How many frequencies does a full-duplex QAM-64 modem use?
Answer to relevant QuestionsAn ADSL system using DMT allocates 3/4 of the available data channels to the downstream link. It uses QAM-64 modulation on each channel. What is the capacity of the downstream link?Compare the maximum data rate of a noiseless 4-kHz channel using (a) Analog encoding (e.g., QPSK) with 2 bits per sample. (b) The T1 PCM system.To accommodate lower data rates than STS-1, SONET has a system of virtual tributaries (VT). A VT is a partial payload that can be inserted into an STS-1 frame and combined with other partial payloads to fill the data frame. ...Make a rough estimate of the number of PCS micro cells 100 m in diameter it would take to cover San Francisco (120 square km).A cable TV system has 100 commercial channels, all of them alternating programs with advertising. Is this more like TDM or like FDM?
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