This guide provides detailed information on fiber optic testing solutions specifically designed for hollow core fiber (HCF) networks. It outlines the capabilities of various testing platforms and modules, including the OneAdvisor 800 Platform and the 4100C OTDR, which offer advanced fiber characterization features such as bidirectional OLTS and OTDR, chromatic dispersion (CD), polarization mode dispersion (PMD), and attenuation profile (AP) measurements. The document explains the importance of accurate testing in ensuring the performance of HCF links, particularly in applications like data center interconnections and high-speed networks. It emphasizes the need for post-installation validation and presents the ReportPRO software for analyzing bidirectional loss profiles, which helps confirm compliance with specifications. The guide also highlights the unique advantages of VIAVI's testing solutions, including their ability to deliver accurate long-distance testing and the integration of advanced features that streamline the testing process for technicians.