Symbol for reactance. i = inductance or capacitance.
One of the first packet-switched WAN technologies. Now thought too slow for interconnecting LANs. However, because of its large entrenched base, X.25 will continue to be an important wide area communications protocol for many years.
See Membrane Switch X-Y Matrix.
Two FXT wires twisted together or run parallel, color coded, 125 in, 60º C, 18-20 AWG.