The document is an installation and operation guide for the AJA RH10MD HD Downconverter and Re-clocking Distribution Amplifier card module. The RH10MD can downconvert HD video sources to SD formats while distributing the signal via 4 re-clocked HD-SDI or SDI outputs. It supports various HD and SD formats and can configure the 4 SD outputs individually as either SDI or analog signals. The guide provides an overview of the product's features and specifications.