In this paper, based on the previous network clock server input system, medical research institutions and other organizations in the network clock server security concerns were explained, aiming at the user's understanding of the network clock server deviation made a simple explanation, hoping to remove the user cognitive error.

The network clock server is a function of a certain fixed time base, such as Beidou satellite signal, GPS satellite signal, IRIG-B code and other different time acquisition sources to get a unified time.

When the network clock server is transmitting the time through the network, it mainly includes the functions of two kinds of network timing modes, namely, NTP and PTP, respectively, through the network timing protocol formed by self programming, and the process of docking with the client devices of the users in the existing network.

When the network clock server's output function is applied, whether it is NTP network signal or PTP network signal with higher precision time service, it relies on the private network, LAN or networking form to provide time service. PTP network clock server is a kind of high precision time service device which appears in the form of network. It can only be used in time service, and it can only provide time for the equipment under the same network. It has enough security to encrypt the security itself. NTP network clock server is relatively common. Currently, through the expansion of functions, as the NTP time service core module manufacturer in the market, the SYN series NTP network clock server in Xi'an has already been able to meet the function of interworking the network segments under the intersections. Moreover, in the design of the network clock server, single port modules are guaranteed, and each path is an independent module. The physical isolation of each segment of the whole device is guaranteed, which provides a powerful guarantee for users' physical isolation function under multiple network time service. At the same time, users can choose physical isolating switch under the request of their own external network, and first realize the isolation function of their own network.

When the network clock server performs its function, the external time it receives is only applied to its own function. After receiving the external time, it does not transmit any frequency information or wireless signal through any wireless form. At the same time, when the network clock server is erecting the satellite antenna, the satellite antenna placed in the outdoor open space is only applied to the satellite signal reception which is suitable for different frequency bands of the antenna, and does not have the function of transmitting the external band signal. For example, when receiving the signal of the GPS satellite L1 band, it can only receive the signal of 1575.42 GPS effective frequency position, and receive the B1 band of the Beidou satellite. The signal can only receive 1561.098 Beidou effective frequency position signal. A simple explanation is that the input signals of the network clock server only serve the application of the device's own functions. Even if there are external antennas, there is no external location information, so the input security and reliability can be guaranteed.

The above is an explanation for the security of the network clock server from the two aspects of output and input. At the same time, it reminds users to pay attention to the physical isolation of the output signals when choosing the network clock server. Some manufacturers are distributing multiple NTP network interfaces through a motherboard, which can not meet the physical isolation network security. Please call our company.

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