Before revision: However, if the propagation delay in a wire, PCB trace, cable, or connector is greater than 1/6 of the rise time of the digital signal , the "lumped" circuit model is no longer valid and the interconnect has to be analyzed as a transmission line.
After revision: significant (for example, if the delay is)However, if the propagation delay in a wire, PCB trace, cable, or connector is greater than 1/6 of the rise time of the digital signal , the "lumped" circuit model is no longer valid and the interconnect has to be analyzed as a transmission line.