1st, from the data sheet: The Connection and Driving of Cascading Operation The transmit the data over long distance by cascading, the WS2801 integrates push-pull output stage with strong driving capability which enables the data and clock can be transmitted up to 6 meters at 2MHz clock frequency. To prevent the reflection, it is necessary to connect a 50Ω resistor at the data input or output port for impedance match. Now my questions: 1. On my pixel controller, does this mean I should have a 50 ohm resistor from data to ground and from clock to ground to match up when I connect to the controller strings. 2. If I am building my own strings, on each smart pixel, on my output, I should add a 50 ohm resistor on the clock and data lines to ground. Have I understood that correctly?