WO2014029253A1 - Procédé servant à extraire une horloge de service client d'un réseau otn - Google Patents

Procédé servant à extraire une horloge de service client d'un réseau otn Download PDF

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Publication number
WO2014029253A1
WO2014029253A1 PCT/CN2013/079967 CN2013079967W WO2014029253A1 WO 2014029253 A1 WO2014029253 A1 WO 2014029253A1 CN 2013079967 W CN2013079967 W CN 2013079967W WO 2014029253 A1 WO2014029253 A1 WO 2014029253A1
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Prior art keywords
adjustment
clock
amount
frequency
data
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PCT/CN2013/079967
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English (en)
Chinese (zh)
Inventor
李光瑜
冯波
海增强
郑林
魏明
张睿
李剑峰
胡杰
郑哲文
沈羽纶
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烽火通信科技股份有限公司
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Publication of WO2014029253A1 publication Critical patent/WO2014029253A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/062—Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605—Fixed allocated frame structures
    • H04J3/1652—Optical Transport Network [OTN]

Definitions

  • the present invention relates to the field of optical transport network (OTN) communication technology, and more specifically to an implementation method for extracting a customer service clock (referring to a transmission clock of a customer service) in an 0TN network. This is especially true for the implementation of the transmit clock extraction for the GE, STM16, and 0TU1 client services in the 0TN network.
  • OTN optical transport network
  • 0TN has become the main optical transport network technology.
  • mainstream operators at home and abroad are very concerned about the development and application of 0TN technology.
  • Most operators' WDM transmission interfaces have realized 0TN functions.
  • the 0TN concept covers two layers of optical and electrical layers.
  • One of its key technical features is: a variety of customer signal packaging and transparent transmission.
  • the 0TN frame structure based on ITU-T G.709 can support mapping and transparent transmission of multiple client signals, such as SDH, ATM, Ethernet, etc.
  • the client when the client sends the service, it must extract the sending clock of the customer service (referred to as the customer service clock), and its clock frequency must be consistent with the service receiving clock before the 0TN bearer corresponds to the customer service.
  • the customer service clock the sending clock of the customer service
  • FIFO buffer redundancy control plus high-precision digital phase-locked loop
  • FIFO buffer redundancy control plus plug-in digital frequency synthesizer
  • FIFO buffer redundancy control plus high-precision digital phase-locked loop scheme is difficult to implement, clock tracking adjustment delay is long, high-precision digital phase-locked loop technology is too complicated, and the implementation cost is too high.
  • the FIFO buffer redundancy control plus the external digital frequency synthesizer scheme adjusts the clock only by the FIFO buffer state, which is limited by the judgment period and the adjustment step size of the external digital synthesizer. If the judgment period is short, the buffer redundancy error is large, and the clock adjustment is frequent, the clock jitter will be too large; the adjustment step size is too small or too large, and the tracking process
  • the cache is frequently empty or full. At this time, the cache redundancy value is unavailable, and the effective clock adjustment information cannot be extracted. When the device is cascading too much, the cache redundancy causes an iterative effect, resulting in excessive clock jitter.
  • the object of the present invention is to provide a method for implementing client service clock extraction in an OTN network, which is mainly used for clock extraction of a client-side service sender of an OTN device, and is used for implementing client services in a 0TN network. Transparent transmission, this method can recover high-performance customer service clock from 0TN anger and meet the jitter requirements of various customer services.
  • a method for realizing client service clock extraction in a 0TN network characterized in that: using statistical control plus a plug-in digital frequency synthesizer, the first step is to perform synchronous smoothing on the 0TN system clock for the customer service that is decrypted by the 0TN network.
  • the second step the clock extraction control process: statistically compare and compare the smoothed data volume with the amount of data sent by the customer service, and control the clock adjustment information by the weighting algorithm combined with the FIFO buffer redundancy
  • third, Clock extraction adaptation processing clock adjustment information provided by the clock extraction control processing, converted into accurate frequency adjustment information required by the external digital frequency synthesizer, and precise control of the external digital frequency synthesizer to generate a service transmission clock through the serial control interface .
  • Step 1 Set a smoothing time window, usually set according to the 0TN frame period of the 0TN line interface.
  • Step 2 Calculate the nominal data volume of the customer service in a smoothing time window.
  • Step 3 Calculate the amount of data that may be generated by the client service in a smooth time window according to the tolerance frequency offset of the customer service and the tolerance frequency offset of the 0TN interface. , the data volume package Include a larger value, an intermediate value, and a smaller value, and the amount of data is an integer.
  • Step 4 Detect the buffer status of the same RAM, and calculate the amount of data to be read by the smoothing time window, in a smoothed time window. The starting position is used to detect whether the readable space of the RAM is at the upper limit, the lower limit or the central area.
  • the amount of data to be read in the smoothing time window is a larger value calculated in step 3; for example, at the lower limit, the smoothing time
  • the amount of data to be read by the window is the smaller value calculated in step 3; as in the central area or abnormal condition, the amount of data to be read in the smoothing time window is the intermediate value calculated in step 3;
  • Step 5 According to the calculated amount of data to be read in a smoothing time window, a relatively uniform gap is generated, and the data is evenly read out from the synchronous RAM, and the customer business smoothing data can be obtained.
  • the second step includes the following specific steps:
  • Step 1 Calculate the 0-inch clock adjustment period T, one smoothing time window is a clock adjustment period ⁇ , the threshold value can be configured, the larger the threshold value, the statistical data volume is more accurate, but it cannot be infinitely large, if it is too large
  • the tracking time of the clock extraction will be long, and i needs a larger buffer
  • Step 2 Calculate the nominal amount of data of the customer service within a clock adjustment period T
  • Step 3 Calculate the smoothing of a clock adjustment period T
  • the amount of data that is, the amount of data received by the FIFO, FIR
  • the amount of data should be within the nominal value X (1+/-- (customer service tolerance maximum frequency offset +20ppm+redundant frequency offset)), otherwise the amount of data received by the FIFO should be Set to the nominal value, where 20ppm is the 0TN line tolerant frequency offset; the redundant frequency offset is set by itself to absorb the jitter and ensure that the circuit can tolerate a larger frequency offset, such as the jitter of the inlet data
  • Step 4 Statistically calculate the amount of data read by the FIFO in a clock adjustment period T, that is, the amount of data sent by the FIFO;
  • Step 5 Calculate the difference between the amount of FIFO received data and the amount of data sent by the FIFO in a clock adjustment period T.
  • the difference should be in the range of the nominal value X ((Customer Service Tolerance Maximum Frequency Offset + 20ppm + Redundant Frequency Offset)) If the difference is not within this range, it indicates that the line rate or the transmission clock frequency is incorrect. At this time, the alarm is reported and the difference is set to zero.
  • Step 6 Clock adjustment window setting, if there are both clock adjustments and advances in each cycle The decision will cause errors in the judgment. In order to avoid this situation, the current period adjustment is adopted, and the next period of the judgment is alternately processed to ensure that the clock is stable in the previous period of the judgment;
  • Step 7 Clock extraction control, clock extraction control The difference between the FIFO receiving and transmitting, and the FTF0 readable spatial information algorithm to calculate the clock adjustment direction and the adjustment byte amount.
  • the readable space information of the FIFO is used to generate clock fine-tuning control to ensure that the FIFO operates in a safe area.
  • the specific steps of generating the fine-tuning control of the day clock are: determining the FIFO readable space in the TO cycle judgment position, and giving a positive adjustment fine-tuning information when the readable space is greater than 256; when the readable space is less than 256 Give a negative adjustment fine-tuning information; when the readable space is 256, the positive adjustment fine-tuning information is generated in the above TO period, and the Bay U generates a negative fine-tuning information, and the negative adjustment information is generated in the TO period, and a positive adjustment fine-tuning is generated. Information, otherwise, does not produce any fine adjustment information.
  • the clock adjustment direction and the adjustment byte amount are generated including the following steps:
  • the difference between the amount of data received by the FIFO and the amount of data transmitted by the FIFO is outside the range of the nominal value X ( +/- - (Customer Service Tolerance Maximum Frequency Offset + 20ppm + Redundant Frequency Offset):). Adjust, adjust the byte amount to 0; if the difference B is within this range, the clock is adjusted as follows:
  • the difference B is 0, if there is positive adjustment fine adjustment information, the clock adjustment direction is positive adjustment, the adjustment amount is 1; if there is negative adjustment fine adjustment information, the clock adjustment direction is negative adjustment, the adjustment amount is 1; if there is no fine adjustment Information, then no adjustment, the adjustment amount is 0;
  • the absolute value of the difference B is greater than 1, if the received byte amount is greater than the transmitted byte amount, the clock adjustment direction is positively adjusted, and the adjustment amount is: Receive byte amount - Send byte amount ⁇ + Positive adjustment fine adjustment information - Negative adjustment Fine-tuning information; if the amount of received bytes is less than the amount of transmitted bytes, the clock The adjustment direction is negative adjustment, and the adjustment amount is: Send byte amount - Receive byte amount - Positive adjustment fine adjustment information + Negative adjustment fine adjustment information;
  • the difference B is equal to 1, if there is positive adjustment fine adjustment information, the clock adjustment direction is positive adjustment, the adjustment amount is 2; if there is negative adjustment fine adjustment information, the clock is not adjusted, the adjustment amount is 0; if there is no micro adjustment information, the clock The adjustment direction is positive adjustment, and the adjustment amount is 1;
  • the third step includes the following specific steps: Step 1: Converting the adjustment amount of the day t clock extraction control into the adjustment step of the frequency adjustment control word or the frequency offset offset required by the external digital frequency synthesizer Long; the minimum unit of adjustment of the clock extraction control is byte, and the adjustment step of the frequency adjustment control word or the frequency offset offset is small, and the adjustment of the clock extraction control is gradually reduced to 0 near a plurality of adjustments; 2 : Generate accurate frequency adjustment information required by the external digital frequency synthesizer: First set a customer service nominal frequency adjustment control word or frequency offset offset, the frequency adjustment control word or frequency offset offset is configured to the plug-in through the serial interface The digital frequency synthesizer generates a reference customer service clock; then, when there is positive adjustment information, the output frequency adjustment control word or frequency offset offset is the last configured adjustment control word or frequency offset offset + adjustment step size When there is negative adjustment information, the output frequency adjustment control word or frequency offset offset is the last configured adjustment control A word offset or the frequency offset adjustment step; when no
  • Step 3 Configure the calculated frequency adjustment control word or frequency offset offset to the external digital frequency synthesizer chip through a serial interface suitable for the external digital frequency synthesizer, and the external digital frequency synthesizer chip can output accurate customer service.
  • Send the clock On the basis of the above technical solution, when the adjustment amount of the clock extraction control is larger, the adjustment step of the frequency adjustment control word or the frequency offset offset is set larger; when the adjustment amount of the clock extraction control is small, the frequency adjustment control Adjust the step size of the word or frequency offset offset.
  • a frequency adjustment control word or a frequency offset offset maximum value and a minimum value are set, and when the clock adjustment is performed, if the calculated frequency adjustment control word or the frequency offset offset exceeds the maximum value or the minimum value When the value is used, the output frequency adjustment control word or the frequency offset offset is the set maximum or minimum value;
  • the maximum and minimum values are calculated according to the customer service tolerance frequency offset plus a redundant frequency offset of 15 ⁇ ⁇ ⁇ .
  • the method for implementing customer service clock extraction in the 0TN network uses a statistical method to predict the service clock rate of the bearer customer service, and supplements the cache redundancy to fine-tune the clock to ensure that the cache works in a secure area.
  • the method is difficult to implement and low in implementation cost; the clock extraction process is mainly controlled by statistics, and does not depend on the cache working state, and is safe and reliable; the abnormality in the statistical process will be filtered in time, and the device cascade time does not cause an iterative effect.
  • the extracted day clock is of better quality.
  • Figure 1 shows the mapping of customer services to the 0TN network structure
  • Figure 2 is a trend diagram of customer service in the 0TN network
  • FIG. 3 is a functional diagram of a clock extraction system provided by the present invention.
  • Figure 4 is a clock decision cycle diagram
  • Figure 5 is a flow chart of clock fine-tuning
  • Figure 6 shows the flow chart of the clock adjustment.
  • the method for realizing the extraction of the customer service clock in the OTN network of the present invention is applicable to the clock recovery of the client service transparently transmitted in the 0TN network, and can effectively filter the jitter generated by the mapping and demapping process of the customer service, and generate accurate
  • the clock control information recovers the high-performance customer service transmission clock through the external digital frequency synthesizer.
  • the 0TN frame structure based on ⁇ ---TG, 709 can support mapping and transparent transmission of multiple client signals.
  • the present invention mainly supports low-speed customer services of GE, STM16 and 0TU1.
  • Figure 1 shows the mapping of customer services to the 0TN network structure. After the customer service passes through various mapping paths, a high-order 0TN frame is formed to be transparently transmitted on the 0TN network, and various client services are deframed from the 0TN network.
  • FIG. 2 shows the trend of customer service in the 0TN network.
  • the client A forms a high-order 0TN frame transparently transmitted on the 0TN network.
  • the site B de-frames various customer services from the 0TN network.
  • the client service extracted from the site B itself does not carry any timing information.
  • the transmission date of the site B client service must be restored, so that the service is sent at the rate received from the site A.
  • FIG. 3 is a functional diagram of a system design provided by the present invention.
  • the method for implementing the client service clock extraction in the 0TN network is: using statistical control plus a plug-in digital frequency synthesizer, the first step is to perform synchronous synchronization on the 0TN system de-framed client service under the 0TN system clock.
  • the second step the clock extraction control process: statistically compare and compare the smoothed data volume with the amount of data sent by the customer service, and control the clock adjustment information by the weighting algorithm combined with the FIFO buffer redundancy
  • the third step Clock extraction adaptation processing The clock adjustment information provided by the clock extraction control processing is converted into the precise frequency adjustment information required by the external digital frequency synthesizer, and the external digital frequency synthesizer is accurately controlled by the serial control interface to generate the service transmission. Day clock.
  • the smoothing of the customer service includes the following steps:
  • Step h Set a smoothing time window, which is usually set according to the 0TN frame period of the 0TN line interface. If the line side is () TU1, the smoothing time window is determined according to the time of a 0TU1 frame in the system clock domain of 0TU1; The line side is 0DU2, then according to 0DU2 The system clock domain under an 0DU2 indignation time to determine the smoothing time window;
  • Step 2 Calculate the nominal data volume of the customer service in a smoothed time window, such as a 0TU1 instalment cycle time, GE's nominal data volume is 6121. 4, STM16's nominal data volume is 7616; - 0DU2 frame period Time, GE's nominal data volume is 1523. 9, STM16's nominal data volume is 1896;
  • Step 3 Calculate the amount of data (required as an integer) that may be generated by the client service in a smoothed time window according to the tolerated frequency offset of the customer service and the tolerance of the 0TN interface tolerance.
  • the data volume includes a larger value and an intermediate value. Value and a smaller value, such as a 0TU1 frame cycle time, the smoothed GE data volume may be 6120, 6121 or 6122, and the STM16 data volume may be 7615, 7616 or 7617;
  • Step 4 Detect the buffer state of the synchronous RAM, calculate the amount of data to be read in the smoothing time window, and detect whether the readable space of the RAM is at the upper limit, the lower limit, or the central area at a start position of a smoothed time window, such as at the upper limit.
  • the amount of data to be read in the smoothing interval window is the larger value calculated in step 3; if at the lower limit, the amount of data to be read in the smoothing time window is the smaller value calculated in step 3; as in the center area or the abnormality
  • the amount of data to be read by the smoothing time window is the intermediate value calculated in step 3;
  • Step 5 According to the calculated amount of data to be read in a smooth inter-day window, a relatively uniform gap is generated, and the data is evenly read out from the synchronous MM, and the customer business smooth data is obtained.
  • the client service is mapped to the 0TN network through one or more levels.
  • the client service introduces jitter during the mapping and demapping process. After the i client service is solved, it is in the clock domain of 0TN, and there will be data bursts, which will cause The customer service clock extraction difficulty is increased, and the clock performance index is not good.
  • the client data decoded by 0TN needs to be smoothed, and the smoothing process is composed of a synchronous cache RAM and a control logic.
  • the second step the statistics and the amount of data sent by the client are compared and compared, and the clock adjustment information is controlled by the weighting algorithm combined with the FIFO buffer redundancy, that is, the clock extraction control process, and the day clock extraction control process is performed by an asynchronous
  • the cache FIFO and a clock extraction control processing logic are formed.
  • Step h Calculate the clock adjustment period T.
  • One smoothing time window is a clock adjustment period ⁇
  • the threshold value can be configured. The larger the threshold value is, the statistical data volume is more accurate, but it cannot be infinitely large. If it is too large, the clock is extracted.
  • Step 2 ' Calculate the nominal amount of data for the customer's service within a clock adjustment period T
  • Step 3 Calculate the amount of smoothed data within a clock adjustment period T, That is, the amount of data received by the FIFO, the amount of data received by the FIFO should be within the nominal value X (I - (Customer Service Tolerance Maximum Frequency Offset + 20ppm + Redundant Frequency Offset)), otherwise the amount of data received by the FIFO should be set to the nominal value, where 20ppm is the 0TN line tolerant frequency offset; the redundancy frequency offset can be set by itself to absorb the jitter and ensure that the circuit can tolerate a larger frequency offset, such as the jitter of the inlet data amount is too large, and the statistical average is required;
  • Step 4 Statistically calculate the amount of data read by the FIFO in a clock adjustment period T, that is, the amount of data sent by the FIFO;
  • Step 5 Calculate the difference between the amount of FIFO received data and the amount of data sent by the FIFO in a clock adjustment period T.
  • the difference should be at the nominal value X ((Customer Service Tolerance Maximum Frequency Offset + +20ppm + Redundant Frequency Offset) Within the range, the difference is not within this range, indicating that the line rate or the transmission clock frequency is incorrect. At this time, the alarm is reported and the difference is set to zero.
  • Step 6 The clock adjustment window is set. If there are both clock adjustment and judgment in each cycle, an error will be caused to the decision. To avoid this situation, the current cycle adjustment is adopted, and the next cycle is judged alternately. The clock is stable in the previous cycle when the decision is guaranteed;
  • Figure 4 is the clock decision cycle diagram, the TO cycle is judged, the T1 cycle is counted, and the TO cycle is also counted, but not used;
  • Step 7 Clock extraction control, clock extraction control The difference between the FIFO receiving and transmitting, and the FIFO readable spatial information algorithm to calculate the clock adjustment direction and the adjustment byte amount.
  • the readable space information of the FIFO is used to generate the fine-tuning control of the day clock to ensure that the FIFO works in a safe area.
  • Figure 5 is a flow chart of clock fine tuning. The specific steps for generating the fine-tuning control of the day clock are as follows: the position judgment FIFO is readable in the TO cycle.
  • the difference B between the received data amount and the FIFO transmitted data amount in the TO cycle decision position FTF0 is in the range of the nominal value X ( ⁇ / ⁇ (customer service tolerates maximum frequency offset + 20 ⁇ + redundant frequency offset))
  • the clock is not adjusted, and the adjustment byte amount is 0. If the difference B is within this range, the day clock is adjusted as follows:
  • the adjustment amount is 1; if there is negative adjustment fine adjustment information, the clock adjustment direction is negative adjustment, the adjustment amount is 1; If the information is finely adjusted, it will not be adjusted, and the adjustment amount is 0 ;
  • the adjustment amount is: Receive byte amount - Send byte amount + Positive adjustment fine adjustment information - Negative adjustment fine adjustment Information; If the received byte amount is less than the transmitted byte amount, the clock adjustment direction is negative adjustment, the adjustment amount is: Send byte amount - Receive byte amount - Positive adjustment fine adjustment information + Negative adjustment fine adjustment information;
  • the third step includes the following specific steps: Step 1: Converting the adjustment amount of the day t clock extraction control into a plug-in digital frequency synthesizer The required frequency adjustment control word or the adjustment step of the frequency offset offset; the minimum unit of the adjustment amount of the clock extraction control is byte, and the adjustment step of the frequency adjustment control word or the frequency offset offset is small (the adjustment step assembly causes The clock has a large jitter.
  • the frequency adjustment control word or The adjustment step size of the frequency offset offset is set larger; when the adjustment amount of the clock extraction control is small, the adjustment step of the frequency adjustment control word or the frequency offset offset is set smaller;
  • Step 2 Generate accurate frequency adjustment information required by the external digital frequency synthesizer: First set a customer service nominal frequency adjustment control word or frequency offset offset, the frequency adjustment control word or frequency offset offset is configured through the serial interface to The plug-in digital frequency synthesizer generates a reference customer service clock; then, when there is positive adjustment information, the output frequency adjustment control word or frequency offset offset is the last configured adjustment control word or frequency offset offset ⁇ + ⁇ Adjusting the step size, when there is negative adjustment information, the output frequency adjustment control word or frequency offset offset is the last configured adjustment control word or frequency offset offset by one adjustment step; when there is no adjustment information, the output is not updated. Frequency adjustment control word or frequency offset offset;
  • the output frequency adjustment control word or frequency offset offset should be within the normal range; set a frequency adjustment control word or frequency offset offset maximum value and a minimum value, in the clock adjustment In the calculation, if the calculated frequency adjustment control word or frequency offset offset exceeds the maximum or minimum value (the maximum and minimum values are calculated according to the customer service tolerance frequency offset plus 15ppm redundant frequency offset), the output frequency Adjust the control word or frequency offset to the set maximum or minimum value;
  • Step 3 Configure the calculated frequency adjustment control word or frequency offset offset to the external digital frequency synthesizer chip through a serial interface suitable for the external digital frequency synthesizer, and the external digital frequency synthesizer chip can output accurate customer service.
  • Send the clock the clock extraction method provided by the present invention can effectively extract the client service transmission clock in the 0TN system, so as to implement transparent transmission of the 0TN bearer client service.
  • the foregoing embodiment only describes the implementation method of the client service sending clock extraction in the 0TN system. Other similar service clock extraction methods may also adopt the method, and the present invention is not limited thereto. Set.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the scope of the present invention. within. Content not described in detail in this specification is well known to those skilled in the art.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

La présente invention se rapporte à un procédé servant à extraire une horloge de service client d'un réseau OTN, qui utilise une commande statistique et un synthétiseur de fréquence numérique à connexion externe. Ce procédé comprend les étapes suivantes : 1, utilisation d'une horloge système OTN pour lisser de manière synchrone un service client détramé par un réseau OTN, de façon à ce que les données de service client soient relativement lisses ; 2, collecte du volume de données lissé et comparaison de ce volume et du volume de données transmis par le service client, puis commande des informations de réglage d'horloge au moyen d'un algorithme de pondération utilisé conjointement avec la redondance de cache FIFO ; et 3, conversion des informations de réglage d'horloge en informations de réglage de fréquence précises dont le synthétiseur de fréquence numérique à connexion externe a besoin, puis commande précise dudit synthétiseur de fréquence numérique à connexion externe afin de générer une horloge de transmission de service. Le procédé faisant l'objet de la présente invention est moins complexe et moins coûteux à mettre en place, et le processus d'extraction d'horloge est commandé principalement par les statistiques, sans dépendre de l'état de fonctionnement d'un cache, ce qui le rend sûr et fiable. Le filtrage est réalisé au moment opportun au cours du processus statistique en cas d'anomalie, et aucun effet d'itération ne se produit pendant le cascadage des dispositifs, ce qui donne une meilleure qualité à l'horloge extraite.
PCT/CN2013/079967 2012-08-24 2013-07-24 Procédé servant à extraire une horloge de service client d'un réseau otn WO2014029253A1 (fr)

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