Summary
Highlights
Engineer Leo Ramos introduces a series of communication systems laboratories, focusing on different line encoding techniques such as Manchester, Bipolar, and Non-Return to Zero. The purpose of these techniques in signal transmission is discussed.
The necessary equipment for the laboratory is outlined, including a pre-calibrated digital oscilloscope, a DiLorenzo digital signal transmission module (DL3155M62), and an auxiliary module (DL3155M62A).
Instructions are provided on how to connect the DiLorenzo modules. The main module powers the auxiliary module, and the oscilloscope is connected using three probes for channel 1, channel 2, and external triggering, ensuring proper grounding.
The video details connecting the TX plug from the auxiliary module to the trainer and the TX data to the DiLorenzo input data. It further explains connecting the oscilloscope probe for external triggering to the trigger slot and channel one to the data output. Various line encoding outputs like RZ, NRZ, Manchester, Bi-phase, and Dual Binary are highlighted as potential connections for output observation.
The power is turned on, and the oscilloscope's auto-set feature is used. The Return to Zero waveform is displayed on Channel 2, with the data input on Channel 1. The auxiliary module's clock rate is set to 2400 Hz and word length to 15 bits for better visualization. The characteristics of the RZ waveform, where logic '1' returns to zero, are explained.
The oscilloscope probe is switched to the Non-Return to Zero output. The waveform for NRZ is demonstrated, showing that the output waveform largely copies the original input data with some delay.
The Manchester waveform is displayed, and its unique characteristics for transmitting digital data are shown. Following this, the Bi-phase waveform is presented, explaining how logic '0' and logic '1' are represented by different signal transitions.
The Dual Binary waveform is demonstrated, showcasing its multiple signal levels for different logic states. Finally, the DPSK (Differential Phase-Shift Keying) waveform is shown and briefly discussed.