The Doug Fleenor Design 1211-TB is a professional-grade DMX512 isolated splitter and amplifier engineered for reliable signal distribution in complex lighting control systems. Featuring one DMX input and eleven electrically isolated outputs via terminal blocks, the unit ensures clean signal separation using 2,500-volt optical couplers and individual line drivers for each output. This design prevents signal degradation and interference, making it ideal for star-configured DMX networks across large venues. The 1211-TB supports feed-through connectivity and complies with EIA-485 standards, with input termination and robust construction housed in a powder-coated aluminum chassis. With no user adjustments required and printed DMX pinouts for easy setup, it’s a dependable solution for distributing DMX signals to dimmers, moving lights, and other fixtures in professional environments.