WO2019128953A1 - 光线路终端的单板及光线路终端 - Google Patents

光线路终端的单板及光线路终端 Download PDF

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Publication number
WO2019128953A1
WO2019128953A1 PCT/CN2018/123327 CN2018123327W WO2019128953A1 WO 2019128953 A1 WO2019128953 A1 WO 2019128953A1 CN 2018123327 W CN2018123327 W CN 2018123327W WO 2019128953 A1 WO2019128953 A1 WO 2019128953A1
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WIPO (PCT)
Prior art keywords
signal
optical module
detecting device
optical
module
Prior art date
Application number
PCT/CN2018/123327
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English (en)
French (fr)
Inventor
张迎
李远谋
李进
Original Assignee
华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP18896500.8A priority Critical patent/EP3720016B1/en
Publication of WO2019128953A1 publication Critical patent/WO2019128953A1/zh
Priority to US16/913,818 priority patent/US11429551B2/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/40—Bus structure
    • G06F13/4063—Device-to-bus coupling
    • G06F13/4068—Electrical coupling
    • G06F13/4086—Bus impedance matching, e.g. termination
    • 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
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0779—Monitoring line transmitter or line receiver equipment
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06E—OPTICAL COMPUTING DEVICES; COMPUTING DEVICES USING OTHER RADIATIONS WITH SIMILAR PROPERTIES
    • G06E1/00—Devices for processing exclusively digital data
    • G06E1/02—Devices for processing exclusively digital data operating upon the order or content of the data handled
    • 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
    • H04B10/27—Arrangements for networking
    • 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
    • H04B10/40—Transceivers

Definitions

  • the present application relates to the field of optical communications, and in particular to a single board and an optical line terminal of an optical line terminal.
  • the optical module is an abbreviation of the optical transceiver module, which mainly performs the functions of receiving and transmitting optical signals, mutual conversion of optical signals and electrical signals, and related detection and diagnosis of optical signals.
  • An optical line termination consists of at least one optical module and a single board.
  • a single board usually integrates multiple service ports, and each service port is equipped with one optical module.
  • MAC Media Access Control
  • the in-position signal is transmitted, and the MAC unit determines whether the corresponding optical module is in place by the in-position signal.
  • the miniaturization of the optical module means that the number of pins of the optical module is reduced, and the number of pins on the optical module is large, resulting in a large volume of the optical module. Therefore, it is imperative to reduce the dependence of the optical module on the in-position pin.
  • the present application discloses a single board and an optical line terminal of an optical line terminal.
  • the technical solution is as follows:
  • a single board of an optical line terminal includes a level adjustment circuit, a detecting device, and a control device, and the level adjusting circuit is electrically connected to an input end of the detecting device, and An input end of the detecting device and the level adjusting circuit are further configured to connect an uplink optical signal detecting pin of the optical module, an output end of the detecting device is connected to an input end of the control device, and the control device The output is used to connect the optical module, wherein:
  • the control device is configured to send a RESET signal to the optical module according to a first preset period
  • the control device allocates a corresponding transmission period of the uplink optical signal to each ONU, and ensures that each ONU operates in a time division multiplexed mode, that is, the control device stores the uplink optical signal of all ONUs connected to the OLT to which the control device belongs. Send cycle.
  • the level adjustment circuit is configured to output a first level signal to the detecting device when the detecting device is disconnected from the optical module;
  • the detecting device is configured to receive an indication signal output by the uplink optical signal detecting pin when the detecting device is connected to the optical module, and further configured to continuously perform the received first level signal and The indication signal is detected, if the second level signal opposite to the first level signal is present in the signal received within the preset time period, the detecting device notifies the control device that the optical module is a bit, if the signal received in the predetermined duration does not have the second level signal, the detecting device notifies the control device that the optical module is not in position, wherein the preset duration is greater than The first preset period is described.
  • the detection device determines whether there is a second level signal in the received signal within the preset duration every time the preset time is exceeded. In order to ensure that the control device must send a RESET signal to the optical module within a preset time period, the preset duration needs to be greater than the first A preset period.
  • the board of the optical line terminal receives the indication signal sent by the optical module or the first level signal sent by the level adjustment circuit through the detecting device, and notifies the control according to the condition of the received signal according to a preset rule. Whether the optical module of the device is in position, because the detection device realizes the function of detecting the position of the optical module, it is not necessary to set the in-position pin on the optical module, thereby reducing the dependence of the optical module on the in-position pin, and reducing the number of pins of the optical module. the goal of.
  • the level adjustment circuit is a pull-up circuit, and the first level signal is a high level signal; the detecting device, configured to receive an optical signal detected by the uplink optical signal detecting pin to detect an SD signal when the detecting device is connected to the optical module; and to continuously receive the received signal The first level signal and the SD signal are detected, and if a low level signal is present in a signal received within a preset time period, the detecting device notifies the control device that the optical module is in place, if If the signal received within the preset duration does not have a low level signal, the detecting device notifies the control device that the optical module is not in position.
  • the optical module When receiving the uplink optical signal sent by the ONU and not receiving the RESET signal, the optical module sets the SD signal to a high level. If the RESET signal is not received after the uplink optical signal ends, the SD signal is kept at a high level. .
  • the optical module generates an SD signal based on the RESET signal and the upstream optical signal, and is classified into at least the following cases:
  • the optical module simultaneously receives the upstream optical signal and the RESET signal at a certain time, and sets the SD signal to a low level;
  • the optical module receives only the upstream optical signal at a certain time, and sets the SD signal to a high level
  • the optical module receives only the RESET signal at a certain time, and sets the SD signal to a low level
  • the optical module does not receive any signal at a certain moment, and maintains the SD signal at the level of the previous moment or falls back to the low level.
  • the pull-up circuit includes a current source, The current source is electrically connected to the input end of the detecting device, and the current source is further used to connect the upstream optical signal detecting pin of the optical module.
  • the pull-up circuit includes a pull-up resistor, one end of the pull-up resistor The other end is connected to the input end of the detecting device, and the other end is further connected to the upstream optical signal detecting pin of the optical module.
  • the level adjustment circuit is a pull-down circuit, the first level signal a low-level signal; the detecting device, configured to receive an optical signal output LOS signal output by the upstream optical signal detecting pin when the detecting device is connected to the optical module; The first level signal and the LOS signal are detected, and if there is a high level signal in the signal received within the preset time period, the detecting device notifies the control device that the optical module is in position. If the signal received within the preset duration does not have a high level signal, the detecting means notifies the control device that the optical module is not in position.
  • the optical module When receiving the uplink optical signal sent by the ONU and not receiving the RESET signal, the optical module sets the LOS signal to a low level. If the RESET signal is not received after the end of the uplink optical signal, the LOS signal is kept low. .
  • the optical module generates the LOS signal based on the RESET signal and the upstream optical signal, and is classified into at least the following cases:
  • the optical module simultaneously receives the upstream optical signal and the RESET signal at a certain time, and sets the LOS signal to a high level
  • the optical module receives only the upstream optical signal at a certain time, and sets the LOS signal to a low level
  • the optical module only receives the RESET signal at a certain time, and sets the LOS signal to a high level
  • the optical module does not receive any signal at a certain moment, and keeps the LOS signal at the previous level or rises to the high level.
  • the pull-down circuit includes a pull-down resistor, and the first end of the pull-down resistor is grounded The second end of the pull-down resistor is electrically connected to the input end of the detecting device, and the second end of the pull-down resistor is further configured to connect the upstream optical signal detecting pin of the optical module.
  • control device is a media access control MAC module.
  • the control device comprises a MAC module and a central processing unit CPU, the detecting device The output end is connected to the input end of the CPU, the output end of the CPU is connected to the input end of the MAC module, and the output end of the MAC module is used to connect the optical module, wherein: the MAC module, And configured to send a RESET signal to the optical module according to a first preset period; and the detecting device is configured to: if there is a second level opposite to the first level signal in a signal received within a preset time period Signaling, the detecting means notifying the CPU that the optical module is in position, and if the signal received within the preset duration does not have the second level signal, the detecting means notifying the CPU The light module is not in position; the CPU is configured to notify the MAC module that the optical module is in position when the detecting device notifies that the optical module is in position; and when the optical module is
  • control device comprises an interconnected MAC module and a CPU, the detecting device The output end is connected to the input end of the MAC module, and the output end of the MAC module is used to connect the optical module, where:
  • the detecting device is configured to notify the MAC module that the optical module is in place if a second level signal opposite to the first level signal exists in a signal received within a preset time period, If the signal received within the preset duration does not have the second level signal, the detecting device notifies the MAC module that the optical module is not in the bit;
  • the MAC module is configured to send a RESET signal to the optical module according to a first preset period; and notify the CPU that the optical module is in position when the detecting device notifies that the optical module is in position; When the detecting device notifies that the optical module is not in position, the CPU is notified that the optical module is not in position.
  • the control device comprises an interconnected MAC module and a CPU, the detecting device The output of the MAC module is connected to the input of the CPU and the input of the MAC module, and the output of the MAC module is used to connect the optical module, where:
  • the MAC module is configured to send a RESET signal to the optical module according to a first preset period
  • the detecting means is configured to notify the CPU and the MAC module if a second level signal opposite to the first level signal exists in a signal received within a preset time period The light module is in position, and if the signal received within the preset time period does not have the second level signal, the detecting device notifies the CPU and the MAC module that the optical module is not in position.
  • the board further includes the optical module.
  • the preset duration is a second preset period.
  • an optical line terminal characterized in that the OLT comprises a single board as described in the first aspect.
  • FIG. 1 is a schematic structural diagram of a system of a PON communication system to which an embodiment of the present application is applied;
  • FIG. 2 is a schematic structural diagram of an OLT applied to an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of an OLT applied to another embodiment of the present application.
  • FIG. 4 is a flowchart of an optical module in-position detection method provided by an exemplary embodiment of the present application.
  • FIG. 5A is a flowchart of a method for detecting an in-position of an optical module according to another exemplary embodiment of the present application.
  • FIG. 5B is a flowchart of a method for detecting an in-position of an optical module according to still another exemplary embodiment of the present application.
  • FIG. 5C is a flowchart of a method for detecting an in-position of an optical module according to still another exemplary embodiment of the present application.
  • 6A is a schematic structural diagram of a level adjustment circuit applied to an embodiment of the present application.
  • 6B is a schematic structural diagram of a level adjustment circuit applied to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a principle of a single board of an optical line terminal according to an exemplary embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a level adjustment circuit applied to another embodiment of the present application.
  • FIG. 9 is a schematic diagram of a principle of a single board of an optical line terminal according to another exemplary embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of a system of a PON communication system according to an embodiment of the present application.
  • the system structure of the PON communication system includes at least: a plurality of optical network units (ONUs) and at least one light.
  • An optical distribution network (ODN) and an OLT are used in the OLT of the OLT.
  • the ONU is configured to receive the broadcast data sent by the OLT, the ranging and power control commands sent by the corresponding OLT, and the Ethernet data of the cached user, and uplink the cached Ethernet data in a sending period allocated by the OLT for the ONU. Send in the direction.
  • ODN used to provide optical transmission channels between the OLT and the ONU.
  • the OLT is configured to send broadcast data to the ONU, allocate a corresponding transmission period for each ONU, and receive Ethernet data (abbreviated as an uplink optical signal) sent by the ONU in the uplink direction.
  • Ethernet data abbreviated as an uplink optical signal
  • a single service port of the OLT is generally connected to multiple ONUs through the ODN to form a service channel.
  • the service port 1 of the OLT is connected to the ONU 1, ONU 2, and ONU N through the ODN. a business channel).
  • a GPON OLT in a GPON communication system, includes multiple service ports, and each service port is connected to multiple GPON ONUs.
  • one XGPON OLT in the XGPON communication system, includes multiple service ports, and each service port is connected. There are multiple XGPON ONUs.
  • the board includes at least: the board includes at least a level adjusting circuit, a detecting device, and a control device.
  • the level adjustment circuit is electrically connected to the input end of the detecting device, and the input end of the detecting device and the level adjusting circuit are further configured to connect the upstream optical signal detecting pin of the optical module, and the output end of the detecting device and the control device The input is connected and the output of the control unit is used to connect the optical module.
  • the level adjusting circuit and the detecting device may be located in the control device, or may be located in a Complex Programmable Logic Device (CPLD) on the single board, or may be located in a single device independent of the control device and the CPLD. On the board.
  • CPLD Complex Programmable Logic Device
  • FIG. 3 is a schematic structural diagram of a board to which an embodiment of the present application is applied, and the board further includes an optical module.
  • the optical module is used for photoelectric conversion. Receiving the uplink optical signal sent by the ONU, converting the received uplink optical signal into an electrical signal and transmitting the signal to the MAC module, and receiving the electrical signal sent by the MAC module, and converting the received electrical signal into a downlink optical signal and transmitting the signal to the ONU.
  • FIG. 4 is a flowchart of an optical module in-position detection method provided by an exemplary embodiment of the present application. This embodiment uses the method for the OLT to be exemplified. As shown in FIG. 4, the optical module in-position detection method includes:
  • Step 401 The control device sends a RESET signal to the optical module according to the first preset period.
  • the control device sends a RESET signal to the optical module through the output end according to the first preset period.
  • the optical module receives the RESET signal sent by the control device through the input end.
  • the control device allocates a corresponding transmission period of the uplink optical signal to each ONU, and ensures that each ONU operates in a time division multiplexed mode, that is, the control device stores the uplink optical signal of all ONUs connected to the OLT to which the control device belongs. Send cycle.
  • the control device sends a RESET signal to the optical module to control the corresponding circuit reset in the optical module to receive the current optical signal (or correctly indicate the no-light state through the SD signal). ). Therefore, in order to ensure that the optical module receives the RESET signal sent by the control device while receiving the uplink optical signal, the transmission period of each ONU associated with the optical module is an integer multiple of the first preset period.
  • control device needs to send the RESET signal according to the first preset period to ensure the effective implementation of step 402 after the optical module is inserted into the service port of the OLT.
  • Step 402 When the detecting device is disconnected from the optical module, the level adjusting circuit outputs a first level signal to the detecting device.
  • the level adjustment circuit is a pull-up circuit
  • the first level signal is a high level signal
  • the level adjustment circuit is a pull-down circuit
  • the first level signal is a low level signal
  • Step 403 When the detecting device is connected to the optical module, the detecting device receives the indication signal output by the uplink optical signal detecting pin.
  • Step 404 the detecting device continuously detects the received first level signal and the indication signal, and if there is a second level signal opposite to the first level signal in the received signal within the preset time period, the detecting device Notifying the control device that the optical module is in position, if the signal received within the preset duration does not have the second level signal, the detecting device notifies the control device that the optical module is not in position, wherein the preset duration is greater than the first preset period.
  • the preset duration is a second preset period.
  • the optical module Since the RESET signal is received by the control device according to the first preset period when the optical module is in position, the optical module receives the RESET signal every first preset period, and sends the second level signal to the detecting device. That is, as long as the optical module is in position, the detecting device can receive the indication signal of the second level signal sent by the optical module every first preset period.
  • the detecting device determines whether there is a second level signal in the received signal in the second preset period every second preset period, in order to ensure that the control device must send the RESET signal to the optical module in the second preset period,
  • the second preset period needs to be greater than the first preset period.
  • the board of the optical line terminal receives the indication signal sent by the optical module or the first level signal sent by the level adjustment circuit through the detecting device, and notifies the control according to the condition of the received signal according to a preset rule. Whether the optical module of the device is in position, because the detecting device realizes the function of the in-position pin of the optical module, it is not necessary to set the in-position pin on the optical module, thereby reducing the dependence of the optical module on the in-position pin, and reducing the tube of the optical module. The purpose of the number of feet.
  • FIG. 5A illustrates a flowchart of an optical module in-position detection method provided by another exemplary embodiment of the present application.
  • the control device is a media access control MAC module, or includes a MAC module and a central processing unit (CPU).
  • CPU central processing unit
  • the control device includes the MAC module and the CPU
  • the connection relationship between the optical module, the detecting device, the MAC module, and the central processing unit CPU is: the output end of the detecting device is connected to the input end of the CPU, and the output end of the CPU and the MAC module are The input is connected, and the output of the MAC module is used to connect the optical module.
  • Step 501 The MAC module sends a RESET signal to the optical module according to the first preset period.
  • Step 502 When the detecting device is disconnected from the optical module, the level adjusting circuit outputs a first level signal to the detecting device.
  • Step 503 When the detecting device is connected to the optical module, the detecting device receives the indication signal output by the uplink optical signal detecting pin.
  • Step 504 The first level signal and the indication signal continuously received by the detecting device are detected. If there is a second level signal opposite to the first level signal in the received signal within the preset time period, the detecting device notifies The CPU optical module is in position. If the signal received within the preset duration does not have a second level signal, the detecting device notifies the CPU that the optical module is out of position.
  • Step 505 When the detected device notifies the optical module that the optical module is in position, the CPU notifies the MAC module that the optical module is in position, and when the detected device notifies that the optical module is not in the bit, notifies the MAC module that the optical module is not in position.
  • steps 501 to 504 are similar to the steps 401 to 404. Therefore, the description of the steps 501 to 504 is not repeated in this embodiment.
  • FIG. 5B illustrates a flowchart of an optical module in-position detection method provided by another exemplary embodiment of the present application.
  • the connection relationship between the optical module, the detecting device, the MAC module and the CPU is: the output end of the detecting device is connected to the input end of the MAC module, and the output end of the MAC module is used for Connect the optical module.
  • Step 601 The MAC module sends a RESET signal to the optical module according to the first preset period.
  • Step 602 When the detecting device is disconnected from the optical module, the level adjusting circuit outputs a first level signal to the detecting device.
  • Step 603 When the detecting device is connected to the optical module, the detecting device receives the indication signal output by the uplink optical signal detecting pin.
  • Step 604 the first level signal and the indication signal continuously received by the detecting device are detected. If there is a second level signal opposite to the first level signal in the received signal within the preset time period, the detecting device notifies The MAC module optical module is in position. If the signal received within the preset duration does not have a second level signal, the detecting device notifies the MAC module that the optical module is not in position.
  • Step 605 The MAC module notifies the CPU that the optical module is in position when the detected device is notified that the optical module is in position, and notifies the CPU that the optical module is absent when the detected device notifies that the optical module is not in position.
  • steps 601 to 603 are similar to the steps 401 to 403. Therefore, the description of the steps 501 to 503 is not repeated in this embodiment.
  • FIG. 5C illustrates a flowchart of an optical module in-position detection method provided by another exemplary embodiment of the present application.
  • the connection relationship between the optical module, the detecting device, the MAC module and the CPU is: the output of the detecting device is respectively connected to the input end of the CPU and the input end of the MAC module, MAC The output of the module is used to connect the optical module.
  • Step 701 The MAC module sends a RESET signal to the optical module according to the first preset period.
  • Step 702 when the detecting device is disconnected from the optical module, the level adjusting circuit outputs a first level signal to the detecting device.
  • Step 703 When the detecting device is connected to the optical module, the detecting device receives the indication signal output by the uplink optical signal detecting pin.
  • Step 704 The first level signal and the indication signal continuously received by the detecting device are detected. If there is a second level signal opposite to the first level signal in the received signal within the preset time period, the detecting device notifies The CPU and the MAC module optical module are in position. If the signal received within the preset duration does not have the second level signal, the detecting device notifies the CPU and the MAC module that the optical module is out of position.
  • steps 701 to 703 are similar to the steps 401 to 403. Therefore, the description of the steps 701 to 703 is not repeated in this embodiment.
  • the indication signal is an SD signal
  • the level adjustment circuit is a pull-up circuit
  • the first level signal is a high level signal
  • Step 403 can be replaced by: when the detecting device is connected to the optical module, the detecting device receives the optical signal detecting SD signal output by the upstream optical signal detecting pin.
  • the optical module When receiving the uplink optical signal sent by the ONU and not receiving the RESET signal, the optical module sets the SD signal to a high level. If the RESET signal is not received after the uplink optical signal ends, the SD signal is kept at a high level. .
  • the optical module generates an SD signal based on the RESET signal and the upstream optical signal, and is classified into at least the following cases:
  • the optical module simultaneously receives the upstream optical signal and the RESET signal at a certain time, and sets the SD signal to a low level;
  • the optical module receives only the upstream optical signal at a certain time, and sets the SD signal to a high level
  • the optical module receives only the RESET signal at a certain time, and sets the SD signal to a low level
  • the optical module does not receive any signal at a certain moment, and maintains the SD signal at the level of the previous moment or falls back to the low level.
  • Step 404 can be replaced by: detecting means continuously detecting the received first level signal and SD signal, and if there is a low level signal in the received signal within the preset time period, the detecting means notifying the control device optical module In position, if there is no low level signal in the signal received within the preset time period, the detecting device notifies the control device that the optical module is not in position.
  • FIG. 6A shows a schematic structural diagram of a level adjustment circuit applied to an embodiment of the present application
  • the level adjustment circuit is a pull-up circuit.
  • the pull-up circuit includes a current source electrically connected to the input end of the detecting device, and the current source is further configured to connect the upstream optical signal detecting pin of the optical module.
  • FIG. 6B illustrates a schematic structural diagram of a level adjustment circuit applied to another embodiment of the present application, the level adjustment circuit being a pull-up circuit.
  • the pull-up circuit includes a pull-up resistor. One end of the pull-up resistor is connected to the power source, the other end is connected to the input end of the detecting device, and the other end is also used to connect the upstream optical signal detecting pin of the optical module.
  • FIG. 7 is a schematic diagram showing the principle of a single board of an optical line terminal provided by an exemplary embodiment of the present application.
  • the optical module in-position detection method will be described below with reference to FIGS. 6B and 7. It should be noted that the optical module is not in position before the first time period. Between the first time period and the second time period, between the second time period and the third time period, between the third time period and the fourth time period, and between the fourth time period and the fifth time period are separated by a first preset period. For example, the optical module does not receive any signal at a certain moment, and maintains the SD signal at the level of the previous moment.
  • the optical module receives the RESET signal sent by the control device while receiving the uplink optical signal by the ONU1.
  • the input end of the detecting device receives the SD signal of the low level sent by the optical module.
  • the optical module receives the uplink optical signal from the ONU1, and does not receive the RESET signal sent by the control device. At this time, the input end of the detecting device receives the high level SD signal sent by the optical module.
  • the optical module does not receive the uplink optical signal sent by the ONU1 and the RESET signal sent by the control device.
  • the optical module continuously sends the high-level SD signal sent to the detecting module in the previous stage (ie, the second stage) to the inverter, and correspondingly, the input end of the detecting device receives the high level sent by the optical module. SD signal.
  • the detecting device can detect the low level signal in the second preset period including the first period, and the detecting device notifies the control device that the optical module is in position (FIG. 7). As shown, the detecting device transmits a high level signal for indicating that the optical module is in position to the control device during the first time period.
  • the optical module receives the RESET signal sent by the control device while receiving the uplink optical signal from the ONU2.
  • the optical module receives the uplink optical signal from the ONU2, and does not receive the RESET signal sent by the control device.
  • the optical module does not receive the uplink optical signal sent by the ONU2 and the RESET signal sent by the control device.
  • the optical module and the detecting device in the first phase of the second time period are similar to the optical module and the detecting device in the first phase of the first time period
  • the optical module and the detecting device in the second phase of the second time period Similar to the case of the light module and the detecting device in the second phase of the first time period, the light module and the detecting device in the third phase of the second time period are similar to the case of the light module and the detecting device in the third phase of the first time period, thus The embodiment does not describe the situation of the optical module and the detecting device in the second time period.
  • the detecting device notifies the control device that the optical module is in the same position, and the detecting device sends a high level signal to the control device during the second time period.
  • the detecting device can detect the low level signal in the second preset period including the first period, and the detecting device notifies the control device that the optical module is in position (FIG. 7). As shown, the detecting means transmits a high level signal to the control means during the first time period).
  • the optical module receives the RESET signal sent by the control device while receiving the uplink optical signal by the ONU1.
  • the optical module receives the uplink optical signal from the ONU1, and does not receive the RESET signal sent by the control device.
  • the optical module and the detecting device in the first phase of the third time period are similar to the optical module and the detecting device in the first phase of the first time period, the optical module and the detecting device in the second phase of the third time period Similar to the case of the optical module and the detecting device in the second phase of the first time period, therefore, the present embodiment will not repeat the description of the optical module and the detecting device in the third time period.
  • the detecting device notifies the control device that the optical module is in the same position, and the detecting device sends a high level signal to the control device during the third time period.
  • the optical module does not receive the upstream optical signal, but receives the RESET signal sent by the control device.
  • the input end of the detecting device receives the SD signal of the low level sent by the optical module.
  • the optical module does not receive the upstream optical signal and the RESET signal.
  • the optical module continuously sends the low-level SD signal sent to the detecting device in the previous stage (ie, the second phase) to the detecting device, and correspondingly, the input end of the detecting device receives the low-level signal sent by the optical module. .
  • control device optical module is informed that the detection device transmits a high level signal to the control device during the fourth time period.
  • the optical module is disconnected from the indication signal (ie, the optical module is pulled out from the OLT), and the control device cannot receive the RESET signal.
  • the input end of the detecting device receives the high level signal sent by the level adjusting circuit.
  • the optical module is disconnected from the indication signal (ie, the optical module is pulled out from the OLT), and the control device does not send the RESET signal.
  • the input end of the detecting device receives the high level signal sent by the level adjusting circuit.
  • the detecting device since the second preset period is greater than the first preset period, when the detecting device does not detect the low level signal in the second preset period including the first period, the detecting device notifies the control device that the optical module is not in position (as shown in FIG. As shown in FIG. 7, the detecting means transmits a low level in-position signal to the control means during the fifth period.
  • the board of the optical line terminal receives the indication signal sent by the optical module or the first level signal sent by the level adjustment circuit through the detecting device, and notifies the control according to the condition of the received signal according to a preset rule. Whether the optical module of the device is in position, because the detecting device realizes the function of the in-position pin of the optical module, it is not necessary to set the in-position pin on the optical module, thereby reducing the dependence of the optical module on the in-position pin, and reducing the tube of the optical module. The purpose of the number of feet.
  • the indication signal is the LOS signal
  • the level adjustment circuit is a pull-down circuit
  • the first level signal is a low level signal.
  • Step 403 can be replaced by: when the detecting device is connected to the optical module, the detecting device receives the optical signal loss LOS signal output by the upstream optical signal detecting pin.
  • the optical module When receiving the uplink optical signal sent by the ONU and not receiving the RESET signal, the optical module sets the LOS signal to a low level. If the RESET signal is not received after the end of the uplink optical signal, the LOS signal is kept low. .
  • the optical module generates the LOS signal based on the RESET signal and the upstream optical signal, and is classified into at least the following cases:
  • the optical module simultaneously receives the upstream optical signal and the RESET signal at a certain time, and sets the LOS signal to a high level
  • the optical module receives only the upstream optical signal at a certain time, and sets the LOS signal to a low level
  • the optical module only receives the RESET signal at a certain time, and sets the LOS signal to a high level
  • the optical module does not receive any signal at a certain moment, and keeps the LOS signal at the previous level or rises to the high level.
  • Step 404 can be replaced by: detecting means continuously detecting the received first level signal and LOS signal, and if there is a high level signal in the signal received within the preset time period, the detecting means notifying the control device optical module In position, if there is no high level signal in the signal received within the preset time period, the detecting device notifies the control device that the optical module is not in position.
  • FIG. 8 is a schematic structural diagram of a level adjustment circuit applied to another embodiment of the present application, where the level adjustment circuit is a pull-down circuit.
  • the pull-down circuit includes a pull-down resistor, the first end of the pull-down resistor is grounded, the second end of the pull-down resistor is electrically connected to the input end of the detecting device, and the second end of the pull-down resistor is further used for detecting the upstream optical signal of the optical module. Pin.
  • FIG. 9 is a schematic diagram showing the principle of a single board of an optical line terminal provided by another exemplary embodiment of the present application.
  • the optical module in-position detection method will be described below with reference to FIGS. 8 and 9. It should be noted that the optical module is not in position before the first time period. Between the first time period and the second time period, between the second time period and the third time period, between the third time period and the fourth time period, and between the fourth time period and the fifth time period are separated by a first preset period. For example, the optical module does not receive any signal at a certain moment, and the LOS signal is maintained at the level of the previous moment.
  • the optical module receives the RESET signal sent by the control device while receiving the uplink optical signal by the ONU1. At this time, the input end of the detecting device receives the high level LOS signal sent by the optical module.
  • the optical module receives the uplink optical signal from the ONU1, and does not receive the RESET signal sent by the control device. At this time, the input end of the detecting device receives the low level LOS signal sent by the optical module.
  • the optical module does not receive the uplink optical signal sent by the ONU1 and the RESET signal sent by the control device. At this time, the optical module continuously sends the LOS signal of the low level sent to the detecting module in the previous stage (ie, the second stage) to the detecting module, and correspondingly, the input end of the detecting device receives the low level sent by the optical module. LOS signal.
  • the detecting device can detect the LOS signal of the high level in the second preset period including the first period, and the detecting device notifies the control device that the optical module is in place (eg As shown in FIG. 9, the detecting means transmits a high level signal for indicating that the optical module is in position to the control means during the first time period.
  • the optical module receives the RESET signal sent by the control device while receiving the uplink optical signal from the ONU2.
  • the optical module receives the uplink optical signal from the ONU2, and does not receive the RESET signal sent by the control device.
  • the optical module does not receive the uplink optical signal sent by the ONU2 and the RESET signal sent by the control device.
  • the optical module and the detecting device in the first phase of the second time period are similar to the optical module and the detecting device in the first phase of the first time period
  • the optical module and the detecting device in the second phase of the second time period Similar to the case of the light module and the detecting device in the second phase of the first time period, the light module and the detecting device in the third phase of the second time period are similar to the case of the light module and the detecting device in the third phase of the first time period, thus The embodiment does not describe the situation of the optical module and the detecting device in the second time period.
  • the detecting device notifies the control device that the optical module is in the same position, and the detecting device sends a high level signal to the control device during the second time period.
  • the detecting device can detect the LOS signal of the high level in the second preset period including the first period, and the detecting device notifies the control device that the optical module is in place (eg As shown in FIG. 9, the detecting means transmits a high level signal to the control means during the first time period.
  • the optical module receives the RESET signal sent by the control device while receiving the uplink optical signal by the ONU1.
  • the optical module receives the uplink optical signal from the ONU1, and does not receive the RESET signal sent by the control device.
  • the optical module and the detecting device in the first phase of the third time period are similar to the optical module and the detecting device in the first phase of the first time period, the optical module and the detecting device in the second phase of the third time period Similar to the case of the optical module and the detecting device in the second phase of the first time period, therefore, the present embodiment will not repeat the description of the optical module and the detecting device in the third time period.
  • control device optical module is informed that the detection device transmits a high level signal to the control device during the third time period.
  • the optical module does not receive the upstream optical signal, but receives the RESET signal sent by the control device. At this time, the input end of the detecting device receives the high level LOS signal sent by the optical module.
  • the optical module does not receive the upstream optical signal and the RESET signal.
  • the optical module continuously sends the high-level LOS signal sent to the detecting device in the previous stage (ie, the second phase) to the detecting device, and correspondingly, the input end of the detecting device receives the high-level signal sent by the optical module. .
  • the detecting device notifies the control device that the optical module is in the same position, and the detecting device sends a high level signal to the control device during the fourth time period.
  • the optical module is disconnected from the indication signal (ie, the optical module is pulled out from the OLT), and the control device cannot receive the RESET signal.
  • the input end of the detecting device receives the low level signal sent by the level adjusting circuit.
  • the optical module is disconnected from the indication signal (ie, the optical module is pulled out from the OLT), and the control device does not send the RESET signal.
  • the input end of the detecting device receives the low level signal sent by the level adjusting circuit.
  • the detecting device since the second preset period is greater than the first preset period, when the detecting device does not detect the high level signal in the second preset period including the first period, the detecting device notifies the control device that the optical module is not in the position (as shown in FIG. As shown in FIG. 9, the detecting means transmits a low level signal for indicating that the optical module is not in the fifth time period to the control means.
  • the board of the optical line terminal receives the indication signal sent by the optical module or the first level signal sent by the level adjustment circuit through the detecting device, and notifies the control according to the condition of the received signal according to a preset rule. Whether the optical module of the device is in position, because the detecting device realizes the function of the in-position pin of the optical module, it is not necessary to set the in-position pin on the optical module, thereby reducing the dependence of the optical module on the in-position pin, and reducing the tube of the optical module. The purpose of the number of feet.
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

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Abstract

本申请公开了一种光线路终端的单板及光线路终端，涉及光通信领域。该光线路终端的单板包括电平调节电路、检测装置和控制装置，其中：检测装置，用于当检测装置与光模块连接时，接收上行光信号检测管脚输出的指示信号；还用于持续对接收到的第一电平信号和指示信号进行检测，如果在预设时长内接收到的信号中存在与第一电平信号相反的第二电平信号，则检测装置通知控制装置光模块在位，如果在预设时长内接收到的信号不存在第二电平信号，则检测装置通知控制装置光模块不在位，其中，预设时长大于第一预设周期。本申请检测装置实现了光模块的在位管脚的功能，降低光模块对在位管脚的依赖，达到减少光模块的管脚数量的目的。

Description

光线路终端的单板及光线路终端
本申请要求于2017年12月29日提交的申请号为201711488798.9、发明名称为“光线路终端的单板及光线路终端”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及光通信领域，特别是涉及一种光线路终端的单板及光线路终端。
背景技术
光模块是光收发一体模块的简称，主要完成光信号的接收与发送，光信号与电信号的相互转换，以及光信号的相关检测与诊断等功能。随着数字电路与光电技术的发展，光模块的集成度越来越高，封装越来越小，传送的速率更高。
一个光链路终端(Optical Line Termination，OLT)由至少一个光模块和一块单板组成，一块单板通常集成多个业务端口，每个业务端口分别装配一个光模块。为了让单板上的媒体接入控制(Media Access Control，MAC)模块感知每个光模块是否在位，需要在每个光模块的管脚中专门设置一个在位管脚，用于向MAC单元发送在位信号，MAC单元通过在位信号判断相应的光模块是否在位。
光模块小型化意味着光模块的管脚数量的减少，而光模块上管脚众多，导致光模块的体积较大，因此降低光模块对在位管脚的依赖势在必行。
发明内容
为了解决相关技术的问题，本申请公开了一种光线路终端的单板及光线路终端。所述技术方案如下：
第一方面，提供了一种光线路终端的单板，所述单板包括电平调节电路、检测装置和控制装置，所述电平调节电路电性连接于所述检测装置的输入端，且所述检测装置的输入端和所述电平调节电路还用于连接光模块的上行光信号检测管脚，所述检测装置的输出端与所述控制装置的输入端连接，且所述控制装置的输出端用于连接所述光模块，其中：
所述控制装置，用于按照第一预设周期向所述光模块发送RESET信号；
控制装置为每个ONU分配对应的上行光信号的发送周期，保证每个ONU以时分复用的模式工作，也就是说，控制装置存储有与该控制装置所属OLT连接所有ONU的上行光信号的发送周期。
所述电平调节电路，用于当所述检测装置与所述光模块断开连接时，向所述检测装置输出第一电平信号；
所述检测装置，用于当所述检测装置与所述光模块连接时，接收所述上行光信号检测管脚输出的指示信号；还用于持续对接收到的所述第一电平信号和所述指示信号进行检测，如果在预设时长内接收到的信号中存在与所述第一电平信号相反的第二电平信号，则所述检测装置通知所述控制装置所述光模块在位，如果在所述预设时长内接收到的信号不存在所述第二电平信号，则所述检测装置通知所述控制装置所述光模块不在位，其中，所述预 设时长大于所述第一预设周期。
检测装置每经过预设时长，判定预设时长内接收到的信号中是否存在第二电平信号，为了保证在预设时长内控制装置必定会向光模块发送RESET信号，预设时长需大于第一预设周期。
本申请实施例提供的光线路终端的单板，通过检测装置接收光模块发送的指示信号或电平调节电路发送的第一电平信号，并根据预设规则根据接收到的信号的情况通知控制装置光模块是否在位，由于检测装置实现了光模块在位检测的功能，无需在光模块上设置在位管脚，降低光模块对在位管脚的依赖，达到减少光模块的管脚数量的目的。
结合第一方面或者第一方面的第一种可能的实施方式，在第一方面的第二种可能的实施方式中，所述电平调节电路为上拉电路，所述第一电平信号为高电平信号；所述检测装置，用于当所述检测装置与所述光模块连接时，接收所述上行光信号检测管脚输出的光信号检测SD信号；还用于持续对接收到的所述第一电平信号和所述SD信号进行检测，如果在预设时长内接收到的信号中存在低电平信号，则所述检测装置通知所述控制装置所述光模块在位，如果在所述预设时长内接收到的信号不存在低电平信号，则所述检测装置通知所述控制装置所述光模块不在位。
光模块当接收到ONU发送的上行光信号，且未接收到RESET信号时，将SD信号设置为高电平，如果在上行光信号结束后未接收到RESET信号，则保持SD信号为高电平。
光模块基于RESET信号和上行光信号生成SD信号，至少分为下述几种情况：
第一种情况，光模块在某一时刻同时接收到上行光信号和RESET信号，将SD信号设置为低电平；
第二种情况，光模块在某一时刻仅接收到上行光信号，将SD信号设置为高电平；
第三种情况，光模块在某一时刻仅接收到RESET信号，将SD信号设置为低电平；
第四种情况，光模块在某一时刻未接收到任何信号，将SD信号保持上一时刻的电平状态或者回落到低电平。
结合第一方面、第一方面的第一种可能的实现或者第一方面的第二种可能的实现，在第一方面的第三种可能的实现中，所述上拉电路包括电流源，所述电流源电性连接于所述检测装置的输入端，且所述电流源还用于连接光模块的上行光信号检测管脚。
结合第一方面、第一方面的第一种至第三种可能的实现，在第一方面的第四种可能的实现中，所述上拉电路包括上拉电阻，所述上拉电阻的一端连接于电源，另一端连接于所述检测装置的输入端，且所述另一端还用于连接光模块的上行光信号检测管脚。
结合第一方面、第一方面的第一种至第四种可能的实现，在第一方面的第五种可能的实现中，所述电平调节电路为下拉电路，所述第一电平信号为低电平信号；所述检测装置，用于当所述检测装置与所述光模块连接时，接收所述上行光信号检测管脚输出的光信号丢失LOS信号；还用于持续对接收到的所述第一电平信号和所述LOS信号进行检测，如果在预设时长内接收到的信号中存在高电平信号，则所述检测装置通知所述控制装置所述光模块在位，如果在所述预设时长内接收到的信号不存在高电平信号，则所述检测装置通知所述控制装置所述光模块不在位。
光模块当接收到ONU发送的上行光信号，且未接收到RESET信号时，将LOS信号设置为低电平，如果在上行光信号结束后未接收到RESET信号，则保持LOS信号为低电平。
即光模块基于RESET信号和上行光信号生成LOS信号，至少分为下述几种情况：
第一种情况，光模块在某一时刻同时接收到上行光信号和RESET信号，将LOS信号设置为高电平；
第二种情况，光模块在某一时刻仅接收到上行光信号，将LOS信号设置为低电平；
第三种情况，光模块在某一时刻仅接收到RESET信号，将LOS信号设置为高电平；
第四种情况，光模块在某一时刻未接收到任何信号，将LOS信号保持上一时刻的电平状态或者回升到高电平。
结合第一方面、第一方面的第一种至第五种可能的实现，在第一方面的第六种可能的实现中，所述下拉电路包括下拉电阻，所述下拉电阻的第一端接地，所述下拉电阻的第二端电性连接于所述检测装置的输入端，且所述下拉电阻的第二端还用于连接光模块的上行光信号检测管脚。
结合第一方面、第一方面的第一种至第六种可能的实现，在第一方面的第七种可能的实现中，所述控制装置为媒体接入控制MAC模块。
结合第一方面、第一方面的第一种至第七种可能的实现，在第一方面的第八种可能的实现中，所述控制装置包括MAC模块和中央处理器CPU，所述检测装置的输出端与所述CPU的输入端连接，所述CPU的输出端与所述MAC模块的输入端连接，所述MAC模块的输出端用于连接所述光模块，其中：所述MAC模块，用于按照第一预设周期向所述光模块发送RESET信号；所述检测装置，用于如果在预设时长内接收到的信号中存在与所述第一电平信号相反的第二电平信号，则所述检测装置通知所述CPU所述光模块在位，如果在所述预设时长内接收到的信号不存在所述第二电平信号，则所述检测装置通知所述CPU所述光模块不在位；所述CPU，用于当被所述检测装置通知所述光模块在位时，通知所述MAC模块所述光模块在位；当被所述检测装置通知所述光模块不在位时，通知所述MAC模块所述光模块不在位。
结合第一方面、第一方面的第一种至第八种可能的实现，在第一方面的第九种可能的实现中，所述控制装置包括相互连接的MAC模块和CPU，所述检测装置的输出端与所述MAC模块的输入端连接，所述MAC模块的输出端用于连接所述光模块，其中：
所述检测装置，用于如果在预设时长内接收到的信号中存在与所述第一电平信号相反的第二电平信号，则所述检测装置通知MAC模块所述光模块在位，如果在所述预设时长内接收到的信号不存在所述第二电平信号，则所述检测装置通知MAC模块所述光模块不在位；
所述MAC模块，用于按照第一预设周期向所述光模块发送RESET信号；以及当被所述检测装置通知所述光模块在位时，通知所述CPU所述光模块在位；当被所述检测装置通知所述光模块不在位时，通知所述CPU所述光模块不在位。
结合第一方面、第一方面的第一种至第九种可能的实现，在第一方面的第十种可能的实现中，所述控制装置包括相互连接的MAC模块和CPU，所述检测装置的输出端分别与所述CPU的输入端和所述MAC模块的输入端连接，所述MAC模块的输出端用于连接所述光模块，其中：
所述MAC模块，用于按照第一预设周期向所述光模块发送RESET信号；
所述检测装置，用于如果在预设时长内接收到的信号中存在与所述第一电平信号相反 的第二电平信号，则所述检测装置通知所述CPU和所述MAC模块所述光模块在位，如果在所述预设时长内接收到的信号不存在所述第二电平信号，则所述检测装置通知所述CPU和所述MAC模块所述光模块不在位。
结合第一方面、第一方面的第一种至第十种可能的实现，在第一方面的第十一种可能的实现中，所述单板还包括所述光模块。
结合第一方面、第一方面的第一种至第十一种可能的实现，在第一方面的第十二种可能的实现中，所述预设时长为第二预设周期。
第二方面，提供了一种光线路终端，其特征在于，所述OLT包括如第一方面所述的单板。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请一个实施例应用的PON通信系统的系统结构示意图；
图2是本申请一个实施例应用的OLT的结构示意图；
图3是本申请另一个实施例应用的OLT的结构示意图；
图4是本申请一个示例性实施例提供的光模块在位检测方法的流程图；
图5A是本申请另一个示例性实施例提供的光模块在位检测方法的流程图；
图5B是本申请再一个示例性实施例提供的光模块在位检测方法的流程图；
图5C是本申请又一个示例性实施例提供的光模块在位检测方法的流程图；
图6A是本申请一个实施例应用的电平调节电路的结构示意图；
图6B是本申请一个实施例应用的电平调节电路的结构示意图；
图7是本申请一个示例性实施例提供的光线路终端的单板的原理示意图；
图8是本申请另一个实施例应用的电平调节电路的结构示意图；
图9是本申请另一个示例性实施例提供的光线路终端的单板的原理示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
请参考图1，其示出了本申请一个实施例应用的PON通信系统的系统结构示意图，该PON通信系统的系统结构至少包括：多个光网络单元(Optical Network Unit，ONU)、至少一个光配线网络(Optical Distribution Network，ODN)和一个OLT，本申请所涉及的OLT的单板应用于该OLT中。
ONU，用于接收OLT发送的广播数据，相应OLT发送的测距及功率控制命令，以及缓存用户的以太网数据，并在OLT为该ONU分配的发送周期内将所缓存的以太网数据向上行方向发送。
ODN，用于为OLT和ONU之间提供光传输通道。
OLT，用于向ONU发送广播数据，为每个ONU分配对应的发送周期，以及接收ONU发送向上行方向发送的以太网数据(简称上行光信号)。
在PON通信系统中，一般是以OLT的单个业务端口通过ODN接入多个ONU来组成一个业务通道(如图1中，OLT的业务端口1通过ODN接入ONU 1、ONU2和ONU N组成了一个业务通道)。
同理，在GPON通信系统中，一个GPON OLT包含多个业务端口，每个业务端口接入有多个GPON ONU；在XGPON通信系统中，一个XGPON OLT包含多个业务端口，每个业务端口接入有多个XGPON ONU。
请参考图2，其示出了本申请一个实施例应用的单板的结构示意图，该单板至少包括：单板至少包括电平调节电路、检测装置和控制装置。
其中，电平调节电路电性连接于检测装置的输入端，且检测装置的输入端和电平调节电路还用于连接光模块的上行光信号检测管脚，检测装置的输出端与控制装置的输入端连接，且控制装置的输出端用于连接光模块。
需要说明的是，电平调节电路和检测装置可以位于控制装置内，也可以位于单板上的复杂可编程逻辑器件(Complex Programmable Logic Device，CPLD)中，还可独立于控制装置和CPLD位于单板上。
请参考图3，其示出了本申请一个实施例应用的单板的结构示意图，单板还包括光模块。
其中，光模块用于光电转换。接收ONU发送的上行光信号，将接收到的上行光信号转换为电信号发送至MAC模块，以及接收MAC模块发送的电信号，将接收到的电信号转换为下行光信号发送至ONU。
接下来将结合附图详细描述图2所示的单板，和以该单板为基础实施的OLT。
实施例一
请参考图4，其示出了本申请一个示例性实施例提供的光模块在位检测方法的流程图。本实施例以该方法用于OLT的单板中来举例说明，如图4所示，该光模块在位检测方法包括：
步骤401，控制装置按照第一预设周期向光模块发送RESET信号。
控制装置按照第一预设周期通过输出端向光模块发送RESET信号。
对应的，光模块通过输入端接收控制装置发送的RESET信号。
控制装置为每个ONU分配对应的上行光信号的发送周期，保证每个ONU以时分复用的模式工作，也就是说，控制装置存储有与该控制装置所属OLT连接所有ONU的上行光信号的发送周期。
由于控制装置在光模块接收到某一上行光信号的同时，向光模块发送RESET信号，来控制光模块中相应的电路复位，以接收本次上行光信号(或者通过SD信号正确指示无光状态)。因此，为了保证光模块在接收到上行光信号的同时，接收到控制装置发送的RESET信号，该光模块所关联的每个ONU的发送周期为第一预设周期的整数倍。
需要说明的是，无论光模块是否插入OLT的业务端口，控制装置均需按照第一预设周期发送RESET信号，以保证在光模块插入OLT的业务端口后，步骤402的有效实施。
步骤402，当检测装置与光模块断开连接时，电平调节电路向检测装置输出第一电平信号。
可选的，电平调节电路为上拉电路，第一电平信号为高电平信号。
可选的，电平调节电路为下拉电路，第一电平信号为低电平信号。
步骤403，当检测装置与光模块连接时，检测装置接收上行光信号检测管脚输出的指示信号。
步骤404，检测装置持续对接收到的第一电平信号和指示信号进行检测，如果在预设时长内接收到的信号中存在与第一电平信号相反的第二电平信号，则检测装置通知控制装置光模块在位，如果在预设时长内接收到的信号不存在第二电平信号，则检测装置通知控制装置光模块不在位，其中，预设时长大于第一预设周期。
可选的，预设时长为第二预设周期。
由于在光模块在位的情况下，会接收到控制装置按照第一预设周期发送RESET信号，因此光模块每第一预设周期才会接收到RESET信号，向检测装置发送第二电平信号，也就是说，只要光模块在位，检测装置每第一预设周期就能接收到光模块发送的第二电平信号的指示信号。
检测装置每经过第二预设周期，判定第二预设周期内接收到的信号中是否存在第二电平信号，为了保证在第二预设周期内控制装置必定会向光模块发送RESET信号，第二预设周期需大于第一预设周期。
本申请实施例提供的光线路终端的单板，通过检测装置接收光模块发送的指示信号或电平调节电路发送的第一电平信号，并根据预设规则根据接收到的信号的情况通知控制装置光模块是否在位，由于检测装置实现了光模块的在位管脚的功能，无需在光模块上设置在位管脚，降低光模块对在位管脚的依赖，达到减少光模块的管脚数量的目的。
在一种可能实现的方式中，请参考图5A，其示出了本申请另一个示例性实施例提供的光模块在位检测方法的流程图。该控制装置为媒体接入控制MAC模块，或者包括MAC模块和中央处理器(Central Processing Unit，CPU)。
当控制装置包括MAC模块和CPU时，光模块、检测装置、MAC模块和中央处理器CPU之间的连接关系为：检测装置的输出端与CPU的输入端连接，CPU的输出端与MAC模块的输入端连接，MAC模块的输出端用于连接光模块。
步骤501，MAC模块按照第一预设周期向光模块发送RESET信号。
步骤502，当检测装置与光模块断开连接时，电平调节电路向检测装置输出第一电平信号。
步骤503，当检测装置与光模块连接时，检测装置接收上行光信号检测管脚输出的指示信号。
步骤504，检测装置持续接收到的第一电平信号和指示信号进行检测，如果在预设时长内接收到的信号中存在与第一电平信号相反的第二电平信号，则检测装置通知CPU光模块在位，如果在预设时长内接收到的信号不存在第二电平信号，则检测装置通知CPU光模块 不在位。
步骤505，CPU当被检测装置通知光模块在位时，通知MAC模块光模块在位，当被检测装置通知光模块不在位时，通知MAC模块光模块不在位。
需要说明的是，步骤501至步骤504与步骤401至步骤404类似，因此本实施例不在对步骤501至步骤504赘述说明。
在另一种可能实现的方式中，请参考图5B，其示出了本申请另一个示例性实施例提供的光模块在位检测方法的流程图。
当控制装置包括相互连接的MAC模块和CPU时，光模块、检测装置、MAC模块和CPU之间的连接关系为：检测装置的输出端与MAC模块的输入端连接，MAC模块的输出端用于连接光模块。
步骤601，MAC模块按照第一预设周期向光模块发送RESET信号。
步骤602，当检测装置与光模块断开连接时，电平调节电路向检测装置输出第一电平信号。
步骤603，当检测装置与光模块连接时，检测装置接收上行光信号检测管脚输出的指示信号。
步骤604，检测装置持续接收到的第一电平信号和指示信号进行检测，如果在预设时长内接收到的信号中存在与第一电平信号相反的第二电平信号，则检测装置通知MAC模块光模块在位，如果在预设时长内接收到的信号不存在第二电平信号，则检测装置通知MAC模块光模块不在位。
步骤605，MAC模块当被检测装置通知光模块在位时，通知CPU光模块在位；当被检测装置通知光模块不在位时，通知CPU光模块不在位。
需要说明的是，步骤601至步骤603与步骤401至步骤403类似，因此本实施例不在对步骤501至步骤503赘述说明。
在再一种可能实现的方式中，请参考图5C，其示出了本申请另一个示例性实施例提供的光模块在位检测方法的流程图。
当控制装置包括相互连接的MAC模块和CPU时，光模块、检测装置、MAC模块和CPU之间的连接关系为：检测装置的输出端分别与CPU的输入端和MAC模块的输入端连接，MAC模块的输出端用于连接光模块。
步骤701，MAC模块按照第一预设周期向光模块发送RESET信号。
步骤702，当检测装置与光模块断开连接时，电平调节电路向检测装置输出第一电平信号。
步骤703，当检测装置与光模块连接时，检测装置接收上行光信号检测管脚输出的指示信号。
步骤704，检测装置持续接收到的第一电平信号和指示信号进行检测，如果在预设时长内接收到的信号中存在与第一电平信号相反的第二电平信号，则检测装置通知CPU和MAC模块光模块在位，如果在预设时长内接收到的信号不存在第二电平信号，则检测装置通知CPU和MAC模块光模块不在位。
需要说明的是，步骤701至步骤703与步骤401至步骤403类似，因此本实施例不在对步骤701至步骤703赘述说明。
实施例二
第一种情况，指示信号是SD信号，电平调节电路为上拉电路，第一电平信号为高电平信号。
步骤403可被替换为：当检测装置与光模块连接时，检测装置接收上行光信号检测管脚输出的光信号检测SD信号。
光模块当接收到ONU发送的上行光信号，且未接收到RESET信号时，将SD信号设置为高电平，如果在上行光信号结束后未接收到RESET信号，则保持SD信号为高电平。
即光模块基于RESET信号和上行光信号生成SD信号，至少分为下述几种情况：
第一种情况，光模块在某一时刻同时接收到上行光信号和RESET信号，将SD信号设置为低电平；
第二种情况，光模块在某一时刻仅接收到上行光信号，将SD信号设置为高电平；
第三种情况，光模块在某一时刻仅接收到RESET信号，将SD信号设置为低电平；
第四种情况，光模块在某一时刻未接收到任何信号，将SD信号保持上一时刻的电平状态或者回落到低电平。
步骤404可被替换为：检测装置持续对接收到的第一电平信号和SD信号进行检测，如果在预设时长内接收到的信号中存在低电平信号，则检测装置通知控制装置光模块在位，如果在预设时长内接收到的信号不存在低电平信号，则检测装置通知控制装置光模块不在位。
在一种可能实现的方式中，请参考图6A，其示出了本申请一个实施例应用的电平调节电路的结构示意图，该电平调节电路为上拉电路。该上拉电路包括电流源，电流源电性连接于检测装置的输入端，且电流源还用于连接光模块的上行光信号检测管脚。
在另一种可能实现的方式中，请参考图6B，其示出了本申请另一个实施例应用的电平调节电路的结构示意图，该电平调节电路为上拉电路。该上拉电路包括上拉电阻，上拉电阻的一端连接于电源，另一端连接于检测装置的输入端，且另一端还用于连接光模块的上行光信号检测管脚。
请参考图7，其示出了本申请一个示例性实施例提供的光线路终端的单板的原理示意图。下面结合图6B和图7阐述光模块在位检测方法。需要说明的是，第一时段之前光模块不在位。第一时段与第二时段之间，第二时段与第三时段之间，第三时段与第四时段之间以及第四时段与第五时段之间均相隔一个第一预设周期。以光模块在某一时刻未接收到任何信号，将SD信号保持上一时刻的电平状态为例。
第一时段：
第一阶段，光模块接收到ONU1发送上行光信号的同时接收到控制装置发送的RESET信号。此时，检测装置的输入端接收到光模块发送的低电平的SD信号。
第二阶段，光模块接收到ONU1发送上行光信号，未接收到控制装置发送的RESET信号。此时，检测装置的输入端接收到光模块发送的高电平的SD信号。
第三阶段，光模块未接收到ONU1发送上行光信号和控制装置发送的RESET信号。此 时，光模块持续向倒相器发送上一阶段(即第二阶段)中向检测模块发送的高电平的SD信号，对应的，检测装置的输入端接收到光模块发送的高电平的SD信号。
由于第二预设周期大于第一预设周期，因此检测装置在包含第一时段的第二预设周期内能检测到低电平信号，检测装置则通知控制装置光模块在位(如图7所示，检测装置在第一时段向控制装置发送用于指示光模块在位的高电平信号)。
第二时段：
第一阶段，光模块接收到ONU2发送上行光信号的同时接收到控制装置发送的RESET信号。
第二阶段，光模块接收到ONU2发送上行光信号，未接收到控制装置发送的RESET信号。
第三阶段，光模块未接收到ONU2发送上行光信号和控制装置发送的RESET信号。
需要说明的是，由于第二时段的第一阶段中光模块和检测装置与第一时段的第一阶段中光模块和检测装置的情况类似，第二时段的第二阶段中光模块和检测装置与第一时段的第二阶段中光模块和检测装置的情况类似，第二时段的第三阶段中光模块和检测装置与第一时段的第三阶段中光模块和检测装置的情况类似，因此，本实施例不再对第二时段中光模块和检测装置的情况赘述。
与第一阶段中检测装置则通知控制装置光模块在位同理，检测装置在第二时段向控制装置发送高电平信号。
由于第二预设周期大于第一预设周期，因此检测装置在包含第一时段的第二预设周期内能检测到低电平信号，检测装置则通知控制装置光模块在位(如图7所示，检测装置在第一时段向控制装置发送高电平信号)。
第三时段：
第一阶段，光模块接收到ONU1发送上行光信号的同时接收到控制装置发送的RESET信号。
第二阶段，光模块接收到ONU1发送上行光信号，未接收到控制装置发送的RESET信号。
需要说明的是，由于第三时段的第一阶段中光模块和检测装置与第一时段的第一阶段中光模块和检测装置的情况类似，第三时段的第二阶段中光模块和检测装置与第一时段的第二阶段中光模块和检测装置的情况类似，因此，本实施例不再对第三时段中光模块和检测装置的情况赘述。
与第一阶段中检测装置则通知控制装置光模块在位同理，检测装置在第三时段向控制装置发送高电平信号。
第四时段：
第一阶段，光模块未接收到上行光信号，但接收到控制装置发送的RESET信号。此时，检测装置的输入端接收到光模块发送的低电平的SD信号。
第二阶段，光模块未接收到上行光信号和RESET信号。此时，光模块持续向检测装置发送上一阶段(即第二阶段)中向检测装置发送的低电平的SD信号，对应的，检测装置的输入端接收到光模块发送的低电平信号。
与第一阶段中检测装置则通知控制装置光模块在位同理，检测装置在第四时段向控制 装置发送高电平信号。
第五时段：
第一阶段，光模块与指示信号断开连接(即光模块从OLT拔出)，无法接收到控制装置发送RESET信号。此时，检测装置的输入端接收到电平调节电路发送的高电平信号。
第二阶段，光模块与指示信号断开连接(即光模块从OLT拔出)，控制装置未发送RESET信号。此时，检测装置的输入端接收到电平调节电路发送的高电平信号。
由于第二预设周期大于第一预设周期，因此检测装置在包含第一时段的第二预设周期内未检测到低电平信号时，检测装置则通知控制装置光模块不在位(如图7所示，检测装置在第五时段向控制装置发送低电平的在位信号)。
本申请实施例提供的光线路终端的单板，通过检测装置接收光模块发送的指示信号或电平调节电路发送的第一电平信号，并根据预设规则根据接收到的信号的情况通知控制装置光模块是否在位，由于检测装置实现了光模块的在位管脚的功能，无需在光模块上设置在位管脚，降低光模块对在位管脚的依赖，达到减少光模块的管脚数量的目的。
实施例三
第二种情况，指示信号为LOS信号，电平调节电路为下拉电路，第一电平信号为低电平信号。
步骤403可被替换为：当检测装置与光模块连接时，检测装置接收上行光信号检测管脚输出的光信号丢失LOS信号。
光模块当接收到ONU发送的上行光信号，且未接收到RESET信号时，将LOS信号设置为低电平，如果在上行光信号结束后未接收到RESET信号，则保持LOS信号为低电平。
即光模块基于RESET信号和上行光信号生成LOS信号，至少分为下述几种情况：
第一种情况，光模块在某一时刻同时接收到上行光信号和RESET信号，将LOS信号设置为高电平；
第二种情况，光模块在某一时刻仅接收到上行光信号，将LOS信号设置为低电平；
第三种情况，光模块在某一时刻仅接收到RESET信号，将LOS信号设置为高电平；
第四种情况，光模块在某一时刻未接收到任何信号，将LOS信号保持上一时刻的电平状态或者回升到高电平。
步骤404可被替换为：检测装置持续对接收到的第一电平信号和LOS信号进行检测，如果在预设时长内接收到的信号中存在高电平信号，则检测装置通知控制装置光模块在位，如果在预设时长内接收到的信号不存在高电平信号，则检测装置通知控制装置光模块不在位。
在一种可能实现的方式中，请参考图8，其示出了本申请另一个实施例应用的电平调节电路的结构示意图，该电平调节电路为下拉电路。其中，下拉电路包括下拉电阻，下拉电阻的第一端接地，下拉电阻的第二端电性连接于检测装置的输入端，且下拉电阻的第二端还用于连接光模块的上行光信号检测管脚。
请参考图9，其示出了本申请另一个示例性实施例提供的光线路终端的单板的原理示意图。下面结合图8和图9阐述光模块在位检测方法。需要说明的是，第一时段之前光模块不在位。第一时段与第二时段之间，第二时段与第三时段之间，第三时段与第四时段之间 以及第四时段与第五时段之间均相隔一个第一预设周期。以光模块在某一时刻未接收到任何信号，将LOS信号保持上一时刻的电平状态为例。
第一时段：
第一阶段，光模块接收到ONU1发送上行光信号的同时接收到控制装置发送的RESET信号。此时，检测装置的输入端接收到光模块发送的高电平的LOS信号。
第二阶段，光模块接收到ONU1发送上行光信号，未接收到控制装置发送的RESET信号。此时，检测装置的输入端接收到光模块发送的低电平的LOS信号。
第三阶段，光模块未接收到ONU1发送上行光信号和控制装置发送的RESET信号。此时，光模块持续向检测模块发送上一阶段(即第二阶段)中向检测模块发送的低电平的LOS信号，对应的，检测装置的输入端接收到光模块发送的低电平的LOS信号。
由于第二预设周期大于第一预设周期，因此检测装置在包含第一时段的第二预设周期内能检测到高电平的LOS信号，检测装置则通知控制装置光模块在位(如图9所示，检测装置在第一时段向控制装置发送用于指示光模块在位的高电平信号)。
第二时段：
第一阶段，光模块接收到ONU2发送上行光信号的同时接收到控制装置发送的RESET信号。
第二阶段，光模块接收到ONU2发送上行光信号，未接收到控制装置发送的RESET信号。
第三阶段，光模块未接收到ONU2发送上行光信号和控制装置发送的RESET信号。
需要说明的是，由于第二时段的第一阶段中光模块和检测装置与第一时段的第一阶段中光模块和检测装置的情况类似，第二时段的第二阶段中光模块和检测装置与第一时段的第二阶段中光模块和检测装置的情况类似，第二时段的第三阶段中光模块和检测装置与第一时段的第三阶段中光模块和检测装置的情况类似，因此，本实施例不再对第二时段中光模块和检测装置的情况赘述。
与第一阶段中检测装置则通知控制装置光模块在位同理，检测装置在第二时段向控制装置发送高电平信号。
由于第二预设周期大于第一预设周期，因此检测装置在包含第一时段的第二预设周期内能检测到高电平的LOS信号，检测装置则通知控制装置光模块在位(如图9所示，检测装置在第一时段向控制装置发送高电平信号)。
第三时段：
第一阶段，光模块接收到ONU1发送上行光信号的同时接收到控制装置发送的RESET信号。
第二阶段，光模块接收到ONU1发送上行光信号，未接收到控制装置发送的RESET信号。
需要说明的是，由于第三时段的第一阶段中光模块和检测装置与第一时段的第一阶段中光模块和检测装置的情况类似，第三时段的第二阶段中光模块和检测装置与第一时段的第二阶段中光模块和检测装置的情况类似，因此，本实施例不再对第三时段中光模块和检测装置的情况赘述。
与第一阶段中检测装置则通知控制装置光模块在位同理，检测装置在第三时段向控制 装置发送高电平信号。
第四时段：
第一阶段，光模块未接收到上行光信号，但接收到控制装置发送的RESET信号。此时，检测装置的输入端接收到光模块发送的高电平的LOS信号。
第二阶段，光模块未接收到上行光信号和RESET信号。此时，光模块持续向检测装置发送上一阶段(即第二阶段)中向检测装置发送的高电平的LOS信号，对应的，检测装置的输入端接收到光模块发送的高电平信号。
与第一阶段中检测装置则通知控制装置光模块在位同理，检测装置在第四时段向控制装置发送高电平信号。
第五时段：
第一阶段，光模块与指示信号断开连接(即光模块从OLT拔出)，无法接收到控制装置发送RESET信号。检测装置的输入端接收到电平调节电路发送的低电平信号。
第二阶段，光模块与指示信号断开连接(即光模块从OLT拔出)，控制装置未发送RESET信号。检测装置的输入端接收到电平调节电路发送的低电平信号。
由于第二预设周期大于第一预设周期，因此检测装置在包含第一时段的第二预设周期内未检测到高电平信号时，检测装置则通知控制装置光模块不在位(如图9所示，检测装置在第五时段向控制装置发送用于指示光模块不在为的低电平信号)。
本申请实施例提供的光线路终端的单板，通过检测装置接收光模块发送的指示信号或电平调节电路发送的第一电平信号，并根据预设规则根据接收到的信号的情况通知控制装置光模块是否在位，由于检测装置实现了光模块的在位管脚的功能，无需在光模块上设置在位管脚，降低光模块对在位管脚的依赖，达到减少光模块的管脚数量的目的。
上述本申请实施例序号仅仅为了描述，不代表实施例的优劣。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上所述仅为本申请的可选实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (13)

  1. 一种光线路终端OLT的单板，其特征在于，所述单板包括电平调节电路、检测装置和控制装置，所述电平调节电路电性连接于所述检测装置的输入端，且所述检测装置的输入端和所述电平调节电路还用于连接光模块的上行光信号检测管脚，所述检测装置的输出端与所述控制装置的输入端连接，且所述控制装置的输出端用于连接所述光模块，其中：
    所述控制装置，用于按照第一预设周期向所述光模块发送RESET信号；
    所述电平调节电路，用于当所述检测装置与所述光模块断开连接时，向所述检测装置输出第一电平信号；
    所述检测装置，用于当所述检测装置与所述光模块连接时，接收所述上行光信号检测管脚输出的指示信号；还用于持续对接收到的所述第一电平信号和所述指示信号进行检测，如果在预设时长内接收到的信号中存在与所述第一电平信号相反的第二电平信号，则所述检测装置通知所述控制装置所述光模块在位，如果在所述预设时长内接收到的信号不存在所述第二电平信号，则所述检测装置通知所述控制装置所述光模块不在位，其中，所述预设时长大于所述第一预设周期。
  2. 根据权利要求1所述的单板，其特征在于，所述电平调节电路为上拉电路，所述第一电平信号为高电平信号；
    所述检测装置，用于当所述检测装置与所述光模块连接时，接收所述上行光信号检测管脚输出的光信号检测SD信号；还用于持续对接收到的所述第一电平信号和所述SD信号进行检测，如果在预设时长内接收到的信号中存在低电平信号，则所述检测装置通知所述控制装置所述光模块在位，如果在所述预设时长内接收到的信号不存在低电平信号，则所述检测装置通知所述控制装置所述光模块不在位。
  3. 根据权利要求2所述的单板，其特征在于，所述上拉电路包括电流源，所述电流源电性连接于所述检测装置的输入端，且所述电流源还用于连接光模块的上行光信号检测管脚。
  4. 根据权利要求2所述的单板，其特征在于，所述上拉电路包括上拉电阻，所述上拉电阻的一端连接于电源，另一端连接于所述检测装置的输入端，且所述另一端还用于连接光模块的上行光信号检测管脚。
  5. 根据权利要求1所述的单板，其特征在于，所述电平调节电路为下拉电路，所述第一电平信号为低电平信号；
    所述检测装置，用于当所述检测装置与所述光模块连接时，接收所述上行光信号检测管脚输出的光信号丢失LOS信号；还用于持续对接收到的所述第一电平信号和所述LOS信号进行检测，如果在预设时长内接收到的信号中存在高电平信号，则所述检测装置通知所述控制装置所述光模块在位，如果在所述预设时长内接收到的信号不存在高电平信号，则所述检测装置通知所述控制装置所述光模块不在位。
  6. 根据权利要求5所述的单板，其特征在于，所述下拉电路包括下拉电阻，所述下拉电阻的第一端接地，所述下拉电阻的第二端电性连接于所述检测装置的输入端，且所述下拉电阻的第二端还用于连接光模块的上行光信号检测管脚。
  7. 根据权利要求1所述的单板，其特征在于，所述控制装置为媒体接入控制MAC模块。
  8. 根据权利要求1所述的单板，其特征在于，所述控制装置包括MAC模块和中央处理 器CPU，所述检测装置的输出端与所述CPU的输入端连接，所述CPU的输出端与所述MAC模块的输入端连接，所述MAC模块的输出端用于连接所述光模块，其中：
    所述MAC模块，用于按照第一预设周期向所述光模块发送RESET信号；
    所述检测装置，用于如果在预设时长内接收到的信号中存在与所述第一电平信号相反的第二电平信号，则所述检测装置通知所述CPU所述光模块在位，如果在所述预设时长内接收到的信号不存在所述第二电平信号，则所述检测装置通知所述CPU所述光模块不在位；
    所述CPU，用于当被所述检测装置通知所述光模块在位时，通知所述MAC模块所述光模块在位；当被所述检测装置通知所述光模块不在位时，通知所述MAC模块所述光模块不在位。
  9. 根据权利要求1所述的单板，其特征在于，所述控制装置包括相互连接的MAC模块和CPU，所述检测装置的输出端与所述MAC模块的输入端连接，所述MAC模块的输出端用于连接所述光模块，其中：
    所述检测装置，用于如果在预设时长内接收到的信号中存在与所述第一电平信号相反的第二电平信号，则所述检测装置通知MAC模块所述光模块在位，如果在所述预设时长内接收到的信号不存在所述第二电平信号，则所述检测装置通知MAC模块所述光模块不在位；
    所述MAC模块，用于按照第一预设周期向所述光模块发送RESET信号；以及当被所述检测装置通知所述光模块在位时，通知所述CPU所述光模块在位；当被所述检测装置通知所述光模块不在位时，通知所述CPU所述光模块不在位。
  10. 根据权利要求1所述的单板，其特征在于，所述控制装置包括相互连接的MAC模块和CPU，所述检测装置的输出端分别与所述CPU的输入端和所述MAC模块的输入端连接，所述MAC模块的输出端用于连接所述光模块，其中：
    所述MAC模块，用于按照第一预设周期向所述光模块发送RESET信号；
    所述检测装置，用于如果在预设时长内接收到的信号中存在与所述第一电平信号相反的第二电平信号，则所述检测装置通知所述CPU和所述MAC模块所述光模块在位，如果在所述预设时长内接收到的信号不存在所述第二电平信号，则所述检测装置通知所述CPU和所述MAC模块所述光模块不在位。
  11. 根据权利要求1-10中任一项所述的单板，其特征在于，所述单板还包括所述光模块。
  12. 根据权利要求1-10中任一项所述的单板，其特征在于，所述预设时长为第二预设周期。
  13. 一种光线路终端OLT，其特征在于，所述OLT包括如权利要求1-12中任一项所述的单板。
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