ipolex QSA Adapter 100G QSFP28 to 25G SFP28 - Cost-Effective

In this review of the ipolex QSA Adapter 100G QSFP28 to 25G SFP28, the bottom line is simple: this adapter is for network engineers and IT teams who need a reliable, low-cost way to use SFP28 optics in a QSFP28 slot. The reviewer found that the adapter delivers stable signal conversion with low insertion loss and a solid metal housing, making it a practical choice when migrating ports or reusing existing SFP28 transceivers. It is plug and play and requires no configuration, which makes it useful in lab and production environments where minimizing downtime matters.

Key Features

• Versatile Compatibility: Works with QSFP28 MSA-compliant equipment from Dell, Juniper, Arista, Extreme and other vendors so it fits into mixed-brand racks.
• Comprehensive SFP28 Support: Accepts SFP28 optics and cables including SFP28-SR, SFP28-LR, passive copper and active optical cable types for flexible reach options.
• Cost-effective Conversion: Lets you run 25G optics from a 100G QSFP28 port, offering a practical migration path without replacing line cards or switches.
• Stable Performance: Low insertion loss, low crosstalk and low EMI emissions together with an all-metal housing provide dependable signal integrity.
• No Configuration Required: Plug-and-play operation means the adapter is ready to use out of the box, reducing deployment time.

Who It's For

The ipolex QSA Adapter suits network administrators who want to repurpose QSFP28 ports for 25G SFP28 transceivers during incremental upgrades or in lab testing, especially when working with Dell, Juniper, Arista or Extreme gear. It is also useful for small data centers that need cost-effective port flexibility without replacing switch modules.

It is not ideal for environments that require SFP DDM reading from the adapter itself, since this Version A reads DDM from the connected SFP transceiver and the adapter does not include an EEPROM. Users who need adapter-level DDM reporting or specialized firmware support should consider other products.

Pros & Cons

Pros

• Broad vendor compatibility simplifies deployment in mixed-brand networks.
• Supports the full range of SFP28 optic and cable types for flexible link distances.
• Durable metal housing and secure latching reduce physical failure risk in racks.
• Plug-and-play design keeps installation fast and straightforward.

Cons

• Version A lacks its own EEPROM, so it does not provide adapter-level DDM; DDM is read from the inserted SFP module.
• Not intended for non-MSA or proprietary QSFP implementations where compatibility is not guaranteed.

Specifications

Model	WADQS-28 (QSA-100A)
Conversion	QSFP28 to SFP28 (100G to 25G)
Supported Optics	SFP28-SR, SFP28-LR, passive copper, active optical cable
Operating Temp	-20C to +85C
Storage Temp	-40C to +125C
Supply Voltage	3.15 to 3.45V
Housing	All metal with secure latch

Our Verdict

The ipolex QSA Adapter 100G QSFP28 to 25G SFP28 is a practical, cost-effective tool for teams needing to reuse SFP28 optics in QSFP28 ports with minimal fuss. Its broad compatibility, stable electrical performance and plug-and-play convenience make it a good value for lab use and staged network upgrades, provided you accept that DDM is handled by the inserted SFP module rather than the adapter.

Frequently Asked Questions

Will this adapter work with my Dell or Juniper switch?
The adapter is designed for QSFP28 MSA-compliant ports and is widely compatible with Dell, Juniper, Arista, Extreme and similar equipment; check your switch supports standard QSFP28 modules.

Can the adapter read SFP DDM information?
Version A does not include an EEPROM; it relies on the connected SFP transceiver for DDM information rather than providing adapter-level DDM.

Is any configuration required?
No configuration is required; the adapter is plug and play and draws DDM data from the inserted SFP module when applicable.