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Amazon.com: 40 Gigabit QSFP+ LC Single-Mode Transceiver, 40GBASE-LR4 Module for Arista QSFP-40G-LR4, 4 CWDM Lanes, DDM, 10km : Electronics
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StarTech.com HPE JG661A Compatible QSFP+ Module - 40GBASE-LR4 - 40GE Gigabit Ethernet QSFP+ 40GbE Single Mode Fiber Optic Transceiver 10km - HPE JG661A Compatible QSFP+ - 40GBASE-LR4 40Gbps - 40GbE Module -
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