【摘要】 利用媒体网的电话系统相当于一个机顶盒,留有电话接口和网口,家用电话插上后可以利用MP网拨打电话.在拓扑上处于Medianet骨干网与用户的连接处,属于接入网部分.整个系统由电话控制芯片,编解码芯片和FPGA整体控制组成,遵循8kbyte/s的速率对语音信号采样并在下行用100M网口(RJ45)与MP设备(M-BOX)连接.基于MP网络的电话系统数据不做存储,而是直接打包成协议格式发送出去保证实时性.由于不使用IP网络,故未采用TCP/IP协议,而用FPGA按MP网专用协议组包.系统测试比对传输前后数据,仿真图正确.更多还原

【Abstract】 The telephone system as a STB has telephone interface and network interface,a phone call can be made while it entered the MPnet.It is in the connection of backbone MPnet and the users in analysissitus,so the system belongs to the section of connecting network.The whole project is made up of a SLIC,codec chip and FPGA.The sample rate of voice is 8 kB/s and a 100 M net port(RJ45) connects with MP device(M-BOX) which will send the data.There needs no power server for MPnet but broad bandwidth.For basing on Mpnet,it works on MP protocol instead of IP.The figures in system test contrasts the data to be transmitted and received.更多还原