Introduction: L-com Global Connectivity, established in Massachusetts, USA in 1982, is a professional manufacturer of various connectivity products. L-com products include: antennas, audio and video connections, coaxial D-Sub、 Fiber optic, FireWire DIN, SCSI, SATA, eSATA, Lightning arrester, Distribution frame and rack, Power over Ethernet (PoE), USB, Weather resistant junction box, Bandpass filter, Separators IEEE-488 GPIB、 Ethernet converters, serial converters/control cards, security monitoring equipment, Ethernet setup, non-standard products, system integration, communication and modularization, wireless network setup, and testing equipment. L-com products are widely used in industrial fields, including transportation, healthcare, education, energy, and IT industries; L-com official website: www.l-com. com.