CN114257326A - Time-frequency transmission method and system based on one-way physical isolation - Google Patents
Time-frequency transmission method and system based on one-way physical isolation Download PDFInfo
- Publication number
- CN114257326A CN114257326A CN202111349640.XA CN202111349640A CN114257326A CN 114257326 A CN114257326 A CN 114257326A CN 202111349640 A CN202111349640 A CN 202111349640A CN 114257326 A CN114257326 A CN 114257326A
- Authority
- CN
- China
- Prior art keywords
- time
- frequency
- optical
- unidirectional
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
Abstract
The invention discloses a time-frequency transmission method and a time-frequency transmission system based on one-way physical isolation.S 1, an electro-optical converter converts time and frequency signals of a time-frequency source into time-frequency one-way optical signals; s2, unidirectionally sending the information to a trusted processing unit outside the security domain through optical isolation; s3, the trusted processing unit performs optical/electrical conversion on the accessed unidirectional physically-isolated time frequency signal, processes the signal by combining with a local clock, and transmits the processed time frequency optical signal to a time frequency access end security domain through an output module; s4, the photoelectric converter in the time-frequency access end safety domain converts the unidirectional isolation optical signal output by the trusted processing unit into 1PPS, 10MHz frequency signal, B code and TOD data for the equipment in the network domain; the invention adopts a one-way physical isolation method to transmit time frequency signals across the security domains, and performs security isolation on data transmission between the security domains through the trusted processing unit, thereby ensuring the timeliness of data when the data is transmitted across the security domains.
Description
The technical field is as follows:
the invention relates to the field of network information communication safety, in particular to a time-frequency transmission method based on one-way physical isolation.
Background art:
in application, time frequency signals often need to be traced to a uniform time reference, and the problem of cross-security domain transmission is inevitably faced, the current cross-security domain transmission solution mainly refers to data transmission (data transmission is realized through a transfer server or an encrypted mobile storage medium), the data has no strong timeliness, the current solution does not solve cross-network transmission of time frequency, the transmission delay of time frequency cannot be guaranteed by using the current solution, and the delay requirements of time frequency phase and synchronization need to be solved in the cross-network transmission.
The invention content is as follows:
the technical problem to be solved by the invention is as follows: the existing means can not ensure that data has no strong timeliness and delay problem when the data is transmitted across security domains.
In order to solve the above technical problem, a technical solution provided by the present application is: the time-frequency transmission method based on the one-way physical isolation comprises the following steps:
step one, an electro-optical converter acquires time and frequency signals of a time frequency source in a security domain and converts the time and frequency signals of the time frequency source into time-frequency unidirectional optical signals;
step two, the information is transmitted to a trusted processing unit outside a security domain in a single direction through optical isolation;
thirdly, the trusted processing unit performs optical/electrical conversion on the accessed unidirectional physically-isolated time frequency signal, performs access time frequency traceability state monitoring, time frequency measurement, clock synchronization, signal tracking maintenance, time frequency error correction and traceability optimization operation by combining a local clock, and transmits the processed time frequency optical signal to a time frequency access end security domain through an output module;
and fourthly, deploying a photoelectric converter in the time frequency access end safety domain, unidirectionally receiving the time frequency optical signal sent by the trusted processing unit, converting the signal to generate a 1PPS (pulse per second), 10MHz frequency signal, B code and TOD (time of arrival) data, and outputting the data to other equipment in the network domain.
Further, in the first step, the electrical-to-optical converter is deployed in each security domain of the time-frequency source, converts the 1PPS, the 10MHz frequency signal, the TOD time information of the time-frequency source, or the network-based NTP/PTP source into the time-frequency optical signal, and transmits the time-frequency optical signal to the outside of the security domain in a single direction.
Further, in the third step, the trusted processing unit includes an input module, an output module, a unidirectional isolation processing module, and a configuration maintenance module, and is disposed between the security domains, where the input module and the output module respectively receive or transmit unidirectional physically isolated time-frequency optical signals to the security domains, and complete photoelectric/electro-optical conversion; the one-way isolation processing module is combined with a local clock to realize the access time-frequency tracing state monitoring, clock synchronization, signal tracking and keeping, time-frequency error correction and tracing optimization operation.
Further, in the fourth step, the photoelectric converter is deployed in each time frequency access end security domain, receives the time frequency optical signal sent by the trusted processing unit in a unidirectional manner, and performs photoelectric conversion on the signal to generate a 1PPS, a 10MHz frequency signal, a B code and TOD data for use by other devices in the security domain.
In order to solve the above technical problem, another technical solution provided by the present application is: the time-frequency transmission system based on one-way physical isolation is characterized in that: including photoelectric converter, credible processing unit and photoelectric converter, the photoelectric converter that shows is connected with credible processing unit, and the credible processing unit that shows is connected with photoelectric converter, wherein:
an electro-optical converter: acquiring time and frequency signals of a time frequency source in a security domain, and converting the time and frequency signals of the time frequency source into time-frequency one-way optical signals with one-way physical isolation;
the trusted processing unit: receiving or sending unidirectional physically isolated time frequency optical signals to each security domain through an input module and an output module respectively, and completing photoelectric/electro-optical conversion; the access time-frequency tracing state monitoring, clock synchronization, signal tracking and keeping, time-frequency error correction and tracing optimization operation are realized by combining a local clock;
a photoelectric converter: and the one-way receiving trusted processing unit is used for safely monitoring and processing the time-frequency one-way optical signal, performing photoelectric conversion on the signal, and generating a 1PPS (pulse per second), a 10MHz frequency signal, a B code and TOD (time of day) data to be output.
Further, the trusted processing unit includes an input module, an output module, a unidirectional isolation processing module and a configuration maintenance module, the unidirectional isolation processing module is connected with the configuration maintenance module, the input module and the output module, wherein:
an input module: the time-frequency unidirectional optical signal sent by the unidirectional receiving signal electro-optical converter is sent to the unidirectional isolation processing module after optical/electrical conversion is finished;
the unidirectional isolation processing module: and the received time-frequency unidirectional optical signals are subjected to time frequency source safety tracing, time frequency source state monitoring, time frequency measurement, clock synchronization, signal tracking and maintaining, time frequency error correction, clock source dynamic optimization and time frequency networking operation by combining a local clock.
An output module: receiving the time-frequency unidirectional optical signals processed by the unidirectional isolation processing module and the configuration maintenance module, and sending the time-frequency unidirectional optical signals subjected to unidirectional physical isolation to the photoelectric converter after performing optical/electric conversion;
a configuration maintenance module: and the trusted processing unit is supported to carry out parameter configuration and log query operations through a serial port or a network port.
Furthermore, the number of the input modules is multiple, the number of the output modules is multiple, the number of the electro-optical converters is multiple, and the number of the photoelectric converters is multiple.
The invention has the beneficial effects that:
the time frequency signal is transmitted across the security domains by adopting a unidirectional physical isolation method, the data transmission between the security domains is safely isolated through the trusted processing unit, and only the unidirectional transmission of the time frequency data is allowed. Meanwhile, the trusted processing unit can perform security tracing, time-frequency source state monitoring, time-frequency measurement, synchronization and correction, clock source dynamic optimization and time-frequency networking on the accessed time-frequency signals, has the isolation and exchange capacity of the time-frequency signals, provides reliable security guarantee for cross-security domain transmission of time-frequency transmission, and ensures the timeliness of data when the data is transmitted across security domains.
Description of the drawings:
in order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only two of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a time-frequency transfer method based on unidirectional physical isolation;
fig. 2 is a block diagram of a time-frequency transmission system based on unidirectional physical isolation.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the application discloses a time-frequency transmission method based on one-way physical isolation, step S1, the electrical-to-optical converter obtains time and frequency signals of a time-frequency source in a security domain, and converts the time and frequency signals of the time-frequency source into time-frequency one-way optical signals;
step S2, the information is sent to a trusted processing unit outside the security domain in a single direction through optical isolation;
step S3, the trusted processing unit performs optical/electrical conversion on the accessed unidirectional physically-isolated time frequency signal, performs access time frequency traceability state monitoring, time frequency measurement, clock synchronization, signal tracking and keeping, time frequency error correction and traceability optimization operation by combining a local clock, and transmits the processed time frequency optical signal to a time frequency access end security domain through the output module;
and S4, deploying a photoelectric converter in the time-frequency access end safety domain, and generating 1PPS, 10MHz frequency signals, B codes and TOD data for other equipment in the network domain by the accessed unidirectional optical signals through photoelectric conversion.
In this embodiment, the electrical-to-optical converter is deployed in each security domain of the time-frequency source, converts the 1PPS, 10MHz frequency signal, TOD time information of the time-frequency source, or the network-based NTP/PTP source into a time-frequency optical signal, and transmits the time-frequency optical signal unidirectionally outside the security domain.
In this embodiment, the trusted processing unit includes an input module, an output module, a unidirectional isolation processing module, and a configuration maintenance module, and is disposed between the security domains, where the input module and the output module respectively receive or transmit unidirectional physically isolated time-frequency optical signals to the security domains, and complete photoelectric/electro-optical conversion; the one-way isolation processing module is combined with a local clock to realize the access time-frequency tracing state monitoring, clock synchronization, signal tracking and keeping, time-frequency error correction and tracing optimization operation.
In this embodiment, the optical-to-electrical converter is deployed in each time-frequency access end security domain, receives the time-frequency optical signal sent by the trusted processing unit in a unidirectional manner, and performs optical-to-electrical conversion on the signal to generate a 1PPS, a 10MHz frequency signal, a B code, and TOD data for use by other devices in the security domain.
In order to solve the technical problem, another technical scheme provided by the application is as follows.
Example one
The utility model provides a time frequency transmission system based on one-way physical isolation, includes electro-optical converter, trusted processing unit and photoelectric converter, and shown electro-optical converter is connected with trusted processing unit, and shown trusted processing unit is connected with photoelectric converter, wherein:
an electro-optical converter: and acquiring time and frequency signals of a time frequency source, and converting the time and frequency signals of the time frequency source into time-frequency unidirectional optical signals with unidirectional physical isolation.
The trusted processing unit: receiving or sending unidirectional physically isolated time frequency optical signals to each security domain through an input module and an output module respectively, and completing photoelectric/electro-optical conversion; and the access time-frequency tracing state monitoring, clock synchronization, signal tracking and keeping, time-frequency error correction and tracing optimization operation are realized by combining a local clock.
The trusted processing unit comprises an input module, an output module, a one-way isolation processing module and a configuration maintenance module, wherein the one-way isolation processing module is connected with the configuration maintenance module, the input module and the output module, and the trusted processing unit comprises:
an input module: the time-frequency unidirectional optical signal sent by the electro-optical converter is received in a unidirectional mode, and is sent to a unidirectional isolation processing module after optical/electrical conversion is completed;
the unidirectional isolation processing module and the configuration maintenance module: and the received time-frequency unidirectional optical signals are subjected to time frequency source safety tracing, time frequency source state monitoring, time frequency measurement, clock synchronization, signal tracking and maintaining, time frequency error correction, clock source dynamic optimization and time frequency networking operation by combining a local clock.
A configuration maintenance module: and the trusted processing unit is supported to carry out parameter configuration and log query operations through a serial port or a network port.
An output module: and receiving the time-frequency unidirectional optical signals processed by the unidirectional isolation processing module and the configuration maintenance module, and sending the unidirectional physically isolated time-frequency unidirectional optical signals to the photoelectric converter after performing optical/electric conversion.
A photoelectric converter: and the one-way receiving trusted processing unit is used for safely monitoring and processing the time-frequency one-way optical signal, performing photoelectric conversion on the signal, and generating a 1PPS (pulse per second), a 10MHz frequency signal, a B code and TOD (time of day) data to be output.
In this embodiment, according to different application scenarios of security domain deployment, the electro-optical converter, the optical-to-electrical converter, and the trusted processing unit may be combined in the same device or separately deployed, and transmit the time-frequency optical signal on a single optical fiber in a single direction. An electro-optical converter and a photoelectric converter can be simultaneously deployed in the same security domain, so that input and output of time-frequency optical signals are realized, and the application requirement of time-frequency data bidirectional isolated transmission is met.
The following takes the case where the electro-optical converter, the optical-electrical converter, and the trusted processing unit are separately deployed, and details of the arrangement relationship and the operating state thereof are described.
The arrangement relationship is as follows:
the photoelectric converter is arranged at a time frequency source end in one safety domain, the photoelectric converter is arranged at a time frequency access end in the other safety domain, and the trusted processing unit is arranged between the time frequency source end safety domain and the time frequency access end safety domain and plays a role in connecting the time frequency source end safety domain and the time frequency access end safety domain.
The working state is as follows:
1) the electro-optical converter acquires 1PPS (pulse per second) and 10MHz frequency signals and TOD (time of arrival) time information of a time frequency source in a security domain or a network-based NTP (network time protocol/precision time protocol) source, converts the time and frequency signals of the time frequency source into time-frequency one-way optical signals with one-way physical isolation and sends the time-frequency one-way optical signals out of the domain;
2) the input module receives the time-frequency unidirectional optical signal sent by the electro-optical converter in a unidirectional mode and performs optical/electrical conversion on the received time-frequency unidirectional optical signal;
3) the unidirectional isolation processing module and the configuration maintenance module are combined with a local clock to perform time frequency source safety tracing, time frequency source state monitoring, time frequency measurement, clock synchronization, signal tracking and maintaining, time frequency error correction, clock source dynamic optimization and time frequency networking operation on the time frequency unidirectional optical signal subjected to the optical/electrical conversion;
4) the output module outputs a time-frequency unidirectional optical signal with unidirectional physical isolation after performing electric/optical conversion on the operated time-frequency unidirectional optical signal;
5) and the photoelectric converter receives the time-frequency unidirectional optical signal sent by the output module in a unidirectional manner, performs photoelectric conversion on the signal, generates data such as 1PPS, 10MHz frequency signal, B code, TOD and the like, and outputs the data to the time frequency access end of another security domain for other equipment in the network domain.
Example two
As shown in fig. 2, the present embodiment is obtained by adding the number of technical features such as an input module, an output module, an electro-optical converter, and the like to the first embodiment, and the remaining technical features are the same as the first embodiment, and the same points are not repeated here, and the differences between the second embodiment and the first embodiment are described in detail below: the input module comprises a first input module, a second input module and an nth input module, the output module comprises a first output module, a second output module and an nth output module, the electro-optical converter comprises a first electro-optical converter, a second electro-optical converter and an nth electro-optical converter, and the photoelectric converter comprises a first photoelectric converter, a second photoelectric converter and an nth photoelectric converter.
The first input module is input module 1, the second input module is input module 2 … …, and the nth input module is input module n; the first output module is output module 1, the second output module is output module 2 … …, and the nth output module is output module n; the first electro-optical converter is an electro-optical converter 1, the second electro-optical converter is an electro-optical converter 2 … …, and the nth electro-optical converter is an electro-optical converter n; the first photoelectric converter is the photoelectric converter 1, and the second photoelectric converter is the photoelectric converter 2 … ….
The electro-optical converter 1 is arranged in a time frequency source end security domain 1, the electro-optical converter 2 is arranged in a time frequency source end security domain 2, the electro-optical converter n is arranged in a time frequency source end security domain n, the electro-optical converter 1 is connected with an input module 1, the electro-optical converter 2 is connected with an input module 2, the electro-optical converter n is connected with an input module n, the input module 1, the input module 2 and the input module n are connected with a one-way isolation processing module, the one-way isolation processing module is connected with an output module 1, output module 2 and output module n are connected, and output module 1 is connected with photoelectric converter 1, and output module 2 is connected with photoelectric converter 2, and output module n is connected with photoelectric converter n, and photoelectric converter 1 deploys in time frequency incoming end safety domain A, and photoelectric converter 2 deploys in time frequency incoming end safety domain B, and photoelectric converter n deploys in time frequency incoming end safety domain X.
The system comprises a time frequency source end security domain 1, an electro-optical converter 1, an input module 1, a unidirectional isolation processing module, an output module 1, an electro-optical converter 1 and a time frequency access end security domain A, wherein a first unidirectional transmission channel is formed; a second unidirectional transmission channel is formed by the time frequency source end security domain 2, the electro-optical converter 2, the input module 2, the unidirectional isolation processing module, the output module 2, the electro-optical converter 2 and the time frequency access end security domain B; the time frequency source end security domain n, the electro-optical converter n, the input module n, the unidirectional isolation processing module, the output module n, the electro-optical converter n and the time frequency access end security domain X form an nth unidirectional transmission channel; the first unidirectional transmission path, the second unidirectional transmission path and the nth unidirectional transmission path are mutually independent and work in the same way.
The operation of the present embodiment will be described in detail below by taking the first unidirectional transmission path as an example.
1) The electro-optical converter 1 acquires time and frequency signals of a time frequency source in a time frequency source end security domain 1, and converts the time and frequency signals of the time frequency source into time-frequency unidirectional optical signals with unidirectional physical isolation;
2) the input module 1 unidirectionally receives the time-frequency unidirectional optical signal sent by the electro-optical converter 1 and performs optical/electrical conversion on the received time-frequency unidirectional optical signal;
3) the unidirectional isolation processing module is combined with a local clock to carry out time frequency source safety tracing, time frequency source state monitoring, time frequency measurement, clock synchronization, signal tracking and maintaining, time frequency error correction, clock source dynamic optimization and time frequency networking operation on the time frequency unidirectional electrical signal subjected to the optical/electrical conversion;
4) the output module 1 performs electric/optical conversion on the operated time-frequency unidirectional electrical signal and outputs a unidirectional physically-isolated time-frequency unidirectional optical signal;
5) and the photoelectric converter 1 unidirectionally receives the time-frequency unidirectional optical signal which is sent to the time frequency access end security domain A by the output module 1, performs optical/electrical conversion on the signal, generates a 1PPS (pulse per second), a 10MHz frequency signal, a B code and TOD (time of arrival) data and outputs the signal.
The foregoing description of the various embodiments is intended to highlight various differences between the embodiments, and the same or similar parts may be referred to each other, and for brevity, will not be described again herein.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (7)
1. A time-frequency transmission method based on unidirectional physical isolation comprises the following steps:
step one, an electro-optical converter acquires time and frequency signals of a time frequency source in a security domain and converts the time and frequency signals of the time frequency source into time-frequency unidirectional optical signals;
step two, the information is transmitted to a trusted processing unit outside a security domain in a single direction through optical isolation;
thirdly, the trusted processing unit performs optical/electrical conversion on the accessed unidirectional physically-isolated time frequency signal, performs access time frequency traceability state monitoring, time frequency measurement, clock synchronization, signal tracking maintenance, time frequency error correction and traceability optimization operation by combining a local clock, and transmits the processed time frequency optical signal to a time frequency access end security domain through an output module;
and fourthly, deploying a photoelectric converter in the time frequency access end safety domain, unidirectionally receiving the time frequency optical signal sent by the trusted processing unit, converting the signal to generate a 1PPS (pulse per second), 10MHz frequency signal, B code and TOD (time of arrival) data, and outputting the data to other equipment in the network domain.
2. The time-frequency transmission method based on unidirectional physical isolation as claimed in claim 1, wherein: in the first step, the electro-optical converter is deployed in each safety domain of a time frequency source end, converts 1PPS, 10MHz frequency signals, TOD time information of a time frequency source or a network-based NTP/PTP source into time frequency optical signals, and transmits the time frequency optical signals to the outside of the safety domain in a single direction.
3. The time-frequency transmission method based on unidirectional physical isolation as claimed in claim 1, wherein: in the third step, the trusted processing unit comprises an input module, an output module, a unidirectional isolation processing module and a configuration maintenance module, and is deployed between the security domains, wherein the input module and the output module respectively receive or send unidirectional physically isolated time frequency optical signals to the security domains and complete photoelectric/electro-optical conversion; the one-way isolation processing module is combined with a local clock to realize the access time-frequency tracing state monitoring, clock synchronization, signal tracking and keeping, time-frequency error correction and tracing optimization operation.
4. The time-frequency transmission method based on unidirectional physical isolation as claimed in claim 1, wherein: in the fourth step, the photoelectric converter is deployed in each time frequency access end security domain, receives the time frequency optical signal sent by the trusted processing unit in a unidirectional mode, performs photoelectric conversion on the signal, and generates 1PPS, 10MHz frequency signal, B code and TOD data for other devices in the security domain.
5. The utility model provides a time frequency transmission system based on one-way physical isolation which characterized in that: including photoelectric converter, credible processing unit and photoelectric converter, the photoelectric converter that shows is connected with credible processing unit, and the credible processing unit that shows is connected with photoelectric converter, wherein:
an electro-optical converter: acquiring time and frequency signals of a time frequency source in a security domain, and converting the time and frequency signals of the time frequency source into time-frequency one-way optical signals with one-way physical isolation;
the trusted processing unit: receiving or sending unidirectional physically isolated time frequency optical signals to each security domain through an input module and an output module respectively, and completing photoelectric/electro-optical conversion; the access time-frequency tracing state monitoring, clock synchronization, signal tracking and keeping, time-frequency error correction and tracing optimization operation are realized by combining a local clock;
a photoelectric converter: and the one-way receiving trusted processing unit is used for safely monitoring and processing the time-frequency one-way optical signal, performing photoelectric conversion on the signal, and generating a 1PPS (pulse per second), a 10MHz frequency signal, a B code and TOD (time of day) data to be output.
6. The time-frequency transmission system based on one-way physical isolation as claimed in claim 5, wherein: the trusted processing unit comprises an input module, an output module, a one-way isolation processing module and a configuration maintenance module, wherein the one-way isolation processing module is connected with the configuration maintenance module, the input module and the output module, and the trusted processing unit comprises:
an input module: the time-frequency unidirectional optical signal sent by the unidirectional receiving signal electro-optical converter is sent to the unidirectional isolation processing module after optical/electrical conversion is finished;
the unidirectional isolation processing module: the method comprises the steps of performing time frequency source safety tracing, time frequency source state monitoring, time frequency measurement, clock synchronization, signal tracking and maintaining, time frequency error correction, clock source dynamic optimization and time frequency networking operation on received time frequency unidirectional optical signals by combining a local clock;
an output module: receiving the time-frequency unidirectional optical signals processed by the unidirectional isolation processing module and the configuration maintenance module, and sending the time-frequency unidirectional optical signals subjected to unidirectional physical isolation to the photoelectric converter after performing optical/electric conversion;
a configuration maintenance module: and the trusted processing unit is supported to carry out parameter configuration and log query operations through a serial port or a network port.
7. The time-frequency transmission system based on one-way physical isolation according to claim 6, wherein: the photoelectric converter comprises a plurality of input modules, a plurality of output modules, a plurality of electro-optical converters and a plurality of photoelectric converters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111349640.XA CN114257326A (en) | 2021-11-15 | 2021-11-15 | Time-frequency transmission method and system based on one-way physical isolation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111349640.XA CN114257326A (en) | 2021-11-15 | 2021-11-15 | Time-frequency transmission method and system based on one-way physical isolation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114257326A true CN114257326A (en) | 2022-03-29 |
Family
ID=80792512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111349640.XA Pending CN114257326A (en) | 2021-11-15 | 2021-11-15 | Time-frequency transmission method and system based on one-way physical isolation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114257326A (en) |
-
2021
- 2021-11-15 CN CN202111349640.XA patent/CN114257326A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2007228579A (en) | Interface apparatus for connecting master base station with radio remote unit | |
| CN111602349B (en) | Method, device and system for time synchronization | |
| US9025964B2 (en) | Receiver, data identifying and reproducing apparatus, pon system, and data identifying and reproducing method | |
| RU2012117982A (en) | METHOD AND SYSTEM OF WIRELESS CONTROL OF SWITCHING DEVICES OF POWER SUPPLY NETWORK | |
| IL164037A (en) | Synchronization system for all optical slotted ring dynamic networks | |
| WO2020109867A3 (en) | Multi-mode communication device, method and system | |
| CN108134645A (en) | Radar signal synchronization system | |
| CN112751639B (en) | Time synchronization method, communication equipment and system | |
| EP3890218A1 (en) | Timestamp acquisition method and time synchronization system | |
| CN110708135B (en) | Communication control system and method of passive optical network | |
| CN114257326A (en) | Time-frequency transmission method and system based on one-way physical isolation | |
| CN114788197A (en) | Method for optimizing time synchronization between network devices connected via a communication network | |
| US20090148167A1 (en) | Communication apparatus and signal transmitting method | |
| JP2016072851A (en) | PON system, OLT, ONU and transmission method | |
| GB2425695A (en) | Compensating for internal delays within nodes and transmission delays between the nodes | |
| JP2016119521A (en) | Pon (passive optical network) system, olt (optical line terminal), and transmission method | |
| CN102201851B (en) | Remote clock system, equipment and information transmission method | |
| CN208128259U (en) | A kind of multi-channel digital power amplification system based on Dante network connection | |
| KR101764652B1 (en) | Remote contact monitoring apparatus and method thereof | |
| DK1573994T3 (en) | System and method for communicating digital information using time and frequency defined basic functions | |
| CN107493600B (en) | Massive MIMO communication device and synchronization method | |
| CN111106891A (en) | Relative time synchronization method, device and system | |
| Wu et al. | Real-time Ethernet based on passive optical networks | |
| CN116301199B (en) | Signal generation system and method | |
| CN104219636A (en) | Radio broadcasting system based on ZigBee protocol |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |