| 单词 | TDM (Time-Division Multiplexing) |
| 释义 | TDM (Time-Division Multiplexing) A multiplexing method by which multiple low-speed incom- ing transmissions can share a single high speed outgoing digital circuit. An analog voice conversation requires bandwidth of 4 kHz.Although there are a considerable number of methods for converting an analog voice signal into a digital signal, the fundamental standard is pulse code modulation (PCM), which requires 64 kbps. A voice grade digital channel, therefore, is 64 kbps wide, which forms the fundamental building block for digital switching and transmission of not only voice, but all forms of data. A typical digital voice application is multi-channel in nature and involves a four-wire circuit with a TDM multiplexer, or mux, placed on each end of the circuit, as illustrated in Figure T-3. |
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