CN118264938A

CN118264938A - PON system, data processing method and related equipment

Info

Publication number: CN118264938A
Application number: CN202211700065.8A
Authority: CN
Inventors: 李良川; 黄远达; 刘耕辰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2024-06-28
Also published as: WO2024140929A1

Abstract

The application provides a PON system, which is applied to the field of optical communication. The PON system includes an optical line terminal and a plurality of optical terminals. The optical line terminal is configured to transmit a first downlink frame to the plurality of optical terminals. The first downlink frame includes a plurality of first data. The plurality of first data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to the target first data of the plurality of first data. The target optical terminal of the plurality of optical terminals is configured to receive the first information from the optical line terminal. The first information includes information of a target time slot corresponding to the target optical terminal. The target optical terminal is used for acquiring target first data in the plurality of first data at the time corresponding to the target time slot according to the first information, and reducing the power consumption of the target optical terminal at the time corresponding to the non-target time slot according to the first information. In the application, the power consumption of the target optical terminal can be reduced at the time corresponding to the non-target time slot through the information of the target time slot carried in the first information.

Description

PON system, data processing method and related equipment

Technical Field

The present application relates to the field of optical communications, and in particular, to a passive optical network (passive optical network, PON) system, a data processing method, and related devices.

Background

The passive optical network (passive optical network, PON) comprises an optical line terminal (optical LINE TERMINAL, OLT), an optical distribution network (optical distribution network, ODN) and an optical network unit (optical network unit, ONU).

In a conventional PON network, all ONUs have to demodulate all data transmitted from an OLT, and acquire data corresponding to themselves from all data. But because the link attenuations of different ONUs are different, the received optical power of different ONUs is different. In order to ensure that all ONUs can correctly receive data, the PON system needs to design a link budget for the ONU with the worst received optical power. But the received optical power of most ONUs is greater than the worst received optical power, resulting in waste of optical power. By performing time-slot processing on the downlink frame sent by the OLT, different ONUs can be made to correspond to different time slots. At this time, each ONU may transmit data in a different quadrature amplitude modulation (quadrature amplitude modulation, QAM) format according to a different received optical power, thereby reducing the waste of optical power.

In practical applications, with the increase of the transmission rate, ONUs still face a larger power consumption pressure.

Disclosure of Invention

The application provides a PON system, a data processing method and related equipment, wherein the power consumption of a target optical terminal can be reduced in the time corresponding to a non-target time slot through the information of the target time slot carried in first information.

The first aspect of the present application provides a PON system. The PON system includes an optical line terminal and a plurality of optical terminals. The optical line terminal is configured to transmit a first downlink frame to the plurality of optical terminals. The first downlink frame includes a plurality of first data. The plurality of first data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to the target first data of the plurality of first data. The target optical terminal of the plurality of optical terminals is configured to receive the first information from the optical line terminal. The first information includes information of a target time slot corresponding to the target optical terminal, such as a start time and an end time of the target time slot. The target optical terminal is used for acquiring target first data in the plurality of first data at the time corresponding to the target time slot according to the first information. The target optical terminal is further configured to reduce power consumption of the target optical terminal at a time corresponding to the non-target time slot according to the first information, for example, to turn off one or more modules of the data recovery module. The time corresponding to the non-target time slot refers to part or all of the time corresponding to the non-target time slot. For convenience of description, in the following description, a time for which the target optical terminal reduces power consumption of the target optical terminal is referred to as a turn-off time. The off time is less than or equal to the total time corresponding to the non-target time slot. The time when the target optical terminal acquires the target first data from among the plurality of first data is referred to as the on time. The open time is greater than or equal to the full time corresponding to the target time slot.

In an alternative form of the first aspect, the target optical terminal is further configured to generate the first clock and the second clock. The target optical terminal is further used for performing analog-to-digital conversion on the plurality of first data according to the first clock to obtain a plurality of digital signals. The plurality of digital signals and the plurality of first data are in one-to-one correspondence. The target optical terminal is used for acquiring target first data in a plurality of digital signals according to the first information and the second clock. The frequency of the first clock is synchronized with the frequency of the second clock. By means of the two clocks with synchronous frequencies, accuracy of time corresponding to the target time slot or time corresponding to the non-target time slot determined by the target optical terminal can be improved. Therefore, the target optical terminal can increase the duration of the off time, thereby further reducing the power consumption of the target optical terminal.

In an alternative form of the first aspect, the first downlink frame further comprises a downlink time slot management channel. The downlink time slot management channel includes first information. By carrying the first information in the downlink time slot management channel, the number of communication times between the optical line terminal and the optical terminal can be reduced, thereby improving the communication efficiency.

In an optional manner of the first aspect, the optical line terminal is further configured to send the second downlink frame to a plurality of optical terminals. The second downlink frame includes a plurality of second data. The plurality of second data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to target second data of the plurality of second data. The target optical terminal is further configured to obtain target second data in the plurality of second data at a time corresponding to the target time slot according to the first information. The target second data includes second information. The second information includes information of the updated target time slot corresponding to the target optical terminal. By carrying updated information of the target time slot in the target second data, the closing time of the target optical terminal can be made to include the time corresponding to the downlink time slot management channel. Therefore, the application can further improve the closing time, thereby reducing the power consumption of the target optical terminal.

In an alternative form of the first aspect, the second information includes a first field and a second field. The content in the first field is used to characterize whether the information of the target time slot is updated. The second field includes information of the updated target slot. When the optical line terminal does not update the target time slot corresponding to the target optical terminal, the second field may be used to carry service data of the target optical terminal. Therefore, the present application can improve communication efficiency.

In an alternative manner of the first aspect, the optical line terminal is configured to send the first downlink frame to the plurality of optical terminals through the first electrical channel. The target optical terminal is configured to receive the first information from the optical line terminal via the second electrical channel. By using different electronic carrier channels, the delay jitter of the data signal can be reduced.

The second aspect of the present application provides a data processing method. The data processing method comprises the following steps: the optical terminal receives a first downlink frame from the optical line terminal. The first downlink frame includes a plurality of first data. The plurality of first data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to the target first data of the plurality of first data. The optical terminal acquires first information. The first information includes information of a target time slot corresponding to the optical terminal. And the optical terminal acquires target first data in the plurality of first data at the time corresponding to the target time slot according to the first information. And the optical terminal reduces the power consumption of the optical terminal at the time corresponding to the non-target time slot according to the first information.

In an alternative form of the second aspect, the data processing method further comprises the steps of: the optical terminal generates a first clock and a second clock. And the optical terminal performs analog-to-digital conversion on the plurality of first data according to the first clock to obtain a plurality of digital signals. The optical terminal acquires target first data from a plurality of digital signals according to the first information and the second clock. Wherein the frequency of the first clock is synchronized with the frequency of the second clock.

In an alternative form of the second aspect, the first downlink frame further comprises a downlink slot management channel. The downlink time slot management channel includes first information.

In an alternative form of the second aspect, the data processing method further comprises the steps of: the optical terminal receives a second downstream frame from the optical line terminal. The second downlink frame includes a plurality of second data. The plurality of second data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to target second data of the plurality of second data. And the optical terminal acquires target second data in the plurality of second data at the time corresponding to the target time slot according to the first information. The target second data includes second information. The second information includes information of the updated target time slot corresponding to the optical terminal.

In an alternative form of the second aspect, the second information includes a first field and a second field. The content in the first field is used to characterize whether the information of the target time slot is updated. The second field includes information of the updated target slot.

In an alternative form of the second aspect, the optical terminal receives the first downlink frame from the optical line terminal via the first electrical channel. The optical terminal receives the first information from the optical line terminal via the second electrical channel.

A third aspect of the application provides a data processing method. The data processing method comprises the following steps: the optical line terminal transmits a first downlink frame to the plurality of optical terminals. The first downlink frame includes a plurality of first data. The plurality of first data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to the target first data of the plurality of first data. The optical line terminal transmits first information to a target optical terminal among the plurality of optical terminals. The first information includes information of a target time slot corresponding to the target optical terminal. The first information is used for the target optical terminal to acquire target first data in the plurality of first data at the time corresponding to the target time slot according to the first information. The first information is also used for reducing the power consumption of the target optical terminal at the time corresponding to the non-target time slot according to the first information.

In an alternative form of the third aspect, the first downlink frame further comprises a downlink time slot management channel. And the optical line terminal sends the first information to the target optical terminal through the downlink time slot management channel.

In an alternative form of the third aspect, the data processing method further comprises the steps of: the optical line terminal transmits a second downlink frame to the plurality of optical terminals. The second downlink frame includes a plurality of second data. The plurality of second data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to target second data of the plurality of second data. The first information is also used for the target optical terminal to acquire target second data in the plurality of second data at the time corresponding to the target time slot according to the first information. The target second data includes second information. The second information includes information of the updated target time slot corresponding to the target optical terminal.

In an alternative form of the third aspect, the second information includes a first field and a second field. The content in the first field is used to characterize whether the information of the target time slot is updated. The second field includes information of the updated target slot.

In an alternative form of the third aspect, the optical line terminal sends the first downlink frame to the plurality of optical terminals through the first electrical channel. The optical line terminal sends the first information to the target optical terminal through the second electrical channel.

A fourth aspect of the present application provides an optical terminal. The optical terminal comprises a receiving module, an acquisition module and a processing module. The receiving module is used for receiving the first downlink frame from the optical line terminal. The first downlink frame includes a plurality of first data. The plurality of first data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to the target first data of the plurality of first data. The acquisition module is used for acquiring the first information. The first information includes information of a target time slot corresponding to the optical terminal. The acquisition module is further used for acquiring target first data in the plurality of first data at the time corresponding to the target time slot according to the first information. The processing module is used for reducing the power consumption of the optical terminal at the time corresponding to the non-target time slot according to the first information.

In an alternative manner of the fourth aspect, the obtaining module is further configured to generate the first clock and the second clock. The acquisition module is also used for carrying out analog-to-digital conversion on the plurality of first data according to the first clock to obtain a plurality of digital signals. The acquisition module is used for acquiring target first data in a plurality of digital signals according to the first information and the second clock. Wherein the frequency of the first clock is synchronized with the frequency of the second clock.

In an alternative form of the fourth aspect, the first downlink frame further comprises a downlink slot management channel. The downlink time slot management channel includes first information.

In an optional manner of the fourth aspect, the receiving module is further configured to receive a second downlink frame from the optical line terminal. The second downlink frame includes a plurality of second data. The plurality of second data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to target second data of the plurality of second data. The acquisition module is further used for acquiring target second data in the plurality of second data at the time corresponding to the target time slot according to the first information. The target second data includes second information. The second information includes information of the updated target time slot corresponding to the optical terminal.

A fifth aspect of the present application provides an optical line terminal. The optical line terminal comprises a processing module and a sending module. The processing module is used for acquiring the first downlink frame and the first information. The sending module is used for sending the first downlink frame to the plurality of optical terminals. The first downlink frame includes a plurality of first data. The plurality of first data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to the target first data of the plurality of first data. The first information includes information of a target time slot corresponding to the target optical terminal. The first information is used for the target optical terminal to acquire target first data in the plurality of first data at the time corresponding to the target time slot according to the first information. The first information is used for reducing the power consumption of the target optical terminal at the time corresponding to the non-target time slot according to the first information.

In an optional manner of the fifth aspect, the sending module is further configured to send the second downlink frame to the plurality of optical terminals. The second downlink frame includes a plurality of second data. The plurality of second data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to target second data of the plurality of second data. The first information is also used for the target optical terminal to acquire target second data in the plurality of second data at the time corresponding to the target time slot according to the first information. The target second data includes second information. The second information includes information of the updated target time slot corresponding to the target optical terminal.

In an alternative form of the fifth aspect, the sending module is configured to send the first downlink frame to the plurality of optical terminals through the first electrical channel. The sending module is also used for sending the first information to the target optical terminal through the second electric channel.

Drawings

Fig. 1 is a schematic structural diagram of a PON system according to an embodiment of the present application;

Fig. 2 is a first schematic structural diagram of a first downlink frame according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of downlink timeslot information according to an embodiment of the present application;

Fig. 4 is a schematic diagram of a first structure of a target optical terminal according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a first structure of a data recovery module according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a second structure of a data recovery module according to an embodiment of the present application;

fig. 7 is a schematic diagram of a second structure of the target optical terminal according to the embodiment of the present application;

Fig. 8 is a schematic diagram of a third configuration of a target optical terminal according to an embodiment of the present application;

fig. 9 is a second schematic structural diagram of a first downlink frame according to an embodiment of the present application;

Fig. 10 is a third schematic structural diagram of a first downlink frame according to an embodiment of the present application;

Fig. 11 is a fourth schematic structural diagram of a first downlink frame according to an embodiment of the present application;

FIG. 12 is a schematic diagram of a structure of target second data according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of second information provided in an embodiment of the present application;

Fig. 14 is a fourth schematic structural diagram of a target optical terminal according to an embodiment of the present application;

fig. 15 is a schematic diagram of a first configuration of an optical line terminal according to an embodiment of the present application;

Fig. 16 is a second schematic structural diagram of an optical line terminal according to an embodiment of the present application;

fig. 17 is a flow chart of a data processing method according to an embodiment of the present application.

Detailed Description

The application provides a PON system, a data processing method and related equipment, wherein the power consumption of a target optical terminal can be reduced in the time corresponding to a non-target time slot through the information of the target time slot carried in first information. It is to be understood that the terms "first," "second," "target," and the like, as used herein, are used solely for the purpose of distinguishing between descriptions and not necessarily for indicating or implying a relative importance or order. In addition, for simplicity and clarity, reference numbers and/or letters are repeated throughout the several figures of the application. Repetition does not indicate a tightly defined relationship between the various embodiments and/or configurations.

In a passive optical network (passive optical network, PON) system, in order to reduce the waste of optical power, a downlink frame sent by an optical line terminal (optical LINE TERMINAL, OLT) may be slotted, so that different optical network terminals (optical network unit, ONU) correspond to different timeslots. At this time, the different ONUs demodulate their respective time slots, and discard the time slots not corresponding thereto. However, in practical applications, with the increase of the transmission rate, the ONU still faces a larger power consumption pressure.

To this end, the present application provides a PON system. Fig. 1 is a schematic structural diagram of a PON system according to an embodiment of the present application. As shown in fig. 1, the PON system includes an OLT 101, an odn 102, and a plurality of optical terminals. In fig. 1, a plurality of optical terminals including optical terminals 104 to 106 are described as an example. The optical terminals 104-106 may be ONUs or optical network terminals (optical network terminal, ONTs), or the like. The ODN 102 includes a splitting/combining device 103. In the upstream direction, upstream optical signals from the respective optical terminals are time-division coupled to the OLT 101 through a combiner 103. In the downstream direction, the OLT 101 distributes downstream optical signals to all optical terminals via the optical splitters 103.

The downstream optical signal may be a first downstream frame. The first downlink frame includes a plurality of first data. The plurality of first data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to the target first data of the plurality of first data. Fig. 2 is a first schematic structural diagram of a first downlink frame according to an embodiment of the present application. As shown in fig. 2, the first downlink frame 201 includes a downlink slot management channel and N slots. N is an integer greater than 1. Each of the N slots is for carrying one first data. Thus, the N slots and the N first data are in one-to-one correspondence. Each of the N slots has its corresponding start time and end time. For example, in fig. 2, the start time of slot 1 is 11 and the end time is 200. The start time of slot 2 is 201 and the end time is 400. It should be understood that embodiments of the present application are not limited to units of start time and end time. In fig. 2, the start time and the end time are relative times. The relative time is calculated based on the start time of the first downlink frame. In practical applications, the start time and the end time may be standard times. For example, the start time is set to 14 hours, 10 minutes and 30 seconds on a day. In practical applications, the plurality of optical terminals may be all receivers of the downlink timeslot management channel. The N time slots have respective receivers. Therefore, for convenience of description, a time corresponding to the downlink slot management channel is referred to as a common time. The time corresponding to the plurality of time slots is referred to as a private time.

The target optical terminal of the plurality of optical terminals is configured to receive the first information from the optical line terminal. The target optical terminal is any one of a plurality of optical terminals. The first information includes information of a target time slot corresponding to the target optical terminal, such as a start time and an end time of the target time slot. The target time slot is one of a plurality of time slots. The target optical terminal is a receiver of target first data carried in the target time slot. The target optical terminal is used for acquiring target first data in the plurality of first data at the time corresponding to the target time slot according to the first information. The target optical terminal is further configured to reduce power consumption of the target optical terminal at a time corresponding to the non-target time slot according to the first information, for example, to turn off one or more modules of the data recovery module.

In the embodiment of the present application, the first information includes information of a target time slot. The target optical terminal can reduce the power consumption of the target optical terminal at the time corresponding to the non-target time slot through the first information. The time corresponding to the non-target time slot may be a time in which the target time slot is not included in the private time. For example, the target slot is slot 1 in fig. 2. At this time, the start time of the target slot is 11 and the end time is 200. The target optical terminal may reduce power consumption of the target optical terminal between 201 and 9720.

It should be appreciated that the target optical terminal may reduce power consumption of the target optical terminal for some or all of the time corresponding to the non-target time slot. For convenience of description, in the following description, a time for which the target optical terminal reduces power consumption of the target optical terminal is referred to as a turn-off time. The off time is less than or equal to the total time corresponding to the non-target time slot. The time when the target optical terminal acquires the target first data from among the plurality of first data is referred to as the on time. The open time is greater than or equal to the full time corresponding to the target time slot.

It should be understood that the target optical terminal is any one of a plurality of optical terminals. Other optical terminals may also perform similar steps as the target optical terminal, thereby reducing the power consumption of the other optical terminals. In the present application, a target optical terminal among a plurality of optical terminals will be described later as an example.

In practical applications, the electrical channels are also referred to as electronic carrier channels. The optical line terminal may transmit the first information and the first downlink frame through the same electrical channel, or may transmit the first information and the first downlink frame through different electrical channels. For example, an optical line terminal is used to transmit a downlink frame to a plurality of optical terminals. The downlink frame includes a first downlink frame and first information. Over the electrical spectrum, the first downlink frame is on a first electrical channel and the first information is on a second electrical channel. When the optical line terminal transmits the first information and the first downlink frame through the same electric channel, the optical line terminal transmits the first information and the first downlink frame to a plurality of optical terminals in a time-sharing mode.

Fig. 3 is a schematic structural diagram of downlink timeslot information according to an embodiment of the present application. As shown in fig. 3, the downlink time slot information 301 carries N pieces of information. Each of the N pieces of information includes a code, a start time, and an end time. Encoded as an identification of the optical terminal. For example, the identification of the target optical terminal is 1. At this time, the target optical terminal searches the downlink timeslot management channel 301, and obtains a start time of 11 and an end time of 200 corresponding to the target timeslot. The N pieces of information may correspond to the N terminals one by one. Therefore, other optical terminals can acquire the information of the corresponding time slot according to the downlink time slot management channel.

The downstream time slot management channel may also be referred to as a common management channel or downstream bandwidth management channel, etc. In addition to the downstream slot information described in fig. 3, the downstream slot management channel may also carry information such as upstream transmission time, format modulation, or forward error correction code (forward error correction, FEC) format. This will be described separately below.

As can be seen from the foregoing description of fig. 1, in the upstream direction, the upstream optical signals from the respective optical terminals are time-shared and coupled to the OLT 101 through the combiner 103. Therefore, in order to avoid interference of optical signals between the plurality of optical terminals, the optical line terminal needs to allocate uplink transmission time to the plurality of optical terminals. The downlink time slot management channel may include information about the uplink transmission time.

In practical applications, the link attenuation of different optical terminals is different, so that the received optical power of different optical terminals is different. To reduce the waste of optical power, each optical terminal may transmit data in a different quadrature amplitude modulation (quadrature amplitude modulation, QAM) format according to a different optical power. At this time, the optical terminal needs to acquire information of a modulation format to correctly demodulate the data. The downstream time slot management channel may include information related to the format modulation.

In practical applications, the size of each time slot may be different. At this time, the plurality of first data may include FEC error correction codes of different formats. After the optical terminal receives the corresponding first data, the optical terminal can perform FEC decoding on the first data according to the FEC error correction code of the corresponding format. Thus, the downstream slot management channel may include information regarding the FEC format.

It should be appreciated that the foregoing is merely exemplary of the functionality of the downstream slot management channel. In practical applications, the downlink timeslot management channel may be one or more timeslots of the first downlink frame. The optical line terminal can help the optical terminal enter an uplink bandwidth authorization stage after power-on startup through the downlink time slot management channel. After the authorization, the optical line terminal sends the downlink time slot information to a plurality of optical terminals through the downlink time slot management channel.

In the embodiment of the application, the target optical terminal is used for acquiring the target first data corresponding to the target time slot at the time corresponding to the target time slot. The target optical terminal is further configured to reduce power consumption of the target optical terminal at a time corresponding to the non-target time slot. The process of acquiring the target first data and reducing the power consumption of the target optical terminal will be exemplarily described with reference to a schematic structural diagram of the target optical terminal.

Fig. 4 is a schematic diagram of a first structure of a target optical terminal according to an embodiment of the present application. As shown in fig. 4, the target optical terminal 401 includes a receiving port 402, an optical demodulator 403, a digital-to-analog converter 404, a data recovery module 405, a Timing Recovery (TR) module 406, a clock generator 407, and a processor 408. The processor 408 may be a central processor (central processing unit, CPU), a network processor (network processor, NP) or a combination of CPU and NP. The processor 408 may further comprise a hardware chip or other general purpose processor. The hardware chip may be an Application SPECIFIC INTEGRATED Circuit (ASIC), a programmable logic device (programmable logic device, PLD), or a combination thereof. The receiving port 402 is a fiber optic port. The functions of the respective modules in the target optical terminal 401 will be described below taking the first downlink frame in fig. 2 as an example.

The first downlink frame is a continuous data stream. The target optical terminal 401 is at the on time from time 0to time 11. The receiving port 402 is used to connect optical fibers. The optical demodulator 403 is configured to receive a downstream optical signal corresponding to the downstream timeslot management channel from the receiving port 402, and demodulate the downstream optical signal into a downstream analog electrical signal. The clock generator 407 is configured to generate a first clock and a second clock. The first clock may also be referred to as a sampling clock. The digital-to-analog converter 404 is configured to receive the first clock from the clock generator 407 and receive the downstream analog electrical signal from the optical demodulator 403. The digital-to-analog converter 404 is further configured to convert the downstream analog electrical signal into a downstream digital electrical signal according to the first clock. The TR module 406 is configured to calculate a phase error between the sampling clock and a random clock of the downstream analog electrical signal, and send the phase error to the clock generator 407. The clock generator 407 is also used to adjust the frequency and phase of the first clock according to the phase error. The data recovery module 405 is configured to receive the downlink digital electrical signal from the digital-to-analog converter 404, and perform processes such as equalization, sequence detection, and FEC decoding on the downlink digital electrical signal. The processor 408 is configured to receive the processed digital electrical signal from the data recovery module 405. The processed digital electrical signal may include first information. Thus, the processor 408 is configured to obtain the first information. The first information includes information of a target time slot corresponding to the target optical terminal. The following description will take the time slot 2 as the target time slot as an example. It should be appreciated that the processor 408 may obtain the first information through other wavelength channels or at other times even if the processed digital electrical signal does not include the first information.

The processor 408 is further configured to receive a second clock from the clock transmitter 407, and time the data stream of the first downlink frame according to the second clock. The second clock is synchronized with the first clock, i.e. the frequency of the first clock and the frequency of the second clock are integer multiples. The frequency of the first clock and the frequency of the second clock may be the same. From the foregoing description, it is possible that the clock generator 407 may also be configured to adjust the frequency and phase of the first clock according to the phase error. When the frequency and phase of the first clock are adjusted, the frequency and phase of the second clock are adjusted synchronously. The adjusted second clock and the adjusted first clock remain synchronized. By clocking with the second clock, the processor 408 can obtain a relative time with respect to the start time of the first downlink frame.

From the foregoing description, the processor 408 obtains the start time of the target time slot of 201 and the end time of 400 from time 0 to time 11. Thus, the target optical terminal 401 may be at the off time from the time 11 to the time 200. The processor 408 cannot normally acquire the data carried in the downstream optical signal at the off time. For example, the processor 408 may transmit a shutdown control signal to the data recovery module 405. The data recovery module 405 turns off one or more of the modules during time 11 to 200 according to the turn-off control signal. The structure of the data recovery module 405 is exemplarily described below.

Fig. 5 is a schematic diagram of a first structure of a data recovery module according to an embodiment of the present application. As shown in fig. 5, the data recovery modules include a feed-forward equalizer (FFE) module 501, a maximum likelihood estimation equalizer (maximum likelihood sequence estimation equalizer, MLSE) module, a demapping module 503, and an FEC module 504.FFE module 501 and MLSE module 502 are used to compensate for the intersymbol interference of the channel. The demapping module 503 is configured to demap the modulation symbols into a bit stream. FEC module 504 is used for FEC decoding.

Fig. 6 is a second schematic structural diagram of a data recovery module according to an embodiment of the present application. As shown in fig. 6, the data recovery modules include an FFE module 501, a frequency-domain equalizer (FEQ) module 601, a demapping module 503, and an FEC module 504. The FEQ module 601 is used to compensate for channel amplitude, phase impairments, intersymbol interference or inter-channel interference. The function of the other modules is similar to that described in fig. 5 above.

It should be understood that turning off one or more of the modules may refer to turning off power to one or more of the modules, forcing an input of one or more of the modules to 0, or turning off an input clock to one or more of the modules, etc. For example, data recovery module 405 turns off power to FFE module 501 according to the off control signal.

The target optical terminal 401 is at the on time from time 201 to 400. The processor 408 normally acquires data carried in the downstream optical signal at the on time. The target optical terminal 401 receives the target first data carried in the time slot 2 according to the manner of receiving the downlink time slot management channel. For example, the processor 408 may transmit an open control signal to the data recovery module 405. The data recovery module 405 turns on the module that is turned off at the aforementioned time 11 to 200 according to the turn-on control signal.

The target optical terminal 401 may be at the off time from time 401 to time 9720.

In the foregoing example, in the private time, the off time is equal to the total time corresponding to the non-target time slot, and the on time is equal to the total time corresponding to the target time slot. In practical applications, the off time may be less than the total time corresponding to the non-target time slot. The on time may be greater than the total time corresponding to the target time slot. For example, in the aforementioned private time, the closing time is 401 to 9720. The opening time is 11 to 400.

Fig. 7 is a schematic diagram of a second structure of the target optical terminal according to the embodiment of the present application. As shown in fig. 7, the target optical terminal 401 further includes a timing trigger 701 on the basis of fig. 4. The timing trigger 701 is used to perform operations regarding timing and control performed by the aforementioned processor 408. Specifically, the timing flip-flop 701 is used to receive the second clock from the clock transmitter 407. The timing trigger 701 may also be used to obtain the start time of the first downlink frame from the processor 408 or the data recovery module 405. The timing trigger 701 is configured to clock the data stream of the first downlink frame according to the second clock and the start time of the first downlink frame. The timing trigger 701 is also used to obtain the first information from the processor 408. The timing trigger 701 is used to transmit a shutdown control signal to the data recovery module 405 when the target optical terminal 401 needs to be in a shutdown state. The timing trigger 701 is used to transmit an open control signal to the data recovery module 405 when the target optical terminal 401 needs to be in an open state.

In the foregoing examples of fig. 4 and 7, the first information is relative time. To improve timing accuracy, the processor 408 or the timing trigger 701 clocks the data stream of the first downlink frame according to the second clock. The second clock is synchronized with the clock. As can be seen from the description of fig. 1, the first information may also be a common time. At this point, the processor 408 may clock the first downlink frame alone. Fig. 8 is a schematic diagram of a third configuration of the target optical terminal according to the embodiment of the present application. As shown in fig. 8, based on fig. 4, the processor 408 clocks the data stream of the first downstream frame according to itself or another clock generator. At this point, the processor 408 need not receive the second clock from the clock transmitter 407.

In practical applications, when the first information is a common time, in order to further reduce the power consumption of the target optical terminal 401, the processor 408 may switch off one or more of the data recovery module 405, the optical demodulator 403, the digital-to-analog converter 404, or the TR module 406 at the off time. For example, the processor 408 turns off the power to the digital to analog converter 404 at the off time. As another example, processor 408 turns off FFE module 501 of digital-to-analog converter 404 at a turn-off time.

In other embodiments, the target optical terminal 401 may also include memory. The memory is used for storing target first data or first information. The memory may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an erasable programmable ROM (erasable PROM, EPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM).

In the foregoing example, the target optical terminal 401 must be at the on time at the common time in order to receive the common message. In practical applications, in order to further improve the closing duration, the optical line terminal may carry the time slot update information of the target optical terminal 401 in the data corresponding to the target time slot. Specifically, the target optical terminal 401 is further configured to acquire, according to the first information, target second data in the plurality of second data at a time corresponding to the target time slot. The target second data includes second information. The second information includes information of the updated target time slot corresponding to the target optical terminal. At this time, the off time of the target optical terminal 401 may include a common time, thereby further increasing the off time period. This will be described in detail below.

After the first downlink frame is sent, the optical line terminal is further configured to send a second downlink frame to the plurality of optical terminals. It should be appreciated that the second downstream frame need not be the first downstream frame after the first downstream frame. The second downlink frame includes a plurality of second data. The plurality of second data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to target second data of the plurality of second data. Depending on the format of the second downstream frame, the off-time and on-time of the target optical terminal may be different.

When the format of the second downlink frame is shown in fig. 2, it is assumed that the target slot is still slot 2. At this time, the target optical terminal may acquire the target second data according to the aforementioned manner of acquiring the target first data. The turn-off time and turn-on time of the target optical terminal may be referred to the previous related description.

Fig. 9 is a second schematic structural diagram of a first downlink frame according to an embodiment of the present application. As shown in fig. 9, the first downlink frame further includes a first region on the basis of fig. 2. The space corresponding to the first region in the first downlink frame is used for transmitting downlink time slot information. In the embodiment of the application, the downlink time slot information is carried in the private time slot. Therefore, the size of the downlink slot management channel of the second downlink frame may be smaller than the size of the downlink slot management channel of the second downlink frame. In practical applications, the first area may be allocated to any terminal of the plurality of terminals or other terminals by an optical line terminal in any manner. Therefore, when the first region is allocated to an optical terminal other than the target optical terminal, the off time of the target optical terminal may further include a time corresponding to the downstream slot management channel and/or the first region. When the first region is allocated to the target optical terminal, the on-time of the target optical terminal further includes a time corresponding to the first region. The closing time of the target optical terminal may further include a time corresponding to the downlink timeslot management channel.

In practical applications, when the first area is allocated to the target optical terminal, in order to make the time slots corresponding to the target optical terminal continuous, the optical line terminal may adjust the downlink time slot information in any manner. For example, fig. 10 is a third schematic structural diagram of a first downlink frame according to an embodiment of the present application. As shown in fig. 10, the first area is incorporated into the slot 2 by adjusting the position of the first area on the basis of fig. 9. In fig. 9, the size of slot 2 is 200. In fig. 10, the size of slot 2 is 202.

In practical applications, in order to reduce the overhead of adjusting downlink timeslot information, the first area may be allocated to an optical terminal corresponding to a timeslot adjacent to the first area. For example, in fig. 9, the first region is connected to slot 1. Time slot 1 is allocated to optical terminal 1. Thus, the first area may be allocated to the optical terminal 1. At this time, among the allocation information of N slots, only the slot allocation information of the optical terminal 1 needs to be modified, thereby reducing the overhead of adjusting the downlink slot information.

As can be seen from the foregoing description, the optical line terminal may carry the time slot update information subsequent to the target optical terminal 401 in the data corresponding to the target time slot. Similarly, the optical line terminal may also carry information such as the subsequent uplink transmission time, format modulation, FEC format, etc. of the target optical terminal 401 in the data corresponding to the target time slot. Fig. 11 is a fourth schematic structural diagram of a first downlink frame according to an embodiment of the present application. As shown in fig. 11, the first downlink frame further includes a first region on the basis of fig. 2. The size of the first region is equal to the size of the downlink slot management channel. The first region may be allocated to any terminal of the plurality of terminals or other terminals by an optical line terminal in any manner. Accordingly, when the first region is allocated to an optical terminal other than the target optical terminal, the off-time of the target optical terminal may further include a time corresponding to the first region. When the first region is allocated to the target optical terminal, the on-time of the target optical terminal further includes a time corresponding to the first region.

As can be seen from the foregoing description, the target second data in the target slot includes second information. The target second data will be described below taking the time slot 2 in fig. 9 as an example of the target time slot. Fig. 12 is a schematic structural diagram of target second data according to an embodiment of the present application. As shown in fig. 12, the target second data corresponding to the slot 901 includes an overhead segment and a data segment. The data segment is used for transmitting service data. The overhead segment is used for transmitting overhead, such as second information, uplink transmission time, format modulation, or FEC format, etc. Fig. 13 is a schematic structural diagram of second information according to an embodiment of the present application. As shown in fig. 13, the second information 1301 includes a first field and a second field. The content in the first field is used to characterize whether the information of the target time slot is updated. For example, when the content of the first field is 1, the second field includes information indicating the updated target slot. When the content of the first field is 0, the second information does not include the second field. At this time, a space corresponding to the second field may be allocated to the data segment.

It should be appreciated that in the foregoing example, N time slots are in one-to-one correspondence with N optical terminals. One slot is allocated to one optical terminal. In practical applications, one time slot may correspond to a plurality of optical terminals of the N optical terminals. For example, when a target time slot is allocated to a plurality of optical terminals, the plurality of optical terminals may acquire target first data in a first downlink frame at a time corresponding to the target time slot.

Fig. 14 is a fourth schematic structural diagram of a target optical terminal according to an embodiment of the present application. As shown in fig. 14, the target optical terminal includes a receiving module 1402, an acquiring module 1403, and a processing module 1404. The receiving module 1402 is configured to receive a first downlink frame from an optical line terminal. The first downlink frame includes a plurality of first data. The plurality of first data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to the target first data of the plurality of first data. The acquisition module 1403 is used to acquire the first information. The first information includes information of a target time slot corresponding to the target optical terminal. The obtaining module 1403 is further configured to obtain target first data in the plurality of first data at a time corresponding to the target time slot according to the first information. The processing module 1404 is configured to reduce power consumption of the optical terminal at a time corresponding to the non-target time slot according to the first information.

It should be appreciated that the structure of the target optical terminal 1401 in fig. 14 is similar to the structure of the target optical terminal 401 in fig. 4, 7 or 8 described above. Accordingly, as for the structural description of the target optical terminal 1401, reference may be made to the foregoing structural description of the target optical terminal 401. For example, the receiving module 1402 includes a receiving port 402. The acquisition module 1403 includes an optical demodulator 403, a digital to analog converter 404, a data recovery module 405, a TR module 406, a clock generator 407, and a processor 408. The processing module 1404 includes a processor 408 and/or a timing trigger 701.

It should be appreciated that there are similarities to the foregoing description of the functionality of the target optical terminal 1401 with respect to the functionality of the target optical terminal 401 in fig. 4, 7 or 8. Accordingly, regarding the description of the function of the target optical terminal 1401, reference may be made to the description of the function of the target optical terminal 401 described previously. For example, the receiving module 1402 is further configured to receive a second downlink frame from the optical line terminal. The second downlink frame includes a plurality of second data. The plurality of second data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to target second data of the plurality of second data. The obtaining module 1403 is further configured to obtain, according to the first information, the target second data in the plurality of second data at a time corresponding to the target time slot.

Fig. 15 is a schematic diagram of a first configuration of an optical line terminal according to an embodiment of the present application. As shown in fig. 15, the optical line terminal 1501 includes a processing module 1502 and a transmitting module 1503. The processing module 1502 is configured to obtain a first downlink frame and first information. The transmitting module 1503 is configured to transmit the first downlink frame to a plurality of optical terminals. The first downlink frame includes a plurality of first data. The plurality of first data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to the target first data of the plurality of first data. The first information includes information of a target time slot corresponding to the target optical terminal. The first information is used for the target optical terminal to acquire target first data in the plurality of first data at the time corresponding to the target time slot according to the first information. The first information is used for reducing the power consumption of the target optical terminal at the time corresponding to the non-target time slot according to the first information.

It should be appreciated that the description of the optical line terminal 1501 in fig. 15 is similar to the description of the PON system or the target optical terminal 401 described above. Accordingly, the description regarding the optical line terminal 1501 may refer to the description in any one of the foregoing fig. 1 to 13. The transmitting module 1503 is further configured to transmit the second downlink frame to the plurality of optical terminals, for example. The second downlink frame includes a plurality of second data. As another example, the transmitting module 1503 is configured to transmit a first downlink frame to a plurality of optical terminals through a first electrical channel. The transmitting module 1503 is configured to transmit the first information to the target optical terminal through the second electrical channel. As another example, the first downlink frame includes first information.

Fig. 16 is a second schematic structural diagram of an optical line terminal according to an embodiment of the present application. As shown in fig. 16, the optical line terminal 1601 includes a processor 1602 and a transceiver 1603. The transceiver 1603 is an optical transceiver module. For a description of processor 1602, reference may be made to the description of processor 408 in FIG. 4, previously described. The processor 1602 is configured to obtain a first downlink frame and first information. The transceiver 1603 is for transmitting a first downlink frame to a plurality of optical terminals. The first downlink frame includes a plurality of first data. The plurality of first data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to the target first data of the plurality of first data. The first information includes information of a target time slot corresponding to the target optical terminal. The first information is used for the target optical terminal to acquire target first data in the plurality of first data at the time corresponding to the target time slot according to the first information. The first information is used for reducing the power consumption of the target optical terminal at the time corresponding to the non-target time slot according to the first information.

It should be understood that the description of the optical line terminal 1601 in fig. 16 is similar to the description of the PON system or the target optical terminal 401 described above. Accordingly, the description regarding the optical line terminal 1601 may refer to the description in any of the foregoing fig. 1 to 13. For example, the transceiver 1603 is also configured to transmit a second downstream frame to the plurality of optical terminals. The second downlink frame includes a plurality of second data. In other embodiments, the optical line terminal 1601 may also include a memory 1604. With respect to the description of the memory, reference may be made to the description of the memory in fig. 4 previously described. The memory may be used to store the first information.

Fig. 17 is a flow chart of a data processing method according to an embodiment of the present application. As shown in fig. 17, the data processing method includes the following steps.

In step 1701, the optical line terminal transmits a first downlink frame and first information to the target optical terminal. The first downlink frame includes a plurality of first data. The plurality of first data corresponds to the plurality of time slots one by one. The target time slot of the plurality of time slots corresponds to the target first data of the plurality of first data. The first information includes information of a target time slot corresponding to the target optical terminal. The first downlink frame may include first information.

In step 1702, the target optical terminal obtains target first data in the plurality of first data at a time corresponding to the target time slot according to the first information, and reduces power consumption of the optical terminal at a time corresponding to the non-target time slot according to the first information. It should be understood that there are similarities to the description of the PON system or the target optical terminal 401 described above with respect to the data processing method. Accordingly, the description of the data processing method may refer to the description in any of the foregoing fig. 1 to 13. For example, an optical line terminal transmits a first downlink frame to a plurality of optical terminals through an ODN. The plurality of optical terminals includes a target optical terminal. As another example, the targeted optical terminal turns off the power to FFE module 501 at times corresponding to non-targeted time slots.

The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered.

Claims

1. A passive optical network PON system, comprising an optical line terminal and a plurality of optical terminals, wherein:

the optical line terminal is configured to send a first downlink frame to the plurality of optical terminals, where the first downlink frame includes a plurality of first data, the plurality of first data corresponds to a plurality of time slots one by one, and a target time slot in the plurality of time slots corresponds to a target first data in the plurality of first data;

the target optical terminal in the plurality of optical terminals is configured to receive first information from the optical line terminal, where the first information includes information of the target time slot corresponding to the target optical terminal;

the target optical terminal is configured to obtain, according to the first information, the target first data in the plurality of first data at a time corresponding to the target time slot, and reduce, according to the first information, power consumption of the target optical terminal at a time not corresponding to the target time slot.

2. The PON system according to claim 1, wherein,

The target optical terminal is further used for generating a first clock and a second clock, performing analog-to-digital conversion on the plurality of first data according to the first clock to obtain a plurality of digital signals, wherein the plurality of digital signals are in one-to-one correspondence with the plurality of first data;

The target optical terminal being configured to obtain, according to the first information, the target first data in the plurality of first data at a time corresponding to the target time slot includes: the target optical terminal is used for acquiring the target first data from the plurality of digital signals according to the first information and the second clock;

Wherein the frequency of the first clock is synchronized with the frequency of the second clock.

3. The PON system according to claim 1 or 2, wherein the first downlink frame further comprises a downlink time slot management channel comprising the first information.

4. The PON system of claim 3, wherein,

The optical line terminal is further configured to send a second downlink frame to the plurality of optical terminals, where the second downlink frame includes a plurality of second data, the plurality of second data corresponds to the plurality of time slots one to one, and the target time slot in the plurality of time slots corresponds to a target second data in the plurality of second data;

The target optical terminal is further configured to obtain, according to the first information, the target second data in the plurality of second data at a time corresponding to the target time slot, where the target second data includes second information, and the second information includes updated information of the target time slot corresponding to the target optical terminal.

5. The PON system according to claim 4, wherein the second information comprises a first field and a second field, wherein contents in the first field are used to characterize whether to update the information of the target slot, and wherein the second field comprises the updated information of the target slot.

6. The PON system according to any one of claims 1 to 5, wherein,

The optical line terminal for sending a first downlink frame to the plurality of optical terminals includes: the optical line terminal is used for sending the first downlink frame to the plurality of optical terminals through a first electrical channel;

The target optical terminal being configured to receive first information from the optical line terminal, including: the target optical terminal is configured to receive the first information from the optical line terminal through a second electrical channel.

7. A method of data processing, comprising:

the optical terminal receives a first downlink frame from the optical line terminal, wherein the first downlink frame comprises a plurality of first data, the plurality of first data are in one-to-one correspondence with a plurality of time slots, and a target time slot in the plurality of time slots corresponds to a target first data in the plurality of first data;

The optical terminal acquires first information, wherein the first information comprises information of the target time slot corresponding to the optical terminal;

the optical terminal obtains the target first data in the plurality of first data at the time corresponding to the target time slot according to the first information, and reduces the power consumption of the optical terminal at the time not corresponding to the target time slot according to the first information.

8. The data processing method of claim 7, wherein the method further comprises:

The optical terminal generates a first clock and a second clock;

The optical terminal carries out analog-to-digital conversion on the plurality of first data according to the first clock to obtain a plurality of digital signals;

the optical terminal obtaining the target first data in the plurality of first data at the time corresponding to the target time slot according to the first information includes: the optical terminal acquires the target first data from the plurality of digital signals according to the first information and the second clock;

9. The data processing method according to claim 7 or 8, wherein the first downlink frame further includes a downlink slot management channel, the downlink slot management channel including the first information;

The method further comprises the steps of:

The optical terminal receives a second downlink frame from the optical line terminal, wherein the second downlink frame comprises a plurality of second data, the second data correspond to the time slots one by one, and the target time slot in the time slots corresponds to target second data in the second data;

The optical terminal obtains the target second data in the plurality of second data according to the first information at the time corresponding to the target time slot, wherein the target second data comprises second information, and the second information comprises updated information of the target time slot corresponding to the optical terminal.

10. A data processing method according to any one of claims 7 to 9, wherein,

The optical terminal receiving a first downlink frame from an optical line terminal includes: the optical terminal receives the first downlink frame from the optical line terminal through a first electrical channel;

The optical terminal obtaining the first information includes: the optical terminal receives the first information from the optical line terminal through a second electrical channel.

11. A method of data processing, comprising:

the optical line terminal sends a first downlink frame to a plurality of optical terminals, wherein the first downlink frame comprises a plurality of first data, the plurality of first data are in one-to-one correspondence with a plurality of time slots, and a target time slot in the plurality of time slots corresponds to target first data in the plurality of first data;

The optical line terminal sends first information to a target optical terminal in the plurality of optical terminals, wherein the first information comprises information of a target time slot corresponding to the target optical terminal, the first information is used for the target optical terminal to acquire the target first data in the plurality of first data according to the first information at the time corresponding to the target time slot, and the first information is also used for the target optical terminal to reduce the power consumption of the target optical terminal according to the first information at the time not corresponding to the target time slot.

12. The data processing method of claim 11, wherein the first downlink frame further comprises a downlink time slot management channel;

The optical line terminal sending first information to a target optical terminal of the plurality of optical terminals includes: and the optical line terminal sends first information to the target optical terminal through the downlink time slot management channel.

13. The data processing method of claim 12, wherein the method further comprises:

The optical line terminal sends a second downlink frame to the plurality of optical terminals, the second downlink frame comprises a plurality of second data, the plurality of second data and the plurality of time slots are in one-to-one correspondence, the target time slot in the plurality of time slots corresponds to target second data in the plurality of second data, the first information is further used for the target optical terminal to acquire the target second data in the plurality of second data according to the first information at the time corresponding to the target time slot, the target second data comprises second information, and the second information comprises updated information of the target time slot corresponding to the target optical terminal.

14. The data processing method of claim 13, wherein the second information includes a first field and a second field, the contents of the first field being used to characterize whether to update the information of the target time slot, and the second field including the updated information of the target time slot.

15. A data processing method according to any one of claims 11 to 14, wherein,

The optical line terminal sending a first downlink frame to a plurality of optical terminals includes: the optical line terminal sends the first downlink frame to the plurality of optical terminals through a first electrical channel;

the optical line terminal sending first information to a target optical terminal of the plurality of optical terminals includes: and the optical line terminal sends the first information to the target optical terminal through a second electric channel.

16. The optical terminal is characterized by comprising a receiving module, an acquisition module and a processing module, wherein:

The receiving module is configured to receive a first downlink frame from an optical line terminal, where the first downlink frame includes a plurality of first data, the plurality of first data corresponds to a plurality of time slots one by one, and a target time slot in the plurality of time slots corresponds to a target first data in the plurality of first data;

The acquisition module is used for acquiring first information, wherein the first information comprises information of the target time slot corresponding to the optical terminal;

the acquisition module is further configured to acquire the target first data in the plurality of first data at a time corresponding to the target time slot according to the first information;

The processing module is used for reducing the power consumption of the optical terminal at the time corresponding to the non-target time slot according to the first information.

17. The optical terminal of claim 16, wherein the optical terminal comprises,

The acquisition module is also used for generating a first clock and a second clock;

The acquisition module is further used for performing analog-to-digital conversion on the plurality of first data according to the first clock to obtain a plurality of digital signals;

The obtaining module is configured to obtain, according to the first information, the target first data in the plurality of first data at a time corresponding to the target time slot, where the obtaining includes: the acquisition module is used for acquiring the target first data from the digital signals according to the first information and the second clock;

18. The optical terminal according to claim 16 or 17, wherein the first downlink frame further comprises a downlink time slot management channel, the downlink time slot management channel comprising the first information;

The receiving module is further configured to receive a second downlink frame from the optical line terminal, where the second downlink frame includes a plurality of second data, the plurality of second data corresponds to the plurality of time slots one to one, and the target time slot in the plurality of time slots corresponds to a target second data in the plurality of second data;

The acquisition module is further configured to acquire, according to the first information, the target second data in the plurality of second data at a time corresponding to the target time slot, where the target second data includes second information, and the second information includes updated information of the target time slot corresponding to the optical terminal.

19. The optical line terminal is characterized by comprising a processing module and a sending module:

the processing module is used for acquiring a first downlink frame and first information;

the sending module is used for sending a first downlink frame to a plurality of optical terminals, the first downlink frame comprises a plurality of first data, the plurality of first data and a plurality of time slots are in one-to-one correspondence, and a target time slot in the plurality of time slots corresponds to target first data in the plurality of first data;

the first information includes information of the target time slot corresponding to the target optical terminal, the first information is used for the target optical terminal to acquire the target first data in the plurality of first data at a time corresponding to the target time slot according to the first information, and the first information is also used for the target optical terminal to reduce power consumption of the target optical terminal at a time not corresponding to the target time slot according to the first information.

20. The optical line terminal of claim 19, wherein,

The sending module is further configured to send a second downlink frame to the plurality of optical terminals, where the second downlink frame includes a plurality of second data, the plurality of second data corresponds to the plurality of time slots one to one, the target time slot in the plurality of time slots corresponds to a target second data in the plurality of second data, and the first information is further used for the target optical terminal to obtain, according to the first information, the target second data in the plurality of second data at a time corresponding to the target time slot, where the target second data includes second information, and the second information includes updated information of the target time slot corresponding to the target optical terminal.

21. An optical line terminal according to claim 19 or 20, characterized in that,

The sending module is configured to send a first downlink frame to a plurality of optical terminals, including: the sending module is used for sending the first downlink frame to the plurality of optical terminals through a first electric channel;

the sending module is further configured to send the first information to the target optical terminal through a second electrical channel.