100GBASE-ZR4 QSFP28 Optical Module - 80km LC DOM QSFPTEK

In this review the QSFPTEK 100GBASE-ZR4 module is examined for rack-to-rack and long-haul data center use where single-mode links up to 80km are required. The bottom line: this QSFP28 transceiver is aimed at network engineers and equipment integrators who need a hot-pluggable, low-power 100G module that supports dense single-mode links and online diagnostics. It delivers a practical blend of wide vendor compatibility, sensible power draw and diagnostic support that makes it straightforward to deploy in mixed-vendor environments.

Key Features

• Wide compatibility: Works with over 200 vendors, so it is easy to drop into multi-vendor racks without extensive firmware workarounds.
• High-speed channels: Four independent full-duplex lanes support up to 28Gb/s per channel for reliable 100G aggregate throughput.
• Long reach: Designed for 100GBASE-ZR4 operation up to 80km over single-mode fiber suitable for long-distance links in data centers or between sites.
• Low power operation: Single 3.3V supply and maximum power consumption of about 2.5W help keep module power and cooling requirements modest.
• Operational monitoring: DDM support provides access to critical optical and electrical diagnostics so potential issues can be found and addressed early.
• Hot-pluggable convenience: QSFP28 MSA compliance and plug-and-play operation make swaps and upgrades simple during maintenance windows.

Who It's For

This module is best for network engineers, data center operators, and integrators who need a dependable 100G single-mode transceiver for long-reach links such as between data halls or campus sites. Its wide vendor compatibility and DDM monitoring make it a practical choice when mixing brands or when remote diagnostics are required.

It is less appropriate for environments that need multimode fiber or short-reach optics, or for users who require unusually wide operating temperatures beyond 0 to 70C. Buyers who need vendor-certified firmware matching should confirm compatibility with their specific switch model before purchasing.

Pros & Cons

Pros

• Broad compatibility simplifies deployment across equipment from many vendors.
• Supports full 100G via four 28Gb/s channels for consistent high throughput.
• Long 80km SMF reach covers most inter-data-center and campus links.
• DDM support allows active monitoring of optical parameters to aid troubleshooting.

Cons

• Operating temperature is limited to 0 to 70C, so it may not suit extreme environments.
• Not suitable for short-range multimode links where separate optics are needed.

Specifications

Form Factor	QSFP28 (QSFPTEK)
Standard	100GBASE-ZR4, QSFP28 MSA, IEEE 802.3bm
Wavelength	1310nm
Maximum Reach	Up to 80km over single-mode fiber
Power Supply	Single 3.3V
Maximum Power	2.5W
Connector	LC Duplex

Our Verdict

The QSFPTEK 100GBASE-ZR4 module is a pragmatic choice for teams that need a cost-effective, wide-compatible 100G single-mode transceiver for long-distance links. Its low power draw, DDM diagnostics and MSA compliance make it good value for data centers and cross-site connections, provided the operating temperature range and single-mode reach match the deployment requirements.

Frequently Asked Questions

Will this module work with my switch?
It is designed to be compatible with more than 200 vendors, but you should verify compatibility with your specific switch model or consult support if your brand is not listed.

What fiber type does it require?
This transceiver is intended for single-mode fiber (SMF) links and supports up to 80km; it is not for multimode fiber use.

Does it provide diagnostics?
Yes, the module supports DDM so you can monitor optical power, temperature and other critical parameters for troubleshooting.