WO2003103244A1 - データ伝送システム - Google Patents
データ伝送システム Download PDFInfo
- Publication number
- WO2003103244A1 WO2003103244A1 PCT/JP2003/006806 JP0306806W WO03103244A1 WO 2003103244 A1 WO2003103244 A1 WO 2003103244A1 JP 0306806 W JP0306806 W JP 0306806W WO 03103244 A1 WO03103244 A1 WO 03103244A1
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- WIPO (PCT)
- Prior art keywords
- signal
- polarity
- data
- connector
- differential transmission
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
- H04L25/085—Arrangements for reducing interference in line transmission systems, e.g. by differential transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
- H04L7/046—Speed or phase control by synchronisation signals using special codes as synchronising signal using a dotting sequence
Definitions
- an object of the present invention is to provide a data transmission system capable of performing normal transmission regardless of the polarity of a cable. Disclosure of the invention
- this aspect is a system for transmitting data between a transmitting device and a receiving device by transmitting a differential signal using two transmission lines having polarities.
- the transmitting apparatus performs the difference including a polarity determination signal having a constant signal level in a length including a predetermined number of symbol data.
- a dynamic transmission signal is generated and transmitted on the transmission line.
- the receiving device includes a connector unit, a timing correction unit, a polarity determination unit, and a signal processing unit.
- the connector section is a connector unit, a timing correction unit, a polarity determination unit, and a signal processing unit.
- the detection timing is corrected when the symbol data of a larger number than the predetermined number is continuously incorrect, so that the detection timing is corrected for the polarity determination signal.
- the detection timing is not corrected. Therefore, symbol data included in the differential transmission signal can be reliably detected. In other words, synchronization can be reliably established.
- the signal processing unit may include a normal processing unit and a polarity inversion processing unit.
- the normal processing unit when it is determined that the connection relationship of the connector unit to the transmission line is positive, applies a first signal to the differential transmission signal received by the connector unit. Execute the process.
- the polarity inversion processing unit is configured to perform a second processing on the differential transmission signal received by the connector unit when the connection relation of the connector unit to the transmission line is determined to have the opposite polarity. Perform. Further, the normal processing section and the polarity inversion processing section each derive the same processing result for the same differential transmission signal transmitted on the transmission line. Perform 1st and 2nd processing.
- the differential signal transmitted using the two transmission lines having polarities is detachably attached to the transmission line. It may be provided as a signal processing circuit for inputting via a connected connector and performing predetermined processing.
- the signal processing circuit includes an input terminal, a timing correction unit, a polarity determination unit, and a signal processing unit.
- the input terminal inputs the differential transmission signal including the polarity judgment signal whose signal level is constant over the length including the predetermined number of the connectors from the ⁇ ad connector and the input terminal. It is for the future.
- the evening correction unit outputs the signal level at the symbol position from the differential transmission signal.
- the polarity judging section detects a polarity judging signal included in the differential transmission signal input from the writing input terminal, and based on the signal level of the polarity judging signal, ⁇ the connection to the Bd transmission line. Judge whether the connection relation of the data section is positive polarity or reverse polarity.
- the signal processing unit determines that the connection of the connector to the transmission line is positive.
- the predetermined process is performed by treating the differential transmission; 1 ⁇ signal as a signal whose polarity is inverted.
- FIG. 4 is a diagram for explaining the input / output relationship of the AZD converter 206 shown in FIG.
- FIG. 5 is a diagram for explaining the details of the operation of the timing reproduction unit 208.
- FIG. 6 is a flowchart showing the flow of processing of the transmission device in the first embodiment.
- FIG. 7 is a flowchart showing a processing flow of the receiving device in the first embodiment.
- FIG. 8 is a flowchart showing a processing flow of the receiving apparatus in the first embodiment.
- FIG. 10 is a diagram schematically illustrating values indicated by data output from the symbol data extraction unit 209 illustrated in FIG. 3 when the polarity of the differential transmission signal is inverted. .
- FIG. 11 is a diagram for explaining a method of calculating a threshold value.
- FIG. 12 is a block diagram showing a detailed configuration of the data determination unit 210 shown in FIG.
- FIG. 13 shows the data determination unit 2 10 shown in FIG.
- FIG. 4 is a diagram showing a correspondence relationship between conversions in two decoding circuits.
- FIG. 14 is a flowchart showing the flow of processing of the receiving device according to the second embodiment.
- FIG. 16 is a diagram schematically showing the polarity inversion processing in the polarity inversion circuit 20085 shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a block diagram showing a configuration of a data transmission system according to a first embodiment of the present invention.
- a device 1 to 5 constitute a ring-type network. Therefore, in the present embodiment, the device that has received data from one adjacent device transmits the data to the other adjacent device, so that the data is transmitted over the network. It is transmitted in a ring.
- each device that performs data transmission is connected by a twisted pair cable having polarity.
- data transmission between the devices is performed by differential transmission using differential signals.
- the configuration of the network is not limited to a ring type, and a system in which differential transmission is performed by a transmission line having polarity between devices is provided. The system can be in any form.
- the differential transmission signal processing unit 12 decodes the differential transmission signal received via the connector 11 by a predetermined decoding process described later.
- the data decoded by the differential transmission signal processing unit 12 is referred to as decoded data.
- the differential transmission signal processing unit 12 outputs the data input from the upper layer data processing unit 13 as a differential transmission signal.
- the output differential transmission signal is transmitted to another device via the connector.
- the differential transmission signal processing unit 12 adds polarity determination data to the data input from the upper layer data processing unit 13. Output as a differential transmission signal To force.
- the upper layer data processing unit 13 processes the data processed by the CPU 14 and the differential transmission signal processing unit 12.
- FIG. 3 is a block diagram showing a detailed configuration of the differential transmission signal processing unit 12 shown in FIG.
- the differential transmission signal processing unit 12 includes a transmission processing unit 201, a 07-combiner 202, a mouth-pass filter (LPF) 203, and a driver 2 0 4, receiver 205, and A / D connector — evening (shown as “A / D” in FIG. 3) 206, digital filter 200, and timing It has a reproducing unit 208, a symbol data extracting unit 209, a data judging unit 210, a polarity judging unit 211, and a training processing unit 212.
- LPF mouth-pass filter
- the data output from the transmission processing unit 201 is subjected to DZA conversion by the D / A converter 202, and then converted to the LPF 203 and the drain 204. Via the other device.
- 2-bit 8-level transmission shall be performed.
- the D / A converter 202 converts 2-bit digital data into analog data.
- the differential transmission signal includes Two bits of data are assigned as one symbol for the signal level. Further, the differential transmission signal is generated such that the symbol data is included every time the signal is transmitted for a predetermined time interval.
- the differential transmission signal is composed of a synchronization establishment signal, a polarity determination signal, a training signal, and a transmission signal.
- the synchronization establishment signal is a signal including a synchronization confirmation II signal for starting the connector polarity determination by the receiving device, identifying the polarity determination data, and including a signal for the synchronization establishment.
- the polarity determination signal is a signal including polarity determination data for determining the polarity of the connection.
- the training signal is a signal used in training processing described later.
- the transmission signal is a signal including data to be transmitted.
- the polarity determination signal has a predetermined waveform pattern, and the signal level is constant over a length including a predetermined number of symbol data.
- the polarity determination signal has a J-parallel pattern during the same value of 3 symbols (see FIG. 9).
- the differential transmission signal is generated such that, except for the part of the polarity determination signal, the symbol position is the position of the peak of the waveform.
- the waveform of the differential transmission signal (excluding the portion of the constant polarity signal) becomes a waveform pattern that peaks at a predetermined time interval ⁇ , and the position of the peak is It will be the cylinder position.
- Each device shown in Fig. 1 reads the signal level at the relevant symbol position for a differential transmission signal transmitted from another device, and converts it to digital data. By doing so, the transmission data can be read.
- the differential transmission signal transmitted from another device is received by the receiver 205 via the connector 11.
- the differential transmission signal received by the receiver 205 is subjected to AZD conversion by the A / D converter 206.
- the A / D-converted differential transmission signal is input to the digital reflex 206 and the evening reproduction section 208, and the A / D amplifier 206 is input to the The input analog 7 is converted into digital data of multiple hits.
- the A / D converter 206 converts the input analog input digital data into 0-bit digital data.
- FIG. 4 is a diagram for explaining the input / output relationship of the A / D comparator 206 shown in FIG. In Fig. 4, the curve is
- the A / D 3 member overnight 206 is at the analog sampling interval t- * at a predetermined sampling interval t (t is sufficiently shorter than the predetermined time interval ⁇ described above). And converts the magnitude of the signal level into a 10-bit signal. It should be noted that, for 10 bits,
- sampling is performed at an interval t shorter than the predetermined time interval T, and 1
- the conversion to 0-bit digital data is performed in order to reproduce multi-valued symbols of differential input signals with high precision.
- the waveform of the differential transmission signal is converted into a 10-bit digital signal
- the 10-bit digital signal is converted into a 2-bit digital signal. Convert to a bit of digital video.
- the 2-bit digital data is the data representing the content of the data contained in the differential transmission signal.
- the differential transmission signal converted to a 10-bit digital signal by the A / D converter 206 is the same as the digital signal. 0 7 and input to the timing playback section 208
- the high-frequency noise canceler 207 removes high-frequency noise components from the input 10-bit digital signal.
- the evening reproducing section 208 determines timing (detection evening) for detecting a symbol from a 10-bit digital hawk.
- the detection timing is a timing for extracting a meaningful data (symbolde) from a 10-bit digital data.
- the time interval of the detection timing is an interval in which the difference S3 ⁇ 4 transmission signal includes the symbol data, that is, the predetermined time interval T described above.
- the digital data that has been AZD-converted at the sampling interval t in the A / D comparator 206 is a symbolic data in which all of the output digital data is significant. It is not an indication. Therefore, the timing reproduction unit 2 extracts the symbol data from the digital data output from the AZD control unit 206.
- FIG. 5 is a diagram for explaining the details of the operation of the evening-swing playback unit 208.
- the points shown in Fig. 5 show the 10-bit digital data input sequentially from the AZD connector 206 at time intervals t.
- the timing playback section 208 is connected to the A / D Data is extracted from the data input from the server 206 according to the detection timing determined at that time.
- the evening timing reproduction unit 208 receives the data extracted at the detection timing (data at time ta) and the data (time data) input immediately before the detection timing. tb) and the data input immediately after the detection timing (data at time tc).
- the timing playback unit 208 continuously detects the data input from the AZD control unit 206 data for a predetermined number of data units. If the timing is incorrect, correct the detection timing.
- the predetermined number is determined by the number of symbol data having the same value continuously in the polarity determination signal. In the present embodiment, the number of symbol data that continuously have the same value in the polarity determination signal is three, and thus the predetermined number may be a number greater than three.
- the detection timing continues for a predetermined number of times. There is no possibility that it will be mistakenly determined to be wrong.
- the polarity determination signal has a constant signal level (the signal level at the time ta, tb, and tc described above). Correction cannot be performed correctly because the values are the same). Therefore, if it is determined that the signal is incorrect, the detection timing cannot be corrected correctly, and the subsequent signals must be read correctly. May not be possible. Therefore, in the present embodiment, the length of the portion where the signal level in the polarity determination signal is constant is shorter than the length of the signal determined to correct the detection imaging. This ensures that signals are read reliably and accurately.
- the timing reproducing unit 208 corrects the detection timing so that the detection timing is the timing for detecting the position of the peak of the waveform.
- the specific method of the correction may be any method. For example, in the case of detection as shown in Fig. 5 (b), if the maximum value should be detected with correct detection timing, the time tb is closest to the detection timing. it is conceivable that . Therefore, in this case, correction is made so that the time point at which the time T has elapsed from the time tb is set as the next detection timing.
- the symbol data extraction unit 209 is determined by the timing reproduction unit 208 from the digital data input from the digital filter 207.
- the data is extracted according to the specified symbol timing. That is, the timing reproducing unit 208 sends an instruction to extract data to the symbolic overnight extracting unit 209 at the determined timing.
- the symbol data extraction unit 209 extracts the symbol data from the 10-bit digital data input from the digital filter 207.
- the extracted symbol data is input to a data determination unit 210, a polarity determination unit 211, and a training processing unit 212.
- the polarity determination unit 211 determines the polarity of the connector, that is, the connection relationship between the twisted pair cable and the connector, based on the polarity determination data transmitted prior to the transmission data. Or reverse polarity.
- the judgment result is input to the data judgment unit 210.
- the training processing unit 2 1 2 converts the signal level of the differential transmission signal to multi-level (here, 8-level) digital data based on the training data transmitted prior to the transmission data. Determine the threshold for performing The determined threshold value is input to the data determination unit 210.
- the data determination unit 210 performs a predetermined data determination process to convert transmission data included in the differential transmission signal into data that can be processed by the upper layer data processing unit 13, that is, the predetermined data determination process. Perform decryption processing.
- the data determination unit 210 changes the decoding result according to the determination result by the polarity determination unit 211.
- the decoded data that is, the decoded transmission data, is output to the upper layer data processing unit 13.
- a device that transmits a differential transmission signal is referred to as a transmitting device
- a device that receives a differential transmission signal is referred to as a receiving device.
- this embodiment In this state, when the power of the network is turned on, the polarity of the connection is determined, and the polarity of the signal is inverted according to the determination result. Normal data transmission is performed regardless of the data insertion direction.
- the system according to the present embodiment constitutes a ring-type network. Therefore, when a connector is disconnected or a new device is added to the network, the network must be connected. The power of the network needs to be turned off.
- the polarity of the connector is determined when the power is turned on. As described above, this data transmission system always performs the judgment when it is necessary to judge the connector polarity (when the connector is unplugged, etc.). And can be.
- FIG. 6 is a flowchart showing a processing flow of the transmission device in the present embodiment.
- FIGS. 7 and 8 are flowcharts showing the flow of the processing of the receiving apparatus in the present embodiment.
- the operation of each device shown in FIGS. 6, 7 and 8 is started when the power of the network is turned on.
- the condition that the power of the network is turned on means that the power of all the devices included in the data transmission system is turned on. Means. It should be noted that any method may be used to control the power-on of all the devices that make up the network. For example, a device that controls the power supply of each device that composes the network is installed, and the device In this case, all devices may be powered on.
- the transmitting apparatus transmits the synchronization establishing signal including the synchronization establishing signal in the step S101 to transmit the synchronization establishing signal including the evening.
- the evening is a time for the receiving device to identify the polarity judging connector and to start judging the polarity of the connector.
- the synchronization establishment data is also used as initialization data transmitted to start the initialization processing performed in each device.
- the data for establishing synchronization has a predetermined constant pattern.
- the transmission processing unit 201 of the transmitting device transmits a synchronization establishing signal in response to the power being supplied to the transmitting device. Generate.
- the generated data for establishing synchronization is transmitted to the receiving device via the D / A comparator 202 LPF 203 and the driver 204. As described above, the processing in step S101 is performed.
- the transmitting device determines whether a predetermined time has elapsed (step S102).
- the predetermined time is set in advance so as to be equal to or longer than a time required for the receiving device that is the transmission destination of the synchronization establishment data to complete the establishment of the synchronization. If it is determined in step S102 that the predetermined time has not elapsed, the transmitting apparatus repeats the processing in step S101.
- the transmitting device transmits a polarity determination signal including polarity determination data, following the synchronization establishment signal (step S103). Concrete Then, the transmission processing unit 201 of the transmission device transmits polarity determination data having a predetermined fixed pattern in the same manner as the synchronization establishment data. The length of the polarity determination data is determined in advance.
- the transmitting device After transmitting the polarity determination signal for a predetermined length, the transmitting device transmits a training signal following the polarity determination signal (step S104).
- the training signal is used to set the threshold value for determining the multi-level (here, 8 levels) digital signal from the signal level of the differential transmission signal. It is. The evening and length of the training signal are predetermined.
- the method of transmitting the training signal is the same as that of the synchronization establishment data described above.
- the transmitting device first performs a transmission / reception signal including a transmitter following the training signal (step S104). Specifically, the transmission processing unit 201 of the transmission apparatus transmits a signal of a fixed pattern of the training signal, and then transmits a transmission signal input from the upper layer data processing unit 13. 7 is transmitted as a differential transmission signal.
- the transmission method is the same as that for synchronization establishment described above.
- the transmission processing unit 201 of the transmission device ends the processing shown in FIG. 6 by ending the transmission of the transmission data to be transmitted.
- the differential transmission signal composed of the synchronization establishment signal, the polarity determination signal, the training signal, and the transmission data signal is transmitted to the receiving Will be sent to
- the synchronization transmission is performed as a differential transmission signal from the transmitter.
- the activation signal is received. Therefore, when the power of the network is turned on, the receiving device first receives the signal for establishing synchronization (step S201).
- the synchronization establishment signal is input to the A / D converter 206 via the receiver 205.
- the input synchronization establishing signal is AZD-converted by an AZD converter 206, and the A / D-converted digital data is converted to a digital filter 207 and a timing reproduction unit 2 0 is input to 8.
- the receiving apparatus establishes synchronization based on the synchronization establishing signal input in step S201 (step S202).
- the synchronization establishment processing is performed by the timing reproducing unit 208. That is, the timing reproducing unit 208 determines timing (detection timing) for detecting the signal level transmitted after the synchronization establishing signal. The determination of the detection timing is performed by correcting the detection timing to the correct timing by performing the above-described detection timing correction processing. It is done.
- the timing reproducing unit 208 instructs the symbol data extracting unit 209 of the detection timing determined in step S202.
- step S203 determines whether or not the synchronization establishment processing has been completed. This processing is performed by the timing reproduction unit 208. The determination in step S203 is designed to be always completed before the predetermined time in step S102 has elapsed. If it is determined that the synchronization establishment processing has not been completed, the receiving apparatus performs the processing of step S201 again. On the other hand, if it is determined in step S203 that the synchronization establishment process has been completed, the receiving apparatus performs step S1.
- the polarity judgment signal transmitted from the transmitting device is received (step S204).
- the polarity determination signal is input to the AZD converter 206 through the receiver 205 of the receiving device.
- the input polarity determination signal is A / D-converted by A / D 3 channels and 206 overnight. Further, from the digital data of the polarity determination signal subjected to the A / D conversion, the symbol data is extracted by the symbol extraction unit 209.
- the receiving device detects the polarity of the connection (step S205).
- This processing is performed by the polarity determination unit 211. More specifically, the polarity determination unit 211 of the receiving apparatus inputs the polarity determination signal output from the symbol data extraction unit 209, and outputs the excitation transmission signal based on the input polarity determination signal. Detects whether the polarity of (polarity judgment signal) is inverted. As described above, it can be determined whether or not the polarity of the connector has been inverted, depending on whether or not the polarity of the differential transmission signal has been inverted.
- the value of the polarity determination data is a differential signal
- the level of the signal is the maximum, and there is a certain i, that is, the value of the polarity determination data is 102. It is determined that the polarity of the dynamic transmission signal is not inverted.
- FIG. 9 is a diagram schematically showing data output from the symbol extraction unit 209 shown in FIG.
- the vertical axis represents the magnitude of the digital value that is the output value of the symbol data extraction unit 209.
- the horizontal axis indicates the output time.
- the digital value output from the symbolic overnight extractor 209 is a 10-bit value, and the magnitude indicates the level of the differential transmission signal. That is, the output value of the symbol data extraction unit 209 indicates the level of the differential transmission signal by a numerical value from 1 to 124.
- the interval between the points on the polygonal line shown in FIG. 9 is the above-described time interval T.
- the polygonal line shown in FIG. 9 represents the waveform of the differential transmission signal by discrete numerical values.
- the above-described synchronization establishment data is being output. That is, the pattern in which the output values a and b are alternately output from the time t0 to the time t1 is a pattern indicating the data for establishing synchronization. Such a pattern is set in advance. Note that, from time t0 to t1, the processing of steps S201 to S203 is performed.
- the polarity determination data included in the polarity determination signal is being output. That is, from time t1 to time t2, the pattern from which the output value 1024 is continuously output is the pattern of the polarity determination data.
- the pattern of the polarity determination data is also determined in advance, similarly to the data for establishing synchronization.
- the polarity judgment data is a pattern in which the same value is continuous for three symbols. Note that, at the time t1 and the time t2, the processing of the steps S204 and S205 is performed. As described above, in the present embodiment, the polarity of the connector is determined based on the amplitude level of the differential transmission signal after the pattern of the data for establishing synchronization is completed. be able to
- Fig. 10 shows the case where the polarity of the fe transmission signal is inverted, and the symbol output from the symbol data extraction unit 209 shown in Fig. 3 is bright.
- FIG. 4 is a diagram schematically showing a value indicated by “de”.
- FIG. 10 shows a case in which a signal is received similarly to the case shown in FIG. 9 and the connection direction is opposite to that shown in FIG. 4 shows an output value of the symbol data extraction unit 209.
- the differential transmission signal transmitted by the receiver is a signal in which the polarity of the connector is inverted as compared with the positive polarity field. That is, the differential transmission signal received by the receiving device has a polarity, and the polarity changes according to the polarity of the connector.
- the value that can be considered as the polarity judgment data is 1 is 1.
- ⁇ ffi dynamic transmission It is determined that the signal polarity is inverted.
- whether or not the polarity of the dynamic transmission signal is inverted can be determined based on the value of the polarity determination data.
- the polarity determining section 2 1 1 is connected to determine whether or not the polarity of the differential transmission is inverted according to the value of the polarity determination data, that is, the direction of the connector is reversed. Is determined. Further, the polarity judgment 211 outputs a signal polarity flag indicating whether the polarity is inverted or not to the data determination unit 210.
- the receiving apparatus receives the treg signal transmitted from the transmitting apparatus in step S104 (Ste S206).
- Step S206 receives the treg signal transmitted from the transmitting apparatus in step S104 (Ste S206).
- Ren-205 to the symbol data extraction unit 2009
- the processing performed on the training signal in the same manner as in the polarity determination signal is performed.
- the receiving apparatus performs a training process using the training signal received in step S206 (step S207). This processing is performed by the training processing unit 2 12.
- the details of the training processing will be described.
- the training signal is being output from time t2 to t3.
- the training signal has a predetermined pattern. This pattern is determined so that the values of the eight-valued digital data take all the values (eight values) in a predetermined order.
- the training processing unit 212 stores the order of the eight digital values indicated by the pattern.
- the training processing unit 212 stores the value of the 10-bit digital data input from the symbol data extraction unit 209. These are stored in association with the eight digital values.
- the training processing unit 212 determines whether or not the training has been completed. Since the length of the training signal is determined in advance, the number of times of performing the processing in step S207 is also determined in advance. When the processing of step S207 is performed a predetermined number of times, the training processing unit 212 determines that the training has been completed. If it is determined that the training has not been completed, the process of step S207 is performed.
- the threshold value is a threshold value for converting the signal level of the differential transmission signal into 8-level digital data.
- FIG. 11 is a diagram for explaining an example of a threshold value calculating method.
- the possible range of the signal level (1 to 1024) is divided into eight levels from level A to level H according to the magnitude of the signal level.
- Levels A to D respectively correspond to four possible values (“00”, “01”, “10”, and “11”) that the eight digital values can take.
- the levels E to H correspond to possible values of the four digital values (“00”, “01”, “10”, and “11”), respectively.
- the training processing unit 212 stores in advance the value of the 10-bit digital data input from the symbolic overnight extraction unit 209 in step S207, and Set the threshold based on the 8 digital values and.
- the first threshold value that distinguishes between level A and level B is set as follows.
- the training processing section 212 sets the minimum value of the 10-bit digital data input as the value indicating the level A and the value indicating the level B.
- the average (intermediate value) of the maximum value and the maximum value of the input 10-bit digital data is set as the first threshold value.
- the second to seventh thresholds for distinguishing the other levels are set in the same manner as the above-mentioned first threshold.
- the first to seventh threshold values set as described above are input to the data determination unit 210.
- the receiving device receives the transmission data signal (step S210).
- the transmission data signal is being output after time t3.
- the data over time after time t 3 is decoded by the data over time determination section 210.
- the processing on the transmission 5-night signal from the receiver 205 to the symbol data extraction unit 209 is the same as the polarity determination signal.
- the receiving apparatus determines whether or not the polarity of the dynamic 1 transmission signal (transmission data overnight signal) is inverted (step S211).
- This processing is performed by the sunset determination unit 210.
- the data determination unit 210 determines whether or not the polarity of the differential transmission signal is inverted based on the signal polarity flag input from the polarity determination unit 211. judge .
- step S211 it is determined that the polarity of the differential transmission signal is inverted.
- step S2122 the receiver performs decoding for polarity inversion (step S2122).
- step S2123 the communication device performs normal decoding (step S2113).
- step S212 and step S213 is performed by the data determination section ⁇ 10 of the receiving apparatus.
- the operation of the data determination unit 210 will be described in detail.
- FIG. 12 is a block diagram showing a detailed configuration of the data determination unit 210 shown in FIG. In Fig.12, the data judgment unit
- the 210 includes a selection circuit 2101, a normal decoding circuit 210, and a polarity inversion decoding circuit 210.
- the selection circuit 2101 sets the AZ according to the content of the signal polarity flag input from the polarity determination unit 211. Selects which output signal from the D-comparator 206 is output to the normal decoding circuit 210 or the polarity inversion decoding circuit 210 The polarity of the dynamic transmission signal is inverted.
- the selection circuit 211 that has received the signal polarity flag indicating that the A / D converter is operating outputs the output signal from the A / D converter 206 to the polarity inversion decoding circuit 210 Output to.
- step S207 the polarity inversion decoding circuit 210 receives the output signal from the AZD converter 206 and decodes the transmission data that is the received output signal.
- the selector 2101 which has received the signal polarity flag indicating that the polarity of the differential is transmitted signal is not inverted, outputs the output signal from the AZD comparator 206 Output to the normal decoding circuit 210.
- the ordinary decoding circuit 210 receives the output signal from the A / D converter 206, and outputs the received output signal. ⁇ de-decrypt each.
- FIG. 13 is a diagram showing a correspondence relationship between conversions in two decoding circuits included in the header determination unit 210 shown in FIG. FIG. 13 (a) is a table showing the correspondence in the normal decoding circuit 2102, and FIG. 13 (b) is a table in the polarity inversion decoding circuit 2103. It is a table showing the relationship.
- each decoding circuit converts the 10-bit digital data output from the A / D converter 206 into a 2-bit digital data. It shall be converted in the evening. Therefore, in each conversion sample shown in Fig. 13, the 10-bit digital value (value indicating the level of the differential transmission signal) output from the AZD converter 206 is used.
- the conversion table is created so as to have a value obtained by inverting the polarity in one of the conversion tables, that is, the normal decoding circuit 210 and the polarity inversion decoding circuit 210 Is designed so that the polarities of the differential transmission signals corresponding to the output data are inverted to each other.
- the decoding performed by using the decoding circuit for normal use is the same as the decoding performed by using the decoding circuit for reversing the polarity of the signal. This is what happens.
- step S212 or S213 When the processing in step S212 or S213 described above ends, the receiving apparatus ends the processing.
- the decrypted data decrypted in step S212 or S213 is sent to CPU 14 via upper layer data processing section 13.
- the synchronization-establishing data indicates that the waveform of the differential transmission signal to which the synchronization-establishing data is added has a positive or reverse connector polarity. Regardless, it is preset to include a waveform pattern that will result in the same waveform. That is, as shown in FIG. 9, the synchronization establishing terminal includes a pattern in which a and b are alternately output as output values. In this pattern, the connector is the positive The patterns are the same when they are connected to each other and when they are connected so that they have opposite polarities. Therefore, if the receiving device detects the synchronization establishment data based on the pattern, the receiving device can surely detect the synchronization establishment data.
- FIG. 14 is a flowchart showing the flow of processing of the receiving device in the second embodiment.
- the difference between the present embodiment and the first embodiment is the processing of steps S301 and S302. Therefore, the description of the processing from step S201 to S211 will be omitted. If it is determined in step S211 that the polarity of the differential transmission signal is inverted, the receiver reverses the polarity of the differential transmission signal (step S3).
- step S 302 the processing in step S 302 is performed.
- the receiving apparatus performs the processing in step S302 without performing the processing in step S301.
- the operation of the data determination unit 210 will be described in detail.
- FIG. 15 is a block diagram illustrating a detailed configuration of the data determination unit 210 according to the second embodiment.
- the data determination unit 210 includes a selection circuit 210, a polarity inversion circuit 210, and a normal decoding circuit 21086.
- the selection circuit 2104 In accordance with the content of the signal polarity flag input from
- ADn member Selects which of the output signal from the receiver 206 is output to the polarity inverting circuit 210 and the decoder 208 for normal use.
- the polarity of the differential transmission signal is inverted.3 ⁇ 4:
- the selection circuit 210 that receives the signal polarity flag indicates that the output signal from the A / D 3 Polarity inversion circuit
- the polarity inversion circuit 210 inverts the polarity of the input differential transmission signal indicating 13 ⁇ 4 (Step S30) o
- FIG. 16 is a diagram schematically showing the polarity reversal processing in the polarity inversion circuit 210 shown in FIG.
- the polarity reversing circuit 210 is set so that the input value is set so as to be axisymmetric with respect to the median value (5 1 2) of the possible input values (1 to 1024). Convert to. For example, as shown in Fig. 16, when the input value from the AD3 member is set to 700 (point D) in the polarity inversion circuit 210, the polarity inversion circuit 210 The value is converted to 324 (point D,) and output to the normal decoding circuit 2086. By the above-described transformation, the polarity inversion circuit 210 can invert the polarity of the differential 13 ⁇ 4 ⁇ signal.
- the selection circuit 210 that has received the signal polarity flag indicating that the polarity of the dynamic transmission signal is not inverted, normally outputs the output signal from the AZD converter 206.
- the normal decoding circuit 2086 receives the output from the A / D converter 206 or the polarity inverting circuit 210, and decodes the received 1 ⁇ 1 data. (Step
- a 10-bit digital image is converted to a 2-bit digital image (decoded data).
- step S302 When the processing in step S302 described above ends, the receiving device ends the processing.
- the decoded data decoded in step S302 is sent to CPU 14 via upper layer data processing unit 13
- the polarity of the connector is determined using the polarity determination data, and the polarity of the differential signal is determined based on the determination result.
- the processing performed on the differential transmission signal is not limited to the above.
- the processing to be performed on the differential transmission signal depends on whether the connection relation of the connector 11 to the twisted pair cable is determined to be positive polarity or reverse polarity. This is to change whether the differential transmission signal received by the connector 11 is treated as a signal with normal polarity or as a signal with inverted polarity. Okay
- the polarity of the connector is determined using the polarity determination data when the power is turned on. Therefore, the polarity of the connector is determined when the power is turned on. In this case, it is necessary to memorize the judgment result.
- the present data transmission system includes a storage unit for storing the polarity of the connector determined at power-on.
- the polarity determination data is always added before the transmission data, and the polarity of the connector is determined each time the transmission data is transmitted. Is also good.
- the polarity determination data may be always added, and the receiving device may determine the polarity of the connector only when necessary. For example, if the receiving device has a function of detecting the disconnection of the connector, the polarity of the connector may be determined every time the detection of the disconnection of the connector is performed. Good.
- the differential transmission signal is A / D converted and then inverted.
- the differential transmission signal may be inverted using an analog circuit before AZD conversion.
- the polarity may be inverted after the decryption data is generated.
- a conversion circuit for converting two-bit digital data generated as a decoded data is prepared, and the conversion circuit according to the signal polarity flag is used. You may convert the digital value.
- the conversion circuit is designed to convert the decoded data into a decoded data generated when the polarity of the differential transmission signal is inverted.
- the output value includes a turn in which “a” and “b” are alternately output, so that the receiving apparatus can be surely provided.
- the data for establishing synchronization may be any data having a predetermined pattern.
- the receiving apparatus may store a predetermined pattern and a pattern when the polarity of the differential transmission signal including the pattern is inverted. I like it. Then, the receiving device detects the differential transmission signal corresponding to one of the two patterns stored in advance, and starts the polarity determination. According to the above method, the receiving apparatus can surely detect the synchronization establishment data.
- the level value of the signal at each symbol is read, and the value is converted to a 2-bit digital value.
- the method of converting to a 2-bit digital value is not limited to the above.For example, a difference between a symbol and a previous symbol is read, and the difference is read as a 2-bit digital value. You may convert it to.
- the data determination unit determines the value of the input signal level (corresponding to 10-bit digital data in the above embodiment) and the input at the preceding timing. Data judgment (conversion to 2-bit digital data) is performed using the difference value between the signal level value.
- the data transmission system of the present invention can be used for the purpose of performing normal transmission irrespective of the connection direction of the connection. .
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- Engineering & Computer Science (AREA)
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- Spectroscopy & Molecular Physics (AREA)
- Dc Digital Transmission (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004510200A JPWO2003103244A1 (ja) | 2002-05-31 | 2003-05-30 | データ伝送システム |
KR10-2004-7007425A KR20050002808A (ko) | 2002-05-31 | 2003-05-30 | 데이터 전송 시스템 |
EP03730705A EP1511253A1 (en) | 2002-05-31 | 2003-05-30 | Data transmission system |
US10/493,499 US7286616B2 (en) | 2002-05-31 | 2003-05-30 | Data transmission system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002159715 | 2002-05-31 | ||
JP2002-159715 | 2002-05-31 |
Publications (1)
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WO2003103244A1 true WO2003103244A1 (ja) | 2003-12-11 |
Family
ID=29706524
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/006806 WO2003103244A1 (ja) | 2002-05-31 | 2003-05-30 | データ伝送システム |
Country Status (6)
Country | Link |
---|---|
US (1) | US7286616B2 (ja) |
EP (1) | EP1511253A1 (ja) |
JP (1) | JPWO2003103244A1 (ja) |
KR (1) | KR20050002808A (ja) |
CN (1) | CN1596529A (ja) |
WO (1) | WO2003103244A1 (ja) |
Cited By (5)
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JP6226211B1 (ja) * | 2016-06-30 | 2017-11-08 | パナソニックIpマネジメント株式会社 | ドアホンシステムおよびその通信方法 |
JP2017229072A (ja) * | 2017-06-27 | 2017-12-28 | パナソニックIpマネジメント株式会社 | ドアホンシステムおよび通信方法 |
JP2017229071A (ja) * | 2017-06-27 | 2017-12-28 | パナソニックIpマネジメント株式会社 | ドアホンシステムおよび通信方法 |
JP2018011114A (ja) * | 2016-07-11 | 2018-01-18 | パナソニックIpマネジメント株式会社 | ドアホンシステムおよびその通信方法 |
US10284357B2 (en) | 2015-11-10 | 2019-05-07 | Panasonic Intellectual Property Management Co., Ltd. | Intercom system and communication method thereof |
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US7346786B1 (en) * | 2003-10-02 | 2008-03-18 | Autonomic Networks, Inc. | System for providing different polarities of power supplied over ethernet cables |
US7370635B2 (en) * | 2006-01-20 | 2008-05-13 | Caterpillar Inc. | System and method for resolving electrical leads |
US7392790B2 (en) * | 2006-01-20 | 2008-07-01 | Caterpillar Inc. | System and method for resolving crossed electrical leads |
GB0702626D0 (en) * | 2007-02-09 | 2007-03-21 | Texas Instruments Ltd | Cross-Over Compensation By Selective Inversion |
JP4683093B2 (ja) * | 2008-08-29 | 2011-05-11 | ソニー株式会社 | 情報処理装置、信号伝送方法、及び復号方法 |
JP2011071852A (ja) * | 2009-09-28 | 2011-04-07 | Fujitsu Ltd | 伝送システムおよび伝送方法 |
EP3048536B1 (en) * | 2011-10-05 | 2020-02-19 | Analog Devices, Inc. | Two-wire communication system for high-speed data and power distribution |
US10649948B2 (en) | 2011-10-05 | 2020-05-12 | Analog Devices, Inc. | Two-wire communication systems and applications |
CN113434346B (zh) * | 2021-05-26 | 2023-08-04 | 成都天奥信息科技有限公司 | 一种差分信号极性连接的自动检测方法及系统 |
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- 2003-05-30 JP JP2004510200A patent/JPWO2003103244A1/ja not_active Withdrawn
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Also Published As
Publication number | Publication date |
---|---|
JPWO2003103244A1 (ja) | 2005-10-06 |
US7286616B2 (en) | 2007-10-23 |
EP1511253A1 (en) | 2005-03-02 |
CN1596529A (zh) | 2005-03-16 |
KR20050002808A (ko) | 2005-01-10 |
US20050030934A1 (en) | 2005-02-10 |
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