1. System Overview
The main purpose of this system is to provide a precise and unified time standard, which can provide timely and accurate nursing time reference for special care patients and critically ill observation patients for the staff of the hospital's nursing station. With the intelligent digital clock system, anesthesia rooms, operating rooms, oxygen supply respiratory systems, medical intercom systems, queuing systems, etc., there is no longer a need to manually check the clock to time. The digital clock system's built-in display functions of school time, lunar calendar, temperature, and humidity can provide accurate data reference, ensuring the coordinated and unified operation of various departments in the hospital.
Hospitals are highly specialized places that use a large number of medical and office equipment. These medical devices, office computers, monitoring instruments, etc. all have independent timing functions. If there is a deviation in the timing of these devices, it will cause significant losses and accidents to the operation of the hospital (for example, if there is a deviation between the time of the information department and the equipment of the inpatient department, it will cause untimely updates of patient information in the nursing intercom system; if there is a large error between the time of the patient medical record uploaded by the nurse and the time of the doctor receiving the medical record, it will not only cause confusion in data statistics, but also may cause medical disputes).
The digital clock system can unify the time of the entire office network and computer network within the hospital, providing them with accurate time reference.
Computer network: With the increasing number of hospital devices and servers, these devices have their own clocks that can be adjusted. However, it cannot be guaranteed that the time of all devices and hosts in the network is synchronized because these clocks produce errors of several seconds or even minutes every day. After long-term operation, the time difference will become larger and larger, and this deviation will not have a significant impact on a single machine, but it may cause unexpected problems when applied in a network environment. In a distributed computing environment, if the time of each host is not consistent, it will cause the same operation to have inconsistent recording times on different hosts, which will result in the inability of services to operate normally. With the continuous development of various network applications, the demand for time is also increasing. If accurate time synchronization cannot be achieved, we will have to spend a lot of time solving various possible problems.

2. Design guiding ideology
The digital clock system selected for this project ensures that in the design:
1) Seriously implement the relevant "norms" and "standards" issued and implemented by the state, ensuring that the design does not deviate from the track of standardization and normalization, thereby ensuring the level and quality of the design;
2) The system design should be based on the principles of reliability, practicality, advancement, and economy;
3) Strive to reduce engineering and maintenance costs while meeting functional requirements;
4) The system is easy to operate, reliable, easy to expand and maintain, and the software has the ability to improve;
5) The system meets the on-site conditions and environment, and has strong resistance to high temperature, high humidity, low temperature, typhoon, electromagnetic interference, as well as lightning, rain, and dust prevention capabilities.

3. System Overview
This system adopts a master clock system based on Beidou GPS satellite reception to achieve unified time within the hospital.
The digital sub clock communicates with the management workstation and central master clock through the hospital intranet, and each digital sub clock is assigned an IP address to achieve unified time verification.
The staff of the nursing station provide timely and accurate nursing time reference for special care patients and critically ill observation patients. With the intelligent digital clock system, anesthesia rooms, operating rooms, oxygen supply respiratory systems, medical intercom systems, queuing systems, etc., there is no longer a need for manual timekeeping. The digital clock system's built-in timing and temperature and humidity display functions can provide accurate data reference, improve the level of hospital diagnosis and treatment automation, comprehensive management intelligence, and information integration, and construct various information systems through information exchange and interoperability. Ultimately, an information-based and digital hospital with complete diagnostic and treatment methods, scientific management, integrated information, and efficient energy conservation will be formed. The construction of a digital clock system plays an important role in ensuring accurate timing of hospital operations and improving the quality of operational services.

4. System composition and characteristics
This digital clock system mainly consists of GPS/Beidou receiving antenna, central master clock The NTP server, system management terminal (including timing management software), various sub clocks, power supply, and transmission channels are composed.
Adopting a network transmission method, the system is transmitted step by step from the front-end to the back-end, and the back-end is synchronized with the front-end. The same level is independent of each other, ensuring the reliable operation of the system.
The system centrally manages the front-end digital sub clock through the hospital intranet, and uniformly calibrates the working computers, display devices (waiting call signal display screen, nursing response signal corridor display screen, etc.), medical technology equipment, etc. of medical staff within the network.
GPS/Beidou receiving antenna: located on the rooftop, real-time receiving of Beidou GPS satellite time sends a time signal to the central master clock through the BNC interface to achieve precise calibration of the internal clock of the master clock, enabling it to operate without accumulated errors.
Central master clock: As the basic master clock system, it contains a time signal receiving unit module that automatically receives Beidou signals The standard time signal provided by GPS satellites calibrates their own time accuracy, and through the transmission system, the precise time signal is sent to sub clocks and other weak current systems in various regions that require standard time signals, thereby achieving time synchronization for all equipment in the hospital area.
NTP server: Receive the master clock time signal as the reference, equipped with an independent IP Ethernet interface, connected to the hospital intranet, and uniformly adjust the time of all computers, display screens, and other equipment terminals connected to the hospital intranet.
Management software: installed on the management workstation of the information room, with built-in delay algorithm protocol, it can detect the operating status of the main equipment of the hospital digital clock system, display the working status and fault status of the system, and centrally manage, set, and monitor the front terminal clocks in the hospital area.
Front terminal clock: It adopts the network NTP method to receive the time signal sent by the master clock and display the time. It has independent timing function and tracks the operation of the master clock in daily life. When the master clock malfunctions or cannot receive the standard time signal due to other reasons, the slave clock can still operate with its own accuracy. Single sided installation is wall mounted, while double-sided installation is suspended.

5. System topology diagram


6. Device deployment
The system management center is located in the information room, and the central master clock set up in the management center The NTP server and clock system network management computer (timing management software) are responsible for centralized management of the front terminal clocks in the campus.
The digital sub clock is mainly installed in key areas such as nurse stations, triage tables, medical offices, emergency rooms, display rooms, operating rooms, conference rooms, public areas, and main passages on each floor.
Equipment list:


7. Installation/Construction Instructions
GPS/Beidou receiving antenna: used in conjunction with the central master clock, installed on the roof above the information room, connected to the central master clock in the room through a 50 Ω feeder, and equipped with a feeder lightning arrester.
Central master clock: installed on the cabinet of the computer room, powered by 220VAC, the network timing port is connected to the core switch through a Category 6 network cable, and other output ports (serial/B code, etc.) are connected to the required equipment through communication cables.
NTP server: installed on the cabinet of the computer room, powered by 220VAC, with the network timing port connected to the core switch through a Category 6 network cable.
Single sided pointer type sub clock/single sided calendar type sub clock: wall mounted installation, connected to the weak current room floor switch through a network cable. The installation position of the sub clock needs to reserve a 20mm conduit from the weak wire slot, which should be concealed along the wall or laid in the ceiling; Provide nearby 220VAC power sockets; The height from the bottom to the ground should be ≥ 1.8m, depending on the actual decoration situation on site.
Double sided digital sub clock: Hanging installation, connected to the floor switch of the weak current room through a network cable. The installation position of the sub clock needs to reserve a 20mm conduit from the weak wire slot, which should be concealed along the wall or laid in the ceiling; Provide nearby 220VAC power sockets; The height from the ceiling should be ≥ 0.2m, depending on the actual decoration situation on site.