40 66 00 Network and Communication Equipment
40 66 56 Point-to-Point 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