TW202402008A - Method and device for time synchronization of time synchronization domains - Google Patents

Abstract

A time synchronization method for a time synchronization device is provided. The time synchronization device connects a plurality of time synchronization domains through a plurality of ports, and the plurality of time synchronization domains complies with a plurality of PTP profiles respectively. The time synchronization method includes determining each port of the plurality of ports to be a time receiving port or a time transmitting port; obtaining information of a grandmaster clock (GM) in the plurality of time synchronization domains; converting the information of the GM to generate a plurality of clock information corresponding to each time transmitting port of the plurality of ports according to the PTP profile of the plurality of PTP profiles corresponding to the each time transmitting port of the plurality of ports; and transmitting a corresponding clock information among the plurality of clock information to a corresponding time synchronization domain by each time transmitting port for time synchronization.

Description

Time synchronization method and device for domain synchronization time

The present invention refers to a time synchronization method and device, and in particular, to a time synchronization method and device for time synchronization in multiple time synchronization network domains.

Precision Time Protocol (PTP) is the basic standard for time synchronization formulated by IEEE 1588 and is used to achieve high-precision clock synchronization. However, as the market evolves, applications in various networks have their own different requirements. Therefore, previous technologies have proposed many different PTP profiles (Profiles) according to different applications, such as Power Profile (Power Profile) for power networks. IEEE Std C37.238), Telecom Profile of telecommunications network (ITU-T G.8265.1) and Generalized Precision Time Synchronization Protocol (IEEE Std 802.1AS: Generalized Precision Time Protocol, gPTP) configuration files, etc. Configuration files allow applications in different fields to set different operating parameters, attributes, default values, and other settings to meet their needs. As a result, devices and networks using various configuration files cannot effectively communicate with each other. Generally speaking, in order to ensure time synchronization, devices or equipment in the same environment are required to use corresponding configuration files, making cross-domain time integration relatively difficult.

Currently, the protocol used to achieve precise time synchronization in Time Sensitive Networks is standardized by the generalized precision time synchronization protocol defined by IEEE 802.1AS. The Generalized Precision Time Protocol Profile (gPTP Profile) is also one of the profiles developed according to IEEE 1588. It simplifies PTP and optimizes it for time-sensitive applications. However, under this protocol, all devices and network nodes need to support gPTP profiles in order to perform time synchronization on time-sensitive networks. In this case, the device manufacturer needs to update the device or modify all devices that use other types of configuration files to use gPTP configuration files, which causes great trouble. Therefore, there is a need to improve conventional techniques.

Therefore, the main purpose of the present invention is to provide a method for integrating multiple devices or networks using different types of precise time protocol profiles for time synchronization without affecting the accuracy of time synchronization, so as to improve the conventional technology. shortcoming.

An embodiment of the present invention discloses a time synchronization method for a time synchronization device. The time synchronization device is connected to a plurality of time synchronization network domains through a plurality of connection ports. The plurality of time synchronization network domains use a plurality of precise time protocol configuration files. The time synchronization method includes determining each connection port of the plurality of connection ports as a time receiving port or a time transmission port; obtaining information of a master clock in the plurality of time synchronization domains; and based on the plurality of precise times. A precise time protocol configuration file corresponding to each time port of the plurality of ports in the protocol configuration file is used to perform information conversion on the information of the master clock to generate each time port corresponding to the plurality of ports. A plurality of clock information; and transmitting a corresponding clock information among the plurality of clock information to a corresponding time synchronization network domain from each time transfer port of the plurality of connection ports for time synchronization.

An embodiment of the present invention further discloses a time synchronization device, wherein the time synchronization device is connected to a plurality of time synchronization network domains through a plurality of connection ports, and the plurality of time synchronization network domains use a plurality of precise time protocol configuration files. The time synchronization device includes There is a processing unit for executing a program code; and a storage unit coupled to the processing unit for storing the program code to instruct the processing unit to execute a time synchronization method. The time synchronization method includes determining each connection port of the plurality of connection ports as a time receiving port or a time transmission port; obtaining information of a master clock in the plurality of time synchronization domains; and based on the plurality of precise times. A precise time protocol configuration file corresponding to each time port of the plurality of ports in the protocol configuration file is used to perform information conversion on the information of the master clock to generate each time port corresponding to the plurality of ports. A plurality of clock information; and transmitting a corresponding clock information among the plurality of clock information to a corresponding time synchronization network domain from each time transfer port of the plurality of connection ports for time synchronization.

Certain words are used in the description and subsequent patent claims to refer to specific components. It will be understood by those with ordinary knowledge in the art that hardware manufacturers may use different terms to refer to the same component. This specification and subsequent patent applications do not use differences in names as a way to distinguish components, but differences in functions as a criterion for distinction. The "include" mentioned throughout the specification and subsequent patent claims is an open-ended term, and therefore should be interpreted as "include but not limited to".

Please refer to Figure 1, which is a schematic diagram of a network system 1. The network system 1 includes time synchronization domains (domains) 12_1 to 12_3, where each time synchronization domain can be a network domain composed of a wired network, a wireless network, or a combination of the two, and can be composed of multiple devices and A network domain composed of multiple network switches and other equipment (including multiple clocks) can also be a network domain composed of only a single device (only one clock). Time synchronization domains 12_1 to 12_3 are time synchronization domains that operate according to the specifications of different types of Precision Time Protocol Profile (PTP Profile) A to C respectively. It should be noted that since the time synchronization domains 12_1 ~ 12_3 run the time synchronization mechanism according to different precise time agreement configuration files A ~ C, cross-domain time synchronization integration cannot be performed. In this case, each time synchronization network domain has an optimal clock (such as the optimal clocks 14_1~14_3 in Figure 1) running as the master clock (Grandmaster, GM) of each time-sensitive network domain, that is That is, devices belonging to the same network domain all synchronize their time according to the master clock of the network domain to which they belong. Among them, the best clock refers to the most ideal clock suitable for a specific time synchronization network domain evaluated based on factors such as time source, time accuracy, oscillator stability, etc. It can also be determined by humans as the most suitable clock for a specific time synchronization network domain. clock. In this case, when a manufacturer wants to replace or add a new device in a network domain, the new device must be compatible with the precise time protocol configuration file used by the corresponding network domain; when the device manufacturer develops the device, it must be based on various different Precision time agreement configuration files require equipment customization or adjustment before they can be used in different fields; when the domain to which they belong wants to integrate with other specific time synchronization domains, it may be necessary to upgrade all equipment and network devices to integrate with the generalized time synchronization domain. Precision Time Protocol profile compatibility.

In order to enable all devices in the network system 1 to achieve time synchronization based on the same master clock without affecting the time synchronization accuracy, the present invention provides a time synchronization device that can be connected to the time synchronization network domains 12_1 to 12_3 , used to integrate the time of different time synchronization domains. For details, please refer to Figure 2. Figure 2 is a schematic diagram of a time synchronization network system 2 according to an embodiment of the present invention. The time synchronization network system 2 includes time synchronization network domains 12_1 to 12_3 and a time synchronization device 10 . The time synchronization device 10 may be a network device such as a gateway, a switch, a router, and a bridge running in the network, but is not limited thereto. The time synchronization device 10 is connected to the time synchronization network domains 12_1 to 12_3 through the connection ports 16_1 to 16_3 respectively. In the embodiment of the present invention, the time synchronization network domains 12_1 ~ 12_3 can perform time synchronization through the time synchronization device 10 according to a time synchronization method, thereby achieving that all the equipment and devices in the time synchronization network domains 12_1 ~ 12_3 are based on the specified network domain. The time of the main clock 14_1 is synchronized. In addition, in the time synchronization network system 2, the number of time synchronization network domains 12_1 to 12_3 is 3, which is for illustration only. The time synchronization device 10 of the embodiment of the present invention can be applied to any number of time synchronization network domains. time synchronization, but not limited to this.

The time synchronization method in the embodiment of the present invention can be summarized as a process 3. As shown in Figure 3, the process 3 includes the following steps:

Step 300: Start.

Step 302: Determine each of the plurality of ports to be a temporal receiving port or a temporal transmitting port.

Step 304: Obtain information of a master clock in a plurality of time synchronization network domains.

Step 306: Convert the information of the master clock according to the precise time protocol configuration files corresponding to each time transmission port of the plurality of connection ports to generate information corresponding to the plurality of precise time protocol configuration files. Multiple clock information for each time-sent port.

Step 308: Send a corresponding clock information among the plurality of clock information to a corresponding time synchronization network domain from each time transmission port of the plurality of connection ports for time synchronization.

Step 310: End.

According to the process 3, the time synchronization device 10 first determines a plurality of connection ports as a time receiving port or a time transmitting port (step 302). Among them, the time receiving port represents a connection port used to receive information related to clock and time, or according to the specifications of the precise time protocol, that is, the port state (portState) is set to SlavePort; the time transmission port is used to transmit Ports related to clock and time information, or ports whose port status is set to MasterPort according to the specifications of the Precision Time Protocol. After determining that each connection port is a time receiving port or a time transmitting port, the time synchronization device 10 needs to further obtain information related to the master clock (step 304). Accordingly, the time synchronization device 10 needs to convert the information of the master clock according to the precise time agreement configuration file corresponding to each time transmission port among the plurality of precise time agreement configuration files to generate a clock corresponding to each time transmission port. information (step 306), and then sends the clock information from each time transmission port to the corresponding time synchronization network domain (step 308), thereby synchronizing the time. Accordingly, all time synchronization network domains connected to the time synchronization device 10 can be operated according to the time of the same master clock.

In other words, the time synchronization device 10 receives the clock-related information sent from the master clock through the time receiving port, converts the master clock information according to the precise time protocol configuration file corresponding to the time transmission port, and then sends the converted information from each time transmission port. clock information to the corresponding time synchronization domain. Accordingly, all equipment and devices in the time synchronization network system 2 can be operated according to the time of the same master clock.

Specifically, taking Figure 2 as an example, the time synchronization device 10 first determines each of the connection ports 16_1 to 16_3 as a time receiving port or a time transmitting port. In one embodiment, the time synchronization device 10 can first determine the precise time protocol configuration file A of the time synchronization network domain 12_1 to which the master clock 14_1 belongs, and then compare the corresponding ones used by all the connection ports 16_1 to 16_3 of the time synchronization device 10 one by one. Precise Time Agreement Profile. When the precise time protocol configuration file corresponding to one of the ports 16_1 to 16_3 is the same as the precise time protocol configuration file A, the port is determined to be a time receiving port (i.e., port 16_1), and the remaining ports (i.e., Ports 16_2 and 16_3) are time transfer ports. Since the time receiving port 16_1 receives clock-related information sent from the master clock 14_1 in the time synchronization domain 12_1, such as Announce message, Sync message, etc., the time synchronization device 10 can pass the time Receive port 16_1 obtains information about the master clock. Further, the time synchronization device 10 needs to perform information conversion on the precise time agreement configuration files B and C respectively, that is, the time synchronization domains 12_2 and 12_3 corresponding to the time transmission ports 16_2 and 16_3, to generate the time synchronization domains corresponding to the time transmission ports 16_2 and 16_3. Clock information of 12_2 and 12_3. Finally, the time synchronization device 10 sends the converted clock information to the corresponding time synchronization network domains 12_2 and 12_3 through the time transmission ports 16_2 and 16_3, thereby synchronizing the time.

As can be seen from the above, the time synchronization device 10 receives information from the master clock 14_1 of the time synchronization network domain 12_1 through the time receiving port 16_1, which includes clock related information and time information. The information of the master clock 14_1 received by the time synchronization network domain 12_1 is the information transmitted according to the precise time protocol configuration file A. Therefore, the format and information conversion need to be performed by the time synchronization device 10 in order to generate the information suitable for using different precise time protocol configuration files. domain. Therefore, the time synchronization device 10 converts the information of the master clock 14_1 received by the time receiving port 16_1 according to the precise time protocol configuration files B and C corresponding to the time synchronization network domains 12_2 and 12_3 respectively, and finally formats the converted information. Time information is sent to time synchronization domains 12_2 and 12_3 through time transmission ports 16_2 and 16_3 respectively. This allows time synchronization across various domains using different precise time protocol profiles.

In Figure 2, using a single time synchronization device 10 and according to process 3, the time synchronization network system 2 can achieve that all time synchronization network domains connected to the time synchronization device 10 run according to the time of the same master clock, thus synchronizing the time. Those with ordinary knowledge in the art can make appropriate changes according to the requirements of the system, and are not limited to this. For example, please refer to Figure 4, which is a schematic diagram of a time synchronization network system 4 according to an embodiment of the present invention. In this embodiment, the time synchronization network system 4 performs time synchronization of the time synchronization network domains 12_1 to 12_3 through two time synchronization devices 40_1 and 40_2. Among them, the time synchronization device 40_1 is connected to the time synchronization network domains 12_1 and 12_2 through the connection ports 46_1 and 46_2 respectively, and the time synchronization device 40_2 is connected to the time synchronization network domains 12_2 and 12_3 through the connection ports 46_3 and 46_4 respectively. Similar to the operation mode of the time synchronization device 10, after determining the time synchronization network domain to which the master clock 14_1 belongs, the time synchronization device 40_1 can determine the corresponding precise time protocol profile A, and accordingly determine the connection port 46_1 as a time receiving port, and the connection port 46_2 is a time transfer port. Therefore, through the time synchronization device 40_1, the information related to the master clock 14_1 of the precise time protocol profile A can be received through the time receiving port 46_1. After the information and format are converted, the information corresponding to the precise time protocol profile A can be sent through the time transmission port 46_2. B's time information is sent to the time synchronization domain 12_2. In this case, the time synchronization network domain 12_2 can be made to perform time synchronization according to the master clock 14_1 located in the time synchronization network domain 12_1. Correspondingly, since the master clock 14_1 is transmitted to the time synchronization device 40_2 through the time synchronization network domain 12_2, the time synchronization device 40_2 can determine the connection port 46_3 as a time receiving port and the connection port 46_4 as a time transmission port. Therefore, through the time synchronization device 40_2, the information related to the master clock 14_1 of the precise time protocol profile B can be received through the time receiving port 46_3. After the information and format are converted, the information corresponding to the precise time protocol profile B can be sent through the time transmission port 46_4. The time information of C is sent to the time synchronization domain 12_3. Accordingly, the time synchronization network system 4 can utilize the two time synchronization devices 40_1 and 40_2 to achieve time synchronization of the time synchronization network domains 12_1˜12_3.

Please refer to Figure 5. Figure 5 is a schematic diagram of a time synchronization network system 5 according to an embodiment of the present invention. In this embodiment, the time synchronization network system 5 performs time synchronization of the time synchronization network domains 12_1 to 12_3 through two time synchronization devices 50_1 and 50_2. Among them, the time synchronization device 50_1 is connected to the time synchronization network domains 12_1 and 12_2 through the connection ports 56_1 and 56_2 respectively, and the time synchronization device 50_2 is connected to the time synchronization network domains 12_1 and 12_3 through the connection ports 56_3 and 56_4 respectively. After determining the time synchronization network domain to which the master clock 14_1 belongs, the time synchronization device 50_1 can determine the corresponding precise time protocol profile A, and accordingly determines the connection port 56_1 as a time receiving port and the connection port 56_2 as a time transmitting port. Through the time synchronization device 50_1, the information related to the master clock 14_1 of the precise time agreement profile A can be received through the time receiving port 56_1. After the information and format are converted, the information corresponding to the precise time agreement profile B is sent out through the time transmission port 56_2. Time information to time synchronization domain 12_2. In this way, the time synchronization network domain 12_2 can be time synchronized according to the master clock 14_1 located in the time synchronization network domain 12_1. Similarly, the time synchronization device 50_2 can determine the connection port 56_3 to be a time receiving port and the connection port 56_4 to be a time transmitting port. Through the time synchronization device 50_2, the information related to the master clock 14_1 of the precise time agreement profile A can be received through the time receiving port 56_3. After the information and format are converted, the information corresponding to the precise time agreement profile C is sent out through the time transmission port 56_4. The converted time information is sent to the time synchronization domain 12_3. Accordingly, the time synchronization network system 5 can utilize the two time synchronization devices 50_1 and 50_2 to achieve time synchronization of the time synchronization network domains 52_1 to 52_3.

In the aforementioned embodiments, the time synchronization device determines whether each connection port is a time receiving port or a time transmitting port by comparing the precise time protocol configuration file corresponding to the master clock with the precise time protocol configuration file corresponding to each connection port. In another embodiment, the time synchronization device may be the master clock. In other words, the master clock does not belong to any time synchronization network domain connected to the time synchronization device. In this case, time synchronization can still be performed according to process 3. Please refer to Figure 6, which is a schematic diagram of a time synchronization network system 6 according to an embodiment of the present invention. The time synchronization network system 6 includes time synchronization network domains 12_1 to 12_3 and a time synchronization device 60 . In this embodiment, the time synchronization network system 6 uses one of the clocks 64 of the time synchronization device 60 as the main clock, and synchronizes the time of the time synchronization network domains 12_1 to 12_3 accordingly. In this embodiment, the master clock 64 does not belong to any time synchronization network domain 12_1˜12_3 connected to the time synchronization device 60. Therefore, the time synchronization device 60 can set all connection ports 66_1˜66_3 as time transmission ports (step 302). Since the time synchronization device 60 does not have a time receiving port, the information of the master clock 64 is directly obtained from the time synchronization device 60 itself (step 304). Next, the time synchronization device 60 needs to perform information conversion on the precise time protocol configuration files A, B, and C used by the time synchronization domains 12_1 ~ 12_3 corresponding to the time transmission ports 66_1 ~ 66_3, respectively, to generate the time synchronization domain 12_1 corresponding to the precise time protocol configuration files A, B, and C. ~12_3 clock information (step 306). Finally, the converted clock information is sent to the corresponding time synchronization network domains 12_1 to 12_3 through the time transmission ports 66_1 to 66_3 (step 308), so as to synchronize the time. Accordingly, all time synchronization network domains 12_1 to 12_3 connected to the time synchronization device 60 can operate according to the time of the master clock 64 provided by the time synchronization device 60 .

In addition, it should be noted that in the above embodiments, the time synchronization network systems 2, 4, 5, and 6 include 3 time synchronization network domains and 1 or 2 time synchronization devices, which are for illustration only. The embodiments of the present invention can be applied to time synchronization of any number or combination of time synchronization network domains and time synchronization devices, but are not limited thereto. Those with ordinary knowledge in the art can adopt appropriate network topology according to actual needs.

Further, please refer to FIG. 7 , which is a schematic diagram of a network device 7 according to an embodiment of the present invention. The network device 7 may be a network device such as a gateway, a switch, a router, and a bridge running in a time-sensitive network, but is not limited thereto. Any network device 7 with multiple connection ports can be used to implement the time synchronization devices 10, 40_1, 40_2, 50_1, 50_2 and 60 in the embodiment of the present invention. As shown in FIG. 7 , the network device 7 may include a processing unit 70 and a storage unit 72 . The processing unit 70 may be a general processor, a microprocessor, an Application Specific Integrated Circuit (ASIC), etc. or a combination thereof. The storage unit 72 is coupled to the processing unit 70 and can be any data storage device used to store a program code 720 and read and execute the program code 720 through the processing unit 70 . For example, the storage unit 72 may be a read-only memory (ROM), a flash memory (flash memory), a random access memory (RAM), a hard disk, and an optical data storage device. Non-volatile storage units, etc., but not limited to these.

The network device 7 is used to represent the necessary components needed to implement the embodiment of the present invention. Those with ordinary skill in the art can make different modifications and adjustments accordingly, without being limited thereto. For example, when the network device 7 is used to implement the time synchronization device, the process 3 of the time synchronization method can be compiled into program code 720 and stored in the storage unit 72 , and the processing unit 70 executes the time synchronization method. In addition, the storage unit 72 is also used to store master clock related information, precise time agreement configuration files, and data required for running the time synchronization method, but is not limited thereto.

In summary, the present invention provides a time synchronization method and device that can perform cross-domain time synchronization in multiple time synchronization network domains using different precise time protocol configuration files, thereby improving the shortcomings of the conventional technology that lack integration flexibility. . The above are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the patentable scope of the present invention shall fall within the scope of the present invention.

1: Network system 12_1～12_3: Time synchronization domain 14_1～14_3: Best local clock A, B, C: Precise Time Agreement Profile 2, 4, 5, 6: Time synchronization network system 10: Time synchronization device 16_1～16_3: Port 3: Process 300～314: steps 40_1, 40_2: Time synchronization device 40_1～40_4: Port 50_1, 50_2: Time synchronization device 50_1～50_4: connection port 60: Time synchronization device 60_1～60_3: connection port 64:Master clock 7:Network device 70: Processing unit 72:Storage unit 720:Program code

Figure 1 is a schematic diagram of a network system. Figure 2 is a schematic diagram of a time synchronization network system according to an embodiment of the present invention. Figure 3 is a schematic flow chart of a time synchronization method according to an embodiment of the present invention. Figure 4 is a schematic diagram of a time synchronization network system including two time synchronization devices according to an embodiment of the present invention. Figure 5 is a schematic diagram of a time synchronization network system including two time synchronization devices according to an embodiment of the present invention. Figure 6 is a schematic diagram of a time synchronization network system using the time of a time synchronization device in an embodiment of the present invention. Figure 7 is a schematic diagram of a network device according to an embodiment of the present invention.

2: Time synchronization network system

10: Time synchronization device

12_1~12_3: Time synchronization domain

14_1~14_3: Best local clock

16_1~16_3: Port

A, B, C: Precise Time Agreement Profile

Claims (16)

A time synchronization method is used for a time synchronization device. The time synchronization device is connected to a plurality of time synchronization network domains through a plurality of connection ports. The plurality of time synchronization network domains use a plurality of Precision Time Protocol Profiles (Precision Time Protocol Profile, PTP Profile), the time synchronization method includes: Determine each of the plurality of ports to be a temporal receiving port or a temporal transmitting port; Obtain information about a master clock (Grandmaster, GM) in the plurality of time synchronization domains; According to the precise time protocol configuration files corresponding to each time transmission port of the plurality of connection ports, the information of the master clock is converted into information to generate the information corresponding to the plurality of connection ports. A plurality of clock information for each time port; and Each time transmission port of the plurality of connection ports transmits a corresponding clock information among the plurality of clock information to a corresponding time synchronization network domain for time synchronization. The time synchronization method as described in claim 1, wherein the step of determining each of the plurality of ports as a time receiving port or a time transmitting port includes: Determine the first precise time agreement profile of one of the time synchronization domains to which the master clock belongs; Comparing the plurality of precision time agreement configuration files with the first precision time agreement configuration file to generate a plurality of comparison results; and According to the plurality of comparison results, one of the plurality of connection ports is determined to be a time receiving port, and the other connection port is determined to be a time transmitting port. The time synchronization method as described in claim 2, wherein the step of determining one of the plurality of ports as a time receiving port and determining other ports as a time transmitting port based on the plurality of comparison results is based on the plurality of comparison results. When one of the comparison results shows that a precise time protocol profile corresponding to a port matches the first precise time protocol profile, the port is determined to be the time receiving port, and the other ports are determined to be time Transfer port. The time synchronization method as described in claim 2, wherein the step of obtaining the information of the master clock in the plurality of time synchronization network domains includes receiving the information of the master clock from the time receiving port. The time synchronization method as described in claim 1, wherein the step of determining each connection port of the plurality of connection ports to be a time receiving port or a time transmitting port includes when a clock of the time synchronization device is the master clock , determines that each of the plurality of ports is a time transfer port. The time synchronization method as described in claim 5, wherein the step of obtaining the information of the master clock is to obtain the information of the master clock by the time synchronization device. The time synchronization method as described in claim 1, wherein the time synchronization device is a network gateway, a network switch, a router or a bridge. The time synchronization method as described in claim 1, wherein the plurality of precise time agreement configuration files are different. A time synchronization device, wherein the time synchronization device is connected to a plurality of time synchronization network domains through a plurality of connection ports, and the plurality of time synchronization network domains use a plurality of Precision Time Protocol Profiles (PTP Profiles). The time Sync devices include: a processing unit for executing a program code; and A storage unit, coupled to the processing unit, is used to store the program code to instruct the processing unit to execute a time synchronization method. The time synchronization method includes: Determine each of the plurality of ports to be a temporal receiving port or a temporal transmitting port; Obtain information about a master clock (Grandmaster, GM) in the plurality of time synchronization domains; According to the precise time protocol configuration files corresponding to each time transmission port of the plurality of connection ports, the information of the master clock is converted into information to generate the information corresponding to the plurality of connection ports. A plurality of clock information for each time port; and Each time transmission port of the plurality of connection ports transmits a corresponding clock information among the plurality of clock information to a corresponding time synchronization network domain for time synchronization. The time synchronization device as claimed in claim 9, wherein the step of determining each of the plurality of ports as a time receiving port or a time transmitting port includes: Determine the first precise time agreement profile of one of the time synchronization domains to which the master clock belongs; Comparing the plurality of precision time agreement configuration files with the first precision time agreement configuration file to generate a plurality of comparison results; and According to the plurality of comparison results, one of the plurality of connection ports is determined to be a time receiving port, and the other connection port is determined to be a time transmitting port. The time synchronization device as claimed in claim 10, wherein the step of determining one of the plurality of connection ports as a time receiving port and determining other connection ports as a time transmission port based on the plurality of comparison results is based on the plurality of comparison results. When one of the comparison results shows that a precise time protocol profile corresponding to a port matches the first precise time protocol profile, the port is determined to be the time receiving port, and the other ports are determined to be time Transfer port. The time synchronization device of claim 10, wherein the step of obtaining the information of the master clock in the plurality of time synchronization network domains includes receiving the information of the master clock from the time receiving port. The time synchronization device as claimed in claim 9, wherein the step of determining each connection port of the plurality of connection ports as a time receiving port or a time transmission port includes when a clock of the time synchronization device is the master clock. , determines that each of the plurality of ports is a time transfer port. The time synchronization device as described in claim 13, wherein the step of obtaining the information of the master clock is to obtain the information of the master clock by the time synchronization device. The time synchronization device described in claim 9 is a network gateway, a network switch, a router or a bridge. The time synchronization device of claim 9, wherein the plurality of precise time agreement configuration files are different.

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