is different from the bandwidth corresponding to the ONU of the optical network unit that is working normally, and the detection indication signal is sent in the time slot of the virtual ONU, so that the light is made. The module 104 is configured to detect the bandwidth of the virtual ONU. When the detection is performed, the function of the ONU of the optical network unit that works normally is not affected, thereby improving the performance of the system and improving the user experience. In the preferred embodiment, the sending unit 1022 is further configured to send the detection indication signal to the light in at least one of the following manners before the optical module 104 receives the detection indication signal sent by the optical line terminal media access control OLT MAC chip 102. Module 104: The OLT MAC chip 102 sends a detection indication signal to the optical module 104 every preset period, or the OLT MAC chip 102 sends a detection indication signal to the optical module 104 after receiving the manually triggered instruction. In this embodiment, the OLT MAC chip 102 can preset a period for transmitting the detection indication signal, and different period lengths can be set according to different detection requirements to meet different detection requirements. Meanwhile, it can also be triggered by a manual trigger method. The OLT MAC chip 102 sends a detection indication signal. For example, when the optical line is faulty, the OLT MAC chip 102 can be manually triggered to send a detection indication signal at any time to detect the failure of the optical line. Therefore, different scenarios can be selected. The manner of transmitting the detection indication signal enhances the flexibility of use of the embodiment. In the preferred embodiment, a preferred execution unit 1042 is provided. As shown in FIG. 2, the execution unit 1042 includes: an obtaining module 202, configured to acquire an identifier for indicating a detection type from the detection indication signal; An execution module 204, in communication with the obtaining module 202, is configured to perform OTDR detection when the acquired identifier for indicating the detection type is an OTDR detection identifier; the second execution module 206 is in communication with the acquisition module 202, and is set to be acquired. When the identifier indicating the type of detection is the optical power detection identifier, optical power detection is performed. In the present embodiment, different detections can be performed based on the identifications of different detection types included in the detection indication signal, thereby enhancing the utility of the present invention. In the preferred embodiment, a preferred first execution module 204 is provided. As shown in FIG. 3, the first execution module 204 includes: an injection sub-module 302 configured to inject light detection signals into the light of the backbone fiber. The OTDR detection is performed in the port, wherein the optical detection signal is an optical signal whose wavelength is a non-downward operating wavelength. In this embodiment, the optical detection signal is injected into the optical port of the main fiber to realize detection of the optical line, and at the same time, the optical detection signal is an optical signal whose wavelength is a non-downward operating wavelength. Preferably, the non-downward operating wavelength refers to any wavelength except one wavelength. For example, in a GPON system, the downlink operating wavelength is an operating wavelength in the range of (1480 - 1500) nm centered at 1490 nm, and the upstream operating wavelength is The operating wavelength in the range of (1290 - 1330) nm centered at 1310 nm, the non-downstream operating wavelength means that the operating wavelength is not in the range of 1490 nm (1480 to 1500) nm, for example, 1310 nm, Operating wavelengths of 1550nm, 1575nm; In XGPON systems, the downstream operating wavelength is the operating wavelength in the range of (1575 1580) nm centered at 1577nm, and the upstream working wavelength is centered at 1270nm in the (1260 1280;) nm range. Operating wavelength inside, non-downward operating wavelength means working as long as it is not in the range of 1577 nm (1575 to 1580 nm) nm The wavelengths can be, for example, working wavelengths such as 1310 nm, 1490 nm, and 1550 nm; of course, the operating wavelength of the OTDR is required to meet the operating wavelength of the OTDR. In the preferred embodiment, as shown in FIG. 4, the PON system-based detection system includes: an obtaining unit 1043 configured to acquire an OTDR detection result; a reporting unit 1044, in communication with the obtaining unit 1043, configured to determine according to the OTDR detection result. The status of the optical fiber line, if there is an alarm information in the determined result, the OTDR detection result is reported to the network management system, so that the network management determines the cause of the failure and the location of the failure in the optical fiber line according to the OTDR detection result. In this embodiment, when it is determined that the OTDR detection result has the alarm information, the OTDR detection result is reported to the network management system, so as to determine the cause of the fault in the optical fiber line and the location of the fault, and provide an easy-to-read, accurate optical fiber line. The condition thus improves the detection accuracy of the present invention. In the preferred embodiment, as shown in FIG. 5, the above PON system-based detection system includes: a switching unit

1045. After the network management determines the cause of the fault in the optical fiber line and the location of the fault according to the OTDR detection result, perform corresponding PON protection switching at the fault location. In this embodiment, after determining the cause of the fault in the optical fiber line and the location of the fault according to the OTDR detection result, performing corresponding PON protection switching at the location where the fault occurs, to avoid corresponding PON protection switching according to the signal loss phenomenon, Therefore, the PON protection switching can be performed simply, intuitively, and effectively according to the OTDR detection result. In the preferred embodiment, a preferred optical module 104 is provided. As shown in FIG. 6, the optical module 104 includes:

1. The optical module 104 includes an OTDR processing module in addition to the normal service transceiver function module, and the OTDR processing module (equivalent to the execution unit 1022) can complete the OTDR detection function; the optical module 104 and the PON MAC (Media Access Control) The interface between the chips 104 also includes:

1) I2C (Inter-Integrated Circuit) (equivalent to acquisition unit 106) interface, set to ONU optical power, OTDR event (equivalent to OTDR detection result) and OLT PON optical module 104 characteristics acquisition interface;

2) The Trigger signal (equivalent to the detection indication signal) is set to trigger the optical module 104 to obtain the ONU optical power or initiate the OTDR measurement, and the Trigger signal is output by the PON MAC chip under the control of the DBA module.

The Trigger signal is defined by the Trigger signal measured by the current RSSI (Received Signal Strength Indication), and the specific detection function of the Trigger signal is configured by the I2C;

3) PON upstream operating wavelength (eg, 1310 nm) and downstream wavelength (eg, 1490 nm) data path differential interface; 2. Use the upstream wavelength (for example, GPON is 1310 nm, 10G GPON is 1277 nm, etc.) or other non-downstream wavelengths as the test optical signal; preferably, the non-downward working wavelength refers to any wavelength other than one wavelength, for example, in a GPON system. The downstream operating wavelength is the operating wavelength in the range of (1480 - 1500) nm centered at 1490 nm, and the upstream working wavelength is the operating wavelength in the range of (1290 ~ 1330) nm centered at 1310 nm, non-downward operating wavelength. It means that as long as the working wavelength is not in the range of 1490nm (1480 ~ 1500) nm, for example, 1310nm, 1550nm, 1575nm and other working wavelengths; in XGPON system, the downstream working wavelength is centered at 1577nm. (1575 1580) Operating wavelength in the nm range, the upstream operating wavelength is the operating wavelength in the range of (1260 1280) nm centered at 1270 nm, and the non-downward operating wavelength is as long as it is not centered at 1577 nm (1575 ~ 1580 nm) nm The working wavelengths in the range can be, for example, working wavelengths such as 1310nm, 1490nm, and 1550nm; of course, the operating wavelength of the OTDR needs to be full. The working wavelength of the characteristics of the foot OTDR.

3. The receiving device of the OTDR module shares a receiver with the uplink signal of the normal PON to reduce the cost;

4. The OTDR test is controlled by the Trigger signal. The test result is fed back to the system through the I2C interface. Among them, λΤ is the wavelength of the OTDR test optical signal, λυ is the data uplink working wavelength, and λϋ is the data downlink working wavelength; λΤ can be equal to λυ, also It may not be equal to λυ, and preferably, λΤ is equal to λυ, but λΤ must not be equal to λϋ. In the above preferred embodiment, the detection indication signal is sent to the optical module 104 by the OLT MAC chip 102. After receiving the detection indication signal, the optical module 104 performs a detection operation corresponding to the identifier for indicating the detection type, and implements the use of the optical module 104. The detection operation of the optical line avoids the use of the external device to detect the optical line, thereby avoiding the normal ONUs under the mouth when performing the detection of the optical line by using the external device; meanwhile, the OLT MAC chip 102 can The detection indication signal is sent every preset period to avoid fault detection of the optical line when the optical line is found to be faulty, so that the optical line can be detected in real time and automatically, and the OTDR equipment is used in the related art to solve the optical fiber line. The detection of the ONU that affects the normal ONU under the PON port and the failure to detect the optical line in real time and automatically can ensure that the normal ONU under the PON port does not affect the service when detecting the optical line. At the same time, the real-time and automatic detection are improved. Embodiment 2 On the basis of FIG. 1-6, the preferred embodiment provides a preferred PON system-based detection method. As shown in FIG. 7, the PON system-based detection method includes: S702: The optical line terminal medium access control OLT MAC chip configures an ONU set to be detected as a virtual ONU outside the normal working optical network unit ONU, and allocates a bandwidth other than the bandwidth corresponding to the normally working ONU for the virtual ONU. And generating a detection indication signal corresponding to the virtual ONU, where the detection indication signal includes an identifier for indicating a detection type; S704: transmitting the detection indication signal to the OLT side in a time slot corresponding to the bandwidth allocated for the virtual ONU And a module, so that the optical module on the OLT side performs a detection operation corresponding to the identifier for indicating the type of detection. In the above preferred embodiment, the OLT MAC chip configures an optical network unit ONU set to be detected as a virtual ONU outside the normally operating optical network unit ONU, and allocates a bandwidth corresponding to the normally operating optical network unit ONU for the virtual ONU. The detection indicator signal corresponding to the virtual ONU is sent to the optical module on the OLT side in the time slot corresponding to the bandwidth allocated for the virtual ONU, so that the optical module performs the identifier for indicating the detection type in the detection indication signal. Corresponding detection operations enable the optical module to perform real-time and automatic detection of the optical line according to the received detection indication signal. Meanwhile, a virtual ONU is configured outside the normally operating optical network unit ONU to allocate bandwidth for the virtual ONU. The bandwidth corresponding to the ONU of the optical network unit that is working normally is different. The detection indication signal is sent in the time slot of the virtual ONU, so that the optical module is detected based on the bandwidth of the virtual ONU, and the normal working light can be realized when detecting. The service of the network unit ONU does not affect, thereby improving the performance of the system and helping to change user experience. In the preferred embodiment, after the detection indication signal is sent to the optical module on the OLT side in the time slot corresponding to the bandwidth allocated for the virtual ONU, the PON system-based detection method further includes: the optical module on the OLT side receives the OLT. a detection indication signal sent by the MAC chip, where the identifier for indicating the detection type in the detection indication signal includes an optical power detection identifier or an optical time domain reflectometer OTDR detection identifier; and the optical module performs an identifier corresponding to the identifier for indicating the detection type. Detection operation. In this embodiment, after the optical module receives the detection indication signal sent by the MAC chip, the detection operation is performed, and the optical module can perform detection in real time according to the detection indication signal, and the optical module can be used according to the detection indication signal. The optical power detection or OTDR detection is performed on the identifier indicating the type of detection, thereby enhancing the practicability of the detection method. In the preferred embodiment, before the optical module receives the detection indication signal sent by the optical line terminal media access control OLT MAC chip, the OLT MAC chip sends the detection indication signal to the optical module in at least one of the following ways: OLT MAC chip every The preset period sends the detection indication signal to the optical module, or the OLT MAC chip sends the detection indication signal to the optical module after receiving the manually triggered instruction. In this embodiment, the OLT MAC chip can preset the period for sending the detection indication signal, and different period lengths can be set according to different detection requirements to meet different detection requirements. Meanwhile, the OLT can also be triggered by manual triggering. The MAC chip sends a detection indication signal. For example, when it is known that the optical line is faulty, the OLT MAC can be manually triggered at any time. The chip transmits the detection indication signal and detects the failure of the optical line in time. Therefore, different manners of transmitting the detection indication signal can be selected for different scenarios, thereby enhancing the flexibility of use of the embodiment. In the preferred embodiment, a method is provided for performing a detection operation corresponding to an identifier for indicating a detection type, and specifically, the optical module performs an identifier corresponding to the identifier for indicating the detection type. The method for detecting the operation includes: obtaining an identifier for indicating a detection type from the detection indication signal; if the acquired identifier for indicating the detection type is an OTDR detection identifier, the optical module performs OTDR detection; The identifier of the optical power detection identifier is used by the optical module to perform optical power detection. In the present embodiment, different detections can be performed based on the identifications of different detection types included in the detection indication signal, thereby enhancing the utility of the present invention. In the preferred embodiment, a method for performing OTDR detection by a preferred optical module is provided. Specifically, the method for performing OTDR detection by the optical module includes: the optical module injecting the optical detection signal into the optical port of the trunk optical fiber for OTDR detection. Wherein, the light detection signal is an optical signal whose wavelength is a non-downward operating wavelength. In this embodiment, the optical detection signal is injected into the optical port of the main fiber to realize detection of the optical line, and at the same time, the optical detection signal is an optical signal whose wavelength is a non-downward operating wavelength. Preferably, the non-downward operating wavelength refers to any wavelength except one wavelength. For example, in a GPON system, the downlink operating wavelength is an operating wavelength in the range of (1480 - 1500) nm centered at 1490 nm, and the upstream operating wavelength is The operating wavelength in the range of (1290 - 1330) nm centered at 1310 nm, the non-downstream operating wavelength means that the operating wavelength is not in the range of 1490 nm (1480 to 1500) nm, for example, 1310 nm, Operating wavelengths of 1550nm, 1575nm; In XGPON systems, the downstream operating wavelength is the operating wavelength in the range of (1575 1580) nm centered at 1577nm, and the upstream working wavelength is centered at 1270nm in the (1260 1280;) nm range. The operating wavelength inside, the non-downward operating wavelength means that the operating wavelength is not in the range of 1577 nm (1575 to 1580 nm) nm, for example, 1310 nm, 1490 nm, 1550 nm, etc.; of course, the operating wavelength of the OTDR is selected. The operating wavelength required to meet the characteristics of the OTDR. In the preferred embodiment, the PON system-based detection method further includes: after the optical module performs OTDR detection on the ONU, the optical module acquires an OTDR detection result; and the optical module determines the status of the optical fiber line according to the OTDR detection result, if the determined result is If the alarm is generated, the optical module reports the OTDR detection result to the NMS. The NMS determines the cause of the fault and the location of the fault in the fiber line based on the OTDR detection result. In this embodiment, in the embodiment, when it is determined that the OTDR detection result has the alarm information, the OTDR detection result is reported to the network management system, so as to determine the cause of the fault in the optical fiber line and the location of the fault, and provide an easy-to-read The condition of the precise optical fiber line improves the detection accuracy of the present invention. In the preferred embodiment, the foregoing PON system-based detection method further includes: after determining, by the network management, the cause of the fault in the optical fiber line and the location of the fault according to the OTDR detection result, where the fault occurs. Perform corresponding PON protection switching on it. In this embodiment, after determining the cause of the fault in the optical fiber line and the location of the fault according to the OTDR detection result, performing corresponding PON protection switching at the location where the fault occurs, to avoid corresponding PON protection switching according to the signal loss phenomenon, Therefore, the PON protection switching can be performed simply, intuitively, and effectively according to the OTDR detection result. In the preferred embodiment, another preferred PON system-based detection method is provided. As shown in FIG. 8, the PON system-based detection method includes:

S802: A virtual ONU is configured in the DBA (Dynamic Bandwidth Assignment) module of the OLT PON-MAC chip. For example, the ONU ID is fixed to 0, and the actually used ONU is not assigned a number with an ONU ID of 0. And assigning the virtual ONU a fixed bandwidth that satisfies the OTDR event, hereinafter referred to as Tv, which can be periodically or manually assigned to allocate such a bandwidth, and can trigger an OTDR event in a period of Τν time slot or at a specified time; preferably, for For the determination of Tv, the size of Tv can be determined as follows:

1) dynamically determine the size of the allocated time slot Tv according to the situation of the entire ODN network, and the time required for the OTDR test optical signal to reach the longest distance ONU in the ODN network should be less than Tv/2; and each ONU in the entire network The distance can be obtained by ranging. After obtaining the distance of all the ONUs under the mouth, the maximum actual distance can be obtained, and the speed of light and the refractive index in the fiber are also known, so that the formula can be used to calculate the farthest. The time required by the ONU is Tl. At this time, it is necessary to ensure that Tv is greater than 2T1. Assuming that the bandwidth allocated to the virtual ONU is B bps, the DBA module determines the period T according to T1 and the bandwidth B bps allocated to the virtual ONU (OTDR per second) The number of monitoring) and Tv, the above two parameters can be determined according to the following formula: Τν > 2Τ1

Τ < (Β X 6.43 I 8) I (2T1 + 1)

2) For Tv, a static method can be used to determine that the maximum physical distance and logical distance supported by each ODN network are already, and the maximum physical distance supported by it is regarded as the farthest ONU distance, and Tl is calculated. Then, calculate Tv and Τ, where Τ must be greater than or equal to 1. S804: When the optical module receives the trigger (Trigger) signal, the OTDR processing module needs to determine whether to perform optical power measurement or OTDR event according to the previous configuration, that is, the optical module supports optical power measurement and OTDR detection, and if the OTDR detection is performed, Then, the process goes to step S806, if the measurement of the optical power is performed, the process goes to step S812;

S806: When the MAC allocates a Tv bandwidth for the virtual ONU, the OTDR module obtains OTDR test data in the Tv time slot. Specifically, triggering an OTDR event and acquiring optical power adopts a Trigger signal inside the optical module. To trigger, you need to measure the optical power or trigger the OTDR event. First, the CPU informs the optical module through the I2C whether it is currently measuring optical power or OTDR event, and then sets the MAC chip, and the MAC chip sends the Trigger signal to the optical module. If it is OTDR measurement, The relevant module needs to be notified to prepare the OTDR measurement, and the optical power measurement is not required. At the same time, the Trigger signal is used to notify the OTDR test wavelength laser to turn on and emit the detection optical signal, and the detection optical signal is injected into the PON optical port, wherein the test optical signal can be a pulse. Or sequence

S808: In order to reduce the test noise, repeat the above process of allocating Tv and OTDR tests, wherein the number of times of Tv is repeatedly allocated until the test accuracy required by the OTDR test processing module is satisfied, generally several thousand to several hundred thousand times, and the optical module control and The OTDR processing module averages the tested data to obtain the final test result;

S810: After the measurement is completed, the current measured OTDR event is read by the I2C, and the OTDR test curve data is obtained, and the optical line condition is analyzed according to the OTDR event. If the optical line has the alarm information, the OTDR event is reported to the network management, and at the same time, the network management Comprehensive analysis of various OTDR events and alarm information (for example, ONU signal loss, OLT PON trunk signal loss, etc.), giving user-readable ODN network fault information, ODN network fault information can accurately indicate the ODN network The cause of the fault and the location of the fault, the OTDR detection process ends; S812: If the optical power measurement is performed, only the signal is sent to the optical module control and the OTDR function module notifies it to complete the measurement of the optical power without triggering the OTDR measurement. Wavelength lasers (the specific optical power detection mode is exactly the same as the existing optical power detection mode, and will not be described here);

S814: The optical module indicates that the optical power measurement ends.

S816: The optical power measurement result is read through the I2C interface, and the optical power measurement process ends. In the above preferred embodiment, the method for detecting the optical line avoids the use of the external device compared with the prior art, thereby reducing the cost of detecting the optical line; at the same time, reducing the operation difficulty and improving the optical line Convenience of detection; It not only affects the normal service in the existing network while locating the fault, saves the operation and maintenance cost, can locate the optical line fault in real time, and can locate the fault and the fault of the optical line faster, more accurately and intelligently. The location can detect and solve the fault of the optical line in time, and improve the satisfaction of operators and customers. At the same time, the PON OLT optical module with the OTDR function does not need to be changed. The optical interface optical interface that supports the optical layer OLS parameters (including RSSI measurement) detection function is still used to ensure the OLT system deployed on the live network. The OTDR function can be supported by replacing the optical module and upgrading the software version, and a large number of expensive OLT PON cards and other components of the OLT do not need to be changed, reducing network investment. Further, in the preferred embodiment, the 0TDR measurement can not only provide the user with the cause of the failure of the 0DN network and the location of the fault, but also accelerate the maintenance and positioning of the network fault, and the OTDR measurement function can also pass the fiber connectivity. Detecting to implement various protections of the PON, using OTDR measurement results as protection trigger conditions, for example, PON cross-OLT TYPE B PON protection and OLT TYPE B protection, the OTDR function can be used to detect the OLT and the first fraction Whether the backbone fiber between the SPILITER is normal, if the fault is detected, the PON protection switching is triggered, and the OTDR detection is used for the PON protection. The PON protection is simpler and more intuitive than the current LOS (Loss of Signal) detection. And valid, when the OTDR function is used for PON network protection, the OTDR detection mode needs to be set to the periodic real-time detection mode. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. A detection method based on a PON system, comprising:

The optical line terminal medium access control OLT MAC chip configures an ONU set to be detected as a virtual ONU outside the normally operating optical network unit ONU, and allocates the virtual ONU with a bandwidth other than the normally working ONU. And generating a detection indication signal corresponding to the virtual ONU, where the detection indication signal includes an identifier for indicating a detection type;

Transmitting the detection indication signal to the optical module on the OLT side in the time slot corresponding to the bandwidth allocated by the virtual ONU, so that the optical module on the OLT side performs the identification with the identifier for indicating the detection type. Corresponding detection operation.

The method according to claim 1, wherein, after the detecting the indication signal is sent to the optical module on the OLT side in the time slot corresponding to the bandwidth allocated by the virtual ONU, the method further includes:

The optical module on the OLT side receives the detection indication signal sent by the OLT MAC chip, where the identifier for indicating the detection type in the detection indication signal includes an optical power detection identifier or an optical time domain reflectometer OTDR detection identifier; The light module performs a detection operation corresponding to the identifier for indicating the type of detection.

The method according to claim 2, wherein the step of the optical module performing the detecting operation corresponding to the identifier for indicating the type of detection comprises:

Obtaining the identifier for indicating a detection type from the detection indication signal;

If the obtained identifier for indicating the detection type is an OTDR detection identifier, the optical module performs OTDR detection; if the acquired identifier for indicating the detection type is an optical power detection identifier, The optical module performs optical power detection.

The method of claim 3, wherein the step of performing the OTDR detection by the optical module comprises: the optical module injecting a light detection signal into an optical port of a trunk optical fiber for performing OTDR detection, wherein the optical detection signal It is an optical signal whose wavelength is a non-downward operating wavelength.

The method according to claim 3 or 4, wherein after the OTDR detection by the optical module on the ONU, the method further includes: The optical module acquires an OTDR detection result.

The optical module determines the status of the optical fiber line according to the OTDR detection result, and if the determined result has the alarm information, the optical module reports the OTDR detection result to the network management, and the network management determines the OTDR detection result according to the OTDR detection result. The cause of the failure in the fiber line and the location of the failure.

The method according to claim 5, wherein after the network management determines the cause of the fault in the optical fiber line and the location of the fault according to the OTDR detection result, the network management further includes: performing the faulty location Corresponding PON protection switching.

The method according to claim 1, wherein before the optical module receives the detection indication signal sent by the optical line terminal media access control OLT MAC chip, the method further includes:

The OLT MAC chip sends the detection indication signal to the optical module in at least one of the following manners: the OLT MAC chip sends the detection indication signal to the optical module every preset period, or The OLT MAC chip sends the detection indication signal to the optical module after receiving the manually triggered instruction.

A PON system-based detection system, comprising: an optical line terminal medium access control OLT MAC chip, wherein the OLT MAC chip comprises:

The configuration unit is configured to configure an ONU for detecting as a virtual ONU outside the ONU of the working optical network unit, and allocate the bandwidth of the virtual ONU except the bandwidth corresponding to the normally working ONU, and generate a detection indication signal corresponding to the virtual ONU, where the detection indication signal includes an identifier for indicating a detection type;

The sending unit is configured to send the detection indication signal to the optical module on the OLT side in the time slot corresponding to the bandwidth allocated by the virtual ONU, so that the optical module on the OLT side performs the indication and the indication The detection type corresponds to the detection operation.

9. The system of claim 8, further comprising: the optical module on the OLT side, wherein the optical module comprises:

The receiving unit is configured to receive the detection indication signal sent by the OLT MAC chip, where the identifier for indicating the detection type in the detection indication signal includes an optical power detection identifier or an optical time domain reflectometer OTDR detection identifier;

And an execution unit configured to perform a detection operation corresponding to the identifier for indicating a detection type.

The system according to claim 9, wherein the execution unit comprises: an obtaining module, configured to acquire the identifier for indicating a detection type from the detection indication signal;

The first execution module is configured to perform OTDR detection when the acquired identifier for indicating the detection type is an OTDR detection identifier, and the second execution module is configured to: When the identification of the optical power detection flag is performed, optical power detection is performed.

The system according to claim 10, wherein the first execution module comprises:

The injection sub-module is configured to inject an optical detection signal into the optical port of the trunk optical fiber for performing OTDR detection, wherein the optical detection signal is an optical signal having a wavelength of a non-downward operating wavelength.

12. The system of claim 10 or 11, further comprising:

The obtaining unit is set to obtain an OTDR detection result;

The reporting unit is configured to determine the status of the optical fiber line according to the OTDR detection result, and if the determined result has the alarm information, the optical module reports the OTDR detection result to the network management, so that the network management device detects the OTDR according to the OTDR. The result determines the cause of the failure in the fiber optic line and the location of the failure.

13. The system of claim 12, further comprising:

The switching unit is configured to perform a corresponding PON protection switching at the location where the fault occurs after the network management determines the cause of the fault in the optical fiber line and the location of the fault according to the OTDR detection result.