PHYSICAL LAYER AND TRANSMISSION MEDIA
DIGITAL TRANSMISSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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B8ZS
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HDB3
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8B/10B
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All of the above
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Detailed explanation-1: -Bipolar with 8-zero substitution (B8ZS) is commonly used in North America. In this technique, eight consecutive zero-level voltages are replaced by the sequence 000VB0VB.
Detailed explanation-2: -HDB3 Scrambling Technique: In this technique, which is more conservative than B8ZS, four consecutive zero-level voltages are replaced with a sequence of OOOV or BOOV. The reason for two different substitutions is to maintain the even number of nonzero pulses after each substitution.
Detailed explanation-3: -Scrambling is a binary bit-level processing applied to the transmission rate signal in order to make the resulting binary sequence appear more random.
Detailed explanation-4: -NRZ-L and NRZ-I both have an average i l t f N/2 Bd signal rate of N/2 Bd.