CN113835335B - Clock synchronization method and system based on optical unidirectional transmission - Google Patents
Clock synchronization method and system based on optical unidirectional transmission Download PDFInfo
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- CN113835335B CN113835335B CN202111146132.1A CN202111146132A CN113835335B CN 113835335 B CN113835335 B CN 113835335B CN 202111146132 A CN202111146132 A CN 202111146132A CN 113835335 B CN113835335 B CN 113835335B
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Abstract
The invention provides a clock synchronization method and a clock synchronization system based on optical unidirectional transmission, wherein the method comprises the following steps: judging whether data to be transmitted exist in a current transmission channel or not; if yes, converting the data to be transmitted into 8b/10b coded data through a data transmitting end, embedding a clock signal, and transmitting the data to a data receiving end; after receiving the data, the data receiving end extracts a clock signal from the data and performs clock synchronization with the data transmitting end; if not, the request of reconnecting the channel link is initiated to the data receiving end at regular time through the data sending end, the channel link is re-established after the data receiving end receives the request, and clock synchronization is performed. The invention can automatically establish clock synchronization between the data transmitting end and the data receiving end, thereby avoiding communication errors caused by synchronization problems.
Description
Technical Field
The invention relates to the technical field of data transmission, in particular to a clock synchronization method and system based on optical unidirectional transmission.
Background
With the rapid development of global informatization, network information systems play an increasing role in various industries, and the problem of security of network information is increasingly prominent. The office of the internal and external networks is a trend due to the requirements of network security and information confidentiality; in order to meet the application requirement of unidirectional transmission from the office external network to the office internal network, an optical unidirectional transmission method is provided based on the unidirectional transmission principle of light: the data of the sending end (external network equipment) is converted into optical signals through the optical module, the optical signals are transmitted to the receiving end in a unidirectional mode through the optical fibers, and the receiving end (internal network equipment) converts the optical signals into corresponding data, so that unidirectional data transmission from the external network equipment to the internal network equipment is realized through an optical unidirectional transmission method.
The normal data transmission needs a synchronization mechanism between a data transmitting end and a receiving end; however, in the unidirectional transmission mode, a feedback channel transmitted from the receiving end to the transmitting end is not allowed to exist, that is, a loop-back link cannot be formed, so that the transmitting end cannot receive the feedback signal of the receiving end, that is, synchronization of the receiving end and the transmitting end is difficult to complete. The transmitting end cannot know whether the data has errors in the transmission process, and once the communication errors occur in unidirectional transmission, the transmitting end and the receiving end must be restarted to recover normal operation.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a clock synchronization method and a clock synchronization system based on optical unidirectional transmission, which can enable a data transmitting end and a data receiving end to automatically establish clock synchronization, thereby avoiding communication errors caused by synchronization problems.
The invention aims to achieve the aim, and the aim is achieved by the following technical scheme:
a clock synchronization method based on optical unidirectional transmission, comprising:
judging whether data to be transmitted exist in a current transmission channel or not;
if yes, converting the data to be transmitted into 8b/10b coded data through a data transmitting end, embedding a clock signal, and transmitting the data to a data receiving end; after receiving the data, the data receiving end extracts a clock signal from the data and performs clock synchronization with the data transmitting end;
if not, the request of reconnecting the channel link is initiated to the data receiving end at regular time through the data sending end, the channel link is re-established after the data receiving end receives the request, and clock synchronization is performed.
Further, the data to be transmitted is converted into 8b/10b encoded data by the data transmitting end, embedded into a clock signal, and transmitted to the data receiving end, which specifically includes:
at the data transmitting end, the 8b/10b encoder is used for converting the data to be transmitted into the 10bit 8b/10b encoded data with DC balance, a comma control character is inserted, namely a synchronous signal is embedded, the 10bit encoding result is converted into a serial code through parallel-serial conversion, and finally the serial code stream is converted into a differential signal, and the differential signal is transmitted to the data receiving end through an optical fiber data transmission channel.
Further, after the data receiving end receives the data, a clock signal is extracted from the data to perform clock synchronization with the data transmitting end, which specifically comprises:
at the data receiving end, the received differential signals are restored into serial signals, clock signals are extracted from the serial signals through a clock recovery circuit, and sampling of serial data is completed;
performing 8b/10b decoding to restore the serial data into 8bit format data;
and detecting the comm characters in the 8-bit format data by a comm detector, and performing clock synchronization with a data transmitting end by data boundary alignment.
Further, the method includes the steps that the request of reconnecting the channel link is sent to the data receiving end at regular time through the data sending end, the channel link is reestablished after the data receiving end receives the request, and clock synchronization is carried out, specifically comprising the following steps:
setting a request initiation time using a timer;
initiating a reconnection channel link request to a data receiving end at the data transmitting end according to the request initiating time at regular time; after receiving the request, the data receiving end sequentially performs channel link initialization, channel link binding and channel link verification, and the verification is passed to finish the reconstruction of the channel link and clock synchronization; if the verification is not passed, the channel initialization is continued.
Further, the channel link initialization is specifically:
initializing a serial channel link, and determining channel width, channel link speed, channel communication mode, channel allocation and data size end mode;
channel links are activated and channel boundaries are aligned.
Further, the channel link binding specifically includes:
and binding the channel links with the corresponding optical fiber channels.
Further, the channel link verification includes:
data to be mapped to a user interface are aligned and clock synchronization is carried out;
checking the integrity of the channel link signal;
judging whether the data transmission capacity of the current channel link reaches a preset transmission capacity or not;
if yes, the current channel link is verified through the channel link.
Correspondingly, the invention also discloses a clock synchronization system based on optical unidirectional transmission, which comprises: a judging unit, configured to judge whether data to be transmitted exists in the current transmission channel;
the transmitting unit is used for converting the data to be transmitted into 8b/10b coded data through the data transmitting end, embedding a clock signal and transmitting the data to the data receiving end;
the synchronous unit is used for extracting a clock signal from the data after the data receiving end receives the data and carrying out clock synchronization with the data transmitting end;
and the channel link reestablishment unit is used for initiating a request for reconnecting the channel link to the data receiving end at regular time through the data sending end, reestablishing the channel link after the data receiving end receives the request, and performing clock synchronization.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a clock synchronization method and a system based on optical unidirectional transmission, which specifically adopts the steps that data from a data transmitting end to a data receiving end are encoded by 8b/10b, clock signals are embedded into the data, and when the data transmission exists, the receiving end extracts the clock signals from the transmitted data, so that the clock synchronization with the transmitting end is completed; when the transmission is idle, the data receiving end cannot extract the clock signal to complete clock synchronization because of no data transmission, and in this case, a timer is set to enable the data transmitting end to initiate a request of reconnecting the channel link at fixed time, and the receiving end reestablishes the transmission channel link after receiving the request to complete clock synchronization; in the optical unidirectional transmission equipment, the invention can automatically establish clock synchronization between the transmitting end and the receiving end, thereby avoiding communication errors caused by synchronization problems.
It can be seen that the present invention has outstanding substantial features and significant advances over the prior art, as well as the benefits of its implementation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the method of the present invention;
fig. 2 is a system configuration diagram of the present invention.
In the figure, 1 is a judging unit, 2 is a transmitting unit, 3 is a synchronizing unit, 4 is a channel link reconstructing unit, 41 is a channel link initializing module, 42 is a channel link binding module, 43 is a channel link verifying module, and 44 is a timer.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
The clock synchronization method based on optical unidirectional transmission as shown in fig. 1 comprises the following steps:
s1: judging whether data to be transmitted exist in a current transmission channel or not; if yes, go to step S2, otherwise go to step S4.
S2: the data to be transmitted is converted into 8b/10b coded data through the data transmitting end, embedded into a clock signal and transmitted to the data receiving end. After completion, the process goes to step S3.
The method specifically comprises the following steps: at a data transmitting end, firstly, an 8b/10b encoder is used for converting data to be transmitted into 10-bit 8b/10b encoded data with direct current balance, then a comma control character, namely an embedded synchronous signal, is inserted, and a 10-bit encoding result is converted into a serial code through parallel-serial conversion. And finally, converting the serial code stream into a differential signal, and transmitting the differential signal to a data receiving end through an optical fiber data transmission channel.
The 8B/10B coding technology is a common coding and decoding technology in high-speed communication, expands 8bit codes into 10bit codes, and inserts synchronous signals, wherein code combinations comprise 256 data character codes and 12 control character codes which are respectively marked as Dx.y and Kx.y. By careful selection of the coding method, different optimization characteristics can be obtained, which ensure that the relative balance of the number of "0" symbols and "1" symbols is consistent, also known as DC balance; the data synchronization is ensured to be easy to realize, and the difficulty of clock recovery is simplified. The 8B/10B codes use K28.1, K28.5 and K28.7 as the control characters of the K code, called "comma". The comma only appears as a control character and does not appear in the data payload portion, so that the comma character can be used to indicate the start and end marks of the frame, or the control character for aligning the data stream, so that the clock signal can be conveniently extracted, and the clock synchronization can be completed.
S3: after the data receiving end receives the data, a clock signal is extracted from the data, and clock synchronization with the data transmitting end is carried out.
Specifically, at a data receiving end, the received differential signals are restored into serial signals, clock signals are extracted from the serial signals through a clock recovery circuit, and sampling of serial data is completed; then 8b/10b decoding is carried out to restore the serial data into 8bit format data. Since the comma characters are used as control characters for alignment of data streams in 8B/10B decoding, the comma characters in the 8bit format data are detected finally by a comma detector, and clock synchronization with a data transmitting end is performed through alignment of data boundaries.
S4: and initiating a request for reconnecting the channel link to the data receiving end at regular time by the data sending end, re-establishing the channel link after the data receiving end receives the request, and performing clock synchronization.
Under the condition of idle transmission, as no data is transmitted, the data receiving end cannot complete clock synchronization through data extraction clock signals, and channel link disconnection may be caused, in this case, a timer needs to be set to enable the data transmitting end to initiate a reconnection channel link request at fixed time, and the channel link is recovered after the data receiving end receives the request, including initializing the channel link, aligning the channel link boundary, binding the channel link and verifying the channel link, if the verification is passed, the channel link reconstruction and the clock synchronization are completed, and if the verification is not passed, the channel initialization is returned to restart. The specific implementation process is as follows:
1. channel link initialization: initializing a serial channel link, determining a channel link width, a channel link rate, a channel link communication mode, a channel link allocation and a data size end mode, activating a channel link, and aligning channel link boundaries.
2. Channel link binding: channel links are bound to corresponding fibre channels, which can be seen as a network of link layers and use a unified address space throughout the network, the channel link binding helping to eliminate signal skew due to factors such as trace length and interfacing.
3. And (3) channel link verification: for received data that needs to be mapped to the user interface, this process performs data alignment and clock synchronization, checks the integrity of the channel signal, and finally verifies the channel link's ability to transmit valid data. Once channel verification is complete, meaning that channel link reestablishment and clock synchronization have been completed, the channel link is now available for transmitting data.
4. The design of the timer needs to consider the specific conditions of the channel link, such as clock rate, channel delay, offset between channels, noise and other parameters; the average time required for synchronization should be balanced against the maximum time that the system can tolerate the channel not operating to determine the optimal timing synchronization time.
The embodiment provides a clock synchronization method based on optical unidirectional transmission, which can enable a data transmitting end and a data receiving end to automatically establish clock synchronization, and effectively avoid communication errors caused by synchronization problems.
Correspondingly, as shown in fig. 2, the invention also discloses a clock synchronization system based on optical unidirectional transmission, which comprises: a decision unit 1, a transmission unit 2, a synchronization unit 3 and a channel link reconstruction unit 4.
A judging unit 1, configured to judge whether data to be transmitted exists in a current transmission channel; if yes, starting the sending unit 2; if not, the channel link reestablishing unit 4 is started.
And the sending unit 2 is used for converting the data to be transmitted into 8b/10b coded data through the data sending end, embedding a clock signal and sending the 8b/10b coded data to the data receiving end.
And the synchronizing unit 3 is used for extracting a clock signal from the data after the data receiving end receives the data and synchronizing the clock signal with the data transmitting end.
And the channel link reestablishment unit 4 is used for initiating a request of reconnecting the channel link to the data receiving end at regular time through the data sending end, reestablishing the channel link after the data receiving end receives the request, and performing clock synchronization.
The channel link reestablishing unit 4 specifically includes:
a channel link initializing module 41, configured to initialize a serial channel link, and determine a channel width, a rate of the channel link, a channel communication mode, a channel allocation, and a size end mode of data; channel links are activated and channel boundaries are aligned.
And a channel link binding module 42, configured to bind the channel link with the corresponding fiber channel.
A channel link verification module 43, configured to align data to be mapped to the user interface and synchronize clocks; and checking the integrity of the channel link signal, and judging whether the data transmission capacity of the current channel link reaches the preset transmission capacity.
A timer 44 for setting the initiation time of the reconnection channel link request.
The embodiment provides a clock synchronization system based on optical unidirectional transmission, firstly, data from a data transmitting end to a data receiving end are encoded by 8b/10b, clock signals are embedded into the data, and when the data transmission exists, the receiving end extracts the clock signals from the transmitted data, so that clock synchronization with the transmitting end is completed; when the transmission is idle, the data receiving end cannot extract the clock signal to complete clock synchronization because of no data transmission, in this case, the data transmitting end periodically initiates a request of reconnecting the channel link through the timer, and the receiving end reestablishes the transmission channel link after receiving the request to complete clock synchronization; in the optical unidirectional transmission equipment, the system can automatically establish clock synchronization between a transmitting end and a receiving end, thereby avoiding communication errors caused by synchronization.
It will be apparent to those skilled in the art that the techniques of embodiments of the present invention may be implemented in software plus a necessary general purpose hardware platform. Based on such understanding, the technical solution in the embodiments of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium such as a U-disc, a mobile hard disc, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk or an optical disk, etc. various media capable of storing program codes, including several instructions for causing a computer terminal (which may be a personal computer, a server, or a second terminal, a network terminal, etc.) to execute all or part of the steps of the method described in the embodiments of the present invention. The same or similar parts between the various embodiments in this specification are referred to each other. In particular, for the terminal embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference should be made to the description in the method embodiment for relevant points.
In the several embodiments provided by the present invention, it should be understood that the disclosed systems, and methods may be implemented in other ways. For example, the system embodiments described above are merely illustrative, e.g., the division of the elements is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, system or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional module in the embodiments of the present invention may be integrated in one processing unit, or each module may exist alone physically, or two or more modules may be integrated in one unit.
Similarly, each processing unit in the embodiments of the present invention may be integrated in one functional module, or each processing unit may exist physically, or two or more processing units may be integrated in one functional module.
The invention will be further described with reference to the accompanying drawings and specific embodiments. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it will be understood that various changes or modifications may be made by those skilled in the art after reading the teachings of the invention, and such equivalents are intended to fall within the scope of the invention as defined herein.
Claims (6)
1. A clock synchronization method based on optical unidirectional transmission, comprising:
judging whether data to be transmitted exist in a current transmission channel or not;
if yes, converting the data to be transmitted into 8b/10b coded data through a data transmitting end, embedding a clock signal, and transmitting the data to a data receiving end; after receiving the data, the data receiving end extracts a clock signal from the data and performs clock synchronization with the data transmitting end;
if not, setting request initiation time by using a timer;
initiating a reconnection channel link request to a data receiving end at the data transmitting end according to the request initiating time at regular time;
after receiving the request, the data receiving end sequentially performs channel link initialization, channel link binding and channel link verification, and the verification is passed to finish the reconstruction of the channel link and clock synchronization; if the verification is not passed, the channel initialization is continued.
2. The clock synchronization method based on unidirectional optical transmission of claim 1, wherein the data to be transmitted is converted into 8b/10b encoded data by the data transmitting end, embedded in a clock signal, and transmitted to the data receiving end, specifically comprising:
at the data transmitting end, the 8b/10b encoder is used for converting the data to be transmitted into the 10bit 8b/10b encoded data with DC balance, a comma control character is inserted, namely a synchronous signal is embedded, the 10bit encoding result is converted into a serial code through parallel-serial conversion, and finally the serial code stream is converted into a differential signal, and the differential signal is transmitted to the data receiving end through an optical fiber data transmission channel.
3. The method for synchronizing clock based on unidirectional optical transmission of claim 2, wherein the data receiving end extracts a clock signal from the data after receiving the data, and performs clock synchronization with the data transmitting end, specifically comprising:
at the data receiving end, the received differential signals are restored into serial signals, clock signals are extracted from the serial signals through a clock recovery circuit, and sampling of serial data is completed;
performing 8b/10b decoding to restore the serial data into 8bit format data;
and detecting the comm characters in the 8-bit format data by a comm detector, and performing clock synchronization with a data transmitting end by data boundary alignment.
4. The clock synchronization method based on optical unidirectional transmission according to claim 1, wherein the channel link initialization is specifically:
initializing a serial channel link, and determining channel width, channel link speed, channel communication mode, channel allocation and data size end mode;
channel links are activated and channel boundaries are aligned.
5. The clock synchronization method based on optical unidirectional transmission of claim 1, wherein the channel link binding specifically comprises:
and binding the channel links with the corresponding optical fiber channels.
6. The optical unidirectional transmission-based clock synchronization method of claim 1, wherein said channel link verification comprises:
data to be mapped to a user interface are aligned and clock synchronization is carried out;
checking the integrity of the channel link signal;
judging whether the data transmission capacity of the current channel link reaches a preset transmission capacity or not;
if yes, the current channel link is verified through the channel link.
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| CN103825696A (en) * | 2014-03-11 | 2014-05-28 | 华中科技大学 | Device for realizing high-speed real-time communication by optical fibers based on FPGA (Field Programmable Gate Array) |
| CN109815099A (en) * | 2018-12-28 | 2019-05-28 | 北京时代民芯科技有限公司 | The FPGA verification method of JESD204B controller |
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| JP2010212804A (en) * | 2009-03-06 | 2010-09-24 | Sony Corp | Communication device and communication method, computer program, and communication system |
| CN102752184A (en) * | 2011-04-20 | 2012-10-24 | 河海大学 | Data communication system for real-time multicast service and method thereof |
| CN109982364B (en) * | 2019-02-27 | 2022-05-03 | 京信网络系统股份有限公司 | Link self-recovery method, device, terminal system and storage medium |
| CN112787775B (en) * | 2019-11-10 | 2023-02-10 | 华为技术有限公司 | Method and device for sending feedback information |
| CN111294299B (en) * | 2020-02-10 | 2022-10-18 | 南京理工大学 | Serdes link transmission method based on K codes |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825696A (en) * | 2014-03-11 | 2014-05-28 | 华中科技大学 | Device for realizing high-speed real-time communication by optical fibers based on FPGA (Field Programmable Gate Array) |
| CN109815099A (en) * | 2018-12-28 | 2019-05-28 | 北京时代民芯科技有限公司 | The FPGA verification method of JESD204B controller |
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