论文部分内容阅读
如何通过帧中继网传输语音在将电话呼叫信号送往公用网络之前，数字语音交换机利用脉冲编码调制（ＰＣＭ）把模拟语音信号转换成数字比特流。伴随ＰＣＭ编码而进行的取样，产生８ｂｉｔ字为单位的数据流．速率为６４ｋｂｉｔ／Ｓ。当数据流送入帧中继交换机时，交换机运用...
How to Transmit Voice over a Frame Relay Network Digital voice switches convert analog voice signals to digital bit streams using pulse code modulation (PCM) prior to sending telephone call signals to the public network. Samples taken with PCM encoding produce a data stream in 8-bit words. The rate is 64kbit / s. When the data flow into the Frame Relay switch, the switch uses ...