Small Form-factor Pluggable Updated 2025-04-24 +Created 2024-06-28
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It's the thing that allows you to connect fiber optics into a compter, or the corresponding port for the thing.
Many of them can take two fibers as input/output because fiber optics cables often come in pairs because it is needed for duplex.
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Video 1.
How to choose SFP transceiver for fiber optical cable by FASTCABLING
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