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Consider a binary data sequence 1111101111. Draw the waveforms for the given binary data sequence, using Bipolar AMI RZ and Manchester.
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$$Binary \ Data \ Sequence - 1111101111$$

## Bipolar AMI

• It stands for Bipolar Alternate Mark Inversion (AMI).
• In this type of encoding, BIT – 0 is represented by 0 Voltage line, and BIT – 1 is represented by alternate Positive and Negative Voltages.

Waveform for the Binary Data Sequence 1111101111 using the Bipolar-AMI:

## Bipolar RZ

• In this type of encoding, transition always occurs in the middle of the bit interval.
• BIT – 0 is represented by a 0 Voltage line.
• BIT – 1 is represented by alternate Positive and Negative Voltages.
• But, transition always occurs in the middle of the bit interval.
• If the transition is at the POSITIVE Voltage Side, then it starts at the POSITIVE side, makes the transition, and returns to the 0 Voltage side. (Z - Shape Pattern)
• If the transition is at the NEGATIVE Voltage Side, then it starts at the NEGATIVE side, makes the transition, and returns to the 0 Voltage side. (Inverted Z - Shape Pattern)

Waveform for the Binary Data Sequence 1111101111 using the Bipolar RZ:

## Manchester

• Manchester combines the logic of RZ and NRZ-L encoding techniques.
• It is used by IEEE 802.5
• BIT - 0 represents the transition that starts at the POSITIVE side, makes the transition, and returns to the NEGATIVE side. (Z - Shape Pattern)
• BIT - 1 represents the transition that starts at the NEGATIVE side, makes the transition, and returns to the POSITIVE side. (Inverted Z - Shape Pattern)

Waveform for the Binary Data Sequence 1111101111 using the Manchester: