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1. Routing and switching network. A data transmission network composed of components such as firewalls, routers, behavior management, switches, and wireless networks. According to the content and quantity of user needs, flexibly recommend suitable equipment solutions, and be responsible for implementation and maintenance (including remote maintenance) 2. Local area network. The LAN is composed of servers, PCs and mainstream operating systems. Provide users with solutions, implement installation and maintenance (including remote maintenance) 3. Comprehensive wiring. The management end, horizontal end, working end, and vertical end are the conventional components of enterprise-level integrated wiring. Through the use of mainstream brand equipment, the implementation and maintenance of program-controlled telephones for users to establish high-quality and stable permanent links. Provide users with reasonable configuration, installation, commissioning and maintenance of equipment of mainstream brands (such as AVAYA, NEC, etc.). 4. Access control and monitoring. Security products have high technology maturity and less iterations and updates. By recommending equipment from mainstream brands at home and abroad, we can provide users with stable and reliable functional services, and provide installation and maintenance