CN110958504A - High-stability high-reliability time frequency network implementation method based on optical fiber ring network architecture - Google Patents
High-stability high-reliability time frequency network implementation method based on optical fiber ring network architecture Download PDFInfo
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- CN110958504A CN110958504A CN201911289321.7A CN201911289321A CN110958504A CN 110958504 A CN110958504 A CN 110958504A CN 201911289321 A CN201911289321 A CN 201911289321A CN 110958504 A CN110958504 A CN 110958504A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
Abstract
The invention discloses a high-stability high-reliability time frequency network implementation method based on an optical fiber ring network framework, and relates to a high-stability high-reliability time service and time synchronization network implementation method under the demand of time use of a plurality of subsystems of various system platforms such as land-based, shipborne and vehicle-mounted systems. The method comprises the following steps: the method comprises the following steps of basic configuration and establishment of the ring-shaped networking, autonomous selection of an optimal path of a time service link, redundancy backup and autonomous switching design. The invention can meet the requirements of high-reliability, large-span, multi-node and networked time-frequency signal transmission, synchronization, distribution and time service continuously promoted by various system platforms, so that the whole platform works in a uniform, stable and reliable time dimension, and high-precision synchronization and linkage work among equipment units of the platform are realized, thereby improving the combined operation capability of the system.
Description
Technical Field
The invention relates to the field of time-frequency synchronization under an optical fiber ring network architecture, in particular to the problem of high-stability, high-reliability and time-service and time synchronization network construction under the time-service requirement of a plurality of subsystems of various system platforms such as land-based, shipborne and vehicle-mounted platforms.
Background
Under the informatization condition of various system platforms such as land-based, shipborne and vehicle-mounted systems, the time information plays a fundamental, fundamental and guaranteed role in the joint operation of various subsystem equipment units of the platform, and the premise of implementing the joint operation of various equipment units is that the equipment units must work under a unified, stable and reliable time dimension. Therefore, it is necessary to construct a highly stable and highly reliable time-frequency synchronization network to ensure the orderly, continuous, consistent and cooperative application of each link of command and control instruction receiving, processing and distribution, signal receiving, signal transmission and the like, and to realize high-precision synchronization and linkage work among all devices.
The construction significance of the time-frequency synchronous network aims to provide continuous, stable and reliable time-frequency signals for various system platforms, the traditional time-frequency synchronous network structure is that various time-frequency signals are generated through a single time-frequency reference source and then are transmitted to various subsystem equipment units of the platform through optical cables or radio frequency cables, the structure has the obvious defects that ① reference equipment is single equipment, once the equipment fails, the whole time-frequency network is paralyzed, the system cannot normally and orderly work due to loss of time information, joint operation capability is seriously braked, ② time-frequency signals are attenuated and deteriorated along with the increase of transmission distance, reliability and stability are greatly reduced, ③ single equipment has limited output capability and cannot meet the application of large-span and multi-node system platforms.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a method for implementing a high-stability, high-reliability time-frequency network based on an optical fiber ring network architecture, so as to avoid the drawbacks of the background art. The method is reasonable in design and not complex, and can solve the problem that the traditional time frequency network architecture outputting the distributed time frequency signals based on the single time frequency reference source cannot meet the requirements of high reliability, large span, multiple nodes and networking time frequency.
The technical scheme adopted by the invention is as follows:
a method for realizing high-stability and high-reliability time frequency network based on optical fiber ring network architecture comprises the following steps
(1) Two hosts and a plurality of slave machines are cascaded and networked in a mode of optical fiber cascade loop networking, one host is selected as a master host, and after networking, each node device respectively carries out networking information interaction to complete basic information configuration of a ring network; wherein, the host and the slave in the ring network are called node equipment;
(2) after each node device in the ring network is powered on, the node information, the node device information on an uplink and the node device information on a downlink which are connected with the node device are mutually transmitted, and each node device respectively acquires the information of all the node devices on the whole network;
(3) each node device in the ring network selects the nearest cascade time frequency synchronous link with the main host computer to carry out time synchronization and tracing through an optimal path selection method, so as to form a complete annular time frequency synchronous network;
(4) the master host generates a time-frequency reference source, and each slave receives the time-frequency reference source output by the master host through the ring network, synchronously generates and shunts and outputs a time-frequency signal.
Each node device in the ring network is configured with an optical fiber cascade module, the cascade module is internally provided with two optical ports, the optical ports support PTP masters or slaves, the cascade optical ports are configured adaptively according to networking conditions, and the optical ports are communicated with connected devices through uplinks or downlinks.
Wherein, its characterized in that: in the ring network, two hosts are backups of each other, when a main host fails, the other backup host is autonomously switched to the main host, so that the stability and reliability of a time-frequency reference source are ensured; meanwhile, the number of the slave machines is flexibly configured according to the requirement.
When the closest cascade time-frequency synchronization link between the node device and the main host fails in the step (3), the node device is autonomously switched to the other link which is relatively far away to perform time synchronization and source tracing with the main host, so that the time-frequency synchronization service keeps continuous and stable operation.
Compared with the background technology, the invention has the following advantages:
1) the number of the slave machines in the ring network can be flexibly configured according to the user requirements, and more slave machines can be integrated into a time-frequency network architecture through the cascade networking, so that the system has strong expansibility, the time-frequency output capability is improved, and the time-frequency requirements of large span, multiple nodes and networking continuously provided by various system platforms are met.
2) Each node device is provided with a dual-channel optical fiber channel, an optimal time service link can be autonomously selected to trace to a main host, the number of crossing nodes and the length of the transmission link are reduced, the probability that the links are possibly problematic due to uncertain factors such as changes of the surrounding environment is reduced, and the stability, reliability and precision of time service are improved.
3) The redundancy design of the networking link redundancy design, the main host redundancy design and the like enables the whole time-frequency network to have rapid and stable transition when the faults of the link, the host and the like occur, and the system time service is continuous, stable and reliable without being influenced.
Drawings
Fig. 1 is a configuration diagram of an optical interface of an optical fiber cascade module of node equipment in the technical link of "basic configuration and establishment of ring networking" of the present invention.
Fig. 2 is a flow chart of the time-frequency network fast networking in the technical link of 'ring networking basic configuration and establishment'.
FIG. 3 is a schematic diagram of a time-frequency network networking path in the technical link of "autonomous selection of optimal path of time service link" of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A high-stability high-reliability time-frequency network implementation method based on an optical fiber ring network architecture realizes a high-stability high-reliability ring network type optical fiber time-frequency network through three technical approaches of ring network basic configuration and rapid establishment, time service link optimal path autonomous selection, redundancy backup and autonomous switching design, and realizes high-reliability, large-span, multi-node and networking time-frequency signal transmission, synchronization, distribution and time service.
The design key points of the invention are divided into three parts:
1) ring networking basic configuration and establishment
When designing a time-frequency network of a fiber ring network architecture, ring networking basic configuration is firstly carried out. Each node device in the time-frequency network comprises a master machine and a slave machine which realize networking cascade by a PTP optical fiber communication network port, after each node device is powered on, basic information configuration of the ring network is completed through node networking information interaction and cascade optical port configuration, and then a complete time-frequency synchronous network architecture is established on the basis.
Node networking information interaction
After each node is respectively electrified, the node information on the uplink connected with the node and the node information on the downlink are mutually transmitted, so that each node can acquire all the node information on the whole network, and basic data is provided for the self-adaptive redundant networking, and the method comprises the following steps:
and V, optical interface network parameters of each device.
Each node ID number.
And the power-on and power-off states of all nodes.
V. the current host.
The system synchronization status.
And v.PTP time service related information.
Cascaded module optical port configuration
Each node device is configured with an optical fiber cascade module, two optical ports are arranged in the cascade module, the optical ports support PTP masters or slaves, and the optical ports can be configured adaptively according to networking conditions, as shown in fig. 1. The configuration of the optical interface of the cascade module is the basis for realizing the optimal path selection and the flexible networking design.
Time-frequency network rapid networking
The time-frequency network fast networking process is shown in fig. 2. After the node equipment is started, networking information is mutually transmitted, a main host/a standby host is confirmed, cascade optical interface configuration and optimal path selection are carried out, and after networking is finished, time transmission and synchronization of the whole network are carried out.
When the networking system has state changes such as topology change, node shutdown, master-slave host switching and the like, each node autonomously updates the network topology and switches to a new networking mode according to the network topology direction of the current master host.
2) Time service link optimal path autonomous selection
The time service and time synchronization of the whole network are established on the basis of the quick networking of the system, and are realized by carrying out time-frequency transmission on the node equipment by the host. The path with the least number of nodes between each node of the ring network link and the main host M1 is the optimal path, and the selection of the optimal path is realized by the optimal path algorithm. Fig. 3 is a schematic diagram of a time-frequency network networking path.
The basic elements in fig. 3 are illustrated as follows:
host: m1;
v, standby host: m2;
v. slave: S1-Sn;
v PTP master: master;
PTP from: and (6) Slave.
Under the condition that the equipment and the ring network link are normal, each node equipment can collect the state information of the whole ring network through the network. In a ring network link, as the number of nodes increases and transmission links extend, the probability of problems occurring in these links may increase due to uncertain factors such as changes in the surrounding environment. Through an optimal path algorithm, the shortest path is selected, the number of cascade nodes and the length of a transmission link are effectively reduced, and the stability, reliability and precision of time service of each node device in the ring network are ensured. The specific implementation method comprises the following steps:
each node device automatically selects, according to the collected ring network node state information, a link with the least number of nodes from the master host M1 as a synchronization link, for example, the S2 node in fig. 3, in the two links of S2, the node information collected by the optical port 1 is: S1-M1-M2-Sn- … … -S3; the node information collected by the optical port 2 is: s3- … … -Sn-M2-M1-S1. As can be seen from the two links, there are only 1 node between ports 1 and M1, and there are (n-2) +1 node between ports 2 and M1. If n is greater than 2, S2 configures optical port 1 as PTP slave and optical port 2 as PTP master. In the same way, other nodes (except M1) also configure the dual-optical-port master-slave status of the self-cascade module according to the optimal path principle, and realize the high-reliability time-frequency synchronization service of autonomous switching.
3) Redundant backup and autonomous switching design
In the invention, the design of redundancy backup and autonomous switching mainly comprises the design of redundancy backup and switching of a main host and a standby host, the design of redundancy backup and switching of a networking link and the design of redundancy of a clock/data dual network, and the design of redundancy backup and autonomous switching is carried out, aiming at solving the problem that when the looped network has abnormal conditions such as link failure, host failure and the like, the whole network keeps continuous, stable and reliable time transfer and is not influenced.
Redundancy backup and switching design for main and standby host computers
The ring network architecture is provided with a main host and a standby host, the main host and the standby host implement a dual-redundancy hot backup design, and can implement autonomous switching or manual switching according to the self state to provide stable time reference for the whole network.
Networking link redundancy backup and switching design
The optical ports of the node devices interact information of the nodes at regular time, master and slave roles are automatically switched according to the information, redundant backup of links is realized, a looped network is formed by the system, a certain level of node device or link is abnormal, adjacent node devices are automatically switched to another link, namely, after the main link is abnormal, link switching is quickly realized, the communication and time service functions of the looped network cannot be influenced, the normal operation of the node devices is ensured, the system is stable and reliable, the diversity and integrity of networking forms are ensured, and the time service capability of the whole system is improved.
Clock/data dual-network redundancy design
Through the clock/data dual-network redundancy design, the clock and the data are transmitted on the same optical fiber in a centralized mode, the clock transmission and synchronization of the whole network and the equipment monitoring function of the whole network can be completed, and the advantage of big data can be formed by autonomous redundant ring network communication along with the gradual increase of ring network cascade equipment.
The method comprises the following concrete steps:
(1) two hosts and a plurality of slave machines are cascaded and networked in a mode of optical fiber cascade loop networking, one host is selected as a master host, and after networking, each node device respectively carries out networking information interaction to complete basic information configuration of a ring network; wherein, the host and the slave in the ring network are called node equipment;
(2) after each node device in the ring network is powered on, the node information, the node device information on an uplink and the node device information on a downlink which are connected with the node device are mutually transmitted, and each node device respectively acquires the information of all the node devices on the whole network;
(3) each node device in the ring network selects the nearest cascade time frequency synchronous link with the main host computer to carry out time synchronization and tracing through an optimal path selection method, so as to form a complete annular time frequency synchronous network;
(4) the master host generates a time-frequency reference source, and each slave receives the time-frequency reference source output by the master host through the ring network, synchronously generates and shunts and outputs a time-frequency signal.
Those skilled in the art will appreciate that those matters not described in detail in this specification are well known in the art. In addition to the above embodiments, the present invention may have other embodiments, and all technical solutions adopting equivalents or equivalent forms are within the scope of the claims of the present invention.
Claims (4)
1. A high-stability high-reliability time frequency network implementation method based on an optical fiber ring network architecture is characterized by comprising the following steps:
(1) two hosts and a plurality of slave machines are cascaded and networked in a mode of optical fiber cascade loop networking, one host is selected as a master host, and after networking, each node device respectively carries out networking information interaction to complete basic information configuration of a ring network; wherein, the host and the slave in the ring network are called node equipment;
(2) after each node device in the ring network is powered on, the node information, the node device information on an uplink and the node device information on a downlink which are connected with the node device are mutually transmitted, and each node device respectively acquires the information of all the node devices on the whole network;
(3) each node device in the ring network selects the nearest cascade time frequency synchronous link with the main host computer to carry out time synchronization and tracing through an optimal path selection method, so as to form a complete annular time frequency synchronous network;
(4) the master host generates a time-frequency reference source, and each slave receives the time-frequency reference source output by the master host through the ring network, synchronously generates and shunts and outputs a time-frequency signal.
2. The method for implementing a high-stability high-reliability time-frequency network based on an optical fiber ring network architecture according to claim 1, wherein each node device in the ring network is configured with an optical fiber cascade module, the cascade module is internally provided with two optical ports, the optical ports support PTP masters or slaves, and the cascade module is configured with the optical ports adaptively according to networking conditions and is communicated with the connected node devices through an uplink or a downlink.
3. The method for implementing a high-stability high-reliability time-frequency network based on an optical fiber ring network architecture according to claim 1, wherein: in the ring network, two hosts are backups of each other, when a main host fails, the other backup host is automatically switched to the main host; meanwhile, the number of the slave machines is flexibly configured according to the requirement.
4. The method for implementing a high-stability high-reliability time-frequency network based on an optical fiber ring network architecture according to claim 1, wherein: and (3) when the nearest cascade time-frequency synchronous link between the node equipment and the main host fails, autonomously switching to the other link relatively far away to perform time synchronization and source tracing with the main host.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112379585A (en) * | 2020-11-12 | 2021-02-19 | 中国船舶重工集团公司第七0七研究所 | Time-frequency system and method with node hopping capability based on optical fiber ring architecture |
| CN113949476A (en) * | 2021-10-08 | 2022-01-18 | 中国电子科技集团公司第三十研究所 | Optical fiber time synchronization network networking method and device based on safety time quality |
| CN115021802A (en) * | 2022-06-01 | 2022-09-06 | 清华大学 | Self-healing optical fiber time-frequency synchronous network, synchronous method, networking and medium |
| CN115118335A (en) * | 2022-08-29 | 2022-09-27 | 中国船舶重工集团公司第七0七研究所 | Main-standby switching method of time-frequency reference equipment and time-frequency reference equipment applying same |
| CN117119461A (en) * | 2023-10-25 | 2023-11-24 | 成都金诺信高科技有限公司 | Multi-dimensional matrix time-frequency synchronous safety protection method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2045971A1 (en) * | 2007-10-04 | 2009-04-08 | Harman Becker Automotive Systems GmbH | Data network with time synchronization mechanism |
| EP2541815A1 (en) * | 2011-06-28 | 2013-01-02 | Alcatel Lucent | Clock synchronization network |
| CN103107876A (en) * | 2011-11-15 | 2013-05-15 | 中兴通讯股份有限公司 | Implementation method, system and device for multi-clock synchronization technology hybrid networking |
| CN203596827U (en) * | 2013-08-16 | 2014-05-14 | 北京卓越信通电子股份有限公司 | Time synchronization system, switch, and embedded interface board |
| CN104092528A (en) * | 2014-07-14 | 2014-10-08 | 杭州华三通信技术有限公司 | Clock synchronization method and device |
| US20150222413A1 (en) * | 2012-06-20 | 2015-08-06 | Antti Olavi Pietilainen | Synchronization in Computer Network |
| CN105591697A (en) * | 2016-01-20 | 2016-05-18 | 中国科学院上海光学精密机械研究所 | High-precision fiber time-frequency ring networking system and networking method |
| US20180287725A1 (en) * | 2017-03-30 | 2018-10-04 | Adva Optical Networking Se | System and method of clock management in a packet data network |
| CN109510658A (en) * | 2018-12-29 | 2019-03-22 | 湖北航天技术研究院总体设计所 | Applied to group network access method, system and the platform under more floating platform scenes |
| CN109982428A (en) * | 2019-04-02 | 2019-07-05 | 海能达通信股份有限公司 | Construct method, terminal, the network equipment and the synchronous network system of synchronizing network |
-
2019
- 2019-12-13 CN CN201911289321.7A patent/CN110958504A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2045971A1 (en) * | 2007-10-04 | 2009-04-08 | Harman Becker Automotive Systems GmbH | Data network with time synchronization mechanism |
| EP2541815A1 (en) * | 2011-06-28 | 2013-01-02 | Alcatel Lucent | Clock synchronization network |
| CN103107876A (en) * | 2011-11-15 | 2013-05-15 | 中兴通讯股份有限公司 | Implementation method, system and device for multi-clock synchronization technology hybrid networking |
| US20150222413A1 (en) * | 2012-06-20 | 2015-08-06 | Antti Olavi Pietilainen | Synchronization in Computer Network |
| CN203596827U (en) * | 2013-08-16 | 2014-05-14 | 北京卓越信通电子股份有限公司 | Time synchronization system, switch, and embedded interface board |
| CN104092528A (en) * | 2014-07-14 | 2014-10-08 | 杭州华三通信技术有限公司 | Clock synchronization method and device |
| CN105591697A (en) * | 2016-01-20 | 2016-05-18 | 中国科学院上海光学精密机械研究所 | High-precision fiber time-frequency ring networking system and networking method |
| US20180287725A1 (en) * | 2017-03-30 | 2018-10-04 | Adva Optical Networking Se | System and method of clock management in a packet data network |
| CN109510658A (en) * | 2018-12-29 | 2019-03-22 | 湖北航天技术研究院总体设计所 | Applied to group network access method, system and the platform under more floating platform scenes |
| CN109982428A (en) * | 2019-04-02 | 2019-07-05 | 海能达通信股份有限公司 | Construct method, terminal, the network equipment and the synchronous network system of synchronizing network |
Non-Patent Citations (1)
| Title |
|---|
| 赵晓宇: "基于光纤环形网的多点高精度时频传递方法", 《光学学报》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112379585A (en) * | 2020-11-12 | 2021-02-19 | 中国船舶重工集团公司第七0七研究所 | Time-frequency system and method with node hopping capability based on optical fiber ring architecture |
| CN113949476A (en) * | 2021-10-08 | 2022-01-18 | 中国电子科技集团公司第三十研究所 | Optical fiber time synchronization network networking method and device based on safety time quality |
| CN113949476B (en) * | 2021-10-08 | 2023-05-09 | 中国电子科技集团公司第三十研究所 | Optical fiber time synchronization network networking method and device based on safe time quality |
| CN115021802A (en) * | 2022-06-01 | 2022-09-06 | 清华大学 | Self-healing optical fiber time-frequency synchronous network, synchronous method, networking and medium |
| CN115118335A (en) * | 2022-08-29 | 2022-09-27 | 中国船舶重工集团公司第七0七研究所 | Main-standby switching method of time-frequency reference equipment and time-frequency reference equipment applying same |
| CN115118335B (en) * | 2022-08-29 | 2022-11-18 | 中国船舶重工集团公司第七0七研究所 | Main-standby switching method of time-frequency reference equipment and time-frequency reference equipment applying same |
| CN117119461A (en) * | 2023-10-25 | 2023-11-24 | 成都金诺信高科技有限公司 | Multi-dimensional matrix time-frequency synchronous safety protection method |
| CN117119461B (en) * | 2023-10-25 | 2024-02-20 | 成都金诺信高科技有限公司 | Multi-dimensional matrix time-frequency synchronous safety protection method |
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