The most secure method is to check the VIAVI Solutions Discontinued Products page for manuals and potential software archives.
Since official support is limited, many technicians rely on community-maintained repositories. A notable archive includes firmware and Plan-Um software hosted on GitHub or Archive.org. Key Features of Plan-Um® Software
The Plan-Um software is the backbone of the NT900's reporting capabilities.
Historically, users were required to register at www.jdsu.com/validator to access firmware and Plan-Um software updates.
