U3020AY04 Remote Converter Test Port is a microwave/RF Test Port module that provides electrical to optical (E/O) and optical to electrical (O/E) signal conditioning to the U3020AY03 Local Converter that connects to a PNA-X Network Analyzer. The U3020AY04 optical ports allow the user to extend remote measurement capability to 1,000 meters (3,280 ft) from the network analyzer.