Chapter 3: Physical Layer 1. Clearly explain the differences between analog data

Question

Chapter 3: Physical Layer 1. Clearly explain the differences between analog data, analog transmission, digital data, and digital transmission. 2. Approximately how many bytes are required to store this document (text-only) ina computer or transfer over the network? Hint: There are approximately 940 words in this document. Assume each word word. Also, assume we are using 8-bit ASCII codes. I suggest you try saving this document as plain text (txt) file (i.e., copy and paste the whole text into the notepad application) and check out the file size What are the key benefits of digital transmission over analog transmission? Describe at least four benefits. What is multiplexing? What are its advantages? Explain how Frequency/Time/Statistical Time Division Multiplexing works. What is the difference between a bit rate and a baud rate? If a circuit has 10MHz bandwidth and uses 64-QAM (6 bits per symbol), calculate its maximum data rate in bits per second. averages five letters and there is one space between each 3. 4. 5. 6. One version of Unicode called UCS-2 uses 16 bits per character. How many characters can this coding scheme represent? How many hexadecimal digits are required to represent UCS-2 character? 7. What is the binary number represented by the following signal that uses Manchester encoding? 8. There are Mini CDs, or "Pocket" CDs which have a smaller diameter and a smaller capacity than a regular CD has. The low density version can hold 18 minutes of audio data and uses the same sampling rate (44,100 Hz), same bits for amplitude level (16-bits 65536 levels), and same number of channels (stereo). What should be the minimum capacity (in MB] for this Mini CD? 9. Suppose UNC Charlotte VolP system has a function that can forward a user's voice mails to his or her email address with a wave file attachment. How large in KB would a 1 minute and 30 seconds of voice data in the attachment? Assume that the voice mail keeps the typical PCM format used for telephone, (ie., 8 bits (1 Byte) for the amplitude level and sampling is done at the rate of 8000 per second.

Explanation / Answer

Solution 1 : "Analog Data" is the data which is produced by Analog Signals after using the continuous electric currents and voltages. Similarly , "Digital Data" is the data which is produced by Digital Signals after using binary data strings (0 and 1) .  

"Analogue data" have continuous form, whereas "Digital data" have discrete values.

"Analog Transmission" is the method to transfer Analog Signals ( Analog Data ) with the help of continuous signals. Whereas "Digital transmission" is the method to transfer Digital Signals ( Digital data or messages ) discretely.

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