Voice-grade definitions

The bandwidth required to transmit human voice, which is about 4,000 Hertz (4 kHz). The term may refer to an analog telephone line, but also to a digital line that supports the digital equivalent of voice (see DS0). Depending on the context of usage, the term may refer to a channel that is a step up or a step down from another type.
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Bandwidth sufficient to support voice communications. In analog transmission systems, a standard voice grade narrowband channel has nominal bandwidth of 4,000 Hz (4 kHz), which is the standard for analog voice. Within that channel and as illustrated in Figure V-1, the 0
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