WO2011151922A1 - 受信装置、データ識別再生装置、ponシステムおよびデータ識別再生方法 - Google Patents
受信装置、データ識別再生装置、ponシステムおよびデータ識別再生方法 Download PDFInfo
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- WO2011151922A1 WO2011151922A1 PCT/JP2010/059538 JP2010059538W WO2011151922A1 WO 2011151922 A1 WO2011151922 A1 WO 2011151922A1 JP 2010059538 W JP2010059538 W JP 2010059538W WO 2011151922 A1 WO2011151922 A1 WO 2011151922A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
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- 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
- H04B10/272—Star-type networks or tree-type networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
- H04L7/0331—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop with a digital phase-locked loop [PLL] processing binary samples, e.g. add/subtract logic for correction of receiver clock
Definitions
- the present invention relates to a receiving device, a data identification / reproduction device, a PON system, and a data identification / reproduction method.
- Non-Patent Document 1 the standard of 10G-EPON (Ethernet (registered trademark) PON) that realizes a transmission rate of 10.3 Gbps can coexist with GE-PON having a transmission rate of 1.25 Gbps. It prescribes.
- Patent Document 1 a sampling clock having a frequency that is m times or more (m ⁇ 2) of a desired transmission rate among a plurality of transmission rates of reception signals (hereinafter referred to as multirate) is used.
- multirate a technique related to a multi-rate receiving apparatus that performs data identification / reproduction by oversampling and reproduction data selection is disclosed.
- the multi-rate receiving apparatus described in Patent Document 1 realizes the multi-rate receiving apparatus using a sampling clock having a frequency of m times or more of one desired transmission rate among the multi-rates. Therefore, in order for one multi-rate receiving apparatus to realize data identification / reproduction of a plurality of desired transmission rates, it is necessary to use a frequency that is at least m times the fastest transmission rate among the plurality of desired transmission rates. It is. Therefore, when performing data identification and reproduction of a data signal having a transmission rate smaller than the fastest transmission rate, a frequency of m times or more of the fastest transmission rate is used, and as a result of using a sampling clock having a frequency larger than necessary, There was a problem of wasting power consumption.
- the present invention has been made in view of the above, and when receiving data signals having different transmission rates, a receiving apparatus and data capable of performing data identification and reproduction at a plurality of transmission rates while suppressing power consumption It is an object of the present invention to obtain an identification reproduction device, a PON system, and a data identification reproduction method.
- the present invention receives a signal obtained by time-division-multiplexing transmission signals having a plurality of transmission rates as a received signal, and performs oversampling on the received signal.
- a receiving device that selects data to be reproduced from a sampling signal and performs data reproduction, a transmission rate acquisition unit that acquires a transmission rate of the received signal that is a target of data reproduction identification processing, and a transmission rate
- a sampling frequency control unit that determines a sampling frequency to be used for the oversampling based on the sampling frequency generator, and a sampling clock generation unit that generates a clock signal of the sampling frequency determined by the sampling frequency control unit, based on the clock signal The oversampling is performed.
- the receiving apparatus has an effect that, when receiving data signals having different transmission rates, it is possible to perform data identification and reproduction at a plurality of transmission rates while suppressing power consumption.
- FIG. 1 is a diagram illustrating a configuration example of the PON system according to the first embodiment.
- FIG. 2 is a diagram illustrating a configuration example of the data identification reproduction unit according to the first embodiment.
- FIG. 3 is a diagram showing the concept of oversampling points and reproduction data selection.
- FIG. 4 is a diagram illustrating an example of a transmission rate acquisition procedure according to the first embodiment.
- FIG. 5 is a diagram illustrating an example of a data identification reproduction procedure according to the first embodiment.
- FIG. 6 is a diagram illustrating a configuration example of a data identification reproduction unit according to the second embodiment.
- FIG. 7 is a diagram illustrating an example of a data identification reproduction procedure according to the second embodiment.
- FIG. 8 is a diagram illustrating a configuration example of a data identification reproduction unit according to the third embodiment.
- FIG. 9 is a diagram illustrating a configuration example of the data identification reproduction unit according to the fourth embodiment.
- FIG. 1 is a diagram showing a configuration example of a first embodiment of a PON system according to the present invention.
- the PON system of this embodiment includes terminal-side devices (ONU: Optical Network Unit) 2-1 and 2-2 connected to subscriber terminals, and station-side devices (OLT: Optical Line). Terminal) 1.
- the ONUs 2-1 and 2-2 and the OLT 1 are connected by the optical coupler 4 and the optical fiber 3.
- the number of ONUs is two (ONUs 2-1 and 2-2).
- the number of ONUs connected to the OLT 1 is not limited to this and may be any number.
- the ONU 2-1 transmits a data signal to the OLT 1 at a transmission rate of 1 Gbps
- the ONU 2-2 transmits a data signal to the OLT 1 at a transmission rate of 2 Gbps.
- the data signal transmitted from the ONU 2-1 and the data signal transmitted from the ONU 2-2 are time-division multiplexed and input to the OLT 1.
- the OLT 1 performs data identification and reproduction by oversampling and reproduction data selection with respect to data signals from the ONU 2-1 and ONU 2-2, that is, data signals having two kinds of transmission rates of 1 Gbps and 2 Gbps.
- the OLT 1 discriminates and reproduces the optical receiver 11 that converts the data signal transmitted by the ONU 2-1 and ONU 2-2 through the optical fiber 3 and the optical coupler 4 into an electric signal, and the electric signal converted by the optical receiver 11.
- Data identification / reproduction unit 12 a SERDES (SERializer / DESerializer) unit 13 that generates serial data by serial-parallel conversion of the serial data signal reproduced by the data identification / reproduction unit 12, and a SERDES unit 13
- a MAC (Media Access Control) processing unit 14 that performs parallel processing of data as data frames, performs data frame identification processing, and controls time-division multiple access of the ONU 2-1 and ONU 2-2.
- FIG. 1 only a function related to upstream communication (communication from ONU 2-1 and ONU 2-2 to OLT 1) is shown as a component of OLT 1.
- For downlink communication processing similar to that of the conventional OLT is performed.
- the MAC processing unit 14 has a function as a timing control unit that controls transmission / reception timing in the PON system. Specifically, when there is a data transmission request from the ONUs 2-1 and 2-2, the time for giving transmission permission to each of the ONUs 2-1 and 2-2 is determined based on the transmission request, Notify ONUs 2-1 and 2-2. The ONUs 2-1 and 2-2 transmit data signals in a time zone permitted based on the transmission permission from the OLT 1. Since the data signal transmitted from the ONU 2-1 and the data signal transmitted from the ONU 2-2 are time-division multiplexed, the MAC processing unit 14 provides a time period during which transmission permission is given to the ONU 2-1 and the ONU 2-2. Are different time zones. Since the MAC processing unit 14 performs the control as described above, it knows from which ONU the data signal received by the own device is transmitted based on the time when the device gives permission to transmit. can do.
- FIG. 2 is a diagram illustrating a configuration example of the data identification / reproduction unit 12.
- the data identification / reproduction unit 12 of the present embodiment includes a sampling clock generation unit 21, a sampling clock control unit 22, a data signal information acquisition unit (transmission rate acquisition unit) 23, and an oversampling unit. 24 and a reproduction data selection unit 25.
- the sampling clock generation unit 21 includes a sampling clock selection unit (clock selection unit) 31, a 3 GHz clock generation unit 32, and a 6 GHz clock generation unit 33.
- bit synchronization method is performed, for example, by detecting the rising and falling positions of a signal and determining a point close to the middle between these positions (a point far from the rising and falling positions) as a sampling point. .
- a signal sampled (oversampled) at a frequency higher than the transmission rate.
- FIG. 3 is a diagram showing a concept of oversampling points and reproduction data selection in data identification reproduction by oversampling and data reproduction selection.
- the input signal (reception signal) input to the data identification / reproduction unit 12 takes a value of HI (High) or LOW.
- HI High
- LOW Low
- sampling points after oversampling the input signal are shown.
- oversampling is performed three times, two sampling points # 0, # 1, and # 2 are generated for one input data sampling point (before oversampling).
- the data change point change from LOW to HI, change from HI to LOW
- the signal changes between # 2 and # 0. It can be estimated that there are rising and falling edges.
- the transmission data can be correctly reproduced by selecting the sampling point # 1 far from these change points as the reproduction data.
- the number of times to increase the oversampling ratio is determined by the expected distortion of the input signal (the amount of fluctuation of the signal waveform in the time axis direction) and the like.
- a sampling clock generation unit (3 GHz clock generation unit 32 that generates clock signals of oversampling frequencies respectively corresponding to these two transmission rates.
- 6 GHz clock generator 33 6 GHz clock generator 33.
- the jitter amount which is the amount of fluctuation in the time axis direction of the received signal waveform, is 0.5 (jitter amount when 1 bit transmission time is 1), and the frequency of the sampling clock is 3 for each transmission rate. Double. Therefore, a 3 GHz clock generation unit 32 that generates a 3 GHz clock (clock signal) and a 6 GHz clock generation unit 33 that generates a 6 GHz clock are provided.
- the sampling clock frequency is three times the transmission rate here, the ratio of the sampling clock frequency to the transmission rate may be set in consideration of the amount of jitter, etc. May be.
- the OLT 1 acquires the transmission rate used by the ONU 2-1 and ONU 2-2 for transmission.
- these transmission rates are obtained based on notifications from the ONUs 2-1 and 2-2.
- FIG. 4 is a diagram showing an example of a transmission rate acquisition procedure.
- OLT 1 grasps the transmission rate of each ONU in the course of the connection procedure.
- the OLT 1 transmits a signal called Discovery GATE to each ONU at a predetermined interval (step S1).
- This Discovery GATE includes a transmission rate at which the OLT 1 can be received.
- the following procedure is also included: time for accepting Register REQUEST (registration request) (time for permitting ONU to send Register REQUEST) Treq.
- the ONUs 2-1 and 2-2 that have received the Discovery GATE return a Register REQUEST to the OLT 1 within the Treq time zone (step S2).
- the Register REQUEST includes a transmission rate that can be transmitted by the own device (ONUs 2-1 and 2-2) and a transmission rate that is desired to be registered (a transmission rate used for transmitting a data signal).
- the OLT 1 that has received the Register REQUEST returns a Register (registration notification) to the transmission source ONUs (ONUs 2-1 and 2-2) (step S3), and transmits a GATE notifying the next transmission permission time zone (step S3).
- Step S4 The ONU that has received the Register returns a Register ACK (response to the Register) within the permitted transmission time zone (step S5). As described above, communication is possible between the OLT 1 and the ONUs 2-1 and 2-2.
- the transmission rate is obtained from each ONU in the course of the connection procedure as described above.
- the present invention is not limited to this, and the transmission rate may be obtained by other methods.
- the ONU communicates the changed transmission rate to the OLT 1 before changing the transmission rate when the ONU is requested to acquire the transmission rate separately from the ONU or when the transmission rate transmitted by the ONU can be changed. It is good also as a method of doing.
- the above connection procedure is performed by the MAC processing unit 14 of the OLT 1, and the MAC processing unit 14 holds the acquired transmission rate of each ONU. That is, the MAC processing unit 14 functions as a transmission information acquisition unit that acquires a transmission rate from each ONU that is a transmission source of the data signal.
- the MAC processing unit 14 functions as a transmission information acquisition unit.
- a transmission information acquisition unit is provided separately from the MAC processing unit 14, and the transmission information acquisition unit acquires the transmission rate from each ONU. Also good.
- FIG. 5 is a diagram showing an example of the data identification / reproduction procedure of the present embodiment.
- the MAC processing unit 14 acquires and holds the transmission rate. Since the MAC processing unit 14 grasps the transmission time zone of each ONU as described above, it can grasp which ONU is a data signal transmitted from a signal to be received. For each received signal, the MAC processing unit 14 manages, as data signal information, the reception time zone estimated from the permitted transmission time zone and the corresponding transmission rate.
- the sampling clock control unit 22 acquires the transmission rate by acquiring the data signal information from the MAC processing unit 14 (step S11). Then, the sampling clock control unit 22 determines a sampling frequency based on the data signal information (step S12), and selects a sampling clock corresponding to the sampling frequency from the usable sampling clocks (step S13). Specifically, the data signal information acquisition unit 23 acquires the data signal information from the MAC processing unit 14 and passes the data signal information to the sampling clock control unit 22. For example, every time the transmission rate is changed, the MAC processing unit 14 notifies the next transmission rate as data signal information only a predetermined time before the changed time.
- the MAC processing unit 14 stores information on which transmission rate and at which time each burst signal in the next allocation period arrives for each allocation period (including information on a period during which data transmission is not performed). For example, the sampling clock control unit 22 may be notified as data signal information.
- the sampling clock control unit 22 grasps the transmission rate of the received signal to be received based on the data signal information, determines the sampling frequency for oversampling for each burst signal based on the transmission rate, and can use the sampling signal.
- a sampling clock corresponding to the sampling frequency is selected from the clocks. In this case, oversampling is performed at 3 times the transmission rate, 3 GHz is selected as the sampling clock when the transmission rate is 1 Gbps, and 6 GHz is selected when the transmission rate is 2 Gbps.
- the sampling clock control unit 22 When 3 GHz is selected as the sampling clock (when the transmission rate is 1 Gbps), the sampling clock control unit 22 instructs the 3 GHz clock generation unit 32 to start, and instructs the 6 GHz clock generation unit 33 to stop.
- the selector 31 is instructed to output the sampling clock input from the 3 GHz clock generator 32.
- the sampling clock control unit 22 selects 6 GHz as the sampling clock (when the transmission rate is 2 Gbps)
- the sampling clock control unit 22 instructs the 6 GHz clock generation unit 33 to start and the 3 GHz clock generation unit 32 to stop.
- the sampling clock selection unit 31 is instructed to output the sampling clock input from the 6 GHz clock generation unit 33.
- the transmission rate is 0 pbs (when there is no signal to be received)
- the sampling clock control unit 22 instructs the 3 GHz clock generation unit 32 and the 6 GHz clock generation unit 33 to stop and the sampling clock selection unit 31 Instruct to stop output.
- the oversampling unit 24 and the reproduction data selection unit 25 perform data reproduction selection processing on the received signal (step S13). Specifically, the oversampling unit 24 oversamples the reception signal input from the optical receiver 11 using the sampling clock output from the sampling clock selection unit 31, and a signal after oversampling (sampling result) Is output to the reproduction data selection unit 25.
- the reproduction data selection unit 25 selects reproduction data from the input sampling result, and outputs the reproduction data to the SERDES unit 13 using the sampling clock input from the sampling clock selection unit 21.
- two types of transmission rates corresponding to the OLT 1 are provided and two types of clock generation units are provided.
- the transmission rate corresponding to the OLT 1 is m (m is an integer of 3 or more)
- m is used. What is necessary is just to provide a kind of clock generation part.
- oversampling is performed three times for both the 1 Gbps transmission rate and the 3 Gbps transmission rate, but the oversampling ratio may be different depending on the transmission rate.
- a plurality of clock generation units (3 GHz clock generation unit 32, 6 GHz clock generation unit 33) corresponding to the transmission rate are provided, and the transmission rate of the received signal is acquired from the MAC processing unit 14, Based on the transmission rate, the clock generation unit corresponding to the sampling used for reproduction data selection is operated, and the clock generation unit not used for reproduction data selection is stopped. Therefore, a circuit that generates a sampling clock having a frequency exceeding the necessary frequency can be stopped, and power consumption can be suppressed. Further, when the transmission rate is 0 Gbps (when there is no received signal), the power generation can be further reduced by stopping the clock generation unit and sampling clock selection unit 31.
- FIG. FIG. 6 is a diagram illustrating a configuration example of the second embodiment of the data identification reproducing unit 12a of the OLT according to the present invention.
- the configuration of the OLT of the present embodiment is the same as that of the OLT 1 of the first embodiment, except that the data identification / reproduction unit 12 of the OLT 1 of the first embodiment is replaced with a data identification / reproduction unit 12a.
- the configuration of the PON system of the present embodiment is the same as that of the PON system of the first embodiment except that the OLT 1 of the first embodiment is replaced with the OLT of the present embodiment.
- Components having the same functions as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.
- a sampling clock source that generates the sampling clock for each sampling clock is provided, and the sampling clock source is selected according to the transmission rate. I made it.
- the minimum sampling frequency only one sampling clock source (hereinafter referred to as the minimum sampling frequency) corresponding to the lowest transmission rate among the assumed transmission rates is provided, and the sampling clock according to the transmission rate. The sampling clock generated by the source is multiplied and used.
- the data identification / reproduction unit 12a is the same as the data identification / reproduction unit 12 according to the first embodiment except that a sampling clock 21a is provided instead of the sampling clock generation unit 21.
- the sampling clock generation unit 21a includes the same 3 GHz clock generation unit 32 and the clock multiplication unit 34 as in the first embodiment.
- the configuration example of FIG. 6 includes a 3 GHz clock generation unit 32 that generates a sampling clock of 3 GHz as the minimum sampling frequency.
- FIG. 7 is a diagram showing an example of the data identification reproduction procedure of the present embodiment.
- the sampling clock control unit 22 acquires the transmission rate by acquiring data signal information from the MAC processing unit 14 (step S21).
- the sampling clock controller 22 determines an oversampling sampling frequency (referred to as an oversampling frequency) based on the acquired transmission rate (step S22).
- an oversampling frequency referred to as an oversampling frequency
- a frequency that is three times the transmission rate is set as the oversampling frequency.
- the sampling clock control unit 22 determines the ratio of the determined oversampling frequency and the minimum sampling frequency as a multiplication factor (step S23), and notifies the determined multiplication factor to the clock multiplication unit 34.
- the oversampling frequency is 3 GHz, which is the same as the clock generated by the 3 GHz clock generation unit 32, so the multiplication factor is 1.
- the oversampling frequency is 6 GHz, which is the same as the clock generated by the 3 GHz clock generation unit 32, so the multiplication factor is 2.
- the transmission rate is 0 Gbps
- the sampling clock control unit 22 notifies the clock multiplication unit 34 of the multiplication rate and instructs the 3 GHz clock generation unit 32 to stop the operation.
- the clock multiplication unit 34 multiplies the clock input from the 3 GHz clock generation unit 32 based on the multiplication rate instructed from the sampling clock control unit 22 and outputs the result to the oversampling unit 24 and the retransmission data selection unit 25. Then, the oversampling unit 24 and the reproduction data selection unit 25 perform a data reproduction selection process on the received signal as in the first embodiment (step S24).
- the operations of the present embodiment other than those described above are the same as those of the first embodiment.
- the oversampling ratio of both 1 Gbps and 2 Gbps data signals is the same, but the oversampling ratio may be changed for each transmission rate. Further, in the present embodiment, the case where there are two types of transmission rates has been described, but in the case where there are three or more types, the multiplication rate may be determined based on the transmission rate and the oversampling ratio.
- one sampling clock source that generates a sampling frequency corresponding to the lowest transmission rate among the assumed transmission rates is provided, and the lowest sampling frequency is set based on the transmission rate of the received signal. Generated multiplied sampling clock. Therefore, it is possible to suppress power consumption without performing sampling at a frequency exceeding the necessary frequency. Further, when the transmission rate is 0 Gbps (when there is no received signal), the power generation can be further reduced by stopping the clock generation unit and sampling clock selection unit 31.
- FIG. FIG. 8 is a diagram illustrating a configuration example of the third embodiment of the data identification reproducing unit 12a of the OLT according to the present invention.
- the configuration of the OLT of the present embodiment is the same as that of the OLT 1 of the first embodiment, except that the data identification / reproduction unit 12 of the OLT 1 of the first embodiment is replaced with a data identification / reproduction unit 12b.
- the configuration of the PON system of the present embodiment is the same as that of the PON system of the first embodiment except that the OLT 1 of the first embodiment is replaced with the OLT of the present embodiment. As shown in FIG.
- the data identification / reproduction unit 12b of the present embodiment is the same as the data identification / reproduction unit 12 of the first embodiment except that a transmission rate determination unit 26 is added.
- Components having the same functions as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.
- the transmission rate is acquired by acquiring the data signal information from the MAC processing unit 14.
- the transmission rate is not acquired from the outside, but is acquired by the transmission rate determination unit 26 estimating based on the received signal.
- data signal information is acquired from the MAC processing unit 14, and this data signal information includes the start timing of a data signal (burst signal) transmitted in one transmission permission time zone.
- the transmission rate may not be included in the data signal information. That is, in the present embodiment, data reproduction identification can be performed even when the OLT 1 does not know the transmission rate transmitted from each ONU.
- the start timing of the data signal is obtained by the MAC processing unit 14 based on the transmission timing of each ONU and the transmission time from each ONU to the OLT 1.
- the data signal information acquisition unit 23 acquires the start timing of the data signal (the start time of the time zone permitted to transmit to the ONU) as the data signal information.
- the data signal information acquisition unit 23 notifies the sampling clock control unit 22 of the data signal information.
- the sampling clock control unit 22 sets 2 Gbps, which is the maximum transmission rate among the assumed transmission rates, as the initial transmission rate at the data start timing, and generates a 6 GHz clock that generates an oversampling frequency corresponding to the initial transmission rate.
- the generation unit 33 is selected.
- the sampling clock control unit 22 instructs the 6 GHz clock generation unit 33 to start, instructs the 3 GHz clock generation unit 32 to stop, and inputs the sampling clock input from the 6 GHz clock generation unit 33 to the sampling clock selection unit 31. Is output.
- the oversampling unit 24 uses the sampling clock input from the sampling clock selection unit 31 to oversample the received data signal.
- the sampling result is output to the reproduction data selection unit 25 and the transmission rate determination unit 26.
- the transmission rate determination unit 26 determines a change point of the data signal based on the input sampling result, determines the transmission rate based on the information of the determined change point, and sends the determined transmission rate to the data signal information acquisition unit 23. Output.
- any method may be used. For example, the following method is used. *
- oversampling is performed using a 6 GHz sampling clock when either 1 Gbps or 2 Gbps signals may be input.
- the transmission rate of the received signal is 2 Gbps, as shown in FIG. 3, when a change point (HI to LOW or LOW to HI) is detected, three sampling points are set between the change point and the change point. There is a point.
- the transmission rate of the received signal is 1 Gbps, there are six sampling points between the change points. Therefore, the transmission rate can be estimated (determined) based on the change point and the interval between the change points.
- the interval between the change points can be realized by, for example, a method of counting the number of sampling points or a method of measuring the time interval between the change points.
- the data signal information acquisition unit 23 outputs the transmission rate input from the transmission rate determination unit 26 to the sampling clock control unit 22. Thereafter, similarly to steps S12, 13, and S14 of the first embodiment, the selection of the clock generation unit and the data identification / reproduction process are performed based on the transmission rate.
- the operations of the present embodiment other than those described above are the same as those of the first embodiment.
- the data signal information acquisition unit 23 acquires the data signal information including the end timing of the data signal, and the sampling clock control unit 22 performs the data signal end timing and the start timing of the next data signal.
- the transmission rate is 0 Gbps
- the 3 GHz clock generation unit 32 and the 6 GHz clock generation unit 33 are instructed to stop and the sampling clock selection unit 31 is instructed to stop the output. Good.
- the start timing of the data signal is acquired from the MAC processing unit 14.
- the start timing is estimated based on the received signal without being acquired from the MAC processing unit 14. Good.
- the start timing is estimated by the following method.
- the sampling clock control unit 22 selects a clock generation unit (6 GHz clock generation unit 33 in the example of FIG. 8) corresponding to the fastest transmission rate.
- a sampling sequence that does not come close to the change point as in # 1 of the example of FIG. Exists. That is, there is a sampling sequence that does not become a change point even if the change point is detected over a certain period of time.
- the head of the data signal is a pattern for synchronization and is not transmission data that is information to be transmitted. Therefore, the above determination may be made before transmission of transmission data is started.
- the present embodiment includes the transmission rate determination unit 26 in addition to the data identification and reproduction unit 12 of the first embodiment.
- the transmission rate determination unit 26 determines the transmission rate based on the sampling result, and the transmission rate is determined. Until the judgment is made, the sampling clock having the highest frequency expected is used. Therefore, the same effect as in the first embodiment can be obtained, and the input signal from the MAC processing unit 14 can be reduced as compared with the first embodiment. Even if the transmission rate cannot be acquired from the MAC processing unit 14 for some reason, the transmission rate determining unit 26 can determine the transmission rate, and thus the same effect as in the first embodiment can be obtained.
- FIG. 9 is a diagram illustrating a configuration example of the fourth embodiment of the data identification reproducing unit 12c of the OLT according to the present invention.
- the configuration of the OLT of the present embodiment is the same as that of the OLT of the second embodiment except that the data identification / playback unit 12a of the OLT of the second embodiment is replaced with a data identification / playback unit 12c.
- the configuration of the PON system of the present embodiment is the same as that of the PON system of the first embodiment except that the OLT 1 of the first embodiment is replaced with the OLT of the present embodiment. As shown in FIG.
- the data identification / reproduction unit 12c of the present embodiment is the same as the data identification / reproduction unit 12a of the second embodiment, except that a transmission rate determination unit 26 similar to that of the third embodiment is added. is there.
- Components having the same functions as those in the second embodiment or the third embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.
- the transmission rate determination unit 26 transmits the same as in the third embodiment. The rate is obtained based on the sampling result.
- the data signal information acquisition unit 23 acquires the start timing of the data signal as the data signal information.
- the data signal information acquisition unit 23 notifies the sampling clock control unit 22 of the data signal information.
- the sampling clock control unit 22 sets 2 Gbps, which is the maximum transmission rate among the assumed transmission rates, as an initial transmission rate, and an oversampling frequency of 6 GHz corresponding to the initial transmission rate and a minimum sampling frequency The ratio is calculated as a multiplication factor (2 in this case). Then, the sampling clock control unit 22 notifies the clock multiplication unit 34 of the multiplication rate.
- the oversampling unit 24 uses the sampling clock input from the sampling clock selection unit 31 to oversample the received data signal.
- the sampling result is output to the reproduction data selection unit 25 and the transmission rate determination unit 26.
- the transmission rate determination unit 26 determines the transmission rate based on the sampling result as in the third embodiment, and notifies the data signal information acquisition unit 23 of the transmission rate. Thereafter, similarly to steps S22, S23, and S24 of the second embodiment, determination of oversampling frequency, determination of multiplication rate, and data identification / reproduction processing are performed based on the transmission rate.
- the operations of this embodiment other than those described above are the same as those of the second or third embodiment.
- the start timing of the data signal is acquired from the MAC processing unit 14, but the start timing may be estimated based on the sampling result as in the third embodiment.
- the present embodiment includes the transmission rate determination unit 26 in addition to the data identification and reproduction unit 12 of the second embodiment.
- the transmission rate determination unit 26 determines the transmission rate based on the sampling result, and the transmission rate is determined. Until the judgment is made, the sampling clock having the highest frequency expected is used. Therefore, the same effects as those of the second embodiment can be obtained, and the input signal from the MAC processing unit 14 can be reduced as compared with the second embodiment. Even if the transmission rate cannot be acquired from the MAC processing unit 14 for some reason, the transmission rate determining unit 26 can determine the transmission rate, and thus the same effect as in the first embodiment can be obtained.
- the receiving device, the data identification / reproduction device, the PON system, and the data identification / reproduction method according to the present invention are useful for a PON system in which a plurality of transmission rates are mixed, and in particular, a PON system for reducing power consumption Suitable for
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Abstract
Description
図1は、本発明にかかるPONシステムの実施の形態1の構成例を示す図である。図1に示すように、本実施の形態のPONシステムは、加入者端末に接続される端末側装置(ONU:Optical Network Unit)2-1,2-2と、局側装置(OLT:Optical Line Terminal)1と、で構成される。ONU2-1,2-2とOLT1は、光カップラ4と光ファイバ3とで接続されている。なお、図1では、ONUの台数を2台(ONU2-1,2-2)としているがOLT1に接続するONUの台数はこれに限らず何台としてもよい。
図6は、本発明にかかるOLTのデータ識別再生部12aの実施の形態2の構成例を示す図である。本実施の形態のOLTの構成は、実施の形態1のOLT1のデータ識別再生部12をデータ識別再生部12aに代える以外は実施の形態1のOLT1と同様である。また、本実施の形態のPONシステムの構成は、実施の形態1のOLT1を本実施の形態のOLTに代える以外は実施の形態1のPONシステムと同様である。実施の形態1と同様の機能を有する構成要素は、実施の形態1と同一の符号を付して説明を省略する。
図8は、本発明にかかるOLTのデータ識別再生部12aの実施の形態3の構成例を示す図である。本実施の形態のOLTの構成は、実施の形態1のOLT1のデータ識別再生部12をデータ識別再生部12bに代える以外は実施の形態1のOLT1と同様である。また、本実施の形態のPONシステムの構成は、実施の形態1のOLT1を本実施の形態のOLTに代える以外は実施の形態1のPONシステムと同様である。図8に示すように、本実施の形態のデータ識別再生部12bは、伝送レート判定部26を追加する以外は、実施の形態1のデータ識別再生部12と同様である。実施の形態1と同様の機能を有する構成要素は、実施の形態1と同一の符号を付して説明を省略する。
図9は、本発明にかかるOLTのデータ識別再生部12cの実施の形態4の構成例を示す図である。本実施の形態のOLTの構成は、実施の形態2のOLTのデータ識別再生部12aをデータ識別再生部12cに代える以外は実施の形態2のOLTと同様である。また、本実施の形態のPONシステムの構成は、実施の形態1のOLT1を本実施の形態のOLTに代える以外は実施の形態1のPONシステムと同様である。図8に示すように、本実施の形態のデータ識別再生部12cは、実施の形態3と同様の伝送レート判定部26を追加する以外は、実施の形態2のデータ識別再生部12aと同様である。実施の形態2または実施の形態3と同様の機能を有する構成要素は、実施の形態1と同一の符号を付して説明を省略する。
2-1,2-2 ONU
3 光ファイバ
4 光カップラ
11 光受信器
12 データ識別再生器
13 SERDES部
14 MAC処理部
21 サンプリングクロック生成部
22 サンプリングクロック制御部
23 データ信号情報取得部
24 オーバーサンプリング部
25 再生データ選択部
26 伝送レート判定部
31 サンプリングクロック選択部
32 3GHzクロック生成部
33 6GHzクロック生成部
34 クロック逓倍部
Claims (11)
- 時分割多重された複数の伝送レートの送信信号を、受信信号として受信し、前記受信信号に対してオーバーサンプリングを施したオーバーサンプリング信号のうち再生対象とする再生データを選択してデータ識別再生を行う受信装置であって、
前記データ再生識別処理対象の前記受信信号の伝送レートを取得する伝送レート取得部と、
前記伝送レートに基づいて前記オーバーサンプリングに用いるサンプリング周波数を決定するサンプリング周波数制御部と、
前記サンプリング周波数制御部が決定した前記サンプリング周波数のクロック信号を生成するサンプリングクロック生成部と、
を備え、
前記クロック信号に基づいて前記オーバーサンプリングを実施する、
ことを特徴とする受信装置。 - 前記伝送レート取得部は、前記複数の伝送レートのバースト信号が時分割多重された受信信号における割当て周期毎の伝送レートを取得し、
前記サンプリング周波数制御部は、前記割当て周期毎に各バースト信号のサンプリング周波数を決定する、
ことを特徴とする請求項1記載の受信装置。 - 前記送信信号の送信元装置における前記送信信号の送信タイミングを決定し、また前記送信元装置から前記送信信号の伝送レートを取得するタイミング制御部、
をさらに備え、
前記伝送レート取得部は、前記タイミング制御部から前記伝送レートを取得する、
ことを特徴とする請求項1または2に記載の受信装置。 - 前記伝送レート取得部は、前記データ再生識別処理対象の前記受信信号に対応する前記オーバーサンプリング信号に基づいて当該受信信号の伝送レートを取得する、
ことを特徴とする請求項1または2に記載の受信装置。 - 前記サンプリング周波数制御部は、前記受信信号の受信開始時には、予め定められた前記サンプリング周波数に決定し、前記伝送レート取得部において伝送レートを取得した場合は、前記取得した伝送レートに基づいて前記サンプリング周波数を決定する、
ことを特徴とする請求項4に記載の受信装置。 - 前記サンプリングクロック生成部は、
前記伝送レートに対応するサンプリング周波数のクロック信号を生成する複数のクロック生成部と、
前記サンプリング周波数制御部が決定した前記サンプリング周波数に基づいて、前記複数のクロック生成部から出力される前記クロック信号のうち出力するクロック信号を選択するサンプリングクロック選択部と、
を備えることを特徴とする請求項1~5のいずれか1つに記載の受信装置。 - 前記サンプリング周波数制御部は、決定した前記サンプリング周波数の前記複数の伝送レートのうち最小の伝送レートに対応するサンプリング周波数に対する比を逓倍率として求め、
前記サンプリングクロック生成部は、
前記複数の伝送レートのうち最小の伝送レートに対応するサンプリング周波数のクロック信号を生成するクロック生成部と、
前記サンプリング周波数制御部が決定した前記逓倍率に基づいて、前記クロック生成部から出力される前記クロック信号を逓倍するクロック逓倍部と、
を備えることを特徴とする請求項1~5のいずれか1つに記載の受信装置。 - 前記サンプリング周波数制御部は、前記サンプリング周波数をさらに前記受信信号のジッタ量に基づいて決定する、
ことを特徴とする請求項1~7のいずれか1つに記載の受信装置。 - 時分割多重された複数の伝送レートの送信信号を受信信号として受信し、前記受信信号に対してオーバーサンプリングを施したオーバーサンプリング信号のうち再生対象とする再生データを選択してデータ識別再生を行なうデータ再生識別装置であって、
前記データ再生識別処理対象の前記受信信号の伝送レートを取得する伝送レート取得部と、
前記伝送レートに基づいて前記オーバーサンプリングに用いるサンプリング周波数を決定するサンプリング周波数制御部と、
前記サンプリング周波数制御部が決定した前記サンプリング周波数のクロック信号を生成するサンプリングクロック生成部と、
を備え、
前記クロック信号に基づいて前記オーバーサンプリングを実施する、
ことを特徴とするデータ識別再生装置。 - 加入者側装置と、前記加入者側装置から送信され、時分割多重された複数の伝送レートの送信信号を、受信信号として受信し、前記受信信号に対してオーバーサンプリングを施したオーバーサンプリング信号のうち再生対象とする再生データを選択してデータ識別再生を行なう局側装置と、を備えるPONシステムであって、
前記局側装置は、
前記データ再生識別処理対象の前記受信信号の伝送レートを取得する伝送レート取得部と、
前記伝送レートに基づいて前記オーバーサンプリングに用いるサンプリング周波数を決定するサンプリング周波数制御部と、
前記サンプリング周波数制御部が決定した前記サンプリング周波数のクロック信号を生成するサンプリングクロック生成部と、
を備え、
前記クロック信号に基づいて前記オーバーサンプリングを実施する、
ことを特徴とするPONシステム。 - 時分割多重された複数の伝送レートの送信信号を受信信号として受信し、前記受信信号に対してオーバーサンプリングを施したオーバーサンプリング信号のうち再生対象とする再生データを選択してデータ識別再生を行なう受信装置におけるデータ識別再生方法であって、
前記データ識別再生処理対象の前記受信信号の伝送レートを取得する伝送レート取得ステップと、
前記伝送レートに基づいて前記オーバーサンプリングに用いるサンプリング周波数を決定するサンプリング周波数制御ステップと、
前記サンプリング周波数制御部が決定した前記サンプリング周波数のクロック信号を生成するサンプリングクロック生成ステップと、
前記クロック信号に基づいて前記オーバーサンプリングを実施するオーバーサンプリングステップと、
含むことを特徴とするデータ識別再生方法。
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JP2016171387A (ja) * | 2015-03-11 | 2016-09-23 | 株式会社日立製作所 | クロックデータリカバリ回路 |
WO2017090207A1 (ja) * | 2015-11-27 | 2017-06-01 | 三菱電機株式会社 | 光受信器、光通信装置および制御方法 |
JPWO2017090207A1 (ja) * | 2015-11-27 | 2018-03-22 | 三菱電機株式会社 | 光受信器、光通信装置および制御方法 |
Also Published As
Publication number | Publication date |
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KR20130038331A (ko) | 2013-04-17 |
US20130077971A1 (en) | 2013-03-28 |
JP5393885B2 (ja) | 2014-01-22 |
CN102918794A (zh) | 2013-02-06 |
US9025964B2 (en) | 2015-05-05 |
JPWO2011151922A1 (ja) | 2013-07-25 |
KR101443543B1 (ko) | 2014-09-22 |
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