Base band output
Fig. 3.25. TDM 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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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.