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400G QSFP112

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400G QSFP112 Overview

The 400G QSFP112 category contains two 400G optical transceiver modules for supercomputing, computing, and storage interconnects. Both models use the QSFP112 form factor, PAM4 modulation, DOM support, and an MTP/MPO-12 APC optical connector. The series includes one multimode SR4 transceiver and one single-mode DR4 transceiver, covering distances from 50m to 500m. They support QSFP112/QDD switches, ConnectX-7 adapters, and BlueField-3 DPUs, including spine-leaf uplinks to 800G Ethernet switches and interconnections with 400G QSFP-DD or OSFP interfaces.

Q112-400G-SR4 This 400GBASE-SR4 QSFP112 transceiver operates at 850nm over multimode fiber and uses an MTP/MPO-12 APC connector for the SR4 optical interface. It supports transmission distances up to 50m with PAM4 modulation and DOM monitoring. The module connects QSFP112/QDD switches, ConnectX-7 adapters, and BlueField-3 DPUs in short-reach supercomputing and computing infrastructure. With a 1:2 breakout fiber cable, two channels are activated automatically to provide a 200G connection.

Q112-400G-DR4 This 400GBASE-DR4 QSFP112 transceiver provides 1310nm transmission over single-mode fiber through an MTP/MPO-12 APC connector. It supports links up to 500m and incorporates PAM4 modulation and DOM monitoring. The module supports QSFP112/QDD switches, ConnectX-7 adapters, and BlueField-3 DPUs, including uplinks to 800G Ethernet switches and connections with 400G QSFP-DD or OSFP interfaces. When paired with a 1:2 breakout fiber cable, two channels operate at an automatically reduced 200G rate.

FAQ

What is the main optical difference between Q112-400G-SR4 and Q112-400G-DR4 in the 400G QSFP112 category?

Q112-400G-SR4 uses 850nm multimode transmission for links up to 50m, while Q112-400G-DR4 uses 1310nm single-mode transmission for links up to 500m. Both use PAM4 modulation and an MTP/MPO-12 APC optical connector.

Which fiber and connector should be used with Q112-400G-SR4 for a short-reach 400G link?

Use multimode fiber with an MTP/MPO-12 APC connection. Q112-400G-SR4 operates at 850nm and supports transmission up to 50m for short-reach supercomputing, computing, and storage interconnects.

Can Q112-400G-DR4 support a 500m connection between computing, storage, or network devices?

Yes. Q112-400G-DR4 uses 1310nm parallel single-mode transmission and an MTP/MPO-12 APC connector to support links up to 500m, providing a longer reach than Q112-400G-SR4.

Can the 400G QSFP112 category connect ConnectX-7 adapters and BlueField-3 DPUs to compatible 400G switch ports?

Yes. The modules are intended for QSFP112 host ports on ConnectX-7 adapters and BlueField-3 DPUs and can link to compatible switch-side 400G optics. The switch optic must match the selected SR4 or DR4 interface and fiber type.

Can the 400G QSFP112 category form links to 400G QSFP-DD or OSFP interfaces and uplink toward 800G Ethernet switches?

Yes. A QSFP112 module can operate at one end while a matching 400G QSFP-DD or OSFP optic is used at the other. For an 800G switch, the switch-side port must provide a compatible 400G channel or breakout path using the same SR4 or DR4 optical interface.

What happens when Q112-400G-SR4 or Q112-400G-DR4 is connected through a supported 1:2 breakout fiber cable?

It operates as a 200G connection. The breakout cable activates two of the module’s four optical channels, and the transceiver automatically reduces from 400G to 200G when used in a compatible breakout configuration.

What diagnostic information can Q112-400G-SR4 and Q112-400G-DR4 provide through DOM?

Both support DOM for monitoring per-lane receive and transmit optical power, transmit bias current, supply voltage, and module temperature. Warning, alarm, and link-status information can also be accessed through a compatible host management interface.

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