400GBASE-FR4 Explained: Specs, Architecture, and Uses
LINK-PP Official Store
·
March 10, 2026
Learn what 400GBASE-FR4 is, how it works, its CWDM4 wavelength design, specs, transmission distance, and how it compares with other 400G optical standards.
How to Choose QSFP Modules: 40G, 100G & QSFP-DD Guide
LINK-PP Official Store
·
December 22, 2025
Learn how to choose QSFP modules for 40G, 100G, QSFP28, QSFP56, and 400G QSFP‑DD networks. Compare speed, distance, fiber type, compatibility, and LINK‑PP products.
400G-QSFP Products
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NVIDIA/Mellanox QDD-SR4.2-400G Compatible LINK-PP 400GBASE-SR4.2 QSFP-DD BiDi 850/910nm 150m MPO-12/UPC MMF Transceiver Module $ 1,210.00 ~ 1,375.004.8 ★ 13 Reviews | 161 Sold -
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Juniper QDD-400G-SR4P2 Compatible LINK-PP 400GBASE-SR4.2 QSFP-DD BiDi 850/910nm 150m MPO-12/UPC MMF Transceiver Module $ 1,210.00 ~ 1,375.005 ★ 15 Reviews | 128 Sold -
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Generic QDD-SR4.2-400G Compatible LINK-PP 400GBASE-SR4.2 QSFP-DD BiDi 850/910nm 150m MPO-12/UPC MMF Transceiver Module $ 1,210.00 ~ 1,375.004.8 ★ 12 Reviews | 130 Sold -
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FS QDD-SR4.2-400G Compatible LINK-PP 400GBASE-SR4.2 QSFP-DD BiDi 850/910nm 150m MPO-12/UPC MMF Transceiver Module $ 1,210.00 ~ 1,375.004.9 ★ 11 Reviews | 167 Sold -
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Dell QDD-SR4.2-400G Compatible LINK-PP 400GBASE-SR4.2 QSFP-DD BiDi 850/910nm 150m MPO-12/UPC MMF Transceiver Module $ 1,210.00 ~ 1,375.004.9 ★ 13 Reviews | 159 Sold -
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Cisco QDD-400G-SR4.2-BD Compatible LINK-PP 400GBASE-SR4.2 QSFP-DD BiDi 850/910nm 150m MPO-12/UPC MMF Transceiver Module $ 1,210.00 ~ 1,375.005 ★ 15 Reviews | 119 Sold -
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Arista QDD-400G-SRBD Compatible LINK-PP 400GBASE-SR4.2 QSFP-DD BiDi 850/910nm 150m MPO-12/UPC MMF Transceiver Module $ 1,210.00 ~ 1,375.004.9 ★ 14 Reviews | 135 Sold -
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Cisco QDD-400G-LR4-S Compatible 400GBASE-LR4 QSFP-DD 1310nm 10km DOM Duplex LC SMF Optical Transceiver Module $ 738.74 ~ 859.005 ★ 24 Reviews | 897 Sold -
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LINK-PP LQD-CW400-LR4C 400GBASE-LR4 QSFP-DD 1310nm 10km DOM Duplex LC SMF Optical Transceiver Module $ 738.74 ~ 859.005 ★ 47 Reviews | 990 Sold -
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NVIDIA/Mellanox QDD-XDR4-400G Compatible LINK-PP 400GBASE-XDR4 QSFP-DD 8 x 50G PAM4 1310nm 2km MPO-12/APC SMF Transceiver Module $ 755.92 ~ 859.004.9 ★ 18 Reviews | 881 Sold
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