JP4923124B2 - Data transmission apparatus and data transmission system - Google Patents

Description

  The present invention relates to a data transmission apparatus and a data transmission system that transmit data via a transmission line, and more particularly to a data transmission apparatus and a data transmission system that can change the number of lanes in the transmission line.

  In recent years, in the field of transmitting data over a long distance, an increase in transmission speed in a method of transmitting data via a single transmission channel (or lane) has reached a peak. Accordingly, in order to improve the communication band, a technique (lane coupling, multi-lane skew correction) that bundles a plurality of lanes to be viewed as one link has been developed (see, for example, Patent Document 1 and Non-Patent Document 1). .

  Patent Document 1 describes a transmission method using a plurality of lanes. In a transmission method using multilanes, correction of a difference in transmission distance between lanes, or in a transmission method using optical transmission, correction of arrival time difference (hereinafter referred to as skew) of data caused by a difference in optical wavelength of each lane becomes a problem. Further, it is necessary to change the number of lanes according to the transmission medium. In Patent Document 1, a data string is divided into a plurality of virtual lanes in units of code blocks, and the transmission lane is corrected while correcting the skew between lanes every time the number of lanes is converted in the repeater, while maintaining the transmission capacity constant. The number of can be changed.

  Non-Patent Document 1 describes a transmission method using a plurality of lanes as a standardized technology of 100 Gigabit Ethernet (registered trademark). In 100 Gigabit Ethernet (registered trademark), there is a description regarding multi-lane transmission that realizes a transmission rate of 100 Gbps by bundling 20 lanes of data of 5 Gbps virtual lanes. In a transmission method using multilanes, correction of a difference in transmission distance between lanes, or in a transmission method using optical transmission, correction of arrival time difference (hereinafter referred to as skew) of data caused by a difference in optical wavelength of each lane becomes a problem. Further, it is necessary to change the number of lanes according to the transmission medium. In 100 Gigabit Ethernet (registered trademark), a data string of 100 Gbps is divided into 20 virtual lanes in code block units, and the 20 virtual lanes are multiplexed / divided in bit units, so that the transmission capacity is constant. The number of transmission lanes can be changed.

JP 2006-253852 A

IEEE P802.3ba, Clause 82, “Physical Coding Suber (PCS) for 64B / 66B, type 40GBASE-R and 100GBASE-R”

  However, Patent Document 1 and Non-Patent Document 1 indicate that when a failure occurs in a part of lanes, it is considered that the entire link is broken and the entire link is disconnected. In this case, a rapid decrease in transmission efficiency is unavoidable, and it becomes difficult to achieve high fault tolerance. In Patent Document 1 and Non-Patent Document 1, when a lane stopped due to a failure is recovered from the failure, the lane cannot be restored unless the entire link is reconstructed. That is, it does not support switching that dynamically increases the number of lanes. Furthermore, if there is an error in the switching control of the number of lanes, the link is disconnected, so that high reliability is required for the switching control. However, in Patent Document 1 and Non-Patent Document 1, the reliability of switching control is increased. The technology is not described.

  Accordingly, one of the objects of the present invention is to provide a data transmission apparatus and a data transmission system capable of realizing improved fault tolerance in multilane transmission in which the number of lanes can be changed. Another object of the present invention is to provide a data transmission apparatus and a data transmission system capable of improving reliability in multilane transmission in which the number of lanes can be changed. The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

  Of the inventions disclosed in the present application, the outline of a typical embodiment will be briefly described as follows.

  The data transmission system according to the present embodiment includes a first transmitter, a first receiver, N first transmission lanes serving as communication paths from the first transmitter to the first receiver, and a first reception. First communication means serving as a communication path from the transmitter to the first transmitter. Here, the first transmitter outputs predetermined transmission data to the first receiver for the normal lanes of the N first transmission lanes based on the failure lane information, and the N first First means for outputting a specific first data pattern to a first receiver targeting a fault lane in the transmission lane is provided. The first receiver monitors the reception state of the transmission data transmitted through the normal lane, determines whether the reception state is normal, and the first receiver transmitted through the fault lane. And a third means for monitoring the reception state of one data pattern and determining whether or not the reception state is normal. Then, one of the first receiver and the first transmitter updates the position of the normal lane and the position of the faulty lane based on the determination result of the second means and the determination result of the third means. It is characterized by generating the above-described fault lane information in reflection.

  With such a configuration, when a failure occurs, communication is continued using a normal lane other than the failure lane, and when the failure is recovered, communication is performed by adding the lane to the normal lane. The communication capacity can be expanded while sustaining. This makes it possible to achieve high fault tolerance.

  Of the inventions disclosed in this application, the outline of a typical embodiment will be briefly described. In multilane transmission in which the number of lanes can be changed, improvement in fault tolerance can be realized.

In the data transmission system by Embodiment 1 of this invention, it is a block diagram which shows an example of the structure. FIG. 2 is a block diagram illustrating a detailed configuration example of the transmitter in the data transmission system of FIG. 1. FIG. 2 is a block diagram illustrating a detailed configuration example of the receiver in the data transmission system of FIG. 1. FIG. 4 is a circuit diagram illustrating a detailed configuration example of a PRBS generation unit in FIG. 2 and a PRBS inspection unit in FIG. 3. In the data transmission system of FIG. 1, it is explanatory drawing which shows an example of the main processing content. It is a block diagram which shows the detailed structural example of the receiver contained in the data transmission system by Embodiment 2 of this invention. In the data transmission system by Embodiment 3 of this invention, it is explanatory drawing which shows an example of the main processing content.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.

(Embodiment 1)
FIG. 1 is a block diagram showing an example of the configuration of a data transmission system according to Embodiment 1 of the present invention. The data transmission system shown in FIG. 1 includes two transceivers (data transmission apparatuses) 3-1 and 3-2 each including a transmitter 1 and a receiver 2. The transmitter 1 of the transmitter / receiver 3-1 is connected to the receiver 2 of the transmitter / receiver 3-2 via a plurality of (here, x) transmission lanes LN 1, and the transmitter 1 of the transmitter / receiver 3-2 is a plurality of transmitters 1. It is connected to the receiver 2 of the transceiver 3-1 via (here x number) transmission lanes LN2. The x transmission lanes are configured to be bundled together, so that they are handled as one transmission path in appearance (conceptually).

  In this data transmission system, transmission lanes LN1, LN2 in opposite directions and notifications (failure lane notification and use lane notification) from the receiver 2 to the transmitter 1 in each of the transceivers 3-1, 3-2 are sent. The number (m (≦ x)) of transmission lanes used in the transmission lanes LN1 and LN2 is determined. A transmission data frame (hereinafter referred to as transmission data) transmitted to the receiver 2 is input to the transmitter 1. Based on the notification from the receiver 2 described above, the transmitter 1 divides the input transmission data into m transmission lanes LN and outputs the divided transmission data. The receiver 2 receives the transmission data from the transmitter 1 described above via m transmission lanes LN. The receiver 2 outputs the input data as a reception data frame (hereinafter referred to as reception data). The receiver 2 monitors the state of x transmission lanes LN, details of which will be described later. The number (m) of the transmission lanes LN described above is determined using this monitoring result.

  FIG. 5 is an explanatory diagram showing an example of main processing contents in the data transmission system of FIG. First, the receiver 2 in the transceiver 3-1 monitors the state of the x transmission lanes LN2, and requests the transmitter 1 in the transceiver 3-1 to transfer the result via the fault lane notification ( S501). This failure lane notification includes information on the transmission lane in which the failure has occurred and information on the transmission lane that has recovered from the failure among the x transmission lanes LN2. The transmitter 1 that has received this failure lane notification embeds the failure lane information indicated by the failure lane notification in the alignment marker and transfers it to the receiver 2 in the transceiver 3-2 via the transmission lane LN1 (S502).

  The receiver 2 that has received the alignment marker extracts fault lane information from the alignment marker (S503). Here, it is determined whether or not the extracted failure lane information is unanimous (S504). If unanimity coincides, this failure lane information is used as lane information, and used in the transceiver 3-2 via the lane notification. The transmitter 1 is notified (S505). Here, in S502 described above, the alignment marker having the same content is transmitted through all the transmission lanes LN1 that are currently used. In S504, it is determined whether or not the alignment markers in each transmission lane LN1 are all the same. The This can reduce the probability of erroneous lane switching.

  The transmitter 1 in the transceiver 3-2 that has received the use lane notification compares the currently set use lane information with the use lane information indicated by the use lane notification, and determines whether there is a change ( S506). When there is a change, the transmitter 1 updates the current setting with the used lane information indicated by the used lane notification, and transmits transmission data as necessary so that the communication capacity according to the number of used lanes is obtained in the MAC layer. Is processed (S507). That is, in some cases, transmission data including idle data (empty data) is generated. Further, the transmitter 1 distributes transmission data for transmission lanes based on the updated use lane information in the physical layer (S508), embeds the updated use lane information in the alignment marker, and sets the transmission lane LN2 Then, the data is transmitted to the receiver 2 in the transceiver 3-1 (S509). Receiving the alignment marker, the receiver 2 extracts the use lane information from the alignment marker, determines whether it is unanimous like S504 (S510, S511), and decodes the transmission lane LN2 corresponding to the use lane information. Switching is performed so as to perform conversion or the like (S512).

  As described above, in the data transmission system according to the present embodiment, the receiver 2 sequentially monitors the failure of the transmission lane LN and the recovery from the failure, and when a failure occurs, the normal lane other than the failure lane. When the communication is continued using and is restored from the failure, the communication capacity is expanded while continuing the communication by adding the lane to the normal lane. This makes it possible to achieve high fault tolerance. Hereinafter, detailed contents of the transmitter 1 and the receiver 2 for realizing such a function will be described.

  FIG. 2 is a block diagram showing a detailed configuration example of the transmitter 1 in the data transmission system of FIG. The transmitter 1 (data transfer device) shown in FIG. 2 includes a frame buffer 4, a capacity conversion unit 5, a transmission encoding unit 6, a round robin unit 7, a marker insertion unit 8 (8-1 to 8-p), and marker management. Unit 9, a PRBS generation unit 10, a selector unit 11 (11-1 to 11-p), a multiplexer unit 12, and a failure management unit 13.

  First, the data flow of the transmitter 1 will be described. The transmission data is input to the frame buffer 4. Further, a data string from the receiver 2 is input to the marker management unit 9 and the failure management unit 13. The frame buffer 4 outputs a data string to the output source of transmission data and the capacity converter 5 respectively. The capacity converter 5 outputs the data strings to the frame buffer 4 and the transmission encoder 6 respectively. The transmission encoding unit 6 outputs the data string to the round robin unit 7.

  The round robin unit 7 outputs a data string to the marker insertion unit (8-1 to 8-p). The marker insertion unit (8-1 to 8-p) outputs a data string to the p selector units (11-1 to 11-p). The PRBS generation unit 10 outputs a data string to the p selector units (11-1 to 11-p). The failure management unit 13 outputs the data string to the p selector units (11-1 to 11-p) via the p output units, and the capacity conversion unit 5, the round robin unit 7, and the marker management unit. The data string is output to 9 respectively. Each of the p selector units (11-1 to 11-p) outputs a data string to the multiplexer unit 12. The multiplexer unit 12 outputs a data string to x transmission lanes LN.

  Next, a detailed operation example of each part of the transmitter 1 will be described. The failure management unit 13 receives the used lane notification from the receiver 2 and compares it with the currently used lane information to determine whether there is a change. When there is a change, the failure management unit 13 notifies the capacity conversion unit 5, the round robin unit 7, the marker management unit 9, and the selector unit (11-1 to 11-p) to that effect. As a result, the processing of S506 in FIG. 5 becomes possible. On the other hand, transmission data is input to the frame buffer 4. Here, the frame buffer 4 transmits a buffer amount notification to the transmission source of the transmission data according to the buffer amount of the data accumulated in the frame buffer 4. The transmission source of transmission data stops transmission of transmission data based on the received buffer amount notification. The frame buffer 4 receives the read request from the capacity converter 5 and outputs transmission data.

  The capacity conversion unit 5 calculates a transmission capacity that can be transmitted using a lane that can be used on the transmission lane LN, based on the use lane information from the failure management unit 13 described above. For example, the transmission capacity that can be transmitted can be calculated by multiplying the transmission capacity that can be transmitted in one lane by the number of usable lanes. Here, the capacity converter 5 controls the reading of the frame buffer 4 by using a transmission data read request so that the capacity of the transmission data output from the frame buffer 4 is equal to the calculated transmission capacity. As a result, the processing of S507 in FIG. 5 becomes possible.

  The transmission encoding unit 6 converts the data sequence of the transmission data input from the capacity conversion unit 5 into a transmission code (for example, 64B / 66B code), and outputs the transmission data to the round robin unit 7. The type of transmission code is not particularly limited, and may be other than 64B / 66B code. The round robin unit 7 cyclically allocates transmission data to normal virtual lanes among the p virtual lanes based on the used lane information from the failure management unit 13. At this time, optimally, the code block of the data encoded by the transmission encoding unit 6 (66-bit data string in the case of 64B / 66B code) is distributed in units.

  Here, p paths from the output of the round robin unit 7 to the input of the multiplexer unit 12 are referred to as virtual lanes, and x paths from the output of the multiplexer unit 12 are referred to as transmission lanes (physical lanes) LN. Call. In multi-lane transmission, transmission data is distributed to p (for example, 20) virtual lanes, and then multiplexed to x (for example, 10) transmission lanes LN via the multiplexer unit 12. In some cases, further multiplexing may be performed further by changing the wavelength of the optical transmission signal for each transmission lane. Here, the correspondence relationship between the p virtual lanes and the x transmission lanes LN is such that, for example, two of the p lanes are multiplexed into one of the x through the multiplexer. The failure management unit 13 has grasped this correspondence. Therefore, a failure in a certain transmission lane can be regarded as a failure in the corresponding virtual lane, and the above-mentioned failure lane information and used lane information are information based on the virtual lane even if the information is based on the transmission lane. There may be.

  The transmission data divided into virtual lanes and transmitted simultaneously are received by the receiver 2 with arrival time differences (skews) caused by differences in transmission times in the transmission lanes LN. Therefore, the marker insertion unit 8 (8-1 to 8-p) inserts an alignment marker that enables the receiver 2 to detect the skew for each virtual lane in the data string of the transmission data. Furthermore, the marker insertion unit 8 (8-1 to 8-p) inserts an alignment marker representing failure lane information and use lane information into a data string of transmission data. Here, the marker management unit 9 receives the failure lane notification from the receiver 2 and the use lane notification from the failure management unit 13 and selects between the failure lane information based on the failure lane notification or the use lane information based on the use lane notification. And output to the marker insertion unit 8 (8-1 to 8-p). The marker insertion unit 8 (8-1 to 8-p) inserts the selected information as an alignment marker. As a result, the processing of S502 and S509 of FIG. 5 can be performed.

  The PRBS generation unit 10 generates a pseudo random bit string in which DC balance and finite run length are ensured, and outputs the bit string to p selector units (11-1 to 11-p). As a result, malfunction of the receiver 2 to which the data string from the virtual lane where the failure has occurred can be avoided. Although details will be described with reference to FIGS. 3 and 4, the receiver 2 can detect recovery from a failure in the virtual lane (transmission lane) by detecting a specific pseudo-random bit string. Here, for example, in the case of the bit string composed of “0” and “1”, the pseudo random bit string in which the DC balance and the finite run length are guaranteed is a data string received at a predetermined time interval. It is a bit string in which the numbers of “0” and “1” included are the same.

  Based on the used lane information from the failure management unit 13, the p selector units (11-1 to 11-p) are marker insertion units (8-1 to 8-p) if the lane is in a normal state. If the lane is in an abnormal state, the random bit string input from the PRBS generation unit 10 is selected and output to the multiplexer unit 12. The multiplexer unit 12 multiplexes the data sequence output from the p selector units (11-1 to 11-p) into the number of transmission lanes (x), and the multiplexed data sequence is transmitted to the transmission lane LN. Output. The processing of S508 in FIG. 5 can be performed by the virtual lane division processing from the round robin unit 7 to the multiplexer unit 12.

  Next, an example of the alignment marker inserted in the marker insertion unit 8 will be described. In this embodiment, a 66-bit fixed pattern is defined as the alignment marker to be inserted, and the marker insertion unit (8-1 to 8-p) displays the alignment marker and lane state of the 100 Giga Ethernet (registered trademark) standard. Insert the marker to represent into the data string at regular intervals. The 100 Giga Ethernet (registered trademark) standard alignment marker has 66 bits of which 2 bits are header information, 24 bits are alignment information, and 8 bits are parity information (error detection code) for BER (bit error rate) measurement. The remaining 32 bits are used as an inverted value of the alignment information and an inverted value of the parity information for BER measurement.

  FIG. 3 is a block diagram showing a detailed configuration example of the receiver 2 in the data transmission system of FIG. The receiver 2 (data transfer apparatus) shown in FIG. 3 receives a data string from x transmission lanes LN, and outputs received frame data (hereinafter, received data), used lane information, and fault lane information. The receiver 2 includes a signal detection unit (14-1 to 14-x), a PRBS inspection unit (15-1 to 15-x), a PRBS monitoring unit 16, a demultiplexer unit 17, a block synchronization unit (18-1 to 18). -P), BER inspection unit (19-1 to 19-p), BER monitoring unit 20, lane determining unit 21, marker inspection unit (22-1 to 22-p), marker monitoring unit 23, phase difference detection unit 24, a deskew unit 25, a marker deletion unit 26, a transmission decoding unit 27, and a capacity conversion unit 28.

  First, the data flow of the receiver 2 will be described. The data strings output from the transmitter 1 via the transmission lane LN are respectively input to the signal detection units (14-1 to 14-x). The signal detection units (14-1 to 14 -x) output the data string to the demultiplexer unit 17. The demultiplexer unit 17 includes p PRBS checking units (15-1 to 15-x) and p block synchronization units (18-1 to 18-) from the p output units included in the demultiplexer unit 17, respectively. Output the data string to p).

  The PRBS inspection unit (15-1 to 15-x) outputs the data string to the PRBS monitoring unit 16. The PRBS monitoring unit 16 outputs the data string to the use lane determining unit 21. The block synchronization unit (18-1 to 18-p) sends the data string to the BER inspection unit (19-1 to 19-p), the marker inspection unit (22-1 to 22-p), and the deskew unit 25. Output. The BER inspection units (19-1 to 19-p) each output a data string to the BER monitoring unit 20. The BER monitoring unit 20 outputs a data string to the use lane determining unit 21. The use lane determination unit 21 outputs a data string to the transmitter 1 and the marker monitoring unit 23. The marker inspection unit (22-1 to 22-p) outputs a data string to the marker monitoring unit 23 and the phase difference detection unit 24.

  The marker monitoring unit 23 outputs a data string to the capacity conversion unit 28 and the transmitter 1. The phase difference detection unit 24 outputs the data string to the deskew unit 25. The deskew unit 25 outputs the data string to the marker deletion unit 26 via p output units included in the deskew unit 25. The marker deletion unit 26 outputs the data string to the transmission decoding unit 27. The transmission decoding unit 27 outputs the data string to the capacity conversion unit 28. The capacity converter 28 finally outputs the received data.

  In the receiver 2, as in the case of the transmitter 1, x paths to the input of the demultiplexer unit 17 are referred to as transmission lanes (physical lanes), and p routes from the output of the demultiplexer unit 17. The route is called a virtual lane.

  Next, the operation of the receiver 2 will be described in detail. The transmission data string transmitted from the transmitter 1 is input to a plurality of signal detection units (14-1 to 14-x) provided in the receiver 2 via the transmission lane LN. The signal detection units (14-1 to 14-x) execute clock synchronization processing of the data sequence and output the received data sequence to the demultiplexer unit 17. The demultiplexer unit 17 receives a data string from the signal detectors (14-1 to 14-x), separates the input data string into p virtual lanes, and separates the separated data string into a PRBS inspection unit (15-1 to 15-x) and the block synchronization unit (18-1 to 18-p).

  The PRBS inspection units (15-1 to 15-x) detect PRBS (pseudo random bit sequence) in the received data sequence and notify the PRBS monitoring unit 16 of the detection result. The PRBS monitoring unit 16 monitors the detection results notified from the PRBS inspection units (15-1 to 15-x), and targets stopped lanes in p virtual lanes (in other words, x transmission lanes). Then, the use lane determining unit 21 is notified of whether or not it is possible to recover from the failure. That is, as described in FIG. 2, a predetermined pseudo-random bit string is output from the PRBS generation unit 10 to the stopped lane, and the PRBS check unit (15-1 to 15-x) outputs the pseudo-random bit sequence. -The reception status of the bit string is grasped and notified to the PRBS monitoring unit 16. If there is no problem in the reception status, the lane is set as a failure recovery lane. Details of PRBS will be described with reference to FIG.

  The block synchronization unit (18-1 to 18-p) synchronizes with the code block of the transmission data encoded by the transmission encoding unit 6 in the transmitter 1 of FIG. 2, aligns the code block for each virtual lane, The data strings of the aligned code blocks are output to the BER inspection unit (19-1 to 19-p), the marker inspection unit (22-1 to 22-p), and the deskew unit 25, respectively. The BER checking unit (19-1 to 19-p) detects parity information for BER measurement from the data sequence output from the block synchronization unit (18-1 to 18-p), calculates a bit error rate, The BER monitoring unit 20 is notified. The BER monitoring unit 20 monitors the bit error rate notified from the BER checking unit (19-1 to 19-p), and when there is a virtual lane whose bit error rate is higher than a predetermined value, the virtual lane ( In other words, the transmission lane) is notified to the use lane determination unit 21 as an unusable lane.

  The use lane determining unit 21 receives information on the unusable lane from the BER monitoring unit 20 and information on the failure recovery lane from the PRBS monitoring unit 16, and based on these pieces of information, the failure lane toward the transmitter 1 Make a notification. That is, the fault lane notification includes information on the latest lane that can be used at the present time (in other words, information on a lane in which a fault continues at the present time). Thus, the above-described processing of S501 in FIG. 5 is performed, and a notification for avoiding a virtual lane (in other words, a transmission lane) whose reliability has been significantly reduced can be given, and a transmission lane (in other words, a virtual lane) recovered from a failure can be provided. ) Can be used for notification.

  The marker inspection unit (22-1 to 22-p) inspects the alignment marker, and extracts the used lane information and the fault lane information inserted by the marker insertion unit (8-1 to 8-p) of the transmitter 1. The extracted information is notified to the marker monitoring unit 23. Further, the marker inspection unit (22-1 to 22-p) notifies the phase difference detection unit 24 of the virtual lane number and the detection timing. The marker monitoring unit 23 monitors the use lane information notified from the marker inspection unit (22-1 to 22-p), detects that the transmission capacity has been changed in the transmitter 1 from the result, and transmits the transmitter. 1 determines the number of virtual lanes currently used, that is, the transmission capacity, and notifies the capacity conversion unit 28 of information on the transmission capacity. Thereby, the processing of S510 to S512 of FIG. 5 can be realized. Further, the marker monitoring unit 23 monitors the fault lane information notified from the marker inspection unit (22-1 to 22-p), and derives the use lane information from the result to use the lane for the transmitter 1. Output a notification. As a result, the processing of S503 to S505 in FIG. 5 can be realized.

  The phase difference detection unit 24, based on the virtual lane number and the detection timing notified from the marker inspection unit (22-1 to 22-p), the phase difference between the virtual lanes, that is, the skew amount and the reception position of the virtual lane. Is identified and notified to the deskew unit 25. The deskew unit 25 corrects the arrival time difference for each virtual lane and the received position shift based on the skew amount notified from the phase difference detection unit 24 and the reception position of the virtual lane, and sends it to the marker deletion unit 26. Output the received data string in the correct virtual lane order. The marker deletion unit 26 deletes the alignment marker inserted in the data sequence by the marker insertion unit (8-1 to 8-p) of the transmitter 1 and outputs the received data sequence to the transmission decoding unit 27.

  The transmission decoding unit 27 decodes the data sequence transmission-encoded by the transmission encoding unit 6 of the transmitter 1 into the original data sequence, and outputs the received data sequence to the capacity conversion unit 28. The capacity conversion unit 28 combines a data sequence transmitted through the virtual lane in use according to the transmission capacity determined by the marker monitoring unit 23, and expands the invalid signal interval between the data frames. The data is converted into a data string having the maximum transmission capacity of the transmission lane, and the received frame data is output.

  Next, an example of a failure lane return determination method will be described. 4 is a circuit diagram showing a detailed configuration example of the PRBS generation unit 10 in FIG. 2 and the PRBS inspection unit 15 in FIG. As shown in FIG. 4, the PRBS generation unit 10 performs DC DC by a scrambler having taps at a plurality of stages (here, 31 stages) of shift registers (S0 to S30) and specific positions (here S27 and S30). A pseudo random bit string in which balance and finite run length are guaranteed is generated and transmitted to the fault lane. On the other hand, the PRBS inspection unit 15 (15-1 to 15-x) uses a descrambler provided with a shift register having the same number of stages as the PRBS generation unit 10, taps at the same position, and an EXOR circuit 40 for comparison determination. , A pseudo-random bit string is detected.

  In such a configuration example, for example, at time t = t0, the PRBS generation unit 10 outputs a logical value 'A'. Similarly, at t = t0, the logical value 'A' is input to the PRBS inspection unit 15. To do. Then, for example, at time t = t31, the PRBS generating unit 10 outputs a logical value 'B' obtained by converting the logical value 'A' through a tap at a specific position, and this logical value 'B' is output as the PRBS checking unit 15. Is input to one of the two inputs in the EXOR circuit 40. Here, at t = t31, the logical value 'A' input to the PRBS checking unit 15 at t = t0 is the tap (PRBS) at a specific position in the PRBS checking unit 15 at the other of the two inputs in the EXOR circuit 40. Therefore, the logical value 'B' is input. Therefore, the PRBS inspection unit 15 (15-1 to 15-x) outputs all 0s when a pattern that matches the pattern sent out by the PRBS generation unit 10 is input, and partially outputs a pattern that does not match. 1 is output. By detecting all 0s, it is detected that the stopped faulty lane has recovered from the fault.

  As described above, by using the data transmission system of the first embodiment, even if a failure occurs in a part of the transmission lane (virtual lane), the normal transmission lane (virtual lane) is used and communication is performed. By reducing the capacity, connection of the entire link can be maintained. Furthermore, even when a transmission lane (virtual lane) stopped due to a failure is recovered from the failure, it can be restored as a normal lane while maintaining the connection of the entire link. As a result, typically, the communication capacity can be used effectively, and the fault tolerance can be improved.

(Embodiment 2)
The data transmission system according to the second embodiment is different from the data transmission system described in the first embodiment in a method for detecting a failure occurring in a virtual lane. FIG. 6 is a block diagram showing a detailed configuration example of the receiver 2 included in the data transmission system according to the second embodiment of the present invention. The receiver 2 (data transfer device) shown in FIG. 6 corresponds to the receiver 2 in the data transmission system of FIG. 1 described above, and the transmitter corresponding to the receiver is the configuration example of FIG. 2 described above. Can be used. Hereinafter, the description will be focused on the difference from the receiver of FIG. 3 described in the first embodiment.

  The receiver 2 shown in FIG. 6 receives a data string from x transmission lanes, and outputs received frame data (received data), used lane information, and failed lane information. The receiver 2 includes a signal detection unit (14-1 to 14-x), a PRBS inspection unit (15-1 to 15-x), a PRBS monitoring unit 16, a demultiplexer unit 17, a block synchronization unit (18-1 to 18-1). 18-p), synchronization monitoring unit 29, use lane determination unit 21, marker inspection unit (22-1 to 22-p), marker monitoring unit 23, phase difference detection unit 24, deskew unit 25, marker deletion unit 26, transmission A decoding unit 27 and a capacity conversion unit 28 are provided.

  First, the data flow of the receiver 2 will be described. Data strings output from the transmitter 1 via x transmission lanes are respectively input to the signal detection units (14-1 to 14-x). The signal detection units (14-1 to 14 -x) output the data string to the demultiplexer unit 17. The demultiplexer unit 17 includes p PRBS checking units (15-1 to 15-x) and p block synchronization units (18-1 to 18-) from the p output units included in the demultiplexer unit 17, respectively. The data string is output to p).

  The PRBS inspection unit (15-1 to 15-x) outputs the data string to the PRBS monitoring unit 16. The PRBS monitoring unit 16 outputs a data string to the use lane determining unit 21. The block synchronization unit (18-1 to 18-p) outputs a data string to the synchronization monitoring unit 29, the marker checking unit (22-1 to 22-p), and the deskew unit 25. The synchronization monitoring unit 29 outputs the data string to the use lane determining unit 21. The use lane determination unit 21 outputs a data string to the transmitter 1 and the marker monitoring unit 23.

  The marker inspection unit (22-1 to 22-p) outputs a data string to the marker monitoring unit 23 and the phase difference detection unit 24. The marker monitoring unit 23 outputs a data string to the capacity conversion unit 28 and the transmitter 1. The phase difference detection unit 24 outputs the data string to the deskew unit 25. The deskew unit 25 outputs the data string to the marker deletion unit 26 via p output units included in the deskew unit 25. The marker deletion unit 26 outputs the data string to the transmission decoding unit 27. The transmission decoding unit 27 outputs the data string to the capacity conversion unit 28. The capacity converter 28 finally outputs the received data.

  Next, a detailed operation example of the receiver 2 will be described. The transmission data string transmitted from the transmitter 1 is input to a plurality of signal detection units (14-1 to 14-x) provided in the receiver 2 via x transmission lanes. The signal detection units (14-1 to 14-x) execute clock synchronization processing of the data sequence and output the received data sequence to the demultiplexer unit 17. The demultiplexer unit 17 receives a data string from the signal detectors (14-1 to 14-x), separates the input data string into p virtual lanes, and separates the separated data string into a PRBS inspection unit (15-1 to 15-x) and the block synchronization unit (18-1 to 18-p).

  The PRBS inspection unit (15-1 to 15-x) inspects the pseudo random bit string in the received data string and notifies the PRBS monitoring unit 16 of the inspection result. The PRBS monitoring unit 16 monitors the inspection result notified from the PRBS inspection unit (15-1 to 15-x), and determines the lane to be used to determine whether or not to recover from a failure in the stopped virtual lane (in other words, the transmission lane). Notify unit 21.

  The block synchronization unit (18-1 to 18-p) synchronizes with the code block of the transmission data encoded by the transmission encoding unit 6 of the transmitter 1, aligns the code block for each virtual lane, and performs alignment. The data sequences of the code blocks are output to the synchronization monitoring unit 29, the marker checking units (22-1 to 22-p), and the deskew unit 25, respectively. Further, the block synchronization unit (18-1 to 18-p) notifies the synchronization monitoring unit 29 of the block synchronization status. That is, the synchronization monitoring unit 29 is notified of information such as code block synchronization not being completed or out of synchronization. The synchronization monitoring unit 29 monitors the code block synchronization result notified from the block synchronization unit (18-1 to 18-p), and notifies the use lane determination unit 21 of a failure occurring in the transmission lane (virtual lane).

  For example, the block synchronization unit (18-1 to 18-p) and the synchronization monitoring unit 29 monitor the bit string indicating the head position of the code block included in the data string output from each virtual lane, and receive the bit string correctly. If not, it is determined that a failure has occurred in the virtual lane. That is, the data string output from the virtual lane includes a bit string for synchronization, and when the above-described bit string is not received at a predetermined time interval, it is determined that a failure has occurred in the virtual lane.

  The marker inspection unit (22-1 to 22-p) inspects the alignment marker, and extracts the use lane information and the fault lane information inserted by the marker insertion unit (8-1 to 8-p) of the transmitter 1. The extracted information is notified to the marker monitoring unit 23. Further, the marker inspection unit (22-1 to 22-p) notifies the phase difference detection unit 24 of the virtual lane number and the detection timing. The marker monitoring unit 22 monitors the transmission capacity information notified from the marker inspection unit (22-1 to 22-p), detects that the transmission capacity has been changed in the transmitter 1, and the transmitter 1 The number of virtual lanes used, that is, the transmission capacity is determined, and the capacity conversion unit 28 is notified of the information on the transmission capacity.

  The phase difference detection unit 24, based on the virtual lane number and the detection timing notified from the marker inspection unit (22-1 to 22-p), the phase difference between the virtual lanes, that is, the skew amount and the reception position of the virtual lane. Is identified and notified to the deskew unit 25. The deskew unit 25 corrects the arrival time difference for each virtual lane and the received position shift based on the skew amount notified from the phase difference detection unit 24 and the reception position of the virtual lane, and sends it to the marker deletion unit 26. Output the received data string in the correct virtual lane order. The marker deletion unit 26 deletes the alignment marker inserted in the data sequence by the marker insertion unit (8-1 to 8-p) of the transmitter 1 and outputs the received data sequence to the transmission decoding unit 27.

  The transmission decoding unit 27 decodes the data sequence transmission-encoded by the transmission encoding unit 6 of the transmitter 1 into the original data sequence, and outputs the received data sequence to the capacity conversion unit 28. The capacity conversion unit 28 combines a data sequence transmitted through the virtual lane in use according to the transmission capacity determined by the marker monitoring unit 23, and expands the invalid signal interval between the data frames. The received frame data is output after being converted into a data string of the maximum transmission capacity of the transmission path.

  The used lane determining unit 21 receives information on the unusable lane from the synchronization monitoring unit 29 and information on the failure recovery lane from the PRBS monitoring unit 16, and the failure lane toward the transmitter 1 based on the information. Make a notification. That is, the fault lane notification includes information on the latest lane that can be used at the present time (in other words, information on a lane in which a fault continues at the present time). As a result, notification to avoid a virtual lane (in other words, a transmission lane) whose reliability has been significantly reduced can be performed, and notification to use a transmission lane (in other words, a virtual lane) recovered from a failure can be performed. It becomes.

  In addition, when the 64B / 66B code is used, the lane determination unit 21 uses, for example, a bit string having a header indicating an error from the virtual lane for a predetermined time based on the failure monitoring result from the synchronization monitoring unit 29. When the bit error rate is continuously input at an interval and the bit error rate becomes higher than a preset threshold value, block synchronization is removed and the virtual lane is determined to be unusable. Alternatively, the use lane determination unit 21 determines that the virtual lane is unusable when, for example, the number of block synchronization outages in the virtual lane is greater than a preset value.

  As described above, by using the data transmission system of the second embodiment, even if a failure occurs in a part of the transmission lane (virtual lane), as in the case of the first embodiment, a normal transmission lane By using (virtual lane) and reducing the communication capacity, the connection of the entire link can be maintained. Furthermore, even when a transmission lane (virtual lane) stopped due to a failure is recovered from the failure, it can be restored as a normal lane while maintaining the connection of the entire link. As a result, typically, the communication capacity can be used effectively, and the fault tolerance can be improved.

  In the second embodiment, the failure occurring in the virtual lane (transmission lane) is detected by monitoring the code block synchronization result. Of course, the bit error rate test result described in the first embodiment It is also possible to detect a fault lane in combination. In this case, the synchronization monitoring unit 29 of FIG. 6 may be added to the configuration example of FIG. The use lane determining unit 21 detects the fault lane by using both the code block synchronization result from the synchronization monitoring unit 29 and the bit error rate monitoring result from the BER monitoring unit 20, so that the reliability is higher. Fault lane detection can be realized.

(Embodiment 3)
The data transmission system according to the third embodiment is different from the data transmission systems according to the first and second embodiments in a control method from when a virtual lane failure is detected until the number of lanes is switched. That is, it corresponds to the modification of FIG. The block configuration of the data transmission system of the third embodiment is the same as that of FIG. 1, the transmitter of FIG. 2 is used as the transmitter of FIG. 1, and the receiver of FIG. 3 or the receiver of FIG. This can be realized by using a receiver.

  FIG. 7 is an explanatory diagram showing an example of main processing contents in the data transmission system according to the third embodiment of the present invention. First, the receiver 2 in the transceiver 3-1 uses the use lane determination unit 21 to determine a failure lane and a failure recovery lane in each virtual lane (each transmission lane), and obtains failure lane information reflecting the contents. A transfer request is made to the transmitter 1 in the transceiver 3-1 as a failure lane notification (S701). The transmitter 1 that has received the failure lane notification embeds the failure lane information in the alignment marker using the marker insertion unit 8 or the like and transfers it to the receiver 2 in the transceiver 3-2 (S702). The receiver 2 that has received the alignment marker extracts the fault lane information using the marker inspection unit 22 and the like, and transmits it to the transmitter 1 in the transceiver 3-2 as a fault information confirmation notification (S703).

  Upon receiving the failure information confirmation notification, the transmitter 1 in the transmitter / receiver 3-2 determines whether or not the failure lane information indicated by this notification has been changed based on the currently set failure lane information. It judges using (S704). When there is a change, the transmitter 1 embeds the fault lane information indicated by the fault information confirmation notification in the alignment marker and sends it to the receiver 2 in the transceiver 3-1 (S705). The receiver 2 in the transceiver 3-1 extracts the fault lane information from the alignment marker using the marker inspection unit 22 and the like, and compares it with the current fault lane information using the marker monitoring unit 23 and the like (S706, S707). ). Note that the current failure lane information is acquired from the use lane determination unit 21. When the comparison result matches, the receiver 2 sends information for permitting lane switching to the transmitter 1 in the transceiver 3-1 as a lane switching permission notification (S708). Receiving the lane switching permission notification, the transmitter 1 embeds information allowing lane switching in the alignment marker using the marker insertion unit 8 or the like, and sends the information to the receiver 2 in the transceiver 3-2 (S709).

  The receiver 2 in the transmitter / receiver 3-2 detects information allowing lane switching from the alignment marker using the marker inspection unit 22 or the like, and uses the detected information as a lane notification to the transmitter 1 in the transmitter / receiver 3-2. Tell (S710). Upon receiving the use lane notification, the transmitter 1 replaces the data with idle so that the MAC layer (capacity conversion unit 5 and the like) has a communication capacity corresponding to the number of used lanes (S711). In the physical layer of the transmitter 1, data is allocated to virtual lanes that can be used using the round robin unit 7 (S712), and information on the timing for switching lanes using the marker insertion unit 8 is embedded in the alignment marker. The data is sent to the receiver 2 in the transceiver 3-1 (S713). At this time, the transmitter 1 uses the PRBS generation unit 10 and the like to output a pseudo-random bit string for determining return from failure for the lane to be stopped. The receiver 2 in the transmitter / receiver 3-1 detects information of timing for switching lanes using the marker checking unit 22 or the like (S <b> 714), and performs switching so as to perform decoding on usable virtual lanes. (S715).

  As described above, by using the data transmission system of the third embodiment, even if a failure occurs in a part of the transmission lane (virtual lane), as in the case of the first and second embodiments, it is normal. By using a transmission lane (virtual lane) and reducing the communication capacity, the connection of the entire link can be maintained. Furthermore, even when a transmission lane (virtual lane) stopped due to a failure is recovered from the failure, it can be restored as a normal lane while maintaining the connection of the entire link. As a result, typically, the communication capacity can be used effectively, and the fault tolerance can be improved.

  Here, when comparing the flow of FIG. 5 and the flow of FIG. 7, it is assumed that an error has occurred in the transmission process in the unanimous decision (S504, S511) in FIG. Discarded as impossible. That is, this process does not compare with accurate information, but determines whether the information is relatively reliable. On the other hand, in the failure lane coincidence determination (S707) in FIG. 7, accurate information transmission is confirmed by having the sent failure lane information sent back and compared with correct information. That is, this process is compared with accurate information to determine whether the information is absolutely reliable. Using the flow of FIG. 5 makes it possible to switch lanes at an early stage, but the reliability associated with lane switching is slightly reduced. Using the flow of FIG. 7 makes switching lanes slightly slower, but more reliable. It is possible to switch high lanes. However, using either the flow of FIG. 5 or the flow of FIG. 7, in practice, the probability of erroneous lane switching can be sufficiently reduced, and a highly reliable data transmission system can be realized.

  Subsequently, characteristic configurations of the data transmission system obtained by each of the above-described embodiments will be listed below.

  (1) A data transmission system according to the present embodiment is a transmission system including a transmitter that transmits transmission data to a receiver, a receiver that receives the transmission data from the transmitter, the transmitter, and A receiver that receives transmission data from a transmitter is connected by a first transmission path, and the first transmission path is configured by bundling a first number of transmission lanes, and the transmitter and the receiver are configured as described above. There are a number of virtual lanes that can be multiplexed onto the first number of transmission lanes.

  Here, the transmitter divides the transmission data into a data string of the number of usable virtual lanes based on use lane information transmitted from the receiver and including information on usable virtual lanes. The identification information for identifying the virtual lane from which the data string is output and the usable lane information are inserted into the data string output from the virtual lane, and the data string output from the virtual lane is The transmission data is multiplexed to the receiver by multiplexing based on the number of transmission lanes of the first transmission path and outputting the multiplexed data string from each transmission lane constituting the first transmission path to the receiver. A data string having a DC balance is transmitted to a virtual lane that cannot be used.

  On the other hand, the receiver receives the multiplexed data sequence from transmission lanes constituting the first transmission path, and uses the usable lane information based on the usable lane information inserted in the received data sequence The received data string is divided into a data string having a number of virtual lanes, each transmission lane of the first transmission path and the BER of each virtual lane are monitored, and based on the monitoring result of the bit error rate of the transmission lane Determining a faulty lane and a used lane, determining a usable virtual lane based on the determination result, and transmitting used lane information including information on the determined usable virtual lane to the transmitter, Based on the detected identification information, a difference in arrival order of the received data string and a temporary error caused by a difference in arrival time of the data string between the transmission lanes. To correct the deviation of the received position in the lane, to restore the divided data string to the transmission data.

  (2) Further, in the data transmission system according to the present embodiment, in the data transmission system according to (1), the transmitter transmits a bit error of an operating lane based on a data string output from each virtual lane. Parity for measuring the rate is calculated, the calculated parity is inserted into a data string output from the virtual lane, and a DC balance of the data balance transmitted from the virtual lane determined as the failed lane is calculated. The taken data string is inserted as a pattern for detecting return from a failure in a stopped lane.

  (3) Further, in the data transmission system according to the present embodiment, in the data transmission system of (2), the receiver monitors a signal of a data string output from each transmission lane of the first transmission path, The bit error rate of the virtual lane is calculated based on the parity calculated by the transmitter and inserted in the data string output from the virtual lane, and the virtual lane in the virtual lane is calculated based on the calculated error rate. The faulty lane is determined, and based on a DC balanced data string output from the stopped virtual lane, it is determined whether the stopped virtual lane can be recovered from the fault, and the usable virtual lane is determined. When determining, based on the determination result, the usable virtual label is used so that the faulty lane is not used and the lane recovered from the fault is used. Determining the down, to generate the usable lane information including information about the determined available virtual lane, the available lane information the generated has assumed to be transmitted to the transmitter.

  (4) Further, in the data transmission system according to the present embodiment, in the data transmission system according to (1), the receiver includes a code block included in a data string output from each virtual lane of the first transmission path. When the bit string indicating the head position is monitored and the bit string is not correctly received, it is determined that a failure has occurred in the virtual lane (that is, the data string output from the virtual lane has a bit string for synchronization) In the case where the above-described bit sequence is not received at a predetermined time interval, it is determined that a failure has occurred in the virtual lane), and based on the DC balanced data sequence output from the stopped virtual lane, When determining whether or not to recover from a fault in a stopped virtual lane and determining the usable virtual lane, the fault lane is determined based on the determination result. Determining the usable virtual lane so that a lane that has not been used and recovered from a failure is used, and generates the usable lane information including information on the determined usable virtual lane, The generated usable lane information is transmitted to the transmitter.

  (5) Furthermore, the data transmission system according to the present embodiment has the following control method. First, the receiver 2 monitors the bit error rate of each virtual lane, sends fault lane information to the transmitter 1, and the transmitter 1 that has received the fault lane information embeds the fault lane information in an align marker and stores it in the receiver 2. The receiver 2 that has sent and received the alignment marker extracts the fault lane information and transmits it to the transmitter 1, and in the MAC layer of the transmitter 1, the data is replaced with idle so that the communication capacity according to the number of used lanes is obtained. In the physical layer of the transmitter 1, data is allocated to available virtual lanes, the used lane information is embedded in an alignment marker, sent to the receiver 2, and a random bit string for determining return from failure is stored in the lane to be stopped. The receiver 2 that has output and received the alignment marker including the used lane information extracts the used lane information and decodes the usable virtual lane. It performs switching so.

  (6) The data transmission system according to the present embodiment has the following control method. First, the receiver 2 monitors the bit error rate of each virtual lane, sends fault lane information to the transmitter 1, and the transmitter 1 that has received the fault lane information embeds the fault lane information in an align marker and stores it in the receiver 2. The receiver 2 that has sent and received the alignment marker extracts the fault lane information and transmits it to the transmitter 1. The transmitter 1 embeds the fault lane information in the alignment marker and sends it to the receiver 2. The failure lane information is extracted and compared with the current failure lane information. When the failure lane information sent from the transmitter 1 matches the current failure lane information, the receiver 2 transmits information for permitting lane switching. The transmitter 1 embeds information that permits lane switching in the align marker and sends it to the receiver 2, and the receiver 2 switches the lane from the align marker. The permitted information is detected and transmitted to the transmitter 1, and the MAC layer of the transmitter 1 replaces data with idle so that the communication capacity corresponds to the number of lanes used, and the virtual layer that can be used in the physical layer of the transmitter 1 Data is distributed to the lanes, information on the timing for switching the lanes is embedded in the alignment marker, sent to the receiver 2, and a random bit string for determining recovery from the failure is output to the lanes to be stopped. Is detected, and switching is performed so as to perform decoding on the usable virtual lanes.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

  For example, in each of the embodiments described above, the receiver 2 in FIGS. 3 and 6 uses the use lane determination unit 21 to determine a usable lane that reflects the failure lane and the failure recovery lane, Although output as a lane notification, the process for making this determination is not necessarily performed by the receiver 2. That is, if the transmitter 1 obtains information on the fault lane and information on the fault recovery lane from the receiver 2, it is possible to determine a lane that can be used by the transmitter 1. However, in this case, since the amount of information notified from the receiver 2 to the transmitter 1 increases, it is desirable for the receiver 2 to determine from this point of view.

  In addition, here, a pseudo-random data string is used to detect the failure recovery lane, but if the data pattern is fixedly fixed, the pseudo-random data string is not necessarily required. However, it is desirable to use a pseudo-random data sequence in order to more accurately determine the state of the transmission lane in consideration of data pattern dependency such as intersymbol interference.

  Further, in each of the above-described embodiments, the data transmission system that performs communication by multiplexing the virtual lanes to the physical lanes having a smaller number of the virtual lanes has been described as an example. However, the embodiment is not necessarily limited to such a system. Instead, the present invention can be similarly applied to any data transmission system that transmits data strings in parallel using a plurality of physical lanes.

  Furthermore, in the above-described embodiment, as shown in FIG. 1, a data transmission system in which two transceivers 3-1 and 3-2 are connected by two transmission lanes LN1 and LN2 consisting of x lines is used. However, the present invention is not limited to this, and in some cases, a data transmission system including one transmitter 1 and one receiver 2 can be used. In this case, for example, a transmitter 1 and a receiver 2 are connected by x transmission lanes LN1, and a dedicated communication line for performing a use lane notification, a failure lane notification, or the like is provided from the receiver 2 to the transmitter 1. It may be provided.

  The data transmission system and the data transmission apparatus according to the present embodiment are particularly useful when applied to a multilane transmission system that increases speed by bundling a plurality of low-speed signals between a transmitter and a receiver, The present invention is not limited to this, and can be widely applied to all data transmission systems that perform common recognition of communication conditions between a transmitter and a receiver.

DESCRIPTION OF SYMBOLS 1 Transmitter 2 Receiver 3 Transmitter / receiver 4 Frame buffer 5 Capacity conversion part 6 Transmission encoding part 7 Round robin part 8 Marker insertion part 9 Marker management part 10 PRBS generation part 11 Selector part 12 Multiplexer part 13 Fault management part 14 Signal detection Section 15 PRBS inspection section 16 PRBS monitoring section 17 Demultiplexer section 18 Block synchronization section 19 BER inspection section 20 BER monitoring section 21 Use lane determination section 22 Marker inspection section 23 Marker monitoring section 24 Phase difference detection section 25 Deskew section 26 Marker deletion section 27 Transmission decoding unit 28 Capacity conversion unit 29 Synchronization monitoring unit 40 EXOR circuit LN Transmission lane

Claims (13)

A first transmitter, a first receiver, N first transmission lanes serving as communication paths from the first transmitter to the first receiver, and the first transmitter to the first transmitter. A first communication means serving as a communication path toward
The first transmitter outputs transmission data to the first receiver for a normal lane in which no failure has occurred among the N first transmission lanes based on the failure lane information, First means for outputting a specific first data pattern to the first receiver targeting a faulty lane in which a fault has occurred among the N first transmission lanes;
The first receiver
A second means for monitoring a reception state of the transmission data transmitted through the normal lane and determining whether or not the reception state is normal;
A third means for monitoring a reception state of the first data pattern transmitted via the fault lane and determining whether or not the reception state is normal;
One of the first receiver and the first transmitter is configured so that the normal lane among the N first transmission lanes is based on a determination result of the second means and a determination result of the third means. And the location of the failed lane are updated, and the updated lane information is generated by reflecting the updated result. The data transmission system according to claim 1, wherein
The first means includes a scrambler having a plurality of stages of shift registers and a tap of a specific stage, and generates pseudo-random data using the scrambler as the first data pattern,
The third means includes a descrambler having the same number of taps as the shift register having the same number of stages as the first means, and determines whether or not the pseudo-random data has been correctly transmitted using the descrambler. A data transmission system characterized by that. The data transmission system according to claim 1, wherein
The transmission data includes an error detection code,
The data transmission system characterized in that the second means determines the reception state of the transmission data by determining the error detection code included in the transmission data. The data transmission system according to claim 1, wherein
The transmission data includes a bit string for synchronization,
The data transmission system according to claim 2, wherein the second means determines a reception state of the transmission data by monitoring a reception state of the synchronization bit string included in the transmission data. The data transmission system according to claim 2, wherein
The first transmitter further includes:
A transmission encoding unit that performs transmission encoding of a transmission frame input from an upper layer;
X (X> N) first virtual lanes that separate and transmit the bit string output from the transmission encoding unit in parallel;
A multiplexer unit that multiplexes and outputs the bit string transmitted through the X first virtual lanes to the N first transmission lanes;
The first receiver further includes:
A demultiplexer unit for separating a bit string transmitted through the N first transmission lanes into the X pieces;
The X second virtual lanes transmitting the X bit strings separated by the demultiplexer unit in parallel,
The first means further includes the X selectors having one of two inputs connected to the outputs of the X first virtual lanes and the other of the two inputs connected to the outputs of the scrambler in common. With a circuit,
The data transmission system, wherein the descrambler is provided on each of the X second virtual lanes. The data transmission system according to claim 1, wherein
And a second transmitter, a second receiver, and the N second transmission lanes serving as communication paths from the second transmitter to the second receiver,
The first transmitter and the second receiver are implemented in a first transceiver;
The second transmitter and the first receiver are implemented in a second transceiver;
The first transceiver includes a first communication path from the second receiver to the first transmitter;
The second transceiver includes a second communication path from the first receiver to the second transmitter;
The data transmission system according to claim 1, wherein the first communication means is realized by the second communication path, the N second transmission lanes, and the first communication path. The data transmission system according to claim 6, wherein
The first transmitter further includes:
A first transmission encoding unit for transmission encoding a transmission frame input from an upper layer;
X (X> N) first A virtual lanes that separate and transmit the bit string output from the first transmission encoding unit in parallel;
Inserting the X first markers inserted into the X first A virtual lanes and inserting and outputting a first marker for each of the bit strings transmitted on the X first A virtual lanes And
A first multiplexer unit that multiplexes and outputs the bit string transmitted through the X first marker insertion units to the N first transmission lanes;
The first receiver further includes:
A first demultiplexer unit that separates the bit string transmitted through the N first transmission lanes into the X pieces;
The X first B virtual lanes transmitting the X bit strings separated by the first demultiplexer unit in parallel;
The X first marker inspection units provided on the X first B virtual lanes, respectively, for extracting the first markers from bit strings transmitted on the X first B virtual lanes. ,
The second transmitter is
A second transmission encoding unit that transmits and encodes a transmission frame input from an upper layer;
The X second A virtual lanes for separating and transmitting the bit string output from the second transmission encoding unit in parallel;
Inserting the X second markers inserted into the X second A virtual lanes and inserting and outputting a second marker for each bit string transmitted on the X second A virtual lanes And
A second multiplexer unit that multiplexes and outputs the bit string transmitted through the X second marker insertion units to the N second transmission lanes;
The first receiver
A second demultiplexer unit that separates the bit string transmitted through the N second transmission lanes into the X pieces;
The X second B virtual lanes transmitting the X bit strings separated by the second demultiplexer unit in parallel;
The X second marker inspection units are provided on the X second B virtual lanes, respectively, and extract the second markers from bit strings transmitted on the X second B virtual lanes. A data transmission system characterized by that. The data transmission system according to claim 7, wherein
The determination result by the second means and the third means of the first receiver is transmitted to the second transmitter via the second communication path, and then the second marker of the second transmitter is used. And transmitting to the second receiver, and then transmitting to the first transmitter via the first communication path. A first transmitter for transmitting to N first transmission lanes;
A first receiver for receiving from the N second transmission lanes;
A first communication path from the first receiver to the first transmitter,
The first transmitter outputs first transmission data for a first normal lane in which no failure has occurred among the N first transmission lanes based on first failure lane information, and the N First means for outputting a specific first data pattern for a first failed lane in which a failure has occurred among the first transmission lanes of the book,
The first receiver
A second state of monitoring the reception state of the second transmission data transmitted through the second normal lane in which no failure has occurred from among the N second transmission lanes, and determining whether or not the reception state is normal Means,
The reception state of a specific second data pattern transmitted through the second failure lane in which a failure has occurred is monitored from among the N second transmission lanes, and it is determined whether or not this reception state is normal. A third means;
Based on the determination results of the second means and the third means, the position of the normal lane and the position of the faulty lane in the N second transmission lanes are updated, and the updated result is reflected. A fourth means for making a transfer request of two fault lane information to the first transmitter via the first communication path;
The first transmitter further includes fifth means for transferring the second fault lane information requested to be transferred via the first communication path to the N first transmission lanes.
The first receiver further notifies the first transmitter via the first communication path of the notification of the first failure lane information transferred via the N second transmission lanes. And a sixth means for performing data transmission. The data transmission device according to claim 9, wherein
The first data pattern and the second data pattern have the same regularity,
The first means includes a scrambler having a plurality of stages of shift registers and a tap of a specific stage, and generates pseudo-random data using the scrambler as the first data pattern,
The third means includes a descrambler having the same number of taps as the shift register having the same number of stages as the first means, and determines whether the second data pattern has been correctly transmitted using the descrambler. A data transmission device. The data transmission device according to claim 9, wherein
The second transmission data includes an error detection code,
The data transmission apparatus according to claim 2, wherein the second means determines a reception state of the second transmission data by determining the error detection code included in the second transmission data. The data transmission device according to claim 9, wherein
The second transmission data includes a bit string for synchronization,
The data transmission apparatus according to claim 2, wherein the second means determines a reception state of the second transmission data by monitoring a reception state of the synchronization bit string included in the second transmission data. The data transmission device according to claim 10, wherein
The first transmitter further includes:
A transmission encoding unit that performs transmission encoding of a transmission frame input from an upper layer;
X (X> N) first virtual lanes that separate and transmit the bit string output from the transmission encoding unit in parallel;
A multiplexer unit that multiplexes and outputs the bit sequence transmitted through the X first virtual lanes to the N first transmission lanes;
The first receiver further includes:
A demultiplexer that separates the bit string transmitted through the N second transmission lanes into the X lines;
The X second virtual lanes transmitting the X bit strings separated by the demultiplexer unit in parallel,
The first means further includes the X selectors having one of two inputs connected to the outputs of the X first virtual lanes and the other of the two inputs connected to the outputs of the scrambler in common. With a circuit,
The data transmission apparatus, wherein the descrambler is provided on each of the X second virtual lanes.

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