The downlink port is connected to the optical splitter

Downlink board (also called service board or PON board), generally OLT equipment with multi-port PON board (such as a board with 8 PON ports), each port down through the splitter (no more than 1:64) c...

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To display the downlink, connect the B side of the splitter''s AB port to the RX SFP+ P1 port (SFP28 A1 port on 88260) of the module (generally marked with an in arrow).

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