[Smart Port] NTP network time server helps digital port construction
[Smart Port] NTP network time server helps digital port construction
1. System Requirements
Provide a standard clock synchronization signal for the entire port hub and various weak electronic systems (video surveillance, smart gates, broadcasting and other systems), so that the clocks of all systems in the port are synchronized and displayed synchronously.
2. System introduction
In today's rapid development of informatization, ports, airports and railway stations are important nodes in the transportation network and are closely related to the lives of the general public. , shouldering the important task of quickly transporting large flows of passengers or goods and ensuring smooth traffic, which requires the close cooperation of various departments and systems.
The installation settings of the standard clock synchronization system provide a basic guarantee for this cooperation. As ports, airports and railway companies implement speed-up strategies to improve services, higher requirements are placed on the operational efficiency of the entire transportation system. The clock system, with its characteristics of high reliability, high precision and high integrated control, provides Central dispatchers, attendants, staff of various departments and passengers in various ports, airports and stations provide unified standard time information. At the same time, they provide unified time signals for other systems, so that network equipment and satellite clocks of each electromechanical system can be real-time Maintaining synchronization to achieve a unified clock reference has gradually become one of the important technical means for modern management and monitoring of transportation in ports, airports, railway stations, etc.
3. System architecture
System architecture topology diagram:
4. System composition
The standard clock synchronization system for ports, airports and railways consists of satellite signal receiving antennas, NTP satellite clock servers (NTP network master clocks), network switches, NTP network sub-clocks It is composed of clock, transmission channel (network cable), management software, etc.
5. System advantages
5.1 Synchronous calibration
The system continuously receives the time sent by GPS/Beidou satellites through the satellite signal receiving antenna. code and its related codes, and analyze the received data to determine whether the data is authentic and reliable. If the data is reliable, it will be used by the satellite network master clock. If the data is unreliable, it will be given up and will continue to be received next time.
The network slave clock is an independent display unit that can run independently from the satellite network master clock. At the same time, it can actively request the standard time information of the satellite network master clock, and the network master clock can calibrate it in real time. In order to ensure that the received information is true and reliable, the network master clock strictly analyzes and judges the received request information to eliminate interference information.
5.2 Time display and adjustment
The digital network sub-clock time adopts the optional mode of "hours and minutes; hours and minutes and seconds; year, month, day and week". When adjusting the time, the network The slave clock sends a calibration request. After receiving the request, the satellite network master clock immediately sends the precise time information to adjust the slave clock time.
5.3 Provide time signals for other systems
The satellite network master clock is equipped with multiple NTP network interfaces (RJ45), and each network port has an independent MAC address to communicate with each other. Physical isolation does not affect each other's work and can always be ready to provide time synchronization signals for airports, train stations and other subsystems. The main systems include: communication transmission system, wireless communication system, dispatch telephone system, cable broadcast system, closed-circuit television surveillance system, security monitoring system, ATS system, SCADA system, FAS system, AFC system, EMCS system, etc.
5.4 System monitoring function
Set up a computer system to manage and monitor the clock system in the control center. It has a self-diagnosis function and can perform fault management, performance management, and configuration management. , safety management, etc.
The management computer in the center can detect the operating status information of the sub-clock equipment and display the detected fault status. It can reflect the status of each module within the system in real time and detail, and can The whole system clock performs point-to-point control (reset, stop, proofreading, time tracking, etc.).
When the system fails, it can send out an audible and visual alarm to indicate the fault location, synchronously transmit the fault alarm, provide it to the staff in the duty room, and perform fault recording and printing.
5.5 System scalability
When the system is expanded, the center’s network master clock can be expanded in real time through expansion equipment to meet the needs, which facilitates the addition of network sub-clocks at each site. Work.
5.6 Distributed control
The system adopts distributed control function, that is, a distributed system. The central network master clock and the network sub-clock are connected to each other through Category 5 and Category 6 shielded network cables. It is connected in different ways and is relatively independent in the entire system. Failure of any part will not affect the operation of the entire system.
6. Product introduction
6.1 Satellite receiving antenna
6.1.1 Electrical characteristics:
a. Cable length: 30 meters
b. Cable specification: SYV-50-3
c. Connector specification: BNC connector< a i=24> d. Operating frequency and bandwidth: 1575.42MHz, 20MHz e. Minimum standing wave ratio (VSWR): 1.5: 1 f. Signal Direction: hemispherical upward g. Gain: 40dB±2dB h. Noise: 1.6dB i. Operating voltage : 5V±0.5 DC j. Working current: 25mA 6.1.2 Physical characteristics: a. Size: Φ93mm x 138mm b. Feeder length: 30 meters c. Interface: BNC d. Working temperature: - 40℃～ +85℃ e. Storage temperature: - 40℃～+100℃ 6.2 NTP clock server (master clock) 6.2.1 Product features: ◆ High precision, serial port/pulse up to 30ns, NTP client better than 2ms, fast time synchronization. ◆ Dual CPUs work simultaneously, 32-bit CPU dual-core processor, using DSP/CPLD technology for high-speed processing; ◆ The satellite time source signal adopts GPS+Beidou two-in-one Mixed working mode (GPS and Beidou number can be displayed); ◆ Support 4 independent 10/100M network ports (each port has an independent MAC address) and 4 serial ports, and the interfaces can communicate with each other Physical isolation does not affect each other's work, the chassis is 1U rack-mounted design, and the network port can be flexibly configured; ◆ As a first-level clock server, it can provide data for tens of thousands of clients, servers, and workstations at the same time time service. ◆ Supports WINDOWS9X/NT/2000/XP/2003/vista, LINUX, UNIX, SUN SOLARIS, IBM AIX, HP-UX and other operating systems and all network devices that support NTP protocol. ◆ Multiple configuration methods (SOFT/WEB), easy to manage and upgrade, support MD5 encryption and SNMP network management; ◆ The device supports NTP and SNTP protocols, which must be Enables computer networks and their network devices to automatically and accurately synchronize time without additional programming. ◆ Dedicated embedded system, no hard disk and fan design, shock-proof design, the system is stable and reliable. ◆ The chassis is anti-magnetic and has strong anti-interference ability. ◆ The satellite receiving antenna focuses on lightning protection design, stability design, and anti-interference design. The signal reception reliability is high and is not restricted by regional conditions and environment. ◆ The device has a variety of serial information output and interaction methods to meet the needs of different users. ◆ The serial port signal output is programmable and easy to operate. ◆ The device can display the year, month, day, hour, minute and second and the current number of GPS and Beidou satellites through the LCD screen. ◆ Rack-type structure, 1U, 19” standard chassis, easy to install. 6.2.2 Product parameters: Name Technical Parameters Capture Satellite Time device cold start ≤1—3min Device ≤1min during hot start Instantaneous power outage and restart ≤20s Timing accuracy 30ns (UTC synchronization accuracy) Network timing accuracy 1 -10ms (typical value within 5ms) Network Time Protocol NTPv1.v2.v3&v4, SNTP, TELNET, DHCP, UDP, SNMP Client throughput Measure 65,000 times/second LCD display shows the current number of GPS and Beidou satellites and the time information of year, month, day, hour, minute and second
The default serial port information baud rate is 9600, 8 data bits, no parity, 1 stop bit
The standard satellite receiving antenna is 30 meters, and 50 or 50 meters can be selected according to the actual environment. 100, 200 meters
Size 1U: 483×44×210mm
Weight 2.8KG
Power supply 220V ±20%, 47Hz～ 63Hz (three-in-one socket)
Working temperature and humidity -200C～+700C; <95% non-condensation
Storage temperature -400C～+850C a> Installation method—indoor wall hanging Dimensions—diameter 300mm, 400mm Power consumption—less than 0.3 w Input power supply—220 ~ 240vac or 12vac (when ordering Specified) Power failure memory—10 years Working humidity—0% ~ 95%, no condensation Operating temperature----20°C ~ 50°C Hour and minute hand unsuitability—less than 8 ° Synchronization error—0.1ms Shell material—metal shell, brushed surface Interface type—NTP network port Operation mode—automatic operation, automatic calibration Central control—single-chip microcomputer Clock face hands—hour and minute hands/hour, minute and second hands Product type—analog two-stage clock 6.3.1 Pointer network sub-clock 6.3 NTP network sub-clock Software upgrade provides users with free system time software upgrades for life Technical support provides free telephone, email and other technical support services to users Free guarantee: When the product fails, the purchaser will directly contact the company for replacement Quality assurance products include 3-month replacement and free warranty within 1 year MTBF ≥95000H
Power consumption ≤15W
6.3.2 数字式网络子钟
◆ Display content: hours, minutes and seconds (red 5 inches) single/double-sided display optional;
◆ Overall dimensions: 7718 a>5cm;
◆ Interface: RJ45 (NTP) network port automatic synchronization, optional CDMA wireless;
◆ Power supply: AC220V mains power Optional POE;
◆ Travel time accuracy: 0.1S/day;
◆ Environmental requirements: -20℃～+75℃;
◆ MTBF: ≥60,000 hours;
◆ High brightness digital tube, long life.
◆ Frosted PC panel, anti-glare and non-glare.
◆ Ultra-thin metal shell design, electrostatically sprayed.
◆ The Chinese characters of year, month, day and week are self-illuminating.
◆ The computer can remotely turn on the display screen, turn off the display screen, centralized management, point-to-point monitoring;
◆ The computer can remotely control the screen brightness to automatically adjust at night and during the day.
7. System summary and classic cases
7.1 System summary:
The standard clock synchronization system not only facilitates accurate timing for enterprises and institutions, but also provides They have greatly improved work efficiency. The improvement of efficiency means the improvement of social public services. The strong attention paid to time by enterprises and institutions is a testimony to their awareness of service and efficiency.
With the establishment of big data in various units, the number of network equipment and servers continues to increase. When network administrators check the logs of many network devices, they often find that the time is inconsistent. Even if the time is set manually, there will be time errors caused by factors such as time zone or daylight saving time. After some Layer 2 switches are restarted, the clock will be restored to the initial value. Need to reset the time. For core network equipment and important application servers, they sometimes need to work together, so the unified accuracy and reliability of time are particularly important.
At the same time, the clock system has industry-leading environmental protection performance, leading the urban green office trend. As the pace of modern life continues to accelerate and the Internet becomes more popular, the demand for time accuracy is also getting higher and higher, especially in current ports, airports, railways (subway/train stations), hospitals, schools, government agencies, Enterprises and institutions cater to their needs and solve real problems for them.
7.2 Classic cases of system application:
Qinghai-Tibet Railway Company, Guangzhou Railway Group Company, Sanya Phoenix International Airport, Ningdong Railway Co., Ltd., Suzhou Expressway Management Center, Hebei Provincial Expressway Chengqin Expressway Management Office, Jilin Railway Station, Jiqing Expressway Management Center, Zhuzhou General Airport, Jianhu General Airport, a research unit affiliated to China Shipbuilding Industry Corporation, Xinjiang Hami Company of Huadian Group, Gezhouba Hydropower station project, Dujiangyan Hydropower Station project, Xiangdian Group substation project, Dongguan Power Supply Bureau, Zhuzhou Yanling Power Supply Bureau, Yunnan Aluminum Steel 10KV automation system, Yangmei Group Power Plant, Nari Electric, Shaanxi Yan'an City 10KV substation automation system, Shanxi Mingshi Joint-stock company pipeline monitoring system, Fushun Hanwang Lagu Iron Works, Tangshan Ruifeng Iron and Steel Group, Guangdong Provincial Atmospheric Detection Technology Center, Nantong Environmental Protection Company sewage treatment plant system, Wuhai Thermal Power Company, Hanzhong Cigarette Factory, Hebei Huadian Hybrid Energy Storage Hydropower Co., Ltd., PetroChina Daqing Petrochemical Company, PetroChina Gas Bed Co., Ltd., a national key laboratory of PetroChina, a coal mine automation system of Shenhua Group, Shanxi Coal Consumption Group, Sinopec Puguang Gas Field, State Grid Jilin Electric Power Co., Ltd., Telecom Technology No. Five Research Institutes, Gansu Lanzhou Tendering and Tendering Management Center, Sinopec Hubei Fertilizer Plant, China Coal Science and Technology Group, Guizhou Pan County Safety Supervision Bureau, Lanzhou Public Resource Trading Center, CNOOC (Taizhou) Petrochemical Co., Ltd., Xinpu Chemical (Taixing) Co., Ltd., Xinjiang Zhongtai Chemical Co., Ltd., Hunan Province Zhuzhou Municipal Finance Bureau, Shandong Dongyue Chemical Co., Ltd., Chongqing Zhongyu Plaza Weak Current Phase I and Phase II, Ningxia Public Resources Trading Center, Inner Mongolia Mataihao Coal Mine, Nine Dragons Paper Co., Ltd., Nine Dragons Paper Vietnam Zhengyang Paper Mill, Ministry of Commerce Training Center Computer Room Construction, Military Transportation Research Institute, Hong Kong-Zhuhai-Macao Bridge, ROCKWELL Nigeria Project, Fujian United Petrochemical Co., Ltd., Yongzhou City Finance Bureau of Hunan Province, Aerospace Second Institute of Technology, SDIC Xinji Liuzhuang Coal Mine, a certain military unit in Heilongjiang, Huaneng Beijing Thermal Power Co., Ltd., Shenyang Jiulong Paper Phase II Power Plant, Ordos City Yijinhuoluo Banner Public Resource Trading Center, Lianyungang Financial Building, Tianjin Tiangang United Special Steel Co., Ltd., Shanxi Coal Transportation and Marketing Group Linfen Pu County Co., Ltd., Sanmenxia Huayang Power Plant, Gansu Liangdang County Water Plant, Beijing E-Commerce Central District Investment Co., Ltd., Guodian Jingyang Energy Co., Ltd., Beijing Municipal Public Security Bureau, Hainan Provincial Public Security Department, Quanzhou Municipal Public Security Bureau, Changshu Municipal Public Security Bureau, Kunshan Municipal Public Security Bureau Traffic Police Brigade, Zhengzhou Municipal Public Security Bureau Command Center, Maanshan Municipal Public Security Bureau Traffic Police Brigade, Yichuan County Public Security Bureau Traffic Police Brigade, Dongfeng County Public Security Bureau Traffic Police Brigade , Qinhuangdao Unit 91336, Beijing Changping Procuratorate, Chongqing Prison Administration, Zhejiang Shiliping Prison, Guangzhou Yuexiu District Taxation Bureau, Jinan Prison Management Command Center, Yunnan Prison Administration, Kaifeng Civil Defense Office, Sanya Yalong Bay Resort Hotel, Zhaotong City Zhaoyang District Traffic Police No. 1 Brigade, Yunnan Provincial Public Security Department Traffic Police Corps, Xining City Civil Defense Office, Ganquan County Public Security Bureau Traffic Police Brigade, Yongzhou City Public Security Bureau Vehicle Control and Inspection System, Yunnan Province Zhaotong City Zhaoyang District Public Security Bureau, Yuxi City Public Security Bureau of Yunnan Province, Yangjiang City Public Security Bureau of Guangdong Province, Qingyuan City Public Security Bureau of Guangdong Province, Tongcheng County Public Security Bureau of Hubei Province, Baishan City People's Procuratorate of Jilin Province, Guangzhou Military Region General Hospital, Shenzhen Fourth People's Hospital, Panzhihua City Middle School Phase I and II of Integrated Western Medicine Hospital, the First Affiliated Hospital of Kunming Medical University, the First Affiliated Hospital of Zhengzhou University, Xinjiang Production and Construction Corps General Hospital, Cancer Hospital Affiliated to Xinjiang Medical University, Beijing Boren Hospital, Tianjin Medical University General Hospital, Pingdingshan City No. Second People's Hospital, Urumqi Friendship Hospital, etc.;