...is a line coding technique in which a logical “1” or “0” is represented by a
ID: 3722144 • Letter: #
Question
...is a line coding technique in which a logical “1” or “0” is represented by a voltage transition (e.g., low-to-high or high-to-low voltages) in the middle of the clock cycle.
a. NRZ b. Manchester c. Bipolar AMI d. B8ZS
Which timing and data synchronization method depends upon the data to recover timing.
a. Asynchronous b. Synchronous c. Isochronous d. Plesiochronous
Select the correct statement(s) regarding “error correction”.
a. “error correction” techniques can be classified as either “error detection” or “error correction”
b. Forward error correction (FEC) depends upon the addition of redundant data bits to correct bit errors during transmission
c. Use of “parity bits” and Cyclic Redundancy Check (CRC) enables “error detection”, but not “error correction”
d. All statements are correct
...is noise caused when the frequency bandwidth of adjacent channels overlap with one another, thus causing distortion on each channel.
a. Thermal noise b. Intermodulation noise c. Cochannel interference d. Impulse noise
Explanation / Answer
Answer)
1) a. Manchester is a line coding technique in which a logical “1” or “0” is represented by a voltage transition (e.g., low-to-high or high-to-low voltages) in the middle of the clock cycle. (This is because Manchester is somewhat combination of the RZ and NRZ-L techniques. The voltage remains at one level during the first half and moves to the other level in the second half in the middle of the clock cycle.)
2)
Which timing and data synchronization method depends upon the data to recover timing.
a. Asynchronous b. Synchronous c. Isochronous d. Plesiochronous
Isochronous timing and data synchrnozation method depends upon the data to recover timing. Isochronous functions as sending sends Asynchronous data over a Synchronous transmission system. Thus each data source is given only a fixed time to transmit its data.
3)
Select the correct statement(s) regarding “error correction”.
a. “error correction” techniques can be classified as either “error detection” or “error correction”
b. Forward error correction (FEC) depends upon the addition of redundant data bits to correct bit errors during transmission
c. Use of “parity bits” and Cyclic Redundancy Check (CRC) enables “error detection”, but not “error correction”
d. All statements are correct
b) statement is True as FEC depends upon the addition of redundant data bits to correct bit errors during transmission. Use of “parity bits” and Cyclic Redundancy Check (CRC) enables “error detection”, but not “error correction” - This statement is False, as CRC can be used for error detection and also correction. Also techniques can be both error correction and error detection. So b) is True.
4) b. Intermodulation noise is noise caused when the frequency bandwidth of adjacent channels overlap with one another, thus causing distortion on each channel. Intermodulation noise occurs when the frequency bandwidth of adjacent channels overlap with one another and results in distortion in the channels.
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