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40G QSFP+

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40G QSFP+ Overview

The 40G QSFP+ category contains two optical transceiver modules for 40G Ethernet interconnections across campus networks, data centers, cloud deployments, and high-performance computing environments. Both models use the QSFP+ form factor and support DOM monitoring. The series includes one multimode SR4 transceiver and one single-mode LR4 transceiver, covering transmission distances from 150m to 10km. Depending on the optical specification, the modules use either an MTP/MPO-12 UPC connector for short-reach parallel optical links or a duplex LC/UPC connector for long-reach connections between switches, routers, servers, and transmission equipment.

QSFP-40G-SR4 This 40GBASE-SR4 QSFP+ transceiver operates at 850nm over multimode fiber. Its SR4 parallel optical interface uses an MTP/MPO-12 UPC connector and supports transmission distances up to 150m. The module incorporates DOM monitoring and provides short-reach 40G Ethernet connections between switches, routers, servers, and transmission equipment in campus networks, data centers, cloud deployments, and high-performance computing environments.

QSFP-40G-LR4 This 40GBASE-LR4 QSFP+ transceiver provides 1310nm transmission over single-mode fiber through a duplex LC/UPC connector. It supports optical links up to 10km and integrates DOM monitoring. The module is designed for long-reach 40G Ethernet interconnections between switches, routers, servers, and transmission equipment across campus networks, data centers, cloud deployments, and high-performance computing environments.

FAQ

What are the main optical and cabling differences between the QSFP-40G-SR4 and QSFP-40G-LR4 transceivers?

QSFP-40G-SR4 uses 850nm parallel optics, multimode fiber, and an MTP/MPO-12 UPC connector for links up to 150m. QSFP-40G-LR4 uses 1310nm wavelength-multiplexed optics, single-mode fiber, and a duplex LC/UPC connector for links up to 10km.

Which multimode fiber and connector should be used to obtain the full 150m reach with QSFP-40G-SR4?

Use OM4 multimode fiber with an MTP/MPO-12 UPC connection. Under 40GBASE-SR4 specifications, OM4 supports links up to 150m, while OM3 is generally limited to 100m.

Can QSFP-40G-SR4 provide four separate 10GbE links from one compatible 40G QSFP+ port?

Yes. QSFP-40G-SR4 uses four parallel optical lanes and can support 4x10GbE breakout when the host port supports channelization and an appropriate MTP/MPO-12-to-four-duplex-LC breakout cable or cassette is used.

Why does QSFP-40G-LR4 use a duplex LC/UPC connection rather than the MTP/MPO-12 interface used by QSFP-40G-SR4?

Because QSFP-40G-LR4 multiplexes four 10Gb/s optical lanes onto four wavelengths inside the transceiver. The combined 40GbE signal is transmitted over one single-mode fiber pair, allowing the module to use a duplex LC/UPC connector.

Can QSFP-40G-LR4 be split into four independent 10GbE optical links with a passive duplex LC breakout cable?

No. Its four optical lanes are wavelength-multiplexed onto the same duplex single-mode fiber pair rather than carried over four separate transmit fibers. A passive duplex LC breakout cable therefore cannot produce four independent 10GbE links.

Can QSFP-40G-SR4 and QSFP-40G-LR4 establish a direct optical link when installed at opposite ends?

No. QSFP-40G-SR4 uses an 850nm parallel multimode interface with MTP/MPO-12, while QSFP-40G-LR4 uses a 1310nm wavelength-multiplexed single-mode interface with duplex LC. Their optical interfaces, fiber types, and connectors do not match.

Do both QSFP-40G-SR4 and QSFP-40G-LR4 support digital optical monitoring during 40GbE operation?

Yes. Both listed models include DOM support, enabling connected host equipment to access module operating and diagnostic information while the optical link is in service.

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