Time-Frequency Encyclopedia

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2023

Zhongxin Chuangwei provides a precision clock to Beijing Xuelong.

Zhongxin Chuangwei provides a precision clock to Beijing Xuedilong.

Recently, Beijing Xuedilong issued a request for a time server. Beijing Zhongxin Chuang promptly collaborated to develop a detailed proposal and recommended its independently developed and manufactured DNTS-94-OGB model as the bid‑winning product. Following a fiercely competitive bidding process, Zhongxin Chuang stood out thanks to its high‑quality products and comprehensive after‑sales service, ultimately securing the Beijing Xuedilong time‑synchronization project.

Beijing SDL Technology Co., Ltd., a pioneer in China’s environmental monitoring and analytical instrumentation market, is a publicly listed company specializing in environmental monitoring, environmental big data, integrated environmental services, pollution control and energy conservation, and industrial process analysis. Founded in 2001 and listed in 2012 (stock code: 002658), the company has a registered capital of RMB 600 million and total net assets of RMB 2 billion. It operates more than 130 subsidiaries and offices and employs over 2,000 people. The company maintains a postdoctoral research workstation, is recognized as one of the Top 100 Enterprises by the Ministry of Ecology and Environment, and has been designated a Beijing Patent Demonstration Unit. It has also received the China Analytical Instrument Development Contribution Award. With 199 patented technologies and 215 software copyrights, the company undertakes major national projects for the development of scientific instruments and equipment, integrating R&D, design, manufacturing, sales, engineering operations, and comprehensive environmental services as a nationally recognized high-tech enterprise.

Beijing Xuedilong conducted an in-depth evaluation of the DNTS-94-OGB series time server, independently developed by Zhongxin Chuang. The results exceeded all specified performance parameters, and they expressed strong satisfaction with both our product quality and after-sales service, leading to a successful procurement and deployment.

The DNTS-9 network time server, developed by Beijing Zhongxinchuang Technology Co., Ltd., is an intelligent, high-precision NTP network time server. The DNTS-9 obtains standard time information 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.

Network protocol	NTP v1, v2, v3, and v4 (RFC 1119 and RFC 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	Supports 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 on a local area network)
	User capacity: Supports tens of thousands of clients.
	NTP request rate: 25,000 requests per second (per network port)
	It can be used as a client to synchronize with other NTP network time servers.
	Supports logging up to 100,000 entries and allows storage capacity to be expanded as needed.
Receiver	72-channel timing‑grade GNSS receiver, multi‑constellation GPS/BeiDou/GLONASS, supports RAIM, with optional CDMA support.
	UTC synchronization accuracy: 20 ns (RMS)
	Tracking and lock‑on sensitivity can reach −166 dBm.
Timekeeping function	Temperature‑compensated crystal oscillator (optional, depending on model): Timing accuracy: standard configuration优于8.6 µs/day (configuration can be upgraded 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 specific requirements).
Front panel	VFD high-brightness LCD display
	Displays GPS/BD satellite acquisition status, time, number of GPS/BD satellites, IP addresses of each network port, system operating status, and more.
	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 alarms: 1–6 pairs optional, including satellite, power supply, antenna, port capacity, and other alarm types.
	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)
	Dimensions: 1U/2U chassis
Physical Environment Parameters	Power Supply: AC 220 V ±20%, 47 Hz to 63 Hz; hot-swappable redundant power supplies available as an option.
	Operating temperature: -10°C to +55°C (equipment), -40°C to +75°C (antenna)
	Storage temperature: -45°C to +85°C
	Humidity: 95% non-condensing

With 21 years of extensive industry experience, our company has established a strong corporate reputation and brand image, serving clients in the public security sector, including:

State Administration of Radio, Film and Television; National Radio and Television Monitoring Center; Sichuan Radio and Television Network Co., Ltd.; Tianjin Radio and Television Station; Yunnan People’s Broadcasting Station; Guangxi Radio and Television Center; Inner Mongolia Radio and Television Network Co., Ltd.; Hubei Provincial Radio and Television Group; Jiangsu Provincial Radio and Television Group; Shanxi Radio and Television Network Co., Ltd.; Henan Radio and Television Network Co., Ltd.; Shanghai Culture, Radio, Film and Television Group; Xiangfan Cable Radio and Television Network Center; Tongliao Bureau of Radio, Film and Television; Guangzhou Coast Radio Station; Dali Cangshan Television Relay Station; Tianjin Radio, Film and Television and Film Group; Guangxi Radio and Television Technology Center; Jiangyin Radio and Television Network Transmission Center; Jiangxi Radio and Television Network Co., Ltd.

The choice of numerous departments and enterprises reflects recognition of Zhongxin Chuang’s products and services. Our company will continue to uphold our corporate mission of “Innovative Technology, Serving a Better Life,” working in sincere collaboration with partners across all sectors to jointly achieve win-win outcomes and shared progress for both our enterprise and society.

Zhongxin Chuangwei provides a time synchronization server to Lunan Pharmaceutical Group.

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Zhongxin Chuangwei provides a time synchronization server to Lunan Pharmaceutical Group.

Zhongxin Chuangwei provides a time synchronization server to Hangzhou Enhe Bio.