Data communication (Unit 1 :analog and digital)

Data communication (analog and digital)

 ( Topic: 

1. Analog and digital signals;
2.  periodic and non periodic signals analog signals time and frequency domains;
3.  COMPOSITE SIGNALS: Frequency spectrum and Bandwidth;
4.  TRANSMISSION MODES:
• Serial and Parallel transmission, 
• Asynchronous and Synchronous Transmission,
• Simplex,
• Half-Duplex and Full-Duplex communication.)

1.1.1 Analog and Digital Signals

1.1.2 Perodic and non perodic

1.2 Perodic anolog signals

1.2.2 composite signals

1.2.3 Bandwidth

1.2.3 Sine Wave

1.2.4 Time Period and Frequency 

1.3 Transmission Modes

1.3.1 Parallel Transmission

1.3.2 Serial Transmission

•  Asynchronous Transmission

• synchronousTransmission

Isochronous Transmission

1.4 Transmission modes

1.4.1 Simplex Transmission / Communication

Half DuplexTransmission 

Full Duplex Transmission / Communication

            Advantages and disadvantages

Q1 : Asine wave is offset 1/6 cycle with respect to the o . what is its phase in degree and radian?

Q2 : The power we use at home has a frequency of 60 Hz what is the period of its sine wave?

Q3.the time period of a signal is 100ms. what is its frequency in kilo-Hertz (Khz)

Q4. non periodic composite signal has a bandwidth of 200 KHz with a middle frequency of 140 words and peak amplitude of 20 V the frequency has an amplitude of a zero approximately draw the frequency of the signal

Q5 Assume we need to download files at a rate of 100 pages/sec . A page is an average of a 24 lines with 80 characters in each line. Where one character required 8 bits. what is the required bit rate of the channel?

Q6.A network with bandwidth of 10mbps can pass only and average 1000 frames per minute with each frame carries an average of Bits. what is the through throughput of this network?

Q7. What is the propagation in time if the distance between two points is a 12000 km? Assume the propagation speed to be 2.4 x 108metre per second in the cable.