This solution brief provides a detailed method of implementation for measuring DisplayPort 2.1b source and sink return loss using Keysight vector network analyzers and Enhanced TDR software. It covers full-size DisplayPort, Mini DisplayPort, and USB-C DisplayPort Alt Mode configurations. The procedure includes equipment selection, DUT and fixture connections, AUX-channel control, state-file recall, differential 85-ohm conversion, electronic calibration, frequency setup, lane mapping, and result analysis. Supported VNA platforms include ENA, Streamline USB, PXI, and PNA instruments with 20 GHz or greater bandwidth. Unigraf control hardware configures the test pattern and bitrate, while ECal removes cable and fixture effects. The workflow improves repeatability and simplifies standards-based

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