WO2023202446A1 - 信号传输方法、光网络单元和光线路终端 - Google Patents

信号传输方法、光网络单元和光线路终端 Download PDF

Info

Publication number
WO2023202446A1
WO2023202446A1 PCT/CN2023/087880 CN2023087880W WO2023202446A1 WO 2023202446 A1 WO2023202446 A1 WO 2023202446A1 CN 2023087880 W CN2023087880 W CN 2023087880W WO 2023202446 A1 WO2023202446 A1 WO 2023202446A1
Authority
WO
WIPO (PCT)
Prior art keywords
olt
onu
signal
downlink
uplink
Prior art date
Application number
PCT/CN2023/087880
Other languages
English (en)
French (fr)
Inventor
张伟良
张海军
袁立权
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2023202446A1 publication Critical patent/WO2023202446A1/zh

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems

Definitions

  • the present application relates to the field of communication technology, and in particular to a signal transmission method, an optical network unit and an optical line terminal.
  • FTTR Fiber To The Room
  • fiber to the home optical network unit (Fibre To The Home Optical Network Unit, FTTH ONU) and fiber to the room optical line terminal (Fiber To The Room Optical Line Terminal, FTTR OLT) are usually integrated into one device , and is called the main gateway.
  • the main gateway has an uplink optical port and a downlink optical port.
  • the main gateway When the main gateway is connected to the FTTH OLT through the uplink optical port, it works according to the FTTH ONU; when the main gateway is connected to the FTTR ONU through the downlink optical port, it works according to the FTTR OLT.
  • this setting method may cause misoperation.
  • the downlink optical port of the FTTR main gateway is used as the uplink optical port to connect to the FTTH, causing the FTTR main gateway's downlink optical port to be connected to the FTTH.
  • the uplink wavelength is the same as the downlink wavelength of FTTH, which will affect the operation of the downlink wavelength of FTTH, causing the FTTH ONU to receive bit errors, and even fail to work properly and cause it to go offline.
  • Embodiments of the present application provide a signal transmission method, an optical network unit and an optical line terminal.
  • the signal transmission method can avoid the impact on the downlink wavelength of the main gateway's uplink passive optical network when the downlink optical port of the main gateway is connected incorrectly.
  • embodiments of the present application provide a signal transmission method applied to an optical network unit ONU.
  • the method includes:
  • an uplink detection signal is sent to the OLT.
  • embodiments of the present application provide a signal transmission method applied to optical line terminal OLT.
  • the method includes:
  • the optical network unit ONU When receiving the uplink detection signal of the optical network unit ONU, it sends a downlink signal to the ONU.
  • an optical network unit ONU including:
  • the first sending module is configured to send an uplink detection signal to the OLT when the downlink signal of the optical line terminal OLT is not received.
  • an optical line terminal OLT including:
  • the second sending module is used to keep the downlink signal off after power on until the uplink detection signal of the optical network unit ONU is received; and when the uplink detection signal of the optical network unit ONU is received, send the downlink signal to the ONU.
  • embodiments of the present application provide an optical network system, including an optical line terminal OLT and an optical network unit ONU, wherein,
  • the ONU includes a first sending module, configured to send an uplink detection signal to the OLT when the downlink signal of the optical line terminal OLT is not received;
  • the OLT includes a second sending module for powering on and detecting the uplink detection signal of the optical network unit ONU; and when receiving the uplink detection signal of the optical network unit ONU, sending a downlink signal to the ONU.
  • an optical network unit ONU including:
  • Program instructions are stored on the memory, and when executed by the processor, the program instructions cause the processor to perform the signal transmission method described in any one of the above first aspects.
  • embodiments of the present application provide an optical network system, including an optical line terminal OLT and an optical network unit ONU, wherein,
  • the ONU includes a first sending module, configured to send an uplink detection signal to the OLT when the downlink signal of the optical line terminal OLT is not received;
  • the OLT includes a second sending module for powering on and detecting the uplink detection signal of the optical network unit ONU; and when receiving the uplink detection signal of the optical network unit ONU, sending a downlink signal to the ONU.
  • embodiments of the present application provide an optical line terminal OLT, including:
  • Program instructions are stored on the memory, and when executed by the processor, the program instructions cause the processor to perform the signal transmission method described in any one of the second aspects above.
  • embodiments of the present application provide a computer-readable storage medium that stores program instructions.
  • the program instructions are executed by a computer, the signal transmission method as described in any one of the first aspect above is implemented, or the signal transmission method as described in the first aspect is implemented.
  • the signal transmission method according to any one of the two aspects.
  • the ONU after the ONU is powered on, it sends an uplink detection signal to the OLT without receiving the downlink signal from the OLT, so that the OLT in the downlink signal-off state starts to send the uplink detection signal to the ONU after receiving the uplink detection signal.
  • Send downlink signal after the OLT is powered on, the downlink signal is first turned off. When the uplink detection signal sent by the ONU is not received, the downlink signal is not sent to the ONU, which can effectively save the energy consumption of the equipment in the passive optical network.
  • the ONU the active status of sending uplink detection signals to the OLT, it can effectively avoid the impact on the downlink wavelength of the main gateway's uplink passive optical network when the downlink optical port of the main gateway is connected incorrectly.
  • Figure 1 is a schematic diagram of the connection between the main gateway, ONU and OLT in practical applications
  • Figure 2 is a first interactive schematic diagram of a signal transmission method provided by an embodiment of the present application.
  • Figure 3 is a schematic flowchart of the steps of the traditional activation process between ONU and OLT;
  • Figure 4 is a schematic flowchart of steps combined with the traditional activation process provided by the embodiment of the present application.
  • Figure 5 is a schematic flowchart of a signal transmission method provided by an embodiment of the present application applied to an OLT;
  • Figure 6 is a second interactive schematic diagram of a signal transmission method provided by an embodiment of the present application.
  • Figure 7 is a third interactive schematic diagram of a signal transmission method provided by an embodiment of the present application.
  • Figure 8 is a fourth interactive schematic diagram of a signal transmission method provided by an embodiment of the present application.
  • Figure 9 is a fifth interactive schematic diagram of a signal transmission method provided by an embodiment of the present application.
  • Figure 10 is a schematic diagram of the equipment structure of the optical network unit ONU provided by the embodiment of the present application.
  • Figure 11 is a schematic diagram of the equipment structure of the optical line terminal OLT provided by the embodiment of the present application.
  • At least one of the following and similar expressions refers to any group of these items, including any group of singular or plural items.
  • at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or, a and b and c, where a, b, c can be a single , or multiple.
  • FTTR Fiber To The Room
  • fiber to the home optical network unit (Fibre To The Home Optical Network Unit, FTTH ONU) and fiber to the room optical line terminal (Fiber To The Room Optical Line Terminal, FTTR OLT) are usually integrated into one device , and is called the main gateway.
  • the main gateway has an uplink optical port and a downlink optical port.
  • the main gateway is connected to the access network optical line terminal (Optical Line Terminal, OLT) through the uplink optical port.
  • OLT access network optical network unit
  • the main gateway is connected to the home network ONU through the downlink optical port, and works according to the home network OLT.
  • this setting method may cause misoperation.
  • the downlink optical port of the FTTR main gateway is used as the uplink optical port to connect to the FTTH, causing the FTTR main gateway's downlink optical port to be connected to the FTTH.
  • the uplink wavelength is the same as the downlink wavelength of FTTH, which will affect the operation of the downlink wavelength of FTTH, causing the FTTH ONU to receive bit errors, and even fail to work properly and cause it to go offline.
  • FTTR refers to the laying of optical fiber into the room, which is a basic technical method for optical fiber access.
  • Fiber To The Build FTTB
  • FTTC Fiber To The Curb
  • fiber optic to small Zone FTTZ
  • FTTH bus type
  • ring star or tree topology
  • Passive Optical Network It is a point-to-multipoint optical fiber transmission and access technology. It adopts broadcast mode for downlink and time division multiple access mode for uplink. It can flexibly form tree, star and bus. It has the advantages of saving optical cable resources, sharing bandwidth resources, saving computer room investment, fast network construction speed, and low comprehensive network construction cost.
  • OLT It is the core component of the optical access network, equivalent to the switch or router in the traditional communication network, and is also a multi-service providing platform. Generally used to provide fiber optic interfaces for user-oriented passive fiber optic networks. The functions include: uplinking to the upper-layer network, completing the uplink access to the PON network, and connecting down to the user-side equipment ONU through the optical distribution network (Optical Distribution Network, ODN) to realize the control, management and ranging functions of the user-side equipment ONU.
  • ODN optical Distribution Network
  • ONU divided into active optical network unit and passive optical network unit.
  • equipment equipped with network monitoring devices including optical receivers, uplink optical transmitters, and multiple bridge amplifiers are called optical nodes.
  • the PON uses a single optical fiber to connect to the OLT, and then the OLT connects to the ONU.
  • ONU provides data, interactive Internet TV, voice and other services.
  • PLOAM message Physical Layer Operation Administration and Maintenance, PLOAM message
  • PLOAM message can be broadcast or unicast.
  • the main functions provided by this message are: upstream Burst configuration and ONU activation , ONU registration, encryption key update, exchange of protection switch signals, power management, etc.
  • embodiments of the present application provide a signal transmission method, an optical network unit and an optical line terminal.
  • the signal transmission method can avoid the impact on the FTTH downlink wavelength when the downlink optical port of the FTTR main gateway is connected incorrectly.
  • GSM Global System for Mobile Communications
  • UMTS Universal Mobile Telecommunications System
  • HSPA High Speed Packet Access
  • LTE Long Term Evolution
  • 5G fifth generation
  • FIG. 2 it is a schematic flow chart of applying a signal transmission method provided by an embodiment of the present application to an optical network unit ONU.
  • the implementation process of this method when applied to the optical network unit ONU includes but is not limited to step S110.
  • Step S110 When no downlink signal from the optical line terminal OLT is received, an uplink detection signal is sent to the OLT.
  • the ONU can only emit light and send uplink frames under the instruction of the OLT.
  • the signal transmission method described in the embodiment of the present application initially stage, giving ONU an active position in PON. First, it is judged whether the ONU has received the downlink signal sent by the OLT. If the ONU does not receive the downlink signal sent by the OLT, it attempts to send a short signal. Specifically, the ONU first sends an uplink detection signal to the OLT.
  • the signal transmission method applied to ONU in the embodiment of the present application can be applied when ONU and OLT perform the network activation process. That is, when the ONU is powered on, when the ONU does not receive the downlink signal of the OLT, it sends an uplink signal to the OLT. Detection signal, so that the OLT in the downlink signal off state starts to send downlink signals to the ONU after receiving the uplink detection signal, thereby avoiding the damage to the downlink wavelength of the uplink passive optical network of the main gateway when the downlink optical port of the main gateway is connected incorrectly. Influence. After the activation process, the OLT and ONU follow the traditional communication process, that is, sending downlink signals to the ONU through the OLT, and the ONU sends uplink signals under the control of the OLT.
  • the OLT and the ONU do not During mutual interaction, the ONU does not obtain the downlink clock from the OLT. When it does not receive the downlink signal from the OLT, the ONU uses the local clock to send the uplink detection signal to the OLT.
  • the uplink detection signal sent by the ONU can use the default guard time, preamble, delimiter and other uplink detection signal parameters.
  • the OLT also uses the default guard time, preamble, delimiter and other uplink detection signal parameters to restore and restore the uplink detection signal. Read. However, this application is not limited to using only the default uplink detection signal parameters.
  • the process of the ONU sending the uplink detection signal to the OLT specifically includes: when the ONU does not receive the downlink signal from the OLT within the first time after the ONU is powered on, sending the uplink detection signal to the OLT.
  • the signal transmission method in the embodiment of the present application can also be applied to the network activation process and subsequent communication process between the ONU and the OLT. Specifically, when the ONU is powered on, when the ONU does not receive the downlink signal of the OLT. , then sends an uplink detection signal to the OLT. When the ONU does not receive the downlink signal from the OLT within the first time after powering on, the ONU sends an uplink detection signal to the OLT, so that the OLT in the downlink signal off state receives the uplink detection signal. After that, it starts sending downlink signals to this ONU. By giving the ONU the active status of sending uplink detection signals to the OLT, the embodiment of the present application can effectively avoid the impact on the downlink wavelength of the main gateway's uplink passive optical network when the downlink optical port of the main gateway is connected incorrectly.
  • the implementation process of the signal transmission method provided by the embodiments of the present application when applied to the optical network unit ONU also includes but is not limited to at least one of step S120 and step S130.
  • Step S120 When the ONU receives the downlink signal from the OLT within the first time after powering on, cancel sending the uplink detection signal to the OLT.
  • the signal transmission method applied to the ONU in the embodiment of the present application can be applied when the ONU and the OLT perform the network activation process. That is, when the ONU is powered on and does not receive the downlink signal of the OLT, it sends a signal to the OLT.
  • the uplink detection signal causes the OLT in the downlink signal off state to start sending downlink signals to the ONU after receiving the uplink detection signal, and when the downlink signal from the OLT is received within the first time after the ONU is powered on, the OLT cancels the downlink signal. Send an uplink detection signal.
  • the OLT and ONU follow the traditional communication process, that is, send a downlink signal to the ONU through the OLT, and the ONU sends an uplink detection signal under the control of the OLT, thus preventing the main gateway from being damaged when the downlink optical port of the main gateway is connected incorrectly.
  • the impact of the downlink wavelength of the uplink passive optical network is not limited to, but not limited to, but not limited to, but not limited to, but not limited to the OLT.
  • Step S130 Detect the downlink signal of the OLT within the first time after the ONU is powered on; wherein the downlink signal includes at least one of the following: a downlink frame and a downlink optical signal.
  • the ONU when the ONU is powered on and does not receive the downlink signal from the OLT, it sends an uplink detection signal to the OLT, so that the OLT in the downlink signal off state starts sending downlink signals to the ONU after receiving the uplink detection signal. .
  • the ONU detects the downlink signal of the OLT within the first time after it is powered on. When receiving the OLT's downlink frame and/or downlink optical signal, the ONU cancels sending the uplink detection signal to the OLT.
  • the OLT and ONU follow the traditional communication process, that is, sending downlink signals to the ONU through the OLT, and the ONU sends uplink detection signals under the control of the OLT, thus avoiding damage to the uplink passive optical network of the main gateway when the downlink optical port of the main gateway is connected incorrectly.
  • the impact of downstream wavelengths is, sending downlink signals to the ONU through the OLT, and the ONU sends uplink detection signals under the control of the OLT, thus avoiding damage to the uplink passive optical network of the main gateway when the downlink optical port of the main gateway is connected incorrectly. The impact of downstream wavelengths.
  • the downlink frames sent by the OLT to the ONU include: sending downlink superframes, opening quiet windows, etc.
  • the downlink optical signal sent by the ONU includes sending a serial number request message (Serial Number, SN request message), etc., after the OLT sends the downlink frame and/or downlink optical signal, or after the ONU receives the OLT's downlink frame and/or downlink optical signal.
  • the OLT and ONU use the traditional activation process to activate the ONU.
  • the ONU After the ONU is successfully activated, the ONU sends a downlink signal to the ONU through the OLT, and the ONU sends an uplink detection signal under the control of the OLT.
  • the ONU in traditional PON, the ONU is in a passive position, that is, the OLT first sends downlink optical signals and/or downlink frames to the ONU as soon as it is powered on, and the ONU must be controlled by the instructions of the OLT before it can send the corresponding uplink optical signals. and/or uplink frames.
  • the traditional activation process between ONU and OLT includes but is not limited to step S311 to step S317.
  • Step S311 the OLT sends the downlink frame to the ONU;
  • Step S312 the OLT sends an SN request message to the ONU;
  • Step S313 the ONU sends the corresponding SN response to the OLT according to the received SN request message;
  • Step S314 the OLT allocates the corresponding ONU-ID to the ONU according to the received SN response;
  • Step S315 the OLT sends a ranging request to the ONU;
  • Step S316 The ONU sends a corresponding ranging response to the OLT according to the received ranging request;
  • Step S317 The OLT returns the ranging result to the ONU.
  • the OLT is powered on before the traditional activation process. After that, it is first detected whether the uplink detection signal sent by the ONU is received.
  • the specific activation process includes but is not limited to step S411 to step S418.
  • Step S411 the OLT detects whether it receives the uplink detection signal sent by the ONU;
  • Step S412 After receiving the uplink detection signal sent by the ONU, the OLT sends the downlink frame to the ONU;
  • Step S413 the OLT sends an SN request message to the ONU;
  • Step S414 the ONU sends the corresponding SN response to the OLT according to the received SN request message;
  • Step S415 the OLT allocates the corresponding ONU-ID to the ONU according to the received SN response
  • Step S417 the ONU sends a corresponding ranging response to the OLT according to the received ranging request;
  • Step S418 The OLT returns the ranging result to the ONU.
  • the OLT also stops working or enters the energy-saving state and stops sending downlink signals.
  • both the OLT and the ONU enter the initial state.
  • the OLT and ONU After the OLT is powered on, it first detects whether it has received the uplink detection signal sent by the ONU. After the ONU is powered on, if it does not receive the downlink signal from the optical line terminal OLT, it sends an uplink detection signal to the OLT. . After the ONU receives the downlink frame and/or downlink optical signal from the OLT, the OLT and ONU use the traditional activation process to activate the ONU. After the ONU is successfully activated, it sends a downlink signal to the ONU through the OLT. The ONU is under the control of the OLT. Send uplink detection signal down.
  • the process of detecting the downlink signal of the OLT within the first time after the ONU is powered on may specifically include: detecting the downlink frame of the OLT within the first time after the ONU is powered on. When the OLT downlink frame is detected, Make sure that the downlink signal from the OLT is received within the first time after the ONU is powered on.
  • the OLT's downlink frame is detected within the first time after the ONU is powered on.
  • the OLT downlink frame is detected, it is determined that the ONU is powered on at the first After receiving the downlink signal from the OLT within a certain period of time, the ONU cancels sending the uplink detection signal to the OLT.
  • the process of detecting the downlink signal of the OLT within the first time after the ONU is powered on may further include: detecting the SD (Signal Detect) signal within the first time after the ONU is powered on. SD letter detected number, confirming that the ONU receives the downlink signal from the OLT within the first time after powering on, where the SD signal is generated by the ONU after receiving the downlink optical signal from the OLT.
  • SD Signal Detect
  • the ONU when the ONU is powered on and does not receive the downlink signal from the OLT, it will detect whether the downlink optical signal of the OLT generates an SD signal within the first time after the ONU is powered on. When the SD signal is detected, it is determined that the ONU If the downlink signal from the OLT is received within the first time after power-on, the uplink detection signal will be canceled to the OLT.
  • a signal transmission method when the downlink signal of the OLT is received within the first time after the ONU is powered on, a signal transmission method provided by the embodiment of the present application also includes but is not limited to at least one of the following:
  • the uplink detection signal is sent to the OLT, where the received downlink signal of the OLT can be the bandwidth allocation message sent by the OLT. , and/or the PLOAM message sent by the OLT, and/or the SN request message sent by the OLT.
  • the OLT and the ONU follow the traditional communication process, that is, send the downlink signal to the ONU through the OLT, and the ONU sends the uplink signal under the control of the OLT.
  • the uplink detection signal sent by the ONU can be a known PLOAM message or a newly defined PLOAM message.
  • the signal transmission method provided by the embodiment of the present application is applied to an ONU, and the uplink detection signal includes at least one of the following: uplink frame, uplink optical signal.
  • the uplink frame and/or uplink optical signal is sent to the OLT.
  • the downlink signal from the OLT is received within the first time after the ONU is powered on, Cancel sending uplink frames and/or uplink optical signals to the OLT.
  • the OLT and ONU follow the traditional communication process, that is, sending downlink signals to the ONU through the OLT, and the ONU sends uplink frames and/or uplink optical signals under the control of the OLT, thereby avoiding the uplink to the main gateway when the downlink optical port of the main gateway is connected incorrectly.
  • the impact of downstream wavelengths in passive optical networks is not received, the uplink frame and/or uplink optical signal is sent to the OLT.
  • the signal transmission method provided by the embodiment of the present application further includes step S140 when applied to the ONU.
  • Step S140 When receiving the downlink signal sent by the OLT based on the uplink detection signal, stop sending the uplink detection signal to the OLT.
  • the uplink detection signal is sent to the OLT.
  • the uplink signal is stopped to be sent to the OLT. Detect the signal and enter the traditional activation process.
  • the OLT and ONU follow the traditional communication process, that is, sending downlink signals to the ONU through the OLT, and the ONU sends uplink frames and/or uplink optical signals under the control of the OLT, thereby avoiding the failure of the main gateway when the downlink optical port is connected incorrectly.
  • the impact of the downlink wavelength of the uplink passive optical network is not received within the first time after the ONU is powered on.
  • the implementation process of applying the signal transmission method provided by the embodiment of the present application to the ONU further includes step S150.
  • Step S150 When the downlink signal from the OLT is not received within the second time after sending the uplink detection signal, continue to send the uplink detection signal to the OLT.
  • the signal transmission method applied to the ONU in the embodiment of the present application can be applied when the ONU and the OLT perform the network activation process, and can also be applied on the basis of the existing activation mechanism.
  • the uplink detection signal is sent to the OLT.
  • the uplink detection signal is continued to be sent to the OLT. signal, and continuously detects whether the current ONU receives the downlink signal sent by the OLT, until the ONU stops sending when it receives the downlink signal sent by the OLT.
  • downlink signals are sent to the ONU through the OLT, and the ONU sends uplink frames and/or uplink optical signals under the control of the OLT, thus avoiding the impact on the downlink wavelength of the uplink passive optical network of the main gateway when the downlink optical port of the main gateway is incorrectly connected. Influence.
  • the length of the above-mentioned second time is not specifically limited and can be set according to actual needs.
  • FIG. 5 it is a schematic flow chart of applying a signal transmission method to an OLT according to an embodiment of the present application.
  • the implementation process of this method when applied to the optical line terminal OLT includes but is not limited to step S510 and step S520.
  • Step S510 After powering on, the downlink signal is kept turned off until the uplink detection signal of the optical network unit ONU is received.
  • the OLT After the OLT is powered on, it first keeps the downlink signal off, that is, it detects whether the current OLT receives the uplink detection signal of the ONU. When the uplink detection signal of the ONU is not detected, the downlink signal of the OLT remains off until it receives the uplink detection signal. Uplink detection signal to ONU.
  • Step S520 When receiving the uplink detection signal of the optical network unit ONU, send a downlink signal to the ONU.
  • the OLT detects that it has received the uplink detection signal of the ONU, it turns on the function of sending downlink signals and sends downlink signals to the ONU.
  • the ONU sends uplink optical signals under the control of the OLT, thereby avoiding the downlink optical port connection of the main gateway. The impact of timing errors on the downlink wavelength of the main gateway's uplink passive optical network.
  • the downlink signals sent by the OLT to the ONU include downlink frames and/or downlink optical signals.
  • the downlink frames include: sending downlink superframes, SN request messages, etc.
  • the downlink optical signals can be optical signals without special meaning.
  • the ONU After receiving the downlink frame and/or downlink optical signal from the OLT, the ONU is activated using the traditional activation process. After successful activation, the downlink signal is sent to the ONU through the OLT, and the ONU sends the uplink signal under the control of the OLT.
  • the uplink detection signal when a signal transmission method provided by embodiments of the present application is applied to an OLT, includes at least one of the following: uplink frame, uplink optical signal.
  • the OLT after the OLT is powered on, it first keeps the downlink signal off, that is, it detects whether the current OLT receives the uplink frame and/or uplink optical signal of the ONU. When the uplink frame and/or uplink optical signal of the ONU is not detected, The OLT's downstream signal remains off until the ONU's upstream frame and/or upstream optical signal is received. After that, the OLT and ONU follow the traditional communication process, that is, sending downlink signals to the ONU through the OLT, and the ONU sends uplink frames and/or uplink optical signals under the control of the OLT, thereby avoiding the uplink to the main gateway when the downlink optical port of the main gateway is connected incorrectly. The impact of downstream wavelengths in passive optical networks.
  • a signal transmission method provided by the embodiment of the present application is applied to an OLT.
  • the method also includes but is not limited to at least one of step S530 and step S540.
  • Step S530 Detect the uplink frame of the ONU.
  • the uplink frame of the ONU is detected, it is determined that the uplink detection signal of the ONU is received.
  • the OLT when the OLT is powered on, it keeps the downlink signal off and detects whether the current OLT has received the uplink frame of the ONU.
  • the uplink frame of the ONU When the uplink frame of the ONU is detected and it is determined that the uplink detection signal of the ONU has been received, it starts sending to the ONU.
  • the OLT and ONU After the traditional activation process is used to activate the OLT and ONU, the OLT and ONU send downlink signals to the ONU through the OLT according to the traditional communication process.
  • the ONU sends uplink detection signals under the control of the OLT, thus avoiding the downlink connection of the main gateway.
  • Step S540 detect the SD signal.
  • the SD signal is detected, it is determined that the uplink detection signal of the ONU is received.
  • the SD signal is generated by the OLT after receiving the uplink optical signal from the ONU.
  • the downlink signal is kept turned off, and the SD signal generated when the current OLT receives the uplink optical signal of the ONU is detected.
  • the SD signal is detected, it is determined that the uplink detection signal of the ONU is received, then Start sending downlink signals to ONU.
  • the OLT and ONU After the OLT and ONU are activated using the traditional activation process, the OLT and ONU follow the traditional communication process and send downlink signals to the ONU through the OLT.
  • the ONU sends uplink signals under the control of the OLT, thereby avoiding The impact on the downlink wavelength of the uplink passive optical network of the main gateway when the downlink optical port of the main gateway is connected incorrectly.
  • a signal transmission method when the downlink signal of the OLT is received within the first time after the ONU is powered on, a signal transmission method provided by the embodiment of the present application also includes but is not limited to at least one of the following:
  • the OLT when receiving the uplink detection signal of the ONU, the OLT sends a downlink signal to the ONU.
  • a signal transmission method provided by the embodiment of the present application includes but is not limited to at least one of the following:
  • the OLT After the OLT is powered on, it first keeps the downlink signal off, that is, it detects whether the current OLT receives the uplink detection signal of the ONU. When the uplink detection signal of the ONU is not detected, the downlink signal of the OLT remains off until The uplink detection signal of the ONU is received. When the OLT detects that it has received the uplink detection signal of the ONU, it starts the function of sending downlink signals.
  • the downlink signals sent by the OLT include at least one of the following: downlink frames, downlink optical signals, bandwidth allocation messages, PLOAM messages, and SN request messages. .
  • the ONU By sending downlink signals to the ONU, the ONU sends uplink detection optical signals for network communication under the control of the OLT, thus avoiding the impact on the downlink wavelength of the uplink passive optical network of the main gateway when the downlink optical port of the main gateway is connected incorrectly.
  • the PLOAM message sent by the OLT can be a known PLOAM message or a newly defined PLOAM message.
  • the signal transmission method in this embodiment of the present application includes steps S611 to S618:
  • Step S611 After the ONU is powered on, it detects whether it has received the downlink frame sent by the OLT. If it is determined that the downlink frame from the OLT has not been received within the first time after the ONU is powered on, it sends the uplink frame to the OLT. Otherwise, step S612 is executed;
  • Step S612 When it is determined that the downlink frame of the OLT has been received within the first time after the ONU is powered on, the sending of the uplink frame to the OLT is cancelled, and step S615 is started;
  • Step S613 When it is determined that the downlink frame sent by the OLT is not received within the second time after the uplink frame is sent, continue to send the uplink frame to the OLT;
  • Step S614 When it is determined that the downlink frame sent by the OLT according to the uplink frame is received, stop sending the uplink frame to the OLT;
  • Step S615, enter the traditional activation process
  • Step S616 When the OLT is powered on, it first keeps the downlink frame closed and detects whether the uplink frame sent by the ONU is received;
  • Step S617 When receiving the uplink frame of the ONU, send the downlink frame to the ONU; otherwise, execute step S618;
  • Step S618 When the uplink frame of the ONU is not received, the signal detection of the uplink frame of the ONU is maintained until the uplink frame sent by the ONU is received, and the downlink frame is sent to the ONU.
  • the ONU determines that it has not received the downlink frame sent by the OLT within the second time after sending the uplink frame, the ONU continues to send the uplink frame to the OLT and continues to detect whether the current ONU has received the downlink frame sent by the OLT. frame, straight When the ONU receives the downlink frame sent by the OLT, the ONU stops sending uplink frames to the OLT.
  • the signal transmission method in this embodiment of the present application includes steps S711 to S718:
  • Step S711 After the ONU is powered on, it detects whether it has received the downlink optical signal sent by the OLT. If it is determined that the downlink optical signal from the OLT has not been received within the first time after the ONU is powered on, it sends an uplink frame to the OLT. Otherwise, step S712 is executed. ;
  • Step S712 when it is determined that the downlink optical signal sent by the OLT is received within the first time after the ONU is powered on, cancel sending the uplink frame to the OLT, and start executing step S715;
  • Step S713 when it is determined that the downlink optical signal sent by the OLT is not received within the second time after the uplink frame is sent, continue to send the uplink frame to the OLT;
  • Step S714 When it is determined that the downlink optical signal sent by the OLT according to the uplink frame is received, stop sending the uplink frame to the OLT;
  • Step S715, enter the traditional activation process
  • Step S716 When the OLT is powered on, it first keeps the downlink optical signal off and detects whether the uplink frame sent by the ONU is received;
  • Step S717 When receiving the uplink frame of the ONU, send the downlink optical signal to the ONU; otherwise, execute step S718;
  • Step S718 When the uplink frame of the ONU is not received, the signal detection of the uplink frame of the ONU is maintained until the uplink frame sent by the ONU is received, and the downlink optical signal is sent to the ONU.
  • the ONU determines that it has not received the downlink optical signal sent by the OLT within the second time after sending the uplink frame, that is, it determines that it has not received the SD signal generated by the OLT sending the downlink optical signal, it will continue to send the uplink optical signal to the OLT. frame, and continuously detects whether the current ONU receives the SD signal generated by the OLT sending a downlink optical signal. When the ONU receives the SD signal, the ONU stops sending uplink frames to the OLT.
  • the signal transmission method in this embodiment of the present application includes steps S811 to S818:
  • Step S811 After the ONU is powered on, it detects whether it has received the downlink optical signal sent by the OLT. If it is determined that the downlink optical signal from the OLT has not been received within the first time after the ONU is powered on, it sends the uplink optical signal to the OLT. Otherwise, perform steps S812;
  • Step S812 when it is determined that the downlink optical signal sent by the OLT is received within the first time after the ONU is powered on, cancel the sending of the uplink optical signal to the OLT, and start executing step S815;
  • Step S813 when it is determined that the downlink optical signal sent by the OLT is not received within the second time after the uplink optical signal is sent, continue to send the uplink optical signal to the OLT;
  • Step S814 When it is determined that the downlink optical signal sent by the OLT according to the uplink optical signal is received, stop sending the uplink optical signal to the OLT;
  • Step S815, enter the traditional activation process
  • Step S816 When the OLT is powered on, it first keeps the downlink optical signal off and detects whether the uplink optical signal sent by the ONU is received;
  • Step S817 When receiving the uplink optical signal of the ONU, send the downlink optical signal to the ONU; otherwise, execute step S818;
  • Step S818 When the uplink optical signal of the ONU is not received, the signal detection of the uplink optical signal of the ONU is maintained until the uplink optical signal sent by the ONU is received, and the downlink optical signal is sent to the ONU.
  • the ONU determines that it has not received the downlink optical signal sent by the OLT within the second time after sending the uplink optical signal, that is, it determines that it has not received the SD signal generated by the OLT sending the downlink optical signal, it will continue to send the signal to the OLT.
  • Uplink frames and continuously detects whether the current ONU receives the SD signal.
  • the ONU stops sending uplink frames to the OLT.
  • the signal transmission method in this embodiment of the present application includes steps S911 to S918:
  • Step S911 After the ONU is powered on, it detects whether it has received the downlink frame sent by the OLT. If it is determined that the downlink frame from the OLT has not been received within the first time after the ONU is powered on, it sends an uplink optical signal to the OLT. Otherwise, step S912 is executed;
  • Step S912 when it is determined that the downlink frame sent by the OLT is received within the first time after the ONU is powered on, cancel the sending of the uplink optical signal to the OLT, and start executing step S915;
  • Step S913 when it is determined that the downlink frame sent by the OLT is not received within the second time after the uplink optical signal is sent, continue to send the uplink optical signal to the OLT;
  • Step S914 When it is determined that the downlink frame sent by the OLT according to the uplink optical signal is received, stop sending the uplink optical signal to the OLT;
  • Step S915 enter the traditional activation process
  • Step S916 When the OLT is powered on, it first keeps the downlink frame closed and detects whether the uplink optical signal sent by the ONU is received;
  • Step S917 When receiving the uplink optical signal of the ONU, send the downlink frame to the ONU; otherwise, execute step S918;
  • Step S918 When the uplink optical signal of the ONU is not received, signal detection of the uplink optical signal of the ONU is maintained until the uplink optical signal sent by the ONU is received, and a downlink frame is sent to the ONU.
  • the ONU determines that it has not received the downlink frame sent by the OLT within the second time after sending the uplink optical signal, the ONU continues to send the uplink optical signal to the OLT and continuously detects whether the current ONU has received the downlink frame sent by the OLT. Until the ONU receives the downlink frame sent by the OLT, the ONU stops sending uplink optical signals to the OLT.
  • An embodiment of the present application also provides an optical network unit ONU, including: a first sending module, configured to send an uplink detection signal to the OLT when the downlink signal from the optical line terminal OLT is not received.
  • the first sending module is specifically configured to send an uplink detection signal to the OLT when no downlink signal from the OLT is received within the first time after the ONU is powered on.
  • the first sending module is specifically configured to: when receiving the downlink signal of the OLT within the first time after the ONU is powered on, cancel sending the uplink detection signal to the OLT.
  • the ONU provided by the embodiment of the present application also includes: a first receiving module, configured to detect the downlink signal of the OLT within the first time after the ONU is powered on; wherein the downlink signal includes at least one of the following: a downlink frame and a downlink optical signal.
  • detecting the downlink signal of the OLT within the first time after the ONU is powered on includes at least one of the following:
  • Detect the OLT downlink frame within the first time after the ONU is powered on When the OLT downlink frame is detected, it is determined that the OLT downlink signal is received within the first time after the ONU is powered on;
  • the SD signal is detected within the first time after the ONU is powered on. When the SD signal is detected, it is determined that the downlink signal from the OLT is received within the first time after the ONU is powered on. The SD signal is when the ONU receives the downlink signal from the OLT. Generated after the downlink optical signal.
  • the first receiving module is also configured to: when receiving the downlink signal of the OLT within the first time after the ONU is powered on, perform at least one of the following:
  • the uplink detection signal includes at least one of the following: uplink frame, uplink optical signal.
  • the first sending module is specifically configured to: after sending the uplink detection signal to the OLT, when it is determined that the downlink signal sent by the OLT according to the uplink detection signal is received, stop sending the uplink detection signal to the OLT.
  • the first sending module is also specifically configured to: after sending the uplink detection signal to the OLT, when it is determined that the downlink signal of the OLT is not received within the second time after sending the uplink detection signal, continue to send the uplink detection signal to the OLT. .
  • the embodiment of the present application also provides an optical line terminal OLT, including: a second sending module, configured to keep the downlink signal off after power-on until the uplink detection signal of the optical network unit ONU is received; and, when receiving the uplink detection signal of the optical network unit ONU, The uplink detection signal of the unit ONU sends a downlink signal to the ONU.
  • a second sending module configured to keep the downlink signal off after power-on until the uplink detection signal of the optical network unit ONU is received
  • the uplink detection signal of the unit ONU sends a downlink signal to the ONU.
  • the uplink detection signal includes at least one of the following: uplink frame, uplink optical signal.
  • the OLT further includes a second receiving module, and the second receiving module is configured to: detect the uplink frame of the ONU, and when the uplink frame of the ONU is detected, determine that the uplink detection signal of the ONU is received.
  • the second receiving module can also be used to: detect the SD signal, and when the SD signal is detected, determine that the uplink detection signal of the ONU is received, where the SD signal is generated by the OLT after receiving the uplink optical signal from the ONU.
  • sending downlink signals to the ONU includes at least one of the following:
  • the embodiment of the present application also provides an optical network system, including an optical line terminal OLT and an optical network unit ONU; wherein,
  • the ONU includes a first sending module, configured to send an uplink detection signal to the OLT when the downlink signal from the optical line terminal OLT is not received;
  • the OLT includes a second sending module, which is used to power on and detect the uplink detection signal of the optical network unit ONU; and when receiving the uplink detection signal of the optical network unit ONU, send a downlink signal to the ONU.
  • the embodiment of the present application also provides an optical network unit ONU, as shown in Figure 10.
  • the optical network unit ONU 1000 includes but is not limited to:
  • Processor 1010 and memory 1020 are processors 1010 and memory 1020;
  • the memory 1020 stores program instructions. When executed by the processor 1010, the program instructions cause the processor 1010 to perform the signal transmission method described in any of the above embodiments when applied to the optical network unit ONU.
  • the embodiment of the present application also provides an optical line terminal OLT, as shown in Figure 11.
  • the optical line terminal OLT 1100 includes but is not limited to:
  • Processor 1010 and memory 1020 are processors 1010 and memory 1020;
  • the memory 1020 stores program instructions. When executed by the processor 1010, the program instructions cause the processor 1010 to perform the signal transmission method described in any of the above embodiments when applied to the optical line terminal OLT.
  • processor 1010 and memory 1020 may be connected through a bus or other means.
  • the processor 1010 may adopt a central processing unit (Central Processing Unit, CPU).
  • the processor can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • FPGA field programmable gate array
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.
  • the processor 1010 uses one or more integrated circuits to execute relevant programs to implement the technical solutions provided by the embodiments of the present application.
  • the memory 1020 can be used to store non-transitory software programs and non-transitory computer executable programs, such as the signal transmission method described in any embodiment of this application.
  • the processor 1010 implements the above signal transmission method by running non-transient software programs and instructions stored in the memory 1020 .
  • the memory 1020 may include a program storage area and a data storage area, where the program storage area may store an operating system and an application program required for at least one function; the storage data area may store the execution of the above-mentioned signal transmission method.
  • the memory 1020 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid-state storage device.
  • the memory 1020 optionally includes memory located remotely relative to the processor 1010, and these remote memories may be connected to the processor 1010 through a network. Examples of the above-mentioned networks include but are not limited to the Internet, intranets, local area networks, mobile communication networks and combinations thereof.
  • the non-transitory software programs and instructions required to implement the above signal transmission method are stored in the memory 1020.
  • the signal transmission method provided by any embodiment of the present application is executed.
  • Embodiments of the present application also provide a computer-readable storage medium.
  • the computer-readable storage medium stores program instructions. When the program instructions are executed by the computer, the signal transmission method described in any of the above embodiments is implemented.
  • the computer storage medium in the embodiment of the present application may be any combination of one or more computer-readable media.
  • the computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium.
  • the computer-readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples (non-exhaustive list) of computer readable storage media include: electrical connections having one or more conductors, portable computer disks, hard drives, random access memory (RAM), read only memory (ROM), Erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the above.
  • a computer-readable storage medium may be any tangible medium that contains or stores a program for use by or in connection with an instruction execution system, apparatus, or device.
  • a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave carrying computer-readable program code therein. Such propagated data signals may take many forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above.
  • a computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device .
  • Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including, but not limited to, wireless, wire, optical cable, RF, etc., or any suitable combination of the foregoing.
  • Computer program code for performing the operations of the present application may be written in one or more programming languages, including object-oriented programming languages such as Java, Smalltalk, C++, and conventional procedural programming languages, or a combination thereof.
  • Programming language such as "C” or a similar programming language.
  • the program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server.
  • the remote computer can be connected to the user computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (such as through the Internet using an Internet service provider).
  • LAN local area network
  • WAN wide area network
  • Internet service provider such as AT&T, MCI, Sprint, EarthLink, MSN, GTE, etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Small-Scale Networks (AREA)

Abstract

本申请实施例提供了一种信号传输方法、光网络单元和光线路终端，其中信号传输方法包括：当未接收到光线路终端OLT的下行信号，光网络单元ONU向OLT发送上行探测信号，使得处于下行信号关闭状态的OLT在接收到上行探测信号后，开始向本ONU发送下行信号。

Description

信号传输方法、光网络单元和光线路终端
相关申请的交叉引用
本申请基于申请号为202210409964.6、申请日为2022年04月19日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本申请涉及通信技术领域，特别是涉及一种信号传输方法、光网络单元和光线路终端。
背景技术
随着无源光网络技术的应用和发展，逐渐从光纤到户(Fibre To The Home，FTTH)延伸进家庭，并随着国内国际标准的标准化，实现了光纤到房间(Fiber To The Room，FTTR)。目前，FTTR一般采用和FTTH同样的无源光网络技术和系统，同样的制式、上下行波长、协议封装和工作机制等。
在实际应用中，通常将光纤到户的光网络单元(Fibre To The Home Optical Network Unit，FTTH ONU)和光纤到房间的光线路终端(Fiber To The Room Optical Line Terminal，FTTR OLT)集成在一个设备中，并称之为主网关。主网关上具有上联光口和下联光口，主网关通过上联光口与FTTH OLT连接，则按照FTTH ONU进行工作；主网关通过下联光口与FTTR ONU连接，则按照FTTR OLT进行工作。然而，在实际部署中，这种设置方式会出现误操作的情况，例如，设备在进行工作时，将FTTR主网关的下联光口当作上联光口接入到FTTH，使得FTTR主网关的上行波长和FTTH的下行波长一样，从而会对FTTH的下行波长工作带来影响，使得FTTH ONU出现接收到误码的情况，甚至无法正常工作而导致下线。
发明内容
本申请实施例提供了一种信号传输方法、光网络单元和光线路终端，该信号传输方法能够避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。
第一方面，本申请实施例提供一种信号传输方法，应用于光网络单元ONU，所述方法包括：
当未接收到光线路终端OLT的下行信号，向所述OLT发送上行探测信号。
第二方面，本申请实施例提供一种信号传输方法，应用于光线路终端OLT，所述方法包括：
上电后保持下行信号关闭，直至接收到光网络单元ONU的上行探测信号；
当接收到光网络单元ONU的上行探测信号，向所述ONU发送下行信号。
第三方面，本申请实施例提供一种光网络单元ONU，包括：
第一发送模块，用于当未接收到光线路终端OLT的下行信号，向所述OLT发送上行探测信号。
第四方面，本申请实施例提供一种光线路终端OLT，包括：
第二发送模块，用于上电后保持下行信号关闭，直至接收到光网络单元ONU的上行探测信号；以及，当接收到光网络单元ONU的上行探测信号，向所述ONU发送下行信号。
第五方面，本申请实施例提供一种光网络系统，包括光线路终端OLT和光网络单元ONU，其中，
所述ONU包括第一发送模块，用于当未接收到光线路终端OLT的下行信号，向所述OLT发送上行探测信号；
所述OLT包括第二发送模块，用于上电并检测光网络单元ONU的上行探测信号；以及，当接收到光网络单元ONU的上行探测信号，向所述ONU发送下行信号。
第六方面，本申请实施例提供一种光网络单元ONU，包括：
处理器和存储器；
所述存储器上存储有程序指令，所述程序指令当被所述处理器执行时使得所述处理器执行如上第一方面任一项所述的信号传输方法。
第七方面，本申请实施例提供一种光网络系统，包括光线路终端OLT和光网络单元ONU，其中，
所述ONU包括第一发送模块，用于当未接收到光线路终端OLT的下行信号，向所述OLT发送上行探测信号；
所述OLT包括第二发送模块，用于上电并检测光网络单元ONU的上行探测信号；以及，当接收到光网络单元ONU的上行探测信号，向所述ONU发送下行信号。
第八方面，本申请实施例提供一种光线路终端OLT，包括：
处理器和存储器；
所述存储器上存储有程序指令，所述程序指令当被所述处理器执行时使得所述处理器执行如上第二方面任一项所述的信号传输方法。
第九方面，本申请实施例提供一种计算机可读存储介质，存储有程序指令，所述程序指令被计算机执行时，实现：如上第一方面任一项所述的信号传输方法，或者如上第二方面任一项所述的信号传输方法。
本申请实施例中，ONU上电后，在未接收到OLT的下行信号的情况下，向OLT发送上行探测信号，使得处于下行信号关闭状态的OLT在接收到上行探测信号后，开始向本ONU发送下行信号。本申请实施例在OLT上电后首先将下行信号处于关闭状态，当未接收到ONU发送的上行探测信号时，不向ONU发送下行信号，能够有效的节省设备在无源光网络中的能量消耗，通过给予ONU向OLT发送上行探测信号的主动地位，能够有效避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。
附图说明
附图用来提供对本申请技术方案的进一步理解，并且构成说明书的一部分，与本申请的实施例一起用于解释本申请的技术方案，并不构成对本申请技术方案的限制。
图1是实际应用中主网关与ONU和OLT的连接示意图；
图2是本申请实施例提供的一种信号传输方法的第一交互示意图；
图3是ONU与OLT间传统的激活流程的步骤流程示意图；
图4是本申请实施例提供的结合传统的激活流程的步骤流程示意图；
图5是本申请实施例提供的一种信号传输方法应用于OLT的流程示意图；
图6是本申请实施例提供的一种信号传输方法的第二交互示意图；
图7是本申请实施例提供的一种信号传输方法的第三交互示意图；
图8是本申请实施例提供的一种信号传输方法的第四交互示意图；
图9是本申请实施例提供的一种信号传输方法的第五交互示意图；
图10是本申请实施例提供的光网络单元ONU的设备结构示意图；
图11是本申请实施例提供的光线路终端OLT的设备结构示意图。
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。
应了解，在本申请实施例的描述中，如果有描述到“第一”、“第二”等只是用于区分技术特征为目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量或者隐含指明所指示的技术特征的先后关系。“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示单独存在A、同时存在A和B、单独存在B的情况。其中A，B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项”及其类似表达，是指的这些项中的任意组，包括单项或复数项的任意组。例如，a、b和c中的至少一项可以表示：a，b，c，a和b，a和c，b和c，或者，a和b和c，其中a，b，c可以是单个，也可以是多个。
此外，下面所描述的本申请各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以相互组合。
随着无源光网络技术的应用和发展，逐渐从光纤到户(Fibre To The Home，FTTH)延伸进家庭，并随着国内国际标准的标准化，实现了光纤到房间(Fiber To The Room，FTTR)。目前，FTTR一般采用和FTTH同样的无源光网络技术和系统，同样的制式、上下行波长、协议封装和工作机制等。
在实际应用中，通常将光纤到户的光网络单元(Fibre To The Home Optical Network Unit，FTTH ONU)和光纤到房间的光线路终端(Fiber To The Room Optical Line Terminal，FTTR OLT)集成在一个设备中，并称之为主网关。如图1所示，主网关上具有上联光口和下联光口，主网关通过上联光口与接入网光线路终端(Optical Line Terminal，OLT)连接，则按照接入网光网络单元(Optical Network Unit，ONU)进行工作；主网关通过下联光口与家庭网络ONU连接，则按照家庭网络OLT进行工作。然而，在实际部署中，这种设置方式会出现误操作的情况，例如，设备在进行工作时，将FTTR主网关的下联光口当作上联光口接入到FTTH，使得FTTR主网关的上行波长和FTTH的下行波长一样，从而会对FTTH的下行波长工作带来影响，使得FTTH ONU出现接收到误码的情况，甚至无法正常工作而导致下线。
下面对本申请中涉及的若干术语进行解析：
FTTR：是指光纤敷设到房间，为光纤接入的一种基本技术方式，与之对应的还有光纤到楼宇(Fibre To The Build，FTTB)，光纤到路边(Fibre To The Curb，FTTC)，光纤到小 区(Fibre To The Zone，FTTZ)，FTTH，敷设时可采用总线型，环形，星型或树形拓扑结构。
无源光网络(Passive Optical Network，PON)：是一种点对多点的光纤传输和接入技术，下行采用广播方式、上行采用时分多址方式，可以灵活地组成树形、星型、总线型等拓扑结构，具有节省光缆资源、带宽资源共享、节省机房投资、建网速度快、综合建网成本低等优点。
OLT：是光接入网的核心部件，相当于传统通信网中的交换机或路由器，同时也是一个多业务提供平台。一般用于提供面向用户的无源光纤网络的光纤接口。功能有：上联上层网络，完成PON网络的上行接入，通过光分配网络(Optical Distribution Network，ODN)下连用户端设备ONU，实现对用户端设备ONU的控制、管理和测距等功能。
ONU：分为有源光网络单元和无源光网络单元。一般把装有包括光接收机、上行光发射机、多个桥接放大器网络监控的设备叫做光节点。PON使用单光纤连接到OLT，然后OLT连接到ONU。ONU提供数据、交互式网络电视、语音等业务。
物理层操作管理和维护PLOAM消息(Physical Layer Operation Administration and Maintenance，PLOAM消息)：PLOAM消息可以是广播的，也可以是单播的，该消息提供的主要功能为：进行上行Burst的配置、ONU激活、ONU注册、加密密钥的更新，交换保护开关信号、功率管理等。
为了解决上述问题，本申请实施例提供了一种信号传输方法、光网络单元和光线路终端，该信号传输方法能够避免FTTR主网关下联光口接错时对FTTH下行波长产生的影响。
本申请描述的实施例可以被实现在通信系统中，诸如在以下系统的至少一个中：全球移动通信系统(GSM)或任何其他第二代蜂窝通信系统、基于基本的宽带码分多址(W-CDMA)的通用移动电信系统(UMTS，3G)、高速分组接入(HSPA)、长期演进(LTE)、高级LTE、基于IEEE 802.11规范的系统、基于IEEE 802.15规范的系统和/或第五代(5G)移动或蜂窝通信系统；以及未来的移动通信系统。然而，实施例不限于上述示例给出的系统，而是本领域技术人员可以将解决方案应用于具有必要属性的其他通信系统。
如图2所示，为本申请实施例提供的一种信号传输方法应用于光网络单元ONU的流程示意图。该方法在应用于光网络单元ONU的实现过程包括但不限于步骤S110。
步骤S110，当未接收到光线路终端OLT的下行信号，向OLT发送上行探测信号。
可以理解的是，不同于传统的PON中OLT一上电就可以发光并发送下行帧，ONU在OLT的指示下才能发光并发送上行帧的方式，本申请实施例描述的信号传输方法，在初始阶段，给予ONU在PON中的主动地位。首先判断ONU中是否接收到的OLT所发送的下行信号，如果ONU未接收到OLT发送的下行信号，尝试短暂的信号发送，具体表示为ONU先向OLT发送上行探测信号。
需要说明的是，本申请实施例中应用于ONU的信号传输方法，可以应用在ONU与OLT执行网络激活过程，即ONU上电时，当ONU未接收到OLT的下行信号，则向OLT发送上行探测信号，使得处于下行信号关闭状态的OLT在接收到上行探测信号后，开始向本ONU发送下行信号，从而避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。在激活过程之后，OLT和ONU按照传统的通信过程，即通过OLT向ONU发送下行信号，ONU在OLT的控制下发送上行信号。
需要说明的是，本申请实施例在ONU与OLT执行激活过程的初始阶段，OLT和ONU没有 相互交互，ONU没有从OLT获取到下行时钟，当未接收到OLT的下行信号，ONU采用本地时钟向OLT发送上行探测信号。
需要说明的是，ONU发送的上行探测信号可以采用默认的guard time，preamble，delimiter等上行探测信号参数，OLT也采用默认的guard time，preamble，delimiter等上行探测信号参数对上行探测信号进行恢复和读取。但本申请并不限定于仅采用默认的上行探测信号参数。
在一些实施例中，ONU向OLT发送上行探测信号的过程具体包括：当在ONU上电后的第一时间内未接收到OLT的下行信号，向OLT发送上行探测信号。
需要说明的是，上述的第一时间的时间长度并不作具体限定，可以根据实际需求进行设定。
可以理解的是，本申请实施例的信号传输方法也可以同时应用于在ONU与OLT执行网络激活过程和后续的通信过程中，具体为，ONU上电时，当ONU未接收到OLT的下行信号，则向OLT发送上行探测信号，当在ONU上电后的第一时间内未接收到OLT的下行信号，ONU向OLT发送上行探测信号，使得处于下行信号关闭状态的OLT在接收到上行探测信号后，开始向本ONU发送下行信号。本申请实施例通过给予ONU向OLT发送上行探测信号的主动地位，能够有效避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。
可以理解的是，在实际应用中，当OLT连接多个ONU，当一个ONU上电后的第一时间内未接收到OLT的下行信号，其他的ONU也是无法接收到OLT发送的下行信号，即OLT连接的多个ONU之间相互独立，互不影响。
在一些实施例中，本申请实施例提供的一种信号传输方法在应用于光网络单元ONU的实现过程还包括但不限于步骤S120和步骤S130中的至少一种。
步骤S120，当在ONU上电后的第一时间内接收到OLT的下行信号，取消向OLT发送上行探测信号。
可以理解的是，本申请实施例中应用于ONU的信号传输方法，可以在ONU与OLT执行网络激活过程时进行应用，即ONU上电时，当未接收到OLT的下行信号，则向OLT发送上行探测信号，使得处于下行信号关闭状态的OLT在接收到上行探测信号后，开始向本ONU发送下行信号，且当在ONU上电后的第一时间内接收到OLT的下行信号，取消向OLT发送上行探测信号，激活完成之后，OLT和ONU按照传统的通信过程，即通过OLT向ONU发送下行信号，ONU在OLT的控制下发送上行探测信号，从而避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。
步骤S130，在ONU上电后的第一时间内检测OLT的下行信号；其中，下行信号包括以下至少之一：下行帧，下行光信号。
可以理解的是，ONU上电时，当未接收到OLT的下行信号，则向OLT发送上行探测信号，使得处于下行信号关闭状态的OLT在接收到上行探测信号后，开始向本ONU发送下行信号。在ONU上电后的第一时间内检测OLT的下行信号，当接收到OLT的下行帧和/或下行光信号，则ONU取消向OLT发送上行探测信号。之后，OLT和ONU按照传统的通信过程，即通过OLT向ONU发送下行信号，ONU在OLT的控制下发送上行探测信号，从而避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。
需要说明的是，OLT向ONU发送的下行帧包括：发送下行超帧、开放安静窗口等，OLT向 ONU发送的下行光信号包括发送序列号请求消息(Serial Number，SN请求消息)等，在OLT发送下行帧和/或下行光信号后，或者，在ONU接收到OLT的下行帧和/或下行光信号后，OLT和ONU之间再采用传统的激活流程对ONU进行激活，ONU激活成功后，通过OLT向ONU发送下行信号，ONU在OLT的控制下发送上行探测信号。
需要说明的是，传统的PON中，ONU处于被动地位，即OLT一上电就先向ONU发送下行光信号和/或下行帧，而ONU必须在OLT的指示控制下才能发送对应的上行光信号和/或上行帧。如图3所示，ONU与OLT间传统的激活流程包括但不限于步骤S311至步骤S317。
步骤S311，OLT向ONU发送下行帧；
步骤S312，OLT向ONU发送SN请求消息；
步骤S313，ONU根据接收到的SN请求消息向OLT发送对应的SN响应；
步骤S314，OLT根据接收到的SN响应为ONU分配对应的ONU-ID；
步骤S315，OLT向ONU发送测距请求；
步骤S316，ONU根据接收到的测距请求向OLT发送对应的测距响应；
步骤S317，OLT向ONU返回测距结果。
需要说明的是，如图4所示，为了避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响，本申请实施例在传统的激活流程之前，OLT上电后，首先检测是否接收到ONU发送的上行探测信号，具体采用的激活流程包括但不限于步骤S411至步骤S418。
步骤S411，OLT检测是否接收到ONU发送的上行探测信号；
步骤S412，OLT接收到ONU发送的上行探测信号后，向ONU发送下行帧；
步骤S413，OLT向ONU发送SN请求消息；
步骤S414，ONU根据接收到的SN请求消息向OLT发送对应的SN响应；
步骤S415，OLT根据接收到的SN响应为ONU分配对应的ONU-ID；
步骤S416，OLT向ONU发送测距请求；
步骤S417，ONU根据接收到的测距请求向OLT发送对应的测距响应；
步骤S418，OLT向ONU返回测距结果。
需要说明的是，OLT下联的ONU都不工作或者都进入节能状态时，OLT也停止工作或者进入节能状态，停止发送下行信号，此时，OLT和ONU都进入初始状态。当ONU恢复工作时，OLT和ONU，OLT上电后，首先检测是否接收到ONU发送的上行探测信号，ONU上电后，当未接收到光线路终端OLT的下行信号，向OLT发送上行探测信号。在ONU接收到OLT的下行帧和/或下行光信号后，OLT和ONU之间再采用传统的激活流程对ONU进行激活，ONU激活成功后，通过OLT向ONU发送下行信号，ONU在OLT的控制下发送上行探测信号。
在一些实施例中，在ONU上电后的第一时间内检测OLT的下行信号的过程具体可以包括：在ONU上电后的第一时间内检测OLT的下行帧，当检测到OLT下行帧，确定在ONU上电后的第一时间内接收到OLT的下行信号。
可以理解的是，ONU上电时，当未接收到OLT的下行信号，在ONU上电后的第一时间内检测OLT的下行帧，当检测到OLT下行帧，确定在ONU上电后的第一时间内接收到OLT的下行信号，则ONU取消向OLT发送上行探测信号。
在一些实施例中，在ONU上电后的第一时间内检测OLT的下行信号的过程具体还可以包括：在ONU上电后的第一时间内检测SD(Signal Detect，信号检测)信号，当检测到SD信 号，确定在ONU上电后的第一时间内接收到OLT的下行信号，其中，SD信号为ONU在接收到来自OLT的下行光信号后产生。
可以理解的是，ONU上电时，当未接收到OLT的下行信号，在ONU上电后的第一时间内检测OLT的下行光信号是否产生SD信号，当检测到SD信号，确定在ONU上电后的第一时间内接收到OLT的下行信号，则取消向OLT发送上行探测信号。
在一些实施例中，当在ONU上电后的第一时间内接收到OLT的下行信号，本申请实施例提供的一种信号传输方法还包括但不限于以下至少之一：
接收OLT发送的带宽分配消息；
接收OLT发送的物理层操作管理和维护PLOAM消息；
接收OLT发送的SN请求消息。
可以理解的是，当在ONU上电后的第一时间内未接收到OLT的下行信号，则向OLT发送上行探测信号，其中，所接收到的OLT的下行信号可以为OLT发送的带宽分配消息，和/或OLT发送的PLOAM消息，和/或OLT发送的SN请求消息。当确定在ONU上电后的第一时间内接收到OLT的下行信号后，OLT和ONU按照传统的通信过程，即通过OLT向ONU发送下行信号，ONU在OLT的控制下发送上行信号。
需要说明的是，ONU发送的上行探测信号可以是已知的PLOAM消息，也可以是新定义的PLOAM消息。
在一些实施例中，本申请实施例提供的一种信号传输方法在应用于ONU中，上行探测信号包括以下至少之一：上行帧，上行光信号。
可以理解的是，ONU上电时，当未接收到OLT的下行信号，则向OLT发送上行帧和/或上行光信号，当在ONU上电后的第一时间内接收到OLT的下行信号，取消向OLT发送上行帧和/或上行光信号。之后，OLT和ONU按照传统的通信过程，即通过OLT向ONU发送下行信号，ONU在OLT的控制下发送上行帧和/或上行光信号，从而避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。
在一些实施例中，在向OLT发送上行探测信号之后，本申请实施例提供的一种信号传输方法在应用于ONU的实现过程还包括步骤S140。
步骤S140，当接收到OLT根据上行探测信号发送的下行信号，停止向OLT发送上行探测信号。
可以理解的是，当在ONU上电后的第一时间内未接收到OLT的下行信号，则向OLT发送上行探测信号，当接收到OLT根据上行探测信号发送的下行信号，停止向OLT发送上行探测信号，并进入传统的激活流程。激活完成之后，OLT和ONU按照传统的通信过程，即通过OLT向ONU发送下行信号，ONU在OLT的控制下发送上行帧和/或上行光信号，从而避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。
在一些实施例中，在向OLT发送上行探测信号之后，本申请实施例提供的一种信号传输方法在应用于ONU的实现过程还包括步骤S150。
步骤S150，当在发送上行探测信号后的第二时间内未接收到OLT的下行信号，继续向OLT发送上行探测信号。
可以理解的是，本申请实施例中应用于ONU的信号传输方法，可以应用在ONU与OLT执行网络激活过程，也可以应用在现有的激活机制的基础上。在ONU上电时，当在ONU上电后 的第一时间内未接收到OLT的下行信号，向OLT发送上行探测信号，之后，当在发送上行探测信号后的第二时间内仍未接收到OLT的下行信号，则继续向OLT发送上行探测信号，并持续的检测当前的ONU是否接收到OLT发送的下行信号，直到ONU接收到OLT发送的下行信号时停止发送。此时，通过OLT向ONU发送下行信号，ONU在OLT的控制下发送上行帧和/或上行光信号，从而避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。
需要说明的是，上述的第二时间的时间长度并不作具体限定，可以根据实际需求进行设定。
如图5所示，为本申请实施例提供的一种信号传输方法应用于OLT的流程示意图。该方法在应用于光线路终端OLT的实现过程包括但不限于步骤S510和步骤S520。
步骤S510，上电后保持下行信号关闭，直至接收到光网络单元ONU的上行探测信号。
可以理解的是，OLT上电后，首先保持下行信号关闭，即检测当前的OLT是否接收到ONU的上行探测信号，当未检测到ONU的上行探测信号，OLT的下行信号一直保持关闭，直至接收到ONU的上行探测信号。
步骤S520，当接收到光网络单元ONU的上行探测信号，向ONU发送下行信号。
可以理解的是，当OLT检测到接收到ONU的上行探测信号，则开启发送下行信号的功能，向ONU发送下行信号，ONU在OLT的控制下发送上行光信号，从而避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。
需要说明的是，OLT向ONU发送的下行信号包括下行帧和/或下行光信号，下行帧包括：发送下行超帧、SN请求消息等，下行光信号可以是没有特殊含义的光信号，在ONU接收到OLT的下行帧和/或下行光信号后，再采用传统的激活流程对ONU进行激活，激活成功后，通过OLT向ONU发送下行信号，ONU在OLT的控制下发送上行信号。
在一些实施例中，本申请实施例提供的一种信号传输方法在应用于OLT中，上行探测信号包括以下至少之一：上行帧，上行光信号。
可以理解的是，OLT上电后，首先保持下行信号关闭，即检测当前的OLT是否接收到ONU的上行帧和/或上行光信号，当未检测到ONU的上行帧和/或上行光信号，OLT的下行信号一直保持关闭，直至接收到ONU的上行帧和/或上行光信号。之后，OLT和ONU按照传统的通信过程，即通过OLT向ONU发送下行信号，ONU在OLT的控制下发送上行帧和/或上行光信号，从而避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。
在一些实施例中，本申请实施例提供的一种信号传输方法在应用于OLT中，该方法还包括但不限于步骤S530和步骤S540中的至少一种。
步骤S530，检测ONU的上行帧，当检测到ONU的上行帧，确定接收到ONU的上行探测信号。
可以理解的是，OLT上电时后保持下行信号关闭，并检测当前的OLT是否接收到ONU的上行帧，当检测到ONU的上行帧，确定接收到ONU的上行探测信号，则开始向ONU发送下行信号，在采用传统的激活流程对OLT和ONU激活完成之后，OLT和ONU按照传统的通信过程，通过OLT向ONU发送下行信号，ONU在OLT的控制下发送上行探测信号，从而避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。
步骤S540，检测SD信号，当检测到SD信号，确定接收到ONU的上行探测信号，其中，SD信号为OLT在接收到来自ONU的上行光信号后产生。
可以理解的是，OLT上电时后保持下行信号关闭，并检测当前的OLT是否接收到ONU的上行光信号时产生的SD信号，当检测到SD信号，确定接收到ONU的上行探测信号，则开始向ONU发送下行信号，在采用传统的激活流程对OLT和ONU激活完成之后，OLT和ONU按照传统的通信过程，通过OLT向ONU发送下行信号，ONU在OLT的控制下发送上行信号，从而避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。
在一些实施例中，当在ONU上电后的第一时间内接收到OLT的下行信号，本申请实施例提供的一种信号传输方法还包括但不限于以下至少之一：
在一些实施例中，当接收到ONU的上行探测信号，OLT向ONU发送下行信号，本申请实施例提供的一种信号传输方法包括但不限于以下至少之一：
向ONU发送下行帧；
向ONU发送下行光信号；
向ONU发送带宽分配消息；
向ONU发送物理层操作管理和维护PLOAM消息；
向ONU发送SN请求消息。
可以理解的是，OLT上电后，首先保持下行信号关闭，即检测当前的OLT是否接收到ONU的上行探测信号，当未检测到ONU的上行探测信号，则OLT的下行信号一直保持关闭，直至接收到ONU的上行探测信号。当OLT检测到接收到ONU的上行探测信号，则开启发送下行信号的功能，其中，OLT发送的下行信号包括至少其中一种：下行帧，下行光信号，带宽分配消息，PLOAM消息，SN请求消息。通过向ONU发送下行信号，ONU在OLT的控制下发送上行探测光信号进行网络通信，从而避免主网关下联光口接错时对主网关上联无源光网络的下行波长产生的影响。
需要说明的是，OLT发送的PLOAM消息可以是已知的PLOAM消息，也可以是新定义的PLOAM消息。
示例性的，如实施例一，请参照图6，本申请实施例的信号传输方法包括步骤S611至步骤S618：
步骤S611，ONU上电后，检测是否接收到OLT发送的下行帧，当在ONU上电后的第一时间内确定未接收到OLT的下行帧，向OLT发送上行帧，否则执行步骤S612；
步骤S612，当在ONU上电后的第一时间内确定接收到OLT的下行帧，取消向OLT发送上行帧，并开始执行步骤S615；
步骤S613，当确定在发送上行帧后的第二时间内未接收到OLT发送的下行帧，则继续向OLT发送上行帧；
步骤S614，当确定接收到OLT根据上行帧发送的下行帧，停止向OLT发送上行帧；
步骤S615，进入传统的激活流程；
步骤S616，OLT上电时，首先保持下行帧关闭，检测是否接收到ONU发送的上行帧；
步骤S617，当接收到ONU的上行帧，向ONU发送下行帧；否则，执行步骤S618；
步骤S618，当未接收到ONU的上行帧，则保持对ONU的上行帧的信号检测，直到接收到ONU发送的上行帧，向ONU发送下行帧。
需要说明的是，当ONU确定在发送上行帧后的第二时间内未接收到OLT发送的下行帧，则ONU继续向OLT发送上行帧，并持续的检测当前的ONU是否接收到OLT发送的下行帧，直 到ONU接收到OLT发送的下行帧时，ONU停止向OLT发送上行帧。
示例性的，如实施例二，请参照图7，本申请实施例的信号传输方法包括步骤S711至步骤S718：
步骤S711，ONU上电后，检测是否接收到OLT发送的下行光信号，当在ONU上电后的第一时间内确定未接收到OLT的下行光信号，向OLT发送上行帧，否则执行步骤S712；
步骤S712，当在ONU上电后的第一时间内确定接收到OLT发送的下行光信号，取消向OLT发送上行帧，并开始执行步骤S715；
步骤S713，当确定在发送上行帧后的第二时间内未接收到OLT发送的下行光信号，则继续向OLT发送上行帧；
步骤S714，当确定接收到OLT根据上行帧发送的下行光信号，停止向OLT发送上行帧；
步骤S715，进入传统的激活流程；
步骤S716，OLT上电时，首先保持下行光信号关闭，检测是否接收到ONU发送的上行帧；
步骤S717，当接收到ONU的上行帧，向ONU发送下行光信号；否则，执行步骤S718；
步骤S718，当未接收到ONU的上行帧，保持对ONU的上行帧的信号检测，直到接收到ONU发送的上行帧，向ONU发送下行光信号。
需要说明的是，当ONU确定在发送上行帧后的第二时间内未接收到OLT发送的下行光信号，即确定未接收到OLT发送下行光信号而产生的SD信号，则继续向OLT发送上行帧，并持续的检测当前的ONU是否接收到OLT发送下行光信号而产生的SD信号，直到ONU接收到SD信号时，ONU停止向OLT发送上行帧。
示例性的，如实施例三，请参照图8，本申请实施例的信号传输方法包括步骤S811至步骤S818：
步骤S811，ONU上电后，检测是否接收到OLT发送的下行光信号，当在ONU上电后的第一时间内确定未接收到OLT的下行光信号，向OLT发送上行光信号，否则执行步骤S812；
步骤S812，当在ONU上电后的第一时间内确定接收到OLT发送的下行光信号，取消向OLT发送上行光信号，并开始执行步骤S815；
步骤S813，当确定在发送上行光信号后的第二时间内未接收到OLT发送的下行光信号，则继续向OLT发送上行光信号；
步骤S814，当确定接收到OLT根据上行光信号发送的下行光信号，停止向OLT发送上行光信号；
步骤S815，进入传统的激活流程；
步骤S816，OLT上电时，首先保持下行光信号关闭，检测是否接收到ONU发送的上行光信号；
步骤S817，当接收到ONU的上行光信号，向ONU发送下行光信号；否则，执行步骤S818；
步骤S818，当未接收到ONU的上行光信号，保持对ONU的上行光信号的信号检测，直到接收到ONU发送的上行光信号，向ONU发送下行光信号。
需要说明的是，当ONU确定在发送上行光信号后的第二时间内未接收到OLT发送的下行光信号，即确定未接收到OLT发送下行光信号而产生的SD信号，则继续向OLT发送上行帧，并持续的检测当前的ONU是否接收到SD信号，直到ONU接收到SD信号时，ONU停止向OLT发送上行帧。
示例性的，如实施例四，请参照图9，本申请实施例的信号传输方法包括步骤S911至步骤S918：
步骤S911，ONU上电后，检测是否接收到OLT发送的下行帧，当在ONU上电后的第一时间内确定未接收到OLT的下行帧，向OLT发送上行光信号，否则执行步骤S912；
步骤S912，当在ONU上电后的第一时间内确定接收到OLT发送的下行帧，取消向OLT发送上行光信号，并开始执行步骤S915；
步骤S913，当确定在发送上行光信号后的第二时间内未接收到OLT发送的下行帧，则继续向OLT发送上行光信号；
步骤S914，当确定接收到OLT根据上行光信号发送的下行帧，停止向OLT发送上行光信号；
步骤S915，进入传统的激活流程；
步骤S916，OLT上电时，首先保持下行帧关闭，检测是否接收到ONU发送的上行光信号；
步骤S917，当接收到ONU的上行光信号，向ONU发送下行帧；否则，执行步骤S918；
步骤S918，当未接收到ONU的上行光信号，保持对ONU的上行光信号的信号检测，直到接收到ONU发送的上行光信号，向ONU发送下行帧。
需要说明的是，当ONU确定在发送上行光信号后的第二时间内未接收到OLT发送的下行帧，则ONU继续向OLT发送上行光信号，并持续的检测当前的ONU是否接收到OLT发送的下行帧，直到ONU接收到OLT发送的下行帧时，ONU停止向OLT发送上行光信号。
需说明的是，本申请实施例中尽管在附图中以特定的顺序描述操作，但是不应将其理解为要求按照所示的特定顺序或是串行顺序来执行这些操作，或是要求执行全部所示的操作以得到期望的结果。在特定环境中，多任务和并行处理可能是有利的。
本申请实施例还提供了一种光网络单元ONU，包括：第一发送模块，用于当未接收到光线路终端OLT的下行信号，向OLT发送上行探测信号。
示例性的，第一发送模块具体用于：当在ONU上电后的第一时间内未接收到OLT的下行信号，向OLT发送上行探测信号。
示例性的，第一发送模块还具体用于：当在ONU上电后的第一时间内接收到OLT的下行信号，取消向OLT发送上行探测信号。
本申请实施例提供的ONU还包括：第一接收模块，用于在ONU上电后的第一时间内检测OLT的下行信号；其中，下行信号包括以下至少之一：下行帧，下行光信号。
示例性的，在ONU上电后的第一时间内检测OLT的下行信号，至少包括以下之一：
在ONU上电后的第一时间内检测OLT的下行帧，当检测到OLT下行帧，确定在ONU上电后的第一时间内接收到OLT的下行信号；
在ONU上电后的第一时间内检测SD信号，当检测到SD信号，确定在ONU上电后的第一时间内接收到OLT的下行信号，其中，SD信号为ONU在接收到来自OLT的下行光信号后产生。
示例性的，第一接收模块还用于：当在ONU上电后的第一时间内接收到OLT的下行信号，执行以下至少之一：
接收OLT发送的带宽分配消息；
接收OLT发送的物理层操作管理和维护PLOAM消息；
接收OLT发送的SN请求消息。
示例性的，上行探测信号包括以下至少之一：上行帧，上行光信号。
示例性的，第一发送模块还具体用于：在向OLT发送上行探测信号之后，当确定接收到OLT根据上行探测信号发送的下行信号，停止向OLT发送上行探测信号。
示例性的，第一发送模块还具体用于：在向OLT发送上行探测信号之后，当确定在发送上行探测信号后的第二时间内未接收到OLT的下行信号，继续向OLT发送上行探测信号。
本申请实施例还提供了一种光线路终端OLT，包括：第二发送模块，用于上电后保持下行信号关闭，直至接收到光网络单元ONU的上行探测信号；以及，当接收到光网络单元ONU的上行探测信号，向ONU发送下行信号。
示例性的，上行探测信号包括以下至少之一：上行帧，上行光信号。
示例性的，OLT还包括第二接收模块，第二接收模块用于：检测ONU的上行帧，当检测到ONU的上行帧，确定接收到ONU的上行探测信号。
示例性的，第二接收模块还可用于：检测SD信号，当检测到SD信号，确定接收到ONU的上行探测信号，其中，SD信号为OLT在接收到来自ONU的上行光信号后产生。
示例性的，向ONU发送下行信号，包括以下至少之一：
向ONU发送下行帧；
向ONU发送下行光信号；
向ONU发送带宽分配消息；
向ONU发送物理层操作管理和维护PLOAM消息；
向ONU发送SN请求消息。
本申请实施例还提供了一种光网络系统，包括光线路终端OLT和光网络单元ONU；其中，
ONU包括第一发送模块，用于当未接收到光线路终端OLT的下行信号，向OLT发送上行探测信号；
OLT包括第二发送模块，用于上电并检测光网络单元ONU的上行探测信号；以及，当接收到光网络单元ONU的上行探测信号，向ONU发送下行信号。
需说明的是，在本申请实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述或记载的部分，可以参见其它实施例的相关描述。
本申请实施例还提供了一种光网络单元ONU，如图10所示，该光网络单元ONU 1000包括但不限于：
处理器1010和存储器1020；
存储器1020上存储有程序指令，程序指令当被处理器1010执行时使得处理器1010执行如上任意实施例描述的信号传输方法在应用于光网络单元ONU。
本申请实施例还提供了一种光线路终端OLT，如图11所示，该光线路终端OLT 1100包括但不限于：
处理器1010和存储器1020；
存储器1020上存储有程序指令，程序指令当被处理器1010执行时使得处理器1010执行如上任意实施例描述的信号传输方法在应用于光线路终端OLT。
上述处理器1010和存储器1020可以通过总线或者其他方式连接。
应能理解的是，该处理器1010可以采用中央处理单元(Central Processing Unit，CPU)。该处理器还可以是其它通用处理器、数字信号处理器(Digital Signal Processor， DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门矩阵(Field Programmable Gate Array，FPGA)或者其它可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。或者该处理器1010采用一个或多个集成电路，用于执行相关程序，以实现本申请实施例所提供的技术方案。
存储器1020作为一种非暂态计算机可读存储介质，可用于存储非暂态软件程序以及非暂态性计算机可执行程序，如本申请任意实施例描述的信号传输方法。处理器1010通过运行存储在存储器1020中的非暂态软件程序以及指令，从而实现上述的信号传输方法。
存储器1020可以包括存储程序区和存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需要的应用程序；存储数据区可存储执行上述的信号传输方法。此外，存储器1020可以包括高速随机存取存储器，还可以包括非暂态存储器，比如至少一个磁盘存储器件、闪存器件、或其他非暂态固态存储器件。在一些实施方式中，存储器1020可选包括相对于处理器1010远程设置的存储器，这些远程存储器可以通过网络连接至该处理器1010。上述网络的实例包括但不限于互联网、企业内部网、局域网、移动通信网及其组合。
实现上述的信号传输方法所需的非暂态软件程序以及指令存储在存储器1020中，当被一个或者多个处理器1010执行时，执行本申请任意实施例提供的信号传输方法。
本申请实施例还提供了一种计算机可读存储介质，计算机可读存储介质存储有程序指令，程序指令被计算机执行时，实现如上任意实施例描述的信号传输方法。
本申请实施例的计算机存储介质，可以采用一个或多个计算机可读的介质的任意组合。计算机可读介质可以是计算机可读信号介质或者计算机可读存储介质。计算机可读存储介质例如可以是，但不限于，电、磁、光、电磁、红外线、或半导体的系统、装置或器件，或者任意以上的组合。计算机可读存储介质的更具体的例子(非穷举的列表)包括：具有一个或多个导线的电连接、便携式计算机磁盘、硬盘、随机存取存储器(RAM)、只读存储器(ROM)、可擦式可编程只读存储器(EPROM或闪存)、光纤、便携式紧凑磁盘只读存储器(CD-ROM)、光存储器件、磁存储器件、或者上述的任意合适的组合。在本文件中，计算机可读存储介质可以是任何包含或存储程序的有形介质，该程序可以被指令执行系统、装置或者器件使用或者与其结合使用。
计算机可读的信号介质可以包括在基带中或者作为载波一部分传播的数据信号，其中承载了计算机可读的程序代码。这种传播的数据信号可以采用多种形式，包括但不限于电磁信号、光信号或上述的任意合适的组合。计算机可读的信号介质还可以是计算机可读存储介质以外的任何计算机可读介质，该计算机可读介质可以发送、传播或者传输用于由指令执行系统、装置或者器件使用或者与其结合使用的程序。
计算机可读介质上包含的程序代码可以用任何适当的介质传输，包括、但不限于无线、电线、光缆、RF等等，或者上述的任意合适的组合。
可以以一种或多种程序设计语言或其组合来编写用于执行本申请操作的计算机程序代码，程序设计语言包括面向对象的程序设计语言—诸如Java、Smalltalk、C++，还包括常规的过程式程序设计语言—诸如“C”语言或类似的程序设计语言。程序代码可以完全地在用户计算机上执行、部分地在用户计算机上执行、作为一个独立的软件包执行、部分在用户计算机上部分在远程计算机上执行、或者完全在远程计算机或服务器上执行。在涉及远程计算机的情 形中，远程计算机可以通过任意种类的网络，包括局域网(LAN)或广域网(WAN)，连接到用户计算机，或者，可以连接到外部计算机(例如利用因特网服务提供商来通过因特网连接)。
以上是对本申请的若干实施进行了具体说明，但本申请并不局限于上述实施方式，熟悉本领域的技术人员在不违背本申请本质的共享条件下还可作出种种等同的变形或替换，这些等同的变形或替换均包括在本申请权利要求所限定的范围内。

Claims (19)

  1. 一种信号传输方法，应用于光网络单元ONU，所述方法包括：
    当未接收到光线路终端OLT的下行信号，向所述OLT发送上行探测信号。
  2. 根据权利要求1所述的方法，其中，所述向所述OLT发送上行探测信号，包括：
    当在所述ONU上电后的第一时间内未接收到所述OLT的下行信号，向所述OLT发送上行探测信号。
  3. 根据权利要求2所述的方法，还包括：
    当在所述ONU上电后的第一时间内接收到所述OLT的下行信号，取消向所述OLT发送上行探测信号。
  4. 根据权利要求2或3所述的方法，其中，在所述向所述OLT发送上行探测信号之前，所述方法还包括：
    在所述ONU上电后的第一时间内检测所述OLT的下行信号；
    其中，所述下行信号包括以下至少之一：下行帧，下行光信号。
  5. 根据权利要求4所述的方法，其中，所述在所述ONU上电后的第一时间内检测所述OLT的下行信号，至少包括以下之一：
    在所述ONU上电后的第一时间内检测所述OLT的下行帧，当检测到所述OLT下行帧，确定在所述ONU上电后的第一时间内接收到所述OLT的下行信号；
    在所述ONU上电后的第一时间内检测SD信号，当检测到所述SD信号，确定在所述ONU上电后的第一时间内接收到所述OLT的下行信号，其中，所述SD信号为所述ONU在接收到来自所述OLT的下行光信号后产生。
  6. 根据权利要求3所述的方法，其中，当在所述ONU上电后的第一时间内接收到所述OLT的下行信号，所述方法还包括以下至少之一：
    接收所述OLT发送的带宽分配消息；
    接收所述OLT发送的物理层操作管理和维护PLOAM消息；
    接收所述OLT发送的SN请求消息。
  7. 根据权利要求1所述的方法，其中，所述上行探测信号包括以下至少之一：上行帧，上行光信号。
  8. 根据权利要求1所述的方法，其中，在向所述OLT发送上行探测信号之后，所述方法还包括：
    当接收到所述OLT根据所述上行探测信号发送的下行信号，停止向所述OLT发送上行探测信号。
  9. 根据权利要求1所述的方法，其中，在向所述OLT发送上行探测信号之后，所述方法还包括：
    当在发送上行探测信号后的第二时间内未接收到所述OLT的下行信号，继续向所述OLT发送上行探测信号。
  10. 一种信号传输方法，应用于光线路终端OLT，所述方法包括：
    上电后保持下行信号关闭，直至接收到光网络单元ONU的上行探测信号；
    当接收到光网络单元ONU的上行探测信号，向所述ONU发送下行信号。
  11. 根据权利要求10所述的方法，其中，所述上行探测信号包括以下至少之一：上行帧，上行光信号。
  12. 根据权利要求10或11所述的方法，其中，所述方法还包括以下至少之一：
    检测所述ONU的上行帧，当检测到所述ONU的上行帧，确定接收到所述ONU的上行探测信号；
    检测SD信号，当检测到所述SD信号，确定接收到所述ONU的上行探测信号，其中，所述SD信号为所述OLT在接收到来自所述ONU的上行光信号后产生。
  13. 根据权利要求10所述的方法，其中，所述向所述ONU发送下行信号，包括以下至少之一：
    向所述ONU发送下行帧；
    向所述ONU发送下行光信号；
    向所述ONU发送带宽分配消息；
    向所述ONU发送物理层操作管理和维护PLOAM消息；
    向所述ONU发送SN请求消息。
  14. 一种光网络单元ONU，包括：
    第一发送模块，用于当未接收到光线路终端OLT的下行信号，向所述OLT发送上行探测信号。
  15. 一种光线路终端OLT，包括：
    第二发送模块，用于上电后保持下行信号关闭，直至接收到光网络单元ONU的上行探测信号；以及，当接收到光网络单元ONU的上行探测信号，向所述ONU发送下行信号。
  16. 一种光网络系统，包括光线路终端OLT和光网络单元ONU，其中，
    所述ONU包括第一发送模块，用于当未接收到光线路终端OLT的下行信号，向所述OLT发送上行探测信号；
    所述OLT包括第二发送模块，用于上电并检测光网络单元ONU的上行探测信号；以及，当接收到光网络单元ONU的上行探测信号，向所述ONU发送下行信号。
  17. 一种光网络单元ONU，包括：
    处理器和存储器；
    所述存储器上存储有程序指令，所述程序指令当被所述处理器执行时使得所述处理器执行权利要求1-9任一项所述的信号传输方法。
  18. 一种光线路终端OLT，包括：
    处理器和存储器；
    所述存储器上存储有程序指令，所述程序指令当被所述处理器执行时使得所述处理器执行权利要求10-13任一项所述的信号传输方法。
  19. 一种计算机可读存储介质，存储有程序指令，所述程序指令被计算机执行时，实现：权利要求1-9任一项所述的信号传输方法，或者权利要求10-13任一项所述的信号传输方法。
PCT/CN2023/087880 2022-04-19 2023-04-12 信号传输方法、光网络单元和光线路终端 WO2023202446A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210409964.6A CN116962914A (zh) 2022-04-19 2022-04-19 信号传输方法、光网络单元和光线路终端
CN202210409964.6 2022-04-19

Publications (1)

Publication Number Publication Date
WO2023202446A1 true WO2023202446A1 (zh) 2023-10-26

Family

ID=88419133

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2023/087880 WO2023202446A1 (zh) 2022-04-19 2023-04-12 信号传输方法、光网络单元和光线路终端

Country Status (2)

Country Link
CN (1) CN116962914A (zh)
WO (1) WO2023202446A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118612016A (zh) * 2024-08-08 2024-09-06 宇洪通信技术(武汉)有限公司 Fttr主网关以及主网关终端光接口的定位方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103414510A (zh) * 2013-08-12 2013-11-27 浙江宇视科技有限公司 一种epon网络保护装置和方法
CN105577265A (zh) * 2014-10-17 2016-05-11 中兴通讯股份有限公司 无源光网络系统的上行波长通道的校准方法及光网络单元
US20180139006A1 (en) * 2016-11-17 2018-05-17 Google Inc. Optical Network Unit Wavelength Tuning
CN108924674A (zh) * 2018-06-26 2018-11-30 瑞斯康达科技发展股份有限公司 光网络系统及其监控管理方法
CN109392316A (zh) * 2017-06-09 2019-02-26 Nec平台株式会社 Pon系统和通信控制方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103414510A (zh) * 2013-08-12 2013-11-27 浙江宇视科技有限公司 一种epon网络保护装置和方法
CN105577265A (zh) * 2014-10-17 2016-05-11 中兴通讯股份有限公司 无源光网络系统的上行波长通道的校准方法及光网络单元
US20180139006A1 (en) * 2016-11-17 2018-05-17 Google Inc. Optical Network Unit Wavelength Tuning
CN109392316A (zh) * 2017-06-09 2019-02-26 Nec平台株式会社 Pon系统和通信控制方法
CN108924674A (zh) * 2018-06-26 2018-11-30 瑞斯康达科技发展股份有限公司 光网络系统及其监控管理方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118612016A (zh) * 2024-08-08 2024-09-06 宇洪通信技术(武汉)有限公司 Fttr主网关以及主网关终端光接口的定位方法

Also Published As

Publication number Publication date
CN116962914A (zh) 2023-10-27

Similar Documents

Publication Publication Date Title
CN109417424B (zh) 光网络单元重置消息
US8699885B2 (en) Power control in an optical network unit
US10367693B2 (en) Service configuration data processing method and apparatus
KR101273201B1 (ko) 통신 시스템에서 단말 소프트웨어의 동시 업데이트 방법 및 장치
US10505637B2 (en) Service processing method and apparatus and optical line terminal
WO2023202446A1 (zh) 信号传输方法、光网络单元和光线路终端
JP6400111B2 (ja) 光回線終端／光ネットワークユニット波長調節方法及び装置
EP2966798B1 (en) Active and standby changeover method, apparatus, device, and system for network device
WO2017193815A1 (zh) Sdn管理控制的方法、装置及系统、olt
WO2021259216A1 (zh) 一种认证方法、装置、设备及存储介质
US11337259B2 (en) Method for automatic connection between smart device and router, corresponding router and smart device
WO2009121308A1 (zh) 光网络数据处理方法、装置和系统
US20220116269A1 (en) Apparatus and methods for synchronization pattern configuration in an optical network
EP4216567A1 (en) Networking method and apparatus for passive optical network
WO2016015216A1 (zh) 以太网无源光网络系统中设备注册和波长切换的方法和装置
US9178619B2 (en) Passive optical network (PON)-based system and method for providing handover among optical network terminals (ONTs)
US10284298B2 (en) Method for awaking optical network unit in passive optical network, device, and system
WO2014177111A1 (zh) 光网络单元onu数据处理方法、装置及系统
US9137195B2 (en) Method, network device and user equipment for switching media access control address
EP3474490A1 (en) Service activating method, device and system, and storage medium
US20230225010A1 (en) Systems and methods for radio unit backup connections
CN112788441A (zh) 光网络单元的模式控制方法、装置、存储介质及设备
US20180359235A1 (en) Transmission apparatus and communication method
CN102055598A (zh) 一种实现点到多点802.3ah协议OAM的方法及系统
CN101252525B (zh) 一种pon网络中的链路备份方法和设备

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23791101

Country of ref document: EP

Kind code of ref document: A1