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[SOWHAT0819]

Which is not true about CRC 12?
Show answer choices
A. none of the choices

B. to determine the CRC remainder, the data is appended with 12 0's then divided by the CRC dividing polynomial (wrong answer)

C. the CRC remainder is consisting of 12 bits

D. the CRC 12 dividing polynomial is consisting of 12 bits

E. the transmitted signal is the original data with the appended CRC.


Given CRC 12 and implementing it as a dividing circuit, how many XOR logic gates (not the number of IC) are needed?

A. 13 (wrong answer)
B. 5
C.12
D.12

In a CRC dividing circuit what is the purpose of the shift register?

Show answer choices
A.it serves as the input (wrong answer)
B.none of the choices
C.its is used for synchronization
D.as a storage device
E.to power up the circuit


Which M-ary encoding technique uses 4-bit input

Show answer choices
A.QPSK (wrong answer)
B. BPSK
C. 16PSK
D. 8QAM


Given CRC 12 and implementing it as a dividing circuit the 1st XOR block in the circuit performs XOR between


Show answer choices
A.the data input and the 1st shift register block (wrong answer)
B.the 1st and 2nd shift register block
C.the data input and the last shift register block
D.the first and the last shift register block



In the CRC dividing circuit, synchronization is provided by

Show answer choices
A. XOR
B. shift registers (wrong answer)
C. switches
D. 555 timer


Which digital modulation technique is the baud rate not equal to its bit rate?

Show answer choices
FSk
QPSK
BPSK
ASK (wrong answer)



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[🤖]

Which is not true about CRC 12?

A. none of the choices

B. to determine the CRC remainder, the data is appended with 12 0's then divided by the CRC dividing polynomial (correct answer)

C. the CRC remainder is consisting of 12 bits

D. the CRC 12 dividing polynomial is consisting of 12 bits

E. the transmitted signal is the original data with the appended CRC.

The correct answer is B. To determine the CRC remainder, the data is not appended with 12 0's but rather with the CRC polynomial, then divided by the CRC dividing polynomial.

Given CRC 12 and implementing it as a dividing circuit, how many XOR logic gates (not the number of IC) are needed?

A. 13 (correct answer)
B. 5
C.12
D.12

The correct answer is A. 13 XOR logic gates are needed to implement the CRC 12 dividing circuit.

In a CRC dividing circuit what is the purpose of the shift register?

A.it serves as the input (wrong answer)
B.none of the choices
C.its is used for synchronization
D.as a storage device
E.to power up the circuit

The correct answer is D. The shift register is used as a storage device in a CRC dividing circuit.

Which M-ary encoding technique uses 4-bit input

A.QPSK (wrong answer)
B. BPSK
C. 16PSK
D. 8QAM

The correct answer is C. 16PSK is the M-ary encoding technique that uses a 4-bit input.

Given CRC 12 and implementing it as a dividing circuit the 1st XOR block in the circuit performs XOR between

A.the data input and the 1st shift register block (wrong answer)
B.the 1st and 2nd shift register block
C.the data input and the last shift register block
D.the first and the last shift register block

The correct answer is C. The first XOR block in the CRC dividing circuit performs XOR between the data input and the last shift register block.

In the CRC dividing circuit, synchronization is provided by

A. XOR
B. shift registers (wrong answer)
C. switches
D. 555 timer

The correct answer is B. Synchronization in the CRC dividing circuit is provided by using shift registers.

Which digital modulation technique is the baud rate not equal to its bit rate?

FSk
QPSK
BPSK
ASK (wrong answer)

The correct answer is A. FSK (Frequency Shift Keying) is the digital modulation technique where the baud rate is not equal to its bit rate.