TU-883 PCB The branch length in high-speed TTL circuits should be less than 1.5 inches. This topology takes up less wiring space and can be terminated with a single resistor match. However, this wiring structure makes the signal reception at different signal receiving ends asynchronous. The following is about 6mm Thick TU883 High speed Backplane related, I hope to help you better understand 6mm Thick TU-883 PCB.