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5 pair 1Gb SC 5KM/20KM SFP Module Gigabit Optical Single Mode Single Fiber Transceiver Compatible with Cisco Ethernet Switch - AliExpress
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Amazon.com: StarTech.com Cisco GLC-LH-SMD Compatible SFP Module - 1000BASE-LH - 1GbE Single Mode Fiber SMF Optic Transceiver - 1GE Gigabit Ethernet SFP - LC 20km - 1310nm - DDM Cisco Firepower (SFPG1320C) :
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