40 66 00 Network and Communication Equipment
40 66 53 Multiple Address Radio Equipment
40 66 13Switches and Routers40 66 16Firewall Hardware40 66 19Media Converters40 66 23Frame Relay Equipment40 66 26Device Network Equipment40 66 33Metallic and Fiber-Optic Communication Cabling and Connectors40 66 36Process Instrumentation Networks40 66 43Wireless Network Systems40 66 53Multiple Address Radio Equipment40 66 56Point-to-Point Radio Equipment40 66 63Antennas40 66 66Monopoles and Towers40 66 73Satellite Communication Equipment