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400G OSFP & QSFP112 InfiniBand NDR

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400G OSFP & QSFP112 InfiniBand NDR Overview

The 400G OSFP & QSFP112 InfiniBand NDR category contains five PAM4 optical transceiver modules for 400Gb/s links in InfiniBand NDR networks using Mellanox ConnectX®-7 InfiniBand/VPI adapter cards in AI servers. The series includes three OSFP Flat Top modules and two QSFP112 modules, all supporting DOM and MTP/MPO-12 APC connectivity. Two models operate over multimode fiber, while three use single-mode fiber. Covering SR4 and DR4 transmission, these transceivers support four 100Gb/s optical channels and transmission distances from 50m to 500m.

OSFP-NDR-SR4 is a 400GBASE-SR4 OSFP Flat Top transceiver for four-channel parallel transmission over multimode fiber. It uses PAM4 modulation at 850nm, with each optical channel carrying 100Gb/s for an aggregate rate of 400Gb/s. A single MTP/MPO-12 APC connector carries the four optical channels and supports links up to 50m. The module includes DOM and is designed for InfiniBand NDR connections through Mellanox ConnectX®-7 InfiniBand/VPI adapter cards.

OSFP-NDR-DRL4 is a 400GBASE-DR4 OSFP Flat Top module for short-reach single-mode links. Its four parallel optical channels operate at 1310nm and carry 100Gb/s each, providing a total transmission rate of 400Gb/s. The module uses one MTP/MPO-12 APC connector for the four-channel optical interface and supports distances up to 100m. PAM4 modulation and DOM are included for InfiniBand NDR links using Mellanox ConnectX®-7 InfiniBand/VPI adapter cards.

OSFP-NDR-DR4 supports 400GBASE-DR4 transmission over single-mode fiber in an OSFP Flat Top form factor. It uses four parallel 1310nm optical channels, each transmitting at 100Gb/s, to deliver an aggregate 400Gb/s link. The four channels are carried through one MTP/MPO-12 APC connector, with a maximum transmission distance of 500m. The module supports PAM4 modulation and DOM for InfiniBand NDR connections with Mellanox ConnectX®-7 InfiniBand/VPI adapter cards.

Q112-NDR-SR4 is a QSFP112 400GBASE-SR4 transceiver designed for 50m multimode fiber links. It operates at 850nm using four parallel optical channels, with each channel carrying 100Gb/s through a single MTP/MPO-12 APC connector. The combined optical rate is 400Gb/s. PAM4 modulation and DOM support are integrated for InfiniBand NDR connectivity through Mellanox ConnectX®-7 InfiniBand/VPI adapter cards installed in AI servers.

Q112-NDR-DR4 is a QSFP112 400GBASE-DR4 transceiver for parallel single-mode transmission at 1310nm. Four 100Gb/s optical channels provide a total rate of 400Gb/s and are routed through one MTP/MPO-12 APC connector. The module supports transmission distances up to 500m, along with PAM4 modulation and DOM. It is used for InfiniBand NDR links based on Mellanox ConnectX®-7 InfiniBand/VPI adapter cards.

What is the practical difference between OSFP-NDR-SR4 and Q112-NDR-SR4 when both are used for 400Gb/s InfiniBand NDR links?

The host form factor is different. OSFP-NDR-SR4 uses a flat-top OSFP shell, while Q112-NDR-SR4 uses QSFP112. Both provide 400G SR4 transmission over multimode fiber at 850nm, with four 100Gb/s PAM4 channels, one MTP/MPO-12 APC connector, DOM, and up to 50m reach.

How do OSFP-NDR-DRL4 and OSFP-NDR-DR4 differ when planning single-mode InfiniBand NDR cabling?

The supported reach is different. OSFP-NDR-DRL4 supports up to 100m, while OSFP-NDR-DR4 supports up to 500m. Both use 1310nm single-mode transmission, four 100Gb/s PAM4 optical channels, one MTP/MPO-12 APC connector, and DOM.

Which models in the 400G OSFP & QSFP112 InfiniBand NDR category require multimode fiber, and which require single-mode fiber?

OSFP-NDR-SR4 and Q112-NDR-SR4 require multimode fiber. OSFP-NDR-DRL4, OSFP-NDR-DR4, and Q112-NDR-DR4 require single-mode fiber. The SR4 models operate at 850nm, while the DR4 models operate at 1310nm.

Which models in the 400G OSFP & QSFP112 InfiniBand NDR category provide the longest transmission distance?

OSFP-NDR-DR4 and Q112-NDR-DR4 provide the longest reach, supporting up to 500m over single-mode fiber. Both use 1310nm DR4 parallel optics, four 100Gb/s PAM4 channels, and one MTP/MPO-12 APC connector.

Can every module in the 400G OSFP & QSFP112 InfiniBand NDR category be installed in any Mellanox ConnectX®-7 adapter card?

No. The transceiver form factor must match the ConnectX®-7 port. OSFP-NDR-SR4, OSFP-NDR-DRL4, and OSFP-NDR-DR4 require an OSFP cage, while Q112-NDR-SR4 and Q112-NDR-DR4 require a QSFP112 cage. NVIDIA documents ConnectX®-7 variants with either flat-top OSFP or QSFP112 interfaces.

Can OSFP-NDR-DR4 and Q112-NDR-DR4 be used at opposite ends of the same 400Gb/s optical link?

Yes. Their optical specifications match: both use 400G DR4, 1310nm single-mode transmission, four 100Gb/s PAM4 channels, one MTP/MPO-12 APC connector, and up to 500m reach. Each endpoint must provide the correct host cage for its module form factor.

What multimode fiber is needed for OSFP-NDR-SR4 and Q112-NDR-SR4 to reach the specified 50m distance?

OM4 multimode fiber is required for the specified 50m reach. Matching 400G SR4 implementations support up to 30m on OM3 and up to 50m on OM4, using 850nm optics and one MTP/MPO-12 APC connector.

Do any modules in the 400G OSFP & QSFP112 InfiniBand NDR category use a duplex LC optical connector?

No. All five models use one MTP/MPO-12 APC connector for four-channel parallel optics. None of the listed OSFP or QSFP112 models uses duplex LC connectivity.

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