命令通道 meaning in English

command channel
order channel

And the image information was disposed with jpeg arithmetic method to compress the data on the server , decompress the data to display it on the client . to video and audio data , we take the method of microsoft directx . in the part of transmission control , we implemented the transmission of multimedia data by ip - multicast method and udp protocol . moreover to assure the integrality and synchronization of the multimedia data , we designed and implemented application layer transfer control protocol above the connectionless lower network protocol
在传输控制方面，多媒体信息传输采用ip多播udp传输协议，设计并实现了在无连接的网络协议上的应用层传输控制协议，保证多媒体信息的完整性和同步性，建立了控制命令通道，控制命令信息传输采用tcp协议，从而既保证了控制命令的可靠传输，又提高了多媒体信息的传输性能。