$$Binary\ Data\ Sequence - 10101010$$

Unipolar RZ

• Unipolar RZ stands for Unipolar Return to Zero.
• In this type of encoding, BIT– 0 is represented by a 0 Voltage line.
• BIT – 1 is represented by Positive Voltages.
• But, transition always occurs in the middle of the bit interval.
• That means transition that starts at the POSITIVE side, makes the transition, and returns to the 0 Voltage side. (Z - Shape Pattern)

Waveform for the Binary Data Sequence 10101010 using the Unipolar RZ:

Split Phase Manchester

• Split Phase Manchester is nothing but Manchester encoding.
• 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 10101010 using the Split Phase Manchester: