Abstract:The advantages and disadvantages of several short-range wireless transmission technique were introduced in this paper. Based on the actual functional requirements, SCM as the control core, HLK-WI-FI-M03 and modular design idea, wireless water level monitoring system is designed. Wireless communication control, real-time data display and water level switch control were implemented.

Abstract:In order to speed up construction of the Next Generation Internet and broadband optical network and to promote the combination of information technology and traditional industry, a distributed network access control method for large-scale campus network has been studied in this paper. With the connection-oriented features in TCP protocol, the first handshake packet and the other transport packets are sent to network control server and cut-off gate way, respectively. In order to achieve a highly efficient user access and data forwarding speed, the TCP connection packets were authenticated only in the control server.