Untuk bit stream 00110011001 gambarkan signal encodingnya jika memakai: Manchester Differential Manchester
Unlike with Manchester encoding, only the presence of a transition is important, not the polarity. Differential coding schemes will work exactly the same if the signal is inverted (wires swapped).
Differential Manchester
The digital encoding techniques are of two types--Polar and Bipolar. The polar encoding are--RZ(Return to Zero), NRZ (No RZ) , Manchester and Differential Manchester. Bipolar encoding are--AMI ( Alternate Mark Inversion) and BnZS ( Bipolar n Zero Substitution).
What is the baud rate of a digital signal that employs the differential Manchester scheme and has a data transfer rate of 2000 bps.
Differential Manchester
differential Manchester gives better noise immunity.
There is always a transition in the middle of an interval
2 times data rate
bit rate is half the baud rate
Some common optical line coding methods include Non-return-to-zero (NRZ), Return-to-zero (RZ), Manchester encoding, Differential Manchester encoding, and amplitude-shift keying (ASK). These methods are used in optical communication systems to convert digital data into optical signals for transmission over optical fibers.
Manchester encoding transmits different waveforms to distinguish between 0 and 1. For example, 1 is represented by a high voltage for the first half of the bit, followed by a low voltage (or a negative voltage) in the last half. A 0 should be the exact opposite: low voltage in the first half and high voltage in the second half. Wikipedia explains the principle of differential Manchester encoding better than I could: A '1' bit is indicated by making the first half of the signal equal to the last half of the previous bit's signal i.e. no transition at the start of the bit-time. A '0' bit is indicated by making the first half of the signal opposite to the last half of the previous bit's signal i.e. a zero bit is indicated by a transition at the beginning of the bit-time. In the middle of the bit-time there is always a transition, whether from high to low, or low to high. A reversed scheme is possible, and no advantage is given by using either scheme.