400G QSFP Transceiver Types

400G QSFP transceivers are introduced respectively in the following table according to the two transmission types (over multimode fiber and single-mode fiber) they support.

Fiber Connections for 400G QSFP Transceivers

A QSFP-DD SR8 can interop with another QSFP-DD SR8 over an MTP-16/MPO-16 cable. This is the most popular connection using an MTP-16/MPO-16 cable to connect two QSFP-DD SR8 transceivers directly.

400G QSFP-DD SR8 breaks out to 2×200G SR4.

QSFP-DD SR8 interops with 8× 50G SR over MPO-16 to 8× LC duplex fiber cables.

QSFP 400G DR4

QSFP-DD DR4 interops with QSFP-DD DR4 over an MPO-12 trunk cable.

400G QSFP-DD DR4 interops with 4×100G DR over MPO-12 to 4× LC duplex breakout cable.

QSFP 400G XDR4/DR4+

400G QSFP-DD XDR4 interops with 4×100G FR modules over an MPO-12 to 4× Duplex LC cable.

QSFP-DD XDR4/DR4+ interops with QSFP-DD XDR4/DR4+ over an MPO-12 trunk cable.

QSFP 400G FR4

QSFP-DD FR4 interops with QSFP-DD FR4 over a duplex LC cable

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QSFP 400G 2FR4

QSFP-DD 2FR4 interops with 2×200G FR4 over 2× CS to 2× LC duplex cable.

QSFP 400G LR4

QSFP-DD LR4 interops with QSFP-DD LR4 over an LC duplex cable.

QSFP 400G LR8

QSFP-DD LR8 interops with QSFP-DD LR8 over an LC duplex cable. 

QSFP 400G ER8

QSFP-DD ER8 interops with QSFP-DD ER8 over an LC duplex cable.