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100G QSFP28

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100G QSFP28 Overview

The 100G QSFP28 category contains three optical transceiver modules for 100G Ethernet connectivity in data centers, high-performance computing networks, and enterprise core and distribution layers. All models use the QSFP28 form factor and support DOM monitoring. The series includes one multimode transceiver and two single-mode transceivers, covering transmission distances from 100m to 10km. Depending on the optical specification, the modules use either an MTP/MPO-12 UPC connector for short-reach SR4 transmission or a duplex LC/UPC connector for CWDM4 and LR4 links.

QSFP-100G-SR4 This 100GBASE-SR4 QSFP28 transceiver operates at 850nm over multimode fiber and uses an MTP/MPO-12 UPC connector. It supports transmission distances up to 100m and incorporates DOM monitoring. The module provides short-reach 100G Ethernet connections for data centers, high-performance computing networks, and enterprise core and distribution layer applications.

QSFP-100G-CWDM4 This 100GBASE-CWDM4 QSFP28 transceiver supports wavelength-division multiplexed transmission around 1310nm over single-mode fiber. It uses a duplex LC/UPC connector and reaches distances up to 2km. With integrated DOM monitoring, the module supports 100G Ethernet interconnections in data centers, high-performance computing networks, and enterprise core and distribution environments.

QSFP-100G-LR4 This 100GBASE-LR4 QSFP28 transceiver operates around 1310nm over single-mode fiber and uses a duplex LC/UPC connector. It supports transmission distances up to 10km and includes DOM monitoring. The module provides longer-reach 100G Ethernet connectivity for data centers, high-performance computing networks, and enterprise core and distribution layer applications.

FAQ

What are the main differences among the QSFP-100G-SR4, QSFP-100G-CWDM4, and QSFP-100G-LR4 modules in the 100G QSFP28 category?

They differ in fiber type, connector, and reach. QSFP-100G-SR4 supports 100m over multimode fiber with MTP/MPO-12 UPC, QSFP-100G-CWDM4 supports 2km over single-mode fiber with duplex LC/UPC, and QSFP-100G-LR4 extends single-mode links to 10km with duplex LC/UPC.

Which 100G QSFP28 model provides the longest transmission distance for enterprise core or data center interconnection links?

QSFP-100G-LR4. It supports transmission distances up to 10km over single-mode fiber and uses a duplex LC/UPC connector, providing the longest reach among the three listed 100G QSFP28 models.

Can QSFP-100G-SR4 be connected through a duplex LC single-mode fiber link?

No. QSFP-100G-SR4 is an 850nm multimode transceiver with an MTP/MPO-12 UPC connector. It is designed for parallel-fiber links up to 100m and does not use the duplex LC/UPC single-mode cabling required by the CWDM4 and LR4 models.

Why does QSFP-100G-CWDM4 use a duplex LC/UPC connector instead of the MTP/MPO-12 connector used by QSFP-100G-SR4?

It multiplexes four 25Gb/s optical wavelengths onto duplex single-mode fiber. One fiber carries transmitted traffic and the other carries received traffic, allowing QSFP-100G-CWDM4 to provide a 100G link through a duplex LC/UPC connection rather than parallel multimode fibers.

Does a host port using QSFP-100G-CWDM4 need forward error correction enabled for a CWDM4-compliant link?

Yes. The 100G CWDM4 MSA specifies host-side Clause 91 RS(528,514) FEC and does not support bypassing that correction function. The connected switch, server, or network adapter port should therefore be configured to provide the required FEC mode.

Can QSFP-100G-LR4 provide a 100G Ethernet connection over 10km of single-mode fiber?

Up to 10km. QSFP-100G-LR4 uses wavelength-division multiplexed transmission around 1310nm over single-mode fiber and provides a duplex LC/UPC interface for longer-reach 100G Ethernet connections.

Which modules in the 100G QSFP28 category support digital optical monitoring?

All three models. QSFP-100G-SR4, QSFP-100G-CWDM4, and QSFP-100G-LR4 include DOM support for monitoring operating information reported by the optical transceiver through a compatible host platform.

Can QSFP-100G-SR4, QSFP-100G-CWDM4, and QSFP-100G-LR4 be installed at opposite ends of the same optical link?

No. Both ends must use matching optical specifications. SR4, CWDM4, and LR4 differ in optical architecture, fiber medium, connector configuration, and supported reach, so an SR4 module cannot directly link with a CWDM4 or LR4 module, and CWDM4 should not be paired with LR4.

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