An analog Ethernet detector determines if an IEEE 1394b long haul application using Category 5 cable, is connected to an Ethernet which share certain pins of the RJ45 connector used to connect devices to the CAT 5 cable. A first flow path is in fluid communication with the piston-cylinder arrangement and a second flow path is in fluid communication with the piston-cylinder arrangement. The surface plasmon resonance layer is configured to concentrate an applied plasmon field to a bottom portion of the cavity. In general, signals from multiple slices created by selective RF excitation are read-out on a read gradient. A relevant multi-party communication security system and a device are further provided in the present invention. The welding apparatus includes a heat source for producing a heat input zone on the workpiece surface, a supplying device for supplying welding filler into the heat input zone and a transporting device for producing a relative movement between the heat source and the supplying device on the one hand and the workpiece surface on the other hand.