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Nyquist Bandwidth

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11. Considering only the Nyquist bandwidth limitation. Determine the bandwidth required of the media (at Point D) given the following:

a. 20-analog voice signals digitized using standard G.711 PCM; a TDM multiplexer with an added output overhead of 15%; and a modem that employs QPSK modulation.

b. Repeat part "a" for 16-ary QAM modulation.

c. Repeat part "b" using 16-ary QAM modulation. Each standard G.711 PCM digitized voice signal is compressed using a 4:1 ratio before going into the multiplexer. In addition the multiplexer is inserting a 1-kbps control signal for each input in addition to the general overhead.

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Please reference this figure for the question:

11. Considering only the Nyquist bandwidth limitation. Determine the bandwidth required of the media (at Point D) given the following:

a. 20-analog voice signals digitized using standard G.711 PCM; a TDM multiplexer with an added output overhead of 15%; and a modem that employs QPSK modulation.

b. Repeat part "a" for 16-ary QAM modulation.

c. Repeat part "b" using 16-ary QAM modulation. Each standard G.711 PCM digitized voice signal is compressed using a 4:1 ratio before going into the multiplexer. In addition the multiplexer is inserting a 1-kbps control signal for each input in addition to the general overhead.

G.711 (PCM: Pulse code modulation) is an international standard and widely used in the conversion of analog voice signals for use in digital transmission networks. The G.711 quality and characteristics are widely used as a reference point when new or improved algorithms are used in testing. Two ...

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• BCom, SGTB Khalsa College, University of Delhi
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