two multimode or single mode fibers fig7 a illustrates the duplex cable 8 in cross section detailing the multiple concentric layers including the polyvinyl chloride pvc cable jacket 14 aramid yarn 12 for pull strength and bend resistance tight buffer coating 16 and acrylate coated optical fiber 10 in addition the conductive surface of conductive wires 30 1 30 2 40 gauge or 75 micron diameter copper partially embedded in cable jacket are fully or at least partially exposed such cables 8 typically have cross sectional dimensions of 1 6 mm to 3 mm along the minor axis and 3 2 mm to 6 mm along the major axis the glass portion of the fiber optic cable 10 is typically 80 to 125 microns in diameter with an acrylate coating of 250 micron thickness surrounding each fiber optic element is a tight buffer coating or loose tube 16 which provides additional strength in an additional cable implementation the fiber optic jacket 14 can be printed or co extruded such that the concave channel includes a continuous line ribbon or fillet 30 1 comprised of conductive dye or polymer fig7 b for example dow corning pi 2000 conductive ink may be utilized this silver polymeric interconnect material exhibits a sheet resistance of 8 to 81 miliohms per square for 25 micron print thickness for comparison copper has a sheet resistivity of 0 68 miliohms square for a 25 micron thickness despite the larger resistance of these conductive compounds a 30 meter long cable with 1 mm wide trace 25 microns thick would have a resistance of 244 ohms total in many applications the tracer conductors are open circuited at one.