QSFPTEK 100GBASE-CWDM4 QSFP28 1310nm 2km Optical Transceiver

In this review the QSFPTEK 100GBASE-CWDM4 QSFP28 module is evaluated for networking professionals who need a cost-effective, compatible alternative to vendor-branded 100G optics. The bottom line: it delivers a straightforward way to run 100Gigabit Ethernet over single mode fiber for up to 2km while offering power efficiency and diagnostic monitoring. For anyone deploying high-density 100G links with devices expecting a Mellanox MMA1L30-CM style module, this review covers why the module is a practical choice and where its limitations lie.

Key Features

• 100G CWDM4 support: Enables 100Gigabit Ethernet over four CWDM lanes so you can aggregate four 25.78 Gb/s channels into a single QSFP28 port for high-capacity links.
• 2km single mode reach: Certified for up to 2km on single mode fiber with FEC, making it suitable for campus and data center interconnects within that distance.
• Integrated diagnostics: The I2C interface with Digital Diagnostic Monitoring provides real-time temperature, voltage and optical power data to assist with remote troubleshooting.
• Low power operation: Runs from a single +3.3V supply and consumes up to 3.5W, keeping heat and power budget modest in dense racks.
• Industry protocol compliance: Conforms to IEEE 802.3ba/802.3bm and QSFP28 MSA specifications, improving interoperability with compliant switches and routers.
• RoHS compliant and supported: Built to RoHS 6/6 standards and backed by a 30-day return window plus a 3-year warranty and lifetime tech support.

Who It's For

The module is best for network engineers, data center operators, and systems integrators who need a compatible 100G QSFP28 optical transceiver for equipment that accepts Mellanox-style modules. It is particularly useful when you want a lower-cost alternative while retaining features like digital diagnostics and a modest power footprint.

It is less suitable for long-haul links beyond 2km, or for environments that require extended industrial temperature ranges; organizations needing longer reach or harsh-environment optics should seek modules specifically rated for those conditions.

Pros & Cons

Pros

• Provides standard 100G CWDM4 performance for short to mid-range links up to 2km.
• Supports I2C-based digital diagnostic monitoring for proactive maintenance.
• Low maximum power consumption (3.5W) helps in high-density deployments.
• Complies with common IEEE and QSFP28 standards to aid interoperability.

Cons

• Reach is limited to 2km with FEC, so it is not a substitute for longer-reach or DWDM optics.
• Operating temperature is standard commercial range (0 to +70C), which may not suit extreme environments.

Specifications

Our Verdict

The QSFPTEK 100GBASE-CWDM4 QSFP28 module is a sensible, value-focused choice for data centers and network teams that require standard 100G CWDM4 connectivity to about 2km. It pairs low power draw and useful digital diagnostics with broad standards compliance, making it a practical replacement for vendor-branded optics in many deployments. Buy it if you need reliable 100G links within the specified reach and commercial temperature range.

Frequently Asked Questions

Is this module compatible with Mellanox MMA1L30-CM ports?
Yes, it is listed as compatible with Mellanox MMA1L30-CM style ports and other QSFP28 MSA-compliant hosts.

What is the maximum distance this transceiver can cover?
It supports up to 2km over single mode fiber when used with FEC.

Does it provide monitoring data?
Yes, the module supports an I2C interface with integrated Digital Diagnostic Monitoring for temperature, voltage and optical power.