WO2011069386A1 - Unité de réseau optique et procédé de détection et de contrôle de défaillance de cette dernière - Google Patents

Unité de réseau optique et procédé de détection et de contrôle de défaillance de cette dernière Download PDF

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Publication number
WO2011069386A1
WO2011069386A1 PCT/CN2010/077420 CN2010077420W WO2011069386A1 WO 2011069386 A1 WO2011069386 A1 WO 2011069386A1 CN 2010077420 W CN2010077420 W CN 2010077420W WO 2011069386 A1 WO2011069386 A1 WO 2011069386A1
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Prior art keywords
optical
network unit
optical network
module
power
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PCT/CN2010/077420
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English (en)
Chinese (zh)
Inventor
刘洋
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中兴通讯股份有限公司
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Publication of WO2011069386A1 publication Critical patent/WO2011069386A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0793—Network aspects, e.g. central monitoring of transmission parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07955—Monitoring or measuring power

Definitions

  • the present invention relates to a passive optical network, and more particularly to an optical network unit and a method for detecting and controlling the same. Background technique
  • PON Passive Optics Network
  • ADSL asymmetric digital subscriber line
  • PON refers to passive electronic equipment consisting of an optical line terminal (OLT, Optics Line Terminate) as a central office equipment, an optical network unit (ONU, Optic Network Unit) as an end device, and an optical distribution network (ODN, Optics Distribution Network). Equipment system. Passive is one of them.
  • the basic structure of the ONU is shown in Figure 1. It mainly includes the main central processing unit (CPU), optical module and transmission power module.
  • the main CPU is configured to control the optical module to send data in a specific time slot
  • the sending power module is configured to receive control of the main CPU and send power to the optical module.
  • the downlink central office equipment continuously broadcasts and transmits, and the ONU selectively receives; the uplink sub-slot burst sends, and each ONU transmits data only in the time slot allocated by the central office.
  • the central office equipment such as the case of long-lighting, which will inevitably affect the data transmission of other ONUs, affecting normal conditions.
  • the invention provides an optical network unit and a fault detection and control method thereof, which can improve the detection capability of the ONU, and prevent the faulty ONU from affecting other normal working ONUs.
  • the present invention provides a fault detection method for an optical network unit, including: when the optical module has a signal detection (SD, Signal Detection) signal output, the optical power of the optical module is read twice, twice.
  • SD Signal Detection
  • the optical power of the optical network is read, it is determined that the optical network unit is faulty; wherein, the time interval between the two reading operations is a set duration, and the first value range of the set duration is greater than the light.
  • the duration of one illuminating time slot of the network unit is less than the time interval during which the optical network unit illuminates normally twice.
  • the method further includes:
  • the illuminating control signal is a signal that the optical network unit controls the illuminating of the optical module.
  • the method further includes:
  • the optical network unit fails; if the lighting control signal is the same as the lighting indication signal, the failure detection is resumed.
  • the method further includes: determining that the sending power of the optical module is turned on before the outputting the optical power of the optical module is performed twice when the optical module has an SD signal output.
  • the method before the determining that the sending power of the optical module is turned on, the method further includes: determining whether the optical network unit starts the long light detecting function, and if the long light detecting function is activated, determining whether the sending power of the optical module is On; if long illuminating detection is not activated
  • the above method further includes:
  • the transmission power of the optical module is cut off.
  • the present invention provides an optical network unit, including a main CPU and an optical module, where the main CPU is configured to: when determining that the optical module has a signal detection SD signal output, read the optical module twice. Transmitting optical power, when the transmitted optical power can be read twice, determining that the optical network unit is faulty;
  • the time interval between the two read operations is a set duration, and the first value range of the set duration is greater than the duration of one of the optical network slots of the optical network unit and is smaller than the continuous duration of the optical network unit.
  • the time interval between two normal illuminations is a set duration, and the first value range of the set duration is greater than the duration of one of the optical network slots of the optical network unit and is smaller than the continuous duration of the optical network unit.
  • main CPU includes:
  • the transmitting optical power reading module is specifically configured to read the transmitting optical power of the optical module in two times when determining that the optical module has an SD signal output;
  • the fault determining module is specifically configured to determine that the optical network unit is faulty when the transmitted optical power can be read twice.
  • main CPU further includes:
  • a pulse width detecting module configured to detect a pulse width of the light emission control signal when only one transmission optical power is read once or no transmission optical power is read twice;
  • the fault determining module is further configured to: determine whether the pulse width is within a second value range, and determine that the optical network unit is faulty when the pulse width of the light emission control signal is not within the second value range,
  • the second value range is greater than 0 and less than the duration of one illuminating time slot of the optical network unit.
  • the fault determining module is further configured to: determine, when the pulse width of the lighting control signal is within the second value range, whether the lighting control signal is the same as the lighting indication signal sent by the optical module, and determine the location when the two are different The optical network unit has failed.
  • the main CPU includes:
  • the transmitting optical power reading module is specifically configured to read the transmitting optical power of the optical module twice when the optical module has an SD signal output;
  • the control module is configured to cut off the sending power of the optical module when the optical network unit fails.
  • main CPU further includes:
  • a pulse width detecting module configured to detect a pulse width of the illumination control signal when only one transmission optical power is read once or no transmission optical power is read twice;
  • the control module is further configured to: when the pulse width of the illumination control signal is not within the second value range, cutting off the transmission power of the optical module, where the second value range is greater than 0 and less than one illumination time slot of the optical network unit duration.
  • the control module is further configured to: when the pulse width of the illumination control signal is within the second value range, determine whether the illumination control signal is the same as the illumination indication signal sent by the optical module, and cut the optical module when the two are different. Send power.
  • the present invention provides a fault detection and control method for an ONU.
  • the duration of the main CPU in more than one illuminating time slot is less than the time during which the optical network unit normally emits light twice.
  • the optical module is determined to be abnormal, and then the optical network unit is determined to be faulty.
  • the main CPU can also determine whether the optical module is abnormal by detecting the pulse width of the illumination control signal, thereby determining the optical network unit. Whether the fault occurs, and the transmission power of the optical module is cut off when the optical network unit fails, so as not to affect other normal working ONUs;
  • the main CPU can also determine whether the optical network unit is faulty by determining whether the lighting control signal is the same as the lighting indication signal sent by the optical module, and further whether to cut off the transmission power of the optical module. It can be seen that the optical network unit can be improved by the method of the invention.
  • the obstacle detection capability enables effective control of the optical network unit at the same time, so as to prevent the faulty ONU from affecting other normally working ONUs.
  • Figure 1 is a schematic diagram of the basic structure of the ONU
  • FIG. 2 is a schematic flowchart of a method for controlling an ONU according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a time slot for normal ONU of an ONU
  • FIG. 4 is a schematic diagram of a pulse width detection principle of an illumination control signal
  • FIG. 5 is a schematic diagram showing the principle of detecting whether the illumination control signal and the illumination indication signal are the same;
  • FIG. 6 is a schematic diagram of a first optical network unit according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a second optical network unit according to an embodiment of the present invention. detailed description
  • the faulty ONU needs to be controlled so as not to affect other normal working ONUs.
  • FIG. 3 a schematic diagram of a time slot in which an optical network unit is normally illuminated, and a time period in which an optical network unit is normally illuminated when the optical network unit is normally illuminated is t1, and the optical network unit is illuminated during normal operation.
  • the time slot will illuminate, and the duration of the illuminating time slot will not be illuminated.
  • the central office will allocate the illuminating time slot again for the optical network unit, and the optical network unit starts to emit light again; that is, if When the optical network unit works normally, the optical network unit emits light in the (0, tl) time range, does not emit light in the (tl, 12) time range, continues to emit light in the (t2, 13) time range, and so on.
  • the interval time t is set by the interval setting, and when the optical module has the SD signal output, the optical power of the optical network unit is detected twice, and it can be determined whether the optical network unit is faulty, as shown in FIG. 3, the setting duration is set.
  • t must be greater than t1 and less than t2-tl, that is, set the duration
  • the duration of the range is greater than the duration of one illuminating time slot and is less than the time interval of the normal illuminating of the optical network unit twice, so that not only the optical power of the optical module can be read twice in one illuminating time slot, but also It is ensured that the transmitted optical power of the optical module is not read in two consecutive normal time slots.
  • the transmitted optical power of the optical module is read twice in the range of the set duration, the light is indicated.
  • the module is in a long-light state, that is, the optical network unit is faulty.
  • the transmission power of the optical module can be cut off to avoid affecting other optical network units that are working normally.
  • the embodiment of the present invention provides a method for controlling an ONU, where the main CPU of the optical network unit is in a time interval greater than one illuminating time slot and less than a time interval in which the optical network unit continuously emits light twice, if The optical power of the optical module can be read twice, and the abnormality of the optical module is determined, and the sending power of the optical module is cut off;
  • the main CPU can also determine whether the optical module is abnormal by detecting the pulse width of the illumination control signal, and when the optical module is abnormal. Cutting off the transmission power of the optical module; wherein, the illumination control signal is a signal that the optical network unit controls the illumination of the optical module, that is, a signal sent by the main CPU for controlling the illumination of the optical module;
  • the main CPU can also control whether to cut off the transmission power of the optical module by determining whether the illumination control signal is the same as the illumination indication signal sent by the optical module.
  • the illumination indication signal is a signal output by the optical module indicating that it is emitting light.
  • a method for controlling an ONU includes:
  • Step 201 The main CPU determines whether the ONU starts the long-light detection function. If it is started, it performs step 202, otherwise it continues to determine whether the long-light detection function is activated. If it is not activated, it is periodically determined whether the optical network unit starts the long illuminating detection function.
  • the specific fault detection period can be set according to the actual situation.
  • Step 202 The main CPU determines whether the sending power of the optical module is turned on. If yes, step 203 is performed. If not, step 201 is performed;
  • Step 203 The main CPU determines whether the optical module has an SD (Signal Detection) signal output. If there is an SD signal output, step 204 is performed. If no SD signal is output, the process returns directly to step 201;
  • SD Signal Detection
  • the optical module does not have an SD signal output, it indicates that the optical module is not inserted into the optical fiber or the optical fiber is damaged. At this time, the other ONUs are not affected, so there is no need for processing, and the process returns directly to step 201;
  • Step 204 The main CPU reads the transmit optical power of the optical module twice.
  • the time interval between the two read operations is the set duration. If the transmit optical power can be read twice, the optical module is long.
  • the first value range of the set duration is greater than the duration of one of the optical network units of the optical network unit, and is less than the time interval during which the optical network unit normally emits light twice.
  • Step 205 The main CPU detects a pulse width of the illumination control signal.
  • This step mainly acquires the pulse width of the illumination control signal through a multi-bit counter.
  • the multi-bit counter Clearing and starting counting, the multi-bit counter counting ends at the end of the pulse, and then the pulse width of the illumination control signal is obtained by multiplying the count value by the counting clock period;
  • Step 206 Determine whether the pulse width of the illumination control signal is within a second value range. If the pulse width is within the second value range, perform step 207, if the pulse width is not within the second value range. , step 208 is performed; Wherein, when the pulse width of the illumination control signal is not within the second value range, indicating that
  • the ONU is faulty. Therefore, you need to cut off the transmit power of the optical module.
  • the second value range is greater than 0 and less than the length of time that the central office device allocates to one of the optical network slots of the optical network unit. Therefore, when the pulse width of the illumination control signal is not within the second value range, that is, when the pulse width is greater than t1 or 0, this indicates that the control signal is not controlled by the central office device, and thus the ONU is faulty. ;
  • Step 207 The main CPU determines whether the illumination control signal is the same as the illumination indication signal sent by the optical module. If the two are the same, it indicates that the ONU is normal at this time, and returns to step 201 to restart the periodic fault detection; if the illumination indication signal is If the ONU is abnormal, that is, the ONU is faulty, go to step 208;
  • the embodiment may detect whether the illumination control signal and the illumination indication signal are the same through an AND gate circuit, that is, the main CPU sends out The illumination control signal and the illumination indication signal sent by the optical module are input to the same OR gate circuit. If the output is high level, the two are the same; if the low level is output, the two are different;
  • the reverse adjustment may be first performed to make the two are the same, and then whether the two are the same.
  • Step 208 The main CPU cuts off the transmission power of the optical module, and returns to step 201.
  • the embodiment of the present invention further provides a fault detection method for the optical network unit.
  • the step 208 is not necessary, and in step 204, step 206, and step 207, when the optical network unit is detected to be faulty, Can end directly, or return to step 201 to continue Periodic fault detection. In this way, the optical network unit can automatically detect the fault.
  • the optical network unit includes the main CPU and the optical module, and the main CPU is provided in the embodiment of the present invention.
  • the method is: when determining that the optical module has the signal detection SD signal output, reading the transmission optical power of the optical module twice, and when the transmission optical power can be read twice, determining that the optical network unit is faulty;
  • the time interval between the two read operations is a set duration, and the first value range of the set duration is greater than the duration of one of the optical network slots of the optical network unit and is smaller than the continuous duration of the optical network unit.
  • the time interval between two normal illuminations is a set duration, and the first value range of the set duration is greater than the duration of one of the optical network slots of the optical network unit and is smaller than the continuous duration of the optical network unit.
  • the main CPU includes: a transmit optical power reading module 61, configured to read the transmit optical power of the optical module twice in two steps when determining that the optical module has an SD signal output, wherein the read optical power is read twice. The time interval between them is the set time;
  • the fault determining module 62 is configured to determine that the optical network unit is faulty when the transmit optical power can be read twice, and the first value range of the set duration is greater than the duration of one illuminating time slot of the optical network unit. And less than the time interval in which the optical network unit continuously emits light twice.
  • the main CPU further includes:
  • the pulse width detecting module 63 is configured to detect a pulse width of the light emission control signal when only one transmission optical power is read or not, and the light emission control signal is controlled by the optical network unit. The signal that the light module emits light.
  • the fault determining module 62 is further configured to: determine whether the pulse width is within a second value range, and determine that the optical network unit is faulty when the pulse width of the light emission control signal is not within the second value range, and the second value
  • the range is greater than 0 and less than the length of one of the light-emitting time slots of the optical network unit.
  • the fault determining module 62 is further configured to: determine, when the pulse width of the light emission control signal is within the second value range, whether the light emitting control signal and the light emitting indication signal sent by the optical module are Similarly, when it is determined that the illumination control signal is different from the illumination indication signal sent by the optical module, it is determined that the optical network unit is faulty.
  • the embodiment of the present invention further provides an optical network unit that uses the foregoing control method.
  • the optical network unit includes: a main CPU and an optical module; and the main CPU is configured to: When the signal detection SD signal is output, the transmission optical power of the optical module is read twice, and when the transmission optical power can be read twice, it is determined that the optical network unit is faulty;
  • the time interval between the two read operations is a set duration, and the first value range of the set duration is greater than the duration of one of the optical network slots of the optical network unit and is smaller than the continuous duration of the optical network unit.
  • the time interval between two normal illuminations is a set duration, and the first value range of the set duration is greater than the duration of one of the optical network slots of the optical network unit and is smaller than the continuous duration of the optical network unit.
  • the main CPU includes:
  • the transmitting optical power reading module 71 is configured to read the transmitting optical power of the optical module twice when the optical module has the SD signal output, wherein the time interval between the two readings is a set duration;
  • the control module 72 is configured to: when determining that the optical network unit is faulty, cut off the sending power of the optical module, where the first value range of the set duration is greater than a duration of one illuminating time slot of the optical network unit and less than the light The time interval during which the network unit is normally illuminated twice.
  • the main CPU further includes:
  • the pulse width detecting module 73 is configured to detect a pulse width of the light emitting control signal when the optical power is read only once or not, or when the transmitting optical power is not read twice;
  • the control module 72 is further configured to cut off the transmission power of the optical module when the pulse width of the illumination control signal is not within the second value range, where the second value range is greater than 0 and less than the duration of one illumination slot of the optical network unit. .
  • the control module 72 is further configured to: determine, when the pulse width of the illumination control signal is within the second value range, whether the illumination control signal is the same as the illumination indication signal sent by the optical module, and At the same time, the transmission power of the optical module is cut off.

Abstract

La présente invention se rapporte à un réseau optique passif (PON), divulgue de façon précise une unité de réseau optique et un procédé de détection et de commande de défaillance de cette dernière et améliore la capacité de détection de défaillance de l'unité de réseau optique. Le procédé de détection de défaillance dans l'unité de réseau optique consiste à : lire deux fois la puissance optique de transmission d'un module optique lorsqu'un signal de détection de signal (SD) est délivré depuis le module optique, l'intervalle entre les deux opérations de lecture étant une période de temps déterminée; déterminer qu'une défaillance se produit dans l'unité de réseau optique lorsqu'une valeur de puissance optique de transmission est lue à ces deux moments, la plage de valeurs de la période de temps déterminée étant plus importante que la période de temps d'un intervalle de temps d'éclairage de l'unité de réseau optique et inférieure à l'intervalle entre deux éclairages naturels continus de l'unité de réseau optique. En outre, la présente invention peut également commander l'unité de réseau optique en coupant la puissance de transmission du module optique. Par conséquent, la présente invention peut améliorer la capacité de détection de défaillance de l'unité de réseau optique et éviter l'effet d'une unité de réseau optique (ONU) défectueuse sur d'autres unités ONU normales en coupant la puissance de transmission du module optique.
PCT/CN2010/077420 2009-12-09 2010-09-28 Unité de réseau optique et procédé de détection et de contrôle de défaillance de cette dernière WO2011069386A1 (fr)

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Application Number Priority Date Filing Date Title
CN 200910252446 CN101710847A (zh) 2009-12-09 2009-12-09 光网络单元的故障检测、控制方法和光网络单元
CN200910252446.2 2009-12-09

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US20230163873A1 (en) * 2021-11-25 2023-05-25 Mitsubishi Electric Corporation Station-side device, optical communication system, and search method
US11916659B2 (en) * 2021-11-25 2024-02-27 Mitsubishi Electric Corporation Station-side device, optical communication system, and search method

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