Time-Frequency Encyclopedia

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2020

Zhongxin Chuang has provided NTP clock synchronization equipment to the China Academy of Railway Sciences.

Recently ， The China Academy of Railway Sciences has released a clock synchronization system. of the Demand , Beijing Zhongxin Chuang Company is actively cooperating. For users A detailed plan has been prepared, and products independently developed and manufactured by Zhongxin Chuang have been recommended. DNTS- Type 9 As the product submitted for this tender, Zhongxin Chuang stood out by defeating competitors’ offerings thanks to its high‑quality products and comprehensive after‑sales service, ultimately… Awarded the Time Server by the China Academy of Railway Sciences Project 。

The China Academy of Railway Sciences is a multidisciplinary, multi‑specialized comprehensive research institution under China Railway. It has evolved into a large-scale science and technology enterprise integrating technological innovation, technical services,成果 transformation, consulting and supervision, testing and certification, and talent development.

China Academy of Railway Sciences To China–Singapore Innovation Independently developed DNTS-9 Time Server Conduct an in-depth evaluation and arrive at the final results. All are superior to the parameter requirements. ， And Regarding our company’s product quality and after-sales service Also quite satisfied. ， Procured successfully and put into use. ！

The network time server developed by Beijing Zhongxinchuang Technology Co., Ltd. The DNTS-9 is an intelligent, high-precision NTP network time server. It obtains standard time signals from navigation and positioning satellite systems such as GPS, BeiDou, GLONASS, and Galileo, and provides standard time services over the network via NTP/SNTP or other network protocols. Devices in the network that require time synchronization—such as personal computers, servers, and controllers—can thereby synchronize with international standard time.

Use simultaneously The GNSS satellite receiver allows priority settings and supports single‑receiver/dual‑receiver and single‑antenna/dual‑antenna configurations; each receiver can be configured to operate in either standalone or combined timing modes. When both receivers and all other available time sources lose signal, the DNTS‑9 relies on its built-in temperature‑compensated crystal oscillator or rubidium atomic clock for holdover, continuously providing time services to external users.

In addition to serving as a primary‑level network time‑synchronization device, the DNTS‑9 can also function as a secondary‑level time server, enabling more effective time synchronization in large‑scale network environments. It provides precise standard time signals for systems such as distributed networks, computer security systems, file management systems, e‑commerce platforms, online B2B systems, and cloud database storage and maintenance. The DNTS‑9 has been successfully deployed across government, finance, mobile telecommunications, public security, petroleum, power, transportation, industrial, and defense sectors. Installation and operation of the DNTS‑9 network time server are exceptionally straightforward: simply connect the satellite receiving antenna and link the Ethernet port to a network switch to achieve time synchronization for all devices on the network.

Network protocol	NTP v1, v2, v3, and v4 (RFC 1119 & 1305), SNTP (RFC 2030), Authentication (RFC 1321), Telnet (RFC 854), UDP NTP Unicast, Broadcast, Multicast, Autokey, TIME (RFC 868), FTP (RFC 959), DAYTIME (RFC 867), DHCP (RFC 2131)
	HTTP/SSL/HTTPS (RFC 2616), SSH/SCP (Internet Draft), SNMP v1, v2c, and v3, MIB II (RFC 1213), RSA asymmetric encryption, MD5 authentication, SHA authentication, AES encryption, DES encryption, RC4 encryption.
	IPv4, IPv6, IPv4/IPv6 Hybrid
Timekeeping mode	Support NTP Peer Client/Server Broadcast Multicast
Server performance	GNSS reference mode, Tier‑1 network time server, with an internal synchronization accuracy of 20 ns.
	User terminal synchronization timing accuracy: 0.1–2 ms (typical value for a local area network)
	User capacity: Supports tens of thousands of clients.
	NTP request rate: 25,000 requests per second (per network port)
	Can be used as a client to synchronize with others. NTP network time server
	Support 100,000 log entries; storage capacity can be expanded as needed.
Receiver	72-channel timing‑grade GNSS receiver, multi‑constellation GPS/BeiDou/GLONASS, supports RAIM, CDMA optional.
	UTC synchronization accuracy: 20 ns (RMS)
	Tracking and locking sensitivity can reach -166dBm
Timekeeping function	Temperature-compensated crystal oscillator (optional depending on model): Timing accuracy: standard configuration优于 8.6 µs/day (configurable and upgradeable to meet different requirements)
Timekeeping function	Rubidium atomic clock (optional depending on model): Timing accuracy: standard configuration better than 500 ns/day (configurable upgrades available to meet varying requirements)
Front panel	VFD high-brightness LCD display
	Display GPS/BD satellite reception status, time, number of GPS/BD satellites, IP addresses of each network port, system operating status, etc.
	6 tri-color indicator lights: PWR, ANT, SAT, LOCK, NTP, ALARM
	Signals indicating power, antenna, satellite, lock, timing, and alarms.
Rear panel	GNSS antenna input: BNC, with 1–2 channels optional.
	NTP network port: 1–10 ports, with optional 10/100/1000 Mbps or 10 Gigabit Ethernet interfaces.
	Console-RS232: 1 port
	USB Interface: 1 to 8 channels optional, supports USB 2.0/3.0, with backup, restore, and upgrade functions.
	TOD: DB-91 bus, RS232/RS485 levels, capable of outputting time, position, number of satellites, and other information.
	ALARM dry-contact alarm: 1–6 pairs optional, with alarms for satellite, power supply, antenna, port capacity, and more.
	10M output: BNC, 1 channel, selectable sine wave or square wave, impedance: 50 ohms; frequency accuracy: <1E-12
	1 PPS output: BNC, TTL level, accuracy ≤ 10 ns (RMS)
	Size: 1U/2U chassis
Physical Environment Parameters	Power Supply: AC 220 V ±20%, 47 Hz to 63 Hz; supports optional hot-swappable power supplies.
	Operating temperature: -10℃ to +55℃ (equipment) -40℃ to +75℃ (antenna)
	Storage temperature: -45℃ to +85℃
	Humidity: 95% non-condensing

After a long… 18 With years of industry experience, our company has established a strong corporate reputation and brand image, serving… Research institute Our clients also include:

China Electric Power Research Institute, Institute of Physics of the Chinese Academy of Engineering, China Academy of Launch Vehicle Technology, China Institute of Atomic Energy, Nanjing Institute of Astronomical Optical Technology of the National Astronomical Observatories, Instrument Research Institute of the Nanjing Astronomical Observatory of the Chinese Academy of Sciences, Xichang Satellite Launch Center, China Electronics Technology Group Corporation No. … 54th Research Institute, the 10th Research Institute of China Electronics Technology Group Corporation, the 15th Research Institute of China Electronics Technology Group Corporation, the 36th Research Institute of CETC, Taiyuan Satellite Launch Center, Beijing‑1 Satellite Ground Station, Shanghai Satellite Engineering Research Institute, China Putian, Shanghai Lizheng Satellite Application Technology Co., Ltd., Shanghai Small Satellite Engineering Center, China Merchants Chongqing Transportation Science Research Institute, and others. 。

The choice of numerous departments and enterprises reflects recognition of Zhongxin Chuang’s products and services. By working in close collaboration with partners across all sectors, we are jointly advancing toward win‑win outcomes for businesses and society alike.

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