100G QSFP28 PSM4 Optical Transceiver Module - 500m Single Mode

In this review the FiberMall QSFP28-100G-PSM4 module is assessed as a cost-conscious option for 100GBASE links in data centers and distribution cores. The bottom line: it is best for engineers who need a standards-compliant, hot-pluggable 100Gbps optics option with MTP/MPO termination and digital diagnostics. The reviewer found the module reliable for short single-mode distances up to 500m at 1310nm and appreciated the QSFP28 MSA and IEEE 802.3bm compatibility that makes integration straightforward across compliant gear.

Key Features

• 100Gbps aggregate: Four independent 25Gb/s channels provide full 100G throughput for high-density links in switches and servers.
• PSM4 single-mode design: Uses a 1310nm wavelength and MTP/MPO-12 connector to reach up to 500m over single mode fiber for campus and short metro links.
• Standards compliance: Fully compatible with QSFP28 MSA and IEEE 802.3bm 100GBASE-PSM4, easing interoperability with compliant Cisco-labeled and other vendor equipment.
• Hot pluggable with DDM: Hot-swap capability and digital diagnostics monitoring via I2C let technicians check link and optical status without downtime.
• Low power: Typical maximum power consumption around 3.5W helps limit heat in dense rack deployments.

Who It's For

The FiberMall QSFP28-100G-PSM4 is aimed at network engineers and operations teams who need a standards-based, lower-cost alternative for 100G links using MTP/MPO terminated single mode fiber. It is useful in data center spine and leaf deployments, high-performance computing environments, and enterprise core links where 500m reach is sufficient.

It is not for users who require extended single-mode distances beyond 500m or specialized vendor-proprietary optics. If you need multimode connectivity, different wavelengths, or vendor-locked modules with extended warranty terms, consider other optics designed for those specific needs.

Pros & Cons

Pros

• Standards-compliant QSFP28 module that interoperates with IEEE 802.3bm 100GBASE-PSM4 equipment.
• Supports digital diagnostics monitoring (DDM) for real-time status and easier troubleshooting.
• Hot pluggable and compact QSFP28 form factor for high-density 100G deployments.
• Low power consumption suitable for dense switch linecards and chassis.

Cons

• Designed for single mode 1310nm reach up to 500m, so it is not suitable for longer metro distances without an alternate transceiver.
• Compatibility depends on host support for MSA-compliant optics; some vendor platforms may require verification.

Specifications

Form factor	QSFP28
Protocol	100GBASE-PSM4 (IEEE 802.3bm)
Wavelength	1310nm
Reach	Up to 500m on single mode fiber (SMF)
Connector	MTP/MPO-12
Power consumption	Maximum ~3.5W
Diagnostics	Digital diagnostics (DDM) via I2C

Our Verdict

The FiberMall QSFP28-100G-PSM4 is a practical, standards-compliant 100G transceiver for teams that need reliable single-mode links up to 500m without vendor lock-in. It offers essential diagnostics, low power use, and QSFP28 interoperability at a value that makes it a sensible choice for data center and enterprise core upgrades where PSM4 is the required profile.

Frequently Asked Questions

Will this work in Cisco QSFP slots?
Yes, the module is designed to be compatible with QSFP-100G-PSM4-S and other equipment that accepts QSFP28 MSA-compliant transceivers, but always verify host firmware allows third-party optics.

What fiber connector is required?
It uses an MTP/MPO-12 connector for parallel single mode fiber links terminated for PSM4.

Does it provide monitoring data?
Yes, digital diagnostics monitoring (DDM) is available via the QSFP28 I2C interface for optical and electrical parameters.