An example method includes linking a transmit line and receive line to a respective via, and printing two paths to each via, wherein each path is interrupted by two pairs of contacts. When a first resistor is in a first pair of contacts at a receive via, first signal is formed between a receive point of a first connector and the receive line. When a first capacitor is in first pair of contacts at a transmit via, second signal is formed between transmit point of first connector and the transmit line. When a second resistor is in second pair of contacts at receive via, third signal is formed between receive point of a second connector and the receive line. When a second capacitor is in second pair of contacts at transmit via, fourth signal is formed between a transmit point of second connector and the transmit line.