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OEM SKU: DWDM-2.67G-SFP-40-59 

Multi-Vendor Compatible DWDM 2.67G SFP Module (Tx/Rx Ch. 59 (1530.33 nm)/17-61, ITU Grid: C-Band 100 Ghz, 100-2.67Gbps, Max. 40km over SMF, 13 dB, Temp. 0-70C, LC Connector)

OEM SKU: FTL4C1QE2C 

Finisar Compatible Double Fiber 40G QSFP+ Module (Tx/Rx 4 CWDM lines:1271,1291,1311,1331, up to 44.8 Gbps, Max. 10km over SMF, 9.7 dB, Temp. 0-70C, LC Connector)