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Baseband

A communication medium that supports only a single communication signal at a time. A form of modulation in which data signals are pulsed directly on the transmission medium without frequency division and usually utilize a transceiver. In baseband, the entire bandwidth of the transmission medium (cable) is utilized for a single channel. It uses a single carrier


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A modulation technique in which the carrier frequency is shifted by an amount proportional to the value of the modulating signal. The amplitude of the carrier signal remains constant. The information signal causes the carrier signal to increase or decrease its frequency based on the waveform of the information signal.
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One of several technologies used to separate multiple conversation transmissions over a finite frequency allocation of throughtheair bandwidth. TDMA is used to allocate a discrete amount of frequency bandwidth to each user in order to permit many simultaneous conversations. However, each caller is assigned a specific time slot for transmission.
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An older technique in which the available transmission bandwidth of a circuit is divided by frequency into narrow bands, each used for a separate voice or data transmission channel, which many conversations can be carried on one circuit.
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The most common and most important method that a telephone system in North America can use to sample a voice signal and convert that sample into an equivalent digital code. PCM is a digital modulation method that encodes a pulse amplitude modulated signal into a PCM signal.
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An ISDN service type that provides two B, or data, channels and one D, or management, channel. Each B channel offers 64 Kbps, and the D channel offers 16 Kbps. Supports a total signaling rate of 144 kbps, which is divided into two B or bearer channels running at 64 kbps, and a D or data channel runing at 16 kbps. The bearer channels carry the actual voice, video, or data information, and the D channel is used for signaling.
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