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What is an SFP (Small Form Factor Pluggable) Port?
Amazon.com: Gigabit Fiber Media Converter Single-Mode LC (SFP LX Transceiver Included), up to 20KM, 10/100/1000Base-Tx to 1000Base-LX : Electronics
Gigabit SFP to Ethernet Media Converter with with a SFP 1000Base-LX Module (1310nm, up to 20km) Singlemode Dual LC Fiber, SFP to RJ45 switches - Newegg.com