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10-1837-01 Cisco 1Gbps 1000Base-ZX Single-Mode Fiber 70km 155nm Duplex LC Connecor SFP Transceiver Module
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SFP-7040-31-IDD - 1000Base-LHX/LX, single-mode, 40Km, 1310nm SFP transceiver module, extreme temperature
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