CN111988106B - Synchronization system for single-wire transmission of PPS and TOD information - Google Patents
Synchronization system for single-wire transmission of PPS and TOD information Download PDFInfo
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- CN111988106B CN111988106B CN202010866013.2A CN202010866013A CN111988106B CN 111988106 B CN111988106 B CN 111988106B CN 202010866013 A CN202010866013 A CN 202010866013A CN 111988106 B CN111988106 B CN 111988106B
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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
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0644—External master-clock
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a synchronization system for single-wire transmission of PPS and TOD information, which comprises: a master clock unit and at least one slave clock unit; the master clock unit is connected with the slave clock unit through a data bus single wire; the master clock unit includes: the TOD analysis module and the code sending module; the slave clock unit includes: a receiving and analyzing module; the TOD analysis module is used for analyzing the received data to generate TOD information; the code sending module is used for sending the PPS information to the receiving and analyzing module through the data bus after receiving the PPS information, and then sending the TOD information to the receiving and analyzing module through the data bus after the PPS information is sent; and the receiving and analyzing module is used for receiving the PPS information and receiving TOD information after judging that the PPS information is received. By implementing the embodiment of the invention, the backboard bus/interface resource can be reduced, and the communication stability can be improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a synchronization system for single-wire transmission of PPS and TOD information.
Background
Time synchronization between network devices is required in a TDD communication system. In order to achieve synchronization of the time information, the time signals need to be transmitted to the service boards simultaneously. In the prior art, one mainstream time signal format is: the 1PPS (Pulse Per Second) format is Time Of day (Time information), i.e. each Time signal needs to complete the Time signal transmission Of the 1pps+tod format through two signal lines. And as the equipment capacity is larger and the single board density is higher, the equipment volume requirement is more and more severe. If the communication is transmitted in the backboard system, the backboard bus speed, the bandwidth and the integration level are continuously improved, but the backboard bus resources are limited, the more the number of occupied backboard buses is, the worse the communication stability is. If an external interface (e.g., RF coaxial cable) is used for transmission, two-wire transmission can significantly lead to increased interface volume and increased cost.
Disclosure of Invention
The embodiment of the invention provides a synchronous system for transmitting PPS and TOD information in a single line, which can reduce the bus/interface resources of a backboard and improve the communication stability.
An embodiment of the present invention provides a synchronization system for single-wire transmission of PPS and TOD information, including: comprising the following steps: a master clock unit and at least one slave clock unit; the master clock unit is connected with the slave clock unit through a data bus single wire;
the master clock unit includes: the TOD analysis module and the code sending module;
the slave clock unit includes: a receiving and analyzing module;
the TOD analysis module is used for analyzing the received data to generate TOD information;
the code sending module is used for sending the PPS information to the receiving and analyzing module through the data bus after receiving the PPS information, and then sending the TOD information to the receiving and analyzing module through the data bus after the PPS information is sent;
the receiving and analyzing module is configured to receive the PPS information, and receive the TOD information after determining that the PPS information is received.
Optionally, the master clock unit further includes: a first timer;
the first timer is used for starting timing when the code transmitting module starts transmitting the PPS information and ending timing when a preset first timing time arrives;
the code transmitting module includes: TOD sending module and PPS sending module;
the code sending module sends the PPS information to the receiving and analyzing module through the PPS sending module, judges that the PPS information is sent completely when the first timer is finished, and then sends the TOD information to the receiving and analyzing module through the TOD sending module when the PPS information is judged to be sent completely.
Optionally, the master clock unit further includes: a first timer and a second timer;
the first timer is used for starting timing when the code transmitting module starts transmitting the PPS information and ending timing when a preset first timing time arrives;
the second timer is used for starting timing when the first timer finishes timing, and finishing timing when a preset second timing duration arrives;
the code transmitting module includes: TOD sending module and PPS sending module;
the code sending module sends the PPS information to the receiving and analyzing module through the PPS sending module, judges that the PPS information is sent completely when the first timer is finished, and then sends the TOD information to the receiving and analyzing module through the TOD sending module when the second timer is finished.
Optionally, the code sending module is further configured to resend new PPS information after sending the TOD information to the receiving and parsing module.
Optionally, the slave clock unit further includes a third timer; the receiving and analyzing module comprises: a PPS receiving and judging module and a TOD receiving module;
the third timer is configured to start timing when the PPS reception determination module receives a rising edge or a falling edge of data information, and end timing when the PPS reception determination module receives another edge of the data information, so as to generate a third timing duration;
the PPS reception determination module is configured to compare the third timing duration with a preset reception duration, and determine that the data information is not the PPS information if the third timing duration is not equal to the reception duration, or determine that the data information is the PPS information if the third timing duration is not equal to the reception duration;
and the receiving and analyzing module is used for receiving the TOD information through the TOD receiving module after the PPS receiving and judging module judges that the data information is PPS information.
Optionally, the receiving and analyzing module is further configured to control the PPS receiving and determining module to re-receive the data information after the TOD information is received.
Optionally, the slave clock unit further includes a fourth timer;
the fourth timer is configured to start timing when the TOD receiving module starts receiving the TOD information, and end timing when a preset fourth timing duration arrives;
and the receiving and analyzing module controls the PPS receiving and judging module to re-receive the data information when the fourth timer is finished.
By implementing the embodiment of the invention, the method has the following beneficial effects:
the embodiment of the invention provides a synchronous system for single-wire transmission of PPS and TOD information, which comprises a master clock unit and at least one slave clock unit; the master clock unit is connected with the slave clock unit through a data bus single wire; the main clock unit comprises a TOD analysis module and a code transmitting module; the slave clock unit comprises a receiving and analyzing module; when the system works, the TOD analysis module analyzes the received data to generate TOD information. The code sending module is used for sending the PPS information to the receiving and analyzing module through a data bus after receiving the PPS information, and then sending the TOD information to the receiving and analyzing module through the data bus after the PPS information is sent; the receiving and analyzing module receives the PPS information first, and then receives the TOD information after the PPS information is received. By implementing the embodiment of the invention, the PPS information and the TOD information can be transmitted only through one data bus between the master clock unit and the slave clock unit, so that the wiring cost or the cost of an external interface is saved, the wiring difficulty is reduced, the interference possibility is reduced, and the transmission stability is improved.
Drawings
Fig. 1 is a schematic structural diagram of a synchronization system for single-wire transmission of PPS and TOD information according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a master clock unit according to an embodiment of the invention.
Fig. 3 is a schematic diagram of another structure of a master clock unit according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a master clock unit according to an embodiment of the present invention.
Fig. 5 is a timing diagram of data transmission performed by the master clock unit according to an embodiment of the invention.
Fig. 6 is a schematic flow chart of data transmission by the master clock unit according to an embodiment of the invention.
Fig. 7 is a schematic diagram of a slave clock unit according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of another configuration of a slave clock unit according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of a slave clock unit according to an embodiment of the present invention.
Fig. 10 is a timing diagram of data reception from a clock unit according to an embodiment of the invention.
Fig. 11 is a schematic flow chart of data receiving from a clock unit according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a synchronization system for single-wire transmission of PPS and TOD information, including: a master clock unit and at least one slave clock unit; the master clock unit is connected with the slave clock unit through a data bus single wire;
the master clock unit includes: the TOD analysis module and the code sending module;
the slave clock unit includes: a receiving and analyzing module;
the TOD analysis module is used for analyzing the received data to generate TOD information;
the code sending module is used for sending the PPS information to the receiving and analyzing module through the data bus after receiving the PPS information, and then sending the TOD information to the receiving and analyzing module through the data bus after the PPS information is sent;
the receiving and analyzing module is configured to receive the PPS information, and receive the TOD information after determining that the PPS information is received.
In this embodiment, the master clock unit is disposed on the back board, each slave clock unit is disposed on a respective board, and the master clock unit receives the data sent by the GPS or 1588 server, and then analyzes the TOD information unit through the TOD analysis module. And then, the code sending module receives the 1PPS signal sent by the GPS or 1588 server, then sends the 1PPS signal to the analysis module, and after the 1PPS signal is sent, sends TOD information to the receiving analysis module through the data bus, and the receiving analysis module receives the 1PPS signal and then receives the TOD information. Thereby realizing the transmission of 1PPS+TOD information between the backboard and each veneer through a single data bus.
In an alternative embodiment, as shown in fig. 2, the master clock unit further comprises: a first timer;
the first timer is used for starting timing when the code transmitting module starts transmitting the PPS information and ending timing when a preset first timing time arrives; the code transmitting module includes: TOD sending module and PPS sending module; the code sending module sends the PPS information to the receiving and analyzing module through the PPS sending module, judges that the PPS information is sent completely when the first timer is finished, and then sends the TOD information to the receiving and analyzing module through the TOD sending module when the PPS information is judged to be sent completely.
In this embodiment, the code transmitting module includes: TOD transmitting module and PPS transmitting module, and adds the first timer. And the code transmitting module is used for transmitting the PPS information to the receiving and analyzing module through the PPS transmitting module, judging that the PPS information is transmitted completely when the first timer is finished, and transmitting the TOD information to the receiving and analyzing module through the TOD transmitting module.
In another alternative embodiment, as shown in fig. 3, the master clock unit further comprises: a first timer and a second timer; the first timer is used for starting timing when the code transmitting module starts transmitting the PPS information and ending timing when a preset first timing time arrives; the second timer is used for starting timing when the first timer finishes timing, and finishing timing when a preset second timing duration arrives; the code transmitting module includes: TOD sending module and PPS sending module; the code sending module sends the PPS information to the receiving and analyzing module through the PPS sending module, judges that the PPS information is sent completely when the first timer is finished, and then sends the TOD information to the receiving and analyzing module through the TOD sending module when the second timer is finished.
In this alternative embodiment, a second timer is added in addition to the first timer, and the schematic diagram of the master clock unit is shown in fig. 4. The specific working principle is as follows:
and the TOD analysis module analyzes the data after receiving the data sent by the GPS or 1588 server, and generates TOD information. After the code transmitting module receives the 1PPS signal transmitted by the GPS or 1588 server, the data transmitting operation starts to be performed, and the PPS transmitting module starts to transmit the 1PPS signal first. When the rising edge (or the falling edge) of 1PPS is sent, a first timer is started to perform timing, and when the timing time reaches a preset first timing duration tt1, the first timer finishes timing. At this time, it is determined that 1PPS information is sent out, the bus outputs a low level, the sending bus is switched to the TOD information channel, at the same time, the second timer starts to count, when the timing length reaches a preset second timing time length tt2, the second timer ends to count, at this time, the TOD sending module starts to send TOD information stored by the TOD analyzing module to the receiving analyzing module of the slave clock unit, the TOD information is sent by adopting a serial port protocol, and the baud rate is optional. After the TOD information is sent, the bus keeps outputting a low level, waits for the next rising edge (or falling edge) of the PPS to be sent again, and completes the sending of the 1PPS+TOD information repeatedly. Specific data transmission timing can be seen in fig. 5, and specific data transmission flow can be seen in fig. 6. The delay sending of TOD information can be realized through the second timer, and the mixing of the TOD information and PPS information is avoided, so that data disorder is avoided.
In a preferred embodiment, as shown in fig. 7, the slave clock unit further comprises a third timer; the receiving and analyzing module comprises: a PPS receiving and judging module and a TOD receiving module;
the third timer is configured to start timing when the PPS reception determination module receives a rising edge or a falling edge of data information, and end timing when the PPS reception determination module receives another edge of the data information, so as to generate a third timing duration;
the PPS reception determination module is configured to compare the third timing duration with a preset reception duration, and determine that the data information is not the PPS information if the third timing duration is not equal to the reception duration, or determine that the data information is the PPS information if the third timing duration is not equal to the reception duration;
and the receiving and analyzing module is used for receiving the TOD information through the TOD receiving module after the PPS receiving and judging module judges that the data information is PPS information.
In this embodiment, when the PPS reception determination module receives a rising edge (or a falling edge) of a data message, it starts to count, when another edge of the data message arrives, it ends to count, and records the third timing length tr1 (i.e. the duration of a signal high level or low level), if the third timing length is equal to the preset reception duration (the preferred preset reception duration may be set to the first timing duration tt 1), it determines that the received data message is a 1PPS signal, otherwise, it determines that an invalid signal, the module waits for the occurrence of the 1PPS signal all the time, after the occurrence of the 1PPS signal, the falling edge (or the rising edge) of the 1PPS switches the single reception bus to the TOD reception module, starts to receive and analyze the TOD protocol, and after the transmission of the TOD message is completed, it switches the single line bus to the PPS determination reception module, and completes the reception of the 1pps+tod message all the time.
In another alternative embodiment, as shown in fig. 8, the slave clock unit further comprises a fourth timer;
the fourth timer is configured to start timing when the TOD receiving module starts receiving the TOD information, and end timing when a preset fourth timing duration arrives; and the receiving and analyzing module controls the PPS receiving and judging module to re-receive the data information when the fourth timer is finished.
This embodiment differs from the embodiment shown in fig. 7 in that a fourth timer is added on the basis of the embodiment shown in fig. 7, and the fourth timer starts to count when the TOD receiving module starts to receive the TOD information, and ends to count when a preset fourth time duration tr2 is reached; and when the fourth timer is finished, the receiving and analyzing module controls the PPS receiving and judging module to re-receive the data information. Preferably, tr2 time is greater than TOD transmission time, less than 500ms. That is, in this embodiment, after the transmission of the TOD information is completed, or when the time tr2 of the timer 2 is reached, the single-wire bus is switched from the clock unit to the PPS decision receiving module, and reception of the 1pps+tod information is completed repeatedly. The schematic diagram of the slave clock unit after adding the fourth timer is shown in fig. 9, the timing diagram of the data reception of the slave clock unit is shown in fig. 10, and the flow diagram of the data reception of the slave clock unit is shown in fig. 11.
The invention adopts a single-wire transmission mode, saves wiring cost or cost of an external interface, and has obvious cost on more systems needing master-slave synchronization. Meanwhile, a single-wire transmission mode is adopted, so that wiring difficulty is reduced, interference possibility is reduced, and transmission stability is improved.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (2)
1. A synchronization system for single-wire transmission of PPS and TOD information, comprising: a master clock unit and at least one slave clock unit; the master clock unit is connected with the slave clock unit through a data bus single wire;
the master clock unit includes: the TOD analysis module and the code sending module;
the slave clock unit includes: a receiving and analyzing module;
the TOD analysis module is used for analyzing the received data to generate TOD information;
the code sending module is used for sending the PPS information to the receiving and analyzing module through the data bus after receiving the PPS information, and then sending the TOD information to the receiving and analyzing module through the data bus after the PPS information is sent;
the receiving and analyzing module is used for receiving the PPS information and receiving the TOD information after judging that the PPS information is received;
the master clock unit further includes: a first timer and a second timer;
the first timer is used for starting timing when the code transmitting module starts transmitting the PPS information and ending timing when a preset first timing time arrives;
the second timer is used for starting timing when the first timer finishes timing, and finishing timing when a preset second timing duration arrives;
the code transmitting module includes: TOD sending module and PPS sending module;
the code sending module sends the PPS information to the receiving and analyzing module through the PPS sending module, judges that the PPS information is sent completely when the first timer is finished, then outputs low level when judging that the PPS information is sent completely, switches a sending bus to a TOD information channel, and then sends the TOD information to the receiving and analyzing module through the TOD sending module when the second timer is finished;
the code sending module is further configured to keep the bus outputting a low level after sending the TOD information to the receiving and analyzing module, and wait for resending new PPS information;
the slave clock unit further comprises a third timer; the receiving and analyzing module comprises: a PPS receiving and judging module and a TOD receiving module;
the third timer is configured to start timing when the PPS reception determination module receives a rising edge or a falling edge of data information, and end timing when the PPS reception determination module receives another edge of the data information, so as to generate a third timing duration;
the PPS reception determination module is configured to compare the third timing duration with a preset reception duration, determine that the data information is not the PPS information if the third timing duration is not equal to the reception duration, and wait for the PPS information to appear, otherwise determine that the data information is the PPS information;
the receiving and analyzing module is used for accessing a single receiving bus into the TOD receiving module after the PPS receiving and judging module judges that the data information is PPS information, and receiving the TOD information through the TOD receiving module;
the slave clock unit further comprises a fourth timer;
the fourth timer is configured to start timing when the TOD receiving module starts receiving the TOD information, and end timing when a preset fourth timing duration arrives;
and the receiving analysis module is used for switching the single receiving bus to the PPS receiving judgment module when the fourth timer is finished, and controlling the PPS receiving judgment module to re-receive the data information.
2. The system for synchronizing PPS and TOD information in single-wire transmission according to claim 1, wherein the reception analysis module is further configured to control the PPS reception determination module to re-receive data information after the TOD information is received.
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| CN202010866013.2A CN111988106B (en) | 2020-08-25 | 2020-08-25 | Synchronization system for single-wire transmission of PPS and TOD information |
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| CN111988106B true CN111988106B (en) | 2023-09-05 |
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| CN114414164A (en) * | 2021-12-21 | 2022-04-29 | 山东科技大学 | Pipeline leakage monitoring method and system |
| CN116566535A (en) * | 2023-07-12 | 2023-08-08 | 南京典格通信科技有限公司 | Device and method for analyzing TOD information by hardware in satellite communication network |
| CN117439691A (en) * | 2023-10-23 | 2024-01-23 | 合芯科技有限公司 | Time information synchronization system, processor chip and electronic device |
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| CN107171762A (en) * | 2017-05-09 | 2017-09-15 | 烽火通信科技股份有限公司 | A kind of 1PPS+TOD information monobus transmission synchronization system and method |
| CN109981205A (en) * | 2019-02-22 | 2019-07-05 | 烽火通信科技股份有限公司 | The transmission method and system of 1PPS+TOD signal |
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| EP2928109B1 (en) * | 2012-11-29 | 2017-06-14 | NEC Corporation | Synchronization apparatus, synchronization system, wireless communication apparatus and synchronization method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171762A (en) * | 2017-05-09 | 2017-09-15 | 烽火通信科技股份有限公司 | A kind of 1PPS+TOD information monobus transmission synchronization system and method |
| CN109981205A (en) * | 2019-02-22 | 2019-07-05 | 烽火通信科技股份有限公司 | The transmission method and system of 1PPS+TOD signal |
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