Info

input

input

Base band output

Fig. 3.25. TDM transmission.

3.6.4. Digital Transmission

Since 1980's digital transmission is slowly replacing the analog switching and transmission. In digital transmission system, the message signals are converted into digital form. There are two basic modes of digital transmission. They are asynchronous transmission and synchronous transmission. Both techniques are explained in detail in transmission networks chapter. The digital transmission produces a rugged signal with a high degree of immunity to transmission distortion. The quantization noise also associated with the signal, which is the fundamental limitation on waveform reconstruction. A large bandwidth of coded PCM is used to reduce the quantization noise. The PCM loading also discussed in the transmission networks chapter.

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