What is a circuit describe the two-wire and four-wire


Answer the following questions in details

Question 1: What is a circuit?  Describe the two-wire and four-wire circuits.  What device boosts a weak signal (analog/digital)?

Question 2:  What is a channel?  Distinguish between a CPE switch and a Network switch.

Question 3:  Define virtual circuits (VCs) and PVCs.

Question 4:  Define frequency, wavelength, amplitude, phase, and bandwidth.

Question 5:  Discuss the characteristics of analog and digital networks.

Question 6: Describe how digital signals are transmitted over an analog circuit and analog signals over digital circuit.

Question 7: Differentiate between the following multiplexing techniques in terms of mechanics, technology, and applications.

(a)  FDM;              (b)  TDM;        (c)  STDM

What are the key shortcomings of TDM and how does STDM seek to overcome these?

Question 8: Describe WDM/DWDM.

Please keep it simple and short and no copy and paste or at least help me get started?

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Electrical Engineering: What is a circuit describe the two-wire and four-wire
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