Several key techniques of the system are discussed including network protocol,multicast communication,design of video decoder encoder and control module of Matrix Video Switcher.

The Ad hoc On-Demand Distance Vector(AODV) routing protocol is prevalent used in ad hoc network, it provides both unicast and multicast communication connectivity in an ad hoc mobile environment.

When multiple tree routes were selected as multicast communication solution, lower overall cost could be obtained to ensure network load balance.

Security is difficult to handle in multi-privileged group communications,because group users have multiple access privileges when subscribing different data streams.

Multi-privileged group communications are different from the traditional group communications.

Researches on the Technology of Suppressing NACK and Reliable Multicast Based on Reliable Active Node;

Secondly, this paper presents a reliable multicast protocol ba.

Reliable Multicast Protocol Based on Reliable Active Node;

The PeliCAN mode realizes call-ing and broadcasting communications between the main concentrator and slave concentrators, and the practical applications proves that this.

Programming application of asynchronous broadcast communication based on UDP with VC++6.0;

KT Company, the research object in my paper, specialized in the equipment of fire-fighting broadcast communication.