Viavi Solutions 5812P Fiber Optic Ethernet Network Tester is a dedicated instrument for validating Ethernet over fiber networks, with its roots in the JDSU T-BERD 5800 series. The 5812P designation identifies the model within Viavi’s lineage of fiber test equipment formerly known as JDSU T-BERD 5800. It is used to verify fiber‑optic Ethernet connections and assess link performance on optical networks.
