1. Scalability.A distributed architecture and modular design should be adopted to support system expansion, additional functionality, and supporting software upgrades. Users should be able to expand or scale down the system as needed, ensuring sufficient flexibility.
2. Ease of System Upgrades and Maintenance.Given the scale of the system, system software and core equipment should support automated upgrades and maintenance. In addition, a citywide networked surveillance and alarm system comprises multiple complex subsystems, including networks, storage, operating systems, platform software, and various field devices. Each subsystem, including its modules and core equipment, should therefore maintain operational logs.
3. System Management and Ease of Use.Given the scale and complexity of the networked system, the management software platform should have a robust architecture, with a clear separation between core system management and application management to meet different application requirements. The large number of management, storage, and forwarding servers requires powerful network management capabilities to support routine maintenance. Management and user interfaces should be clear, concise, and user-friendly. Controls should be simple, flexible, and easy to learn and use, facilitating management and maintenance.
4. Reliability and Stability.The system should use proven technologies and reliable equipment, with backup or redundancy measures for critical equipment. System software should be maintainable and provide strong fault tolerance and recovery capabilities to maximize stable uptime and enable prompt repair or recovery in the event of a failure.
5. Compatibility and Standardization.Compatibility is essential for interconnecting equipment from different manufacturers using different protocols. The system should enable effective communication and data sharing, maximizing compatibility and interoperability between devices and systems. Higher levels of standardization and openness help extend the system’s service life. Control, transmission, and interface protocols, audio and video codecs, and audio and video file formats should comply with applicable national or industry standards.
6. System Security and Protection.System security covers several areas, primarily preventing access by unauthorized users and devices. In addition to applying appropriate levels of authentication to different users, including administrators and regular users, the system must prevent unauthorized devices from connecting. Networked surveillance systems are particularly vulnerable to hacking and should employ effective safeguards against unauthorized access, attacks, and virus infections. Comprehensive protection should also address lightning strikes, overloads, power outages, electromagnetic interference, and deliberate damage.
7. Support for Custom Development.A citywide networked surveillance and alarm system may include anywhere from several hundred to tens of thousands of cameras, making the platform’s long-term development a key consideration. To achieve the goal of creating value from video, the system must support custom development so that the platform’s video resources can be fully utilized.
8. Technological Advancement and Legacy Integration.Building a citywide networked video surveillance and alarm system does not mean discarding all existing, predominantly analog systems. The appropriate approach is to plan an all-digital system while integrating existing analog systems wherever possible. Ideally, the two should connect seamlessly to form a comprehensive citywide video surveillance network.
9. Practical Suitability.The system should account for local environmental conditions, surveillance targets, monitoring methods, maintenance requirements, and investment scale. It should support the normal operation of the citywide networked video surveillance and alarm system and meet public safety management needs.
10. Cost Performance.Designers should define system functions appropriately, configure the system correctly, and select suitable equipment. Overall costs should be kept low while ensuring high-quality critical equipment, delivering strong value for money. Particular attention should be paid to camera selection and backend software quality. If camera resolution is below 460 lines, even the best downstream system cannot deliver clear images. Some applications also require advanced features such as wide dynamic range.
