H!Fiber 4 Pack 1.25G Single Mode SFP LC Module - Reliable 20km Gigabit

In this review the H!Fiber 4 Pack 1.25G Single Mode SFP LC Module is evaluated for network admins and small IT teams who need reliable gigabit fiber links without vendor lock-in. The bottom line: these modules deliver stable 1.25 Gb/s single-mode connections with a 1310nm wavelength and up to 20km reach, making them a practical, cost-effective choice for connecting switches and routers from Cisco, Meraki, UniFi and other compatible brands. They are especially useful when a simple, hot-swappable transceiver with DDM monitoring is required.

Key Features

• 1.25 Gb/s data rate: Provides full gigabit throughput suitable for backbone links and uplinks between switches.
• 1310nm single-mode operation: Works over single-mode fiber (OS1/OS2/OS3) for long-distance connections up to 20km.
• Dual LC duplex interface: Uses standard LC/UPC connectors for easy integration into existing fiber runs and patch panels.
• Wide compatibility: Functions with a broad range of equipment including Cisco GLC-LH-SMD, Meraki, Ubiquiti, Mikrotik, Intel, Fortinet and others.
• DDM support: Digital diagnostic monitoring lets administrators check real-time link parameters like optical power and temperature.
• Low power design: Consumes under 1.05 watt for energy-efficient operation and reduced heat in dense switch environments.

Who It's For

The H!Fiber 4 Pack is aimed at IT professionals, small to medium business network owners, and integrators who need a dependable 1G single-mode SFP that is plug-and-play and compatible with many major networking brands. It is well suited for linking campus buildings, wiring closets, or extending uplinks between switches where 20km reach is sufficient.

Those who need multimode transceivers, 10G speeds, or vendor-specific locked modules should look elsewhere. Also, environments requiring specialized military or industrial ratings may need ruggedized modules beyond this product's standard specifications.

Pros & Cons

Pros

• Excellent cross-vendor compatibility reported by users, including successful use with Cisco Catalyst switches.
• Easy installation and hot-swappable convenience for quick replacements or upgrades.
• Useful DDM monitoring gives live feedback on link status and optical parameters.
• Low power consumption helps keep switch power and cooling requirements modest.

Cons

• Limited to 1.25 Gb/s speeds and single-mode fiber; not suitable for 10G or multimode deployments.
• Not intended for environments that need specially certified industrial or harsh-environment transceivers.

Specifications

Form factor	SFP (Small Form-Factor Pluggable)
Data rate	1.25 Gb/s
Wavelength	1310nm
Fiber type	Single-mode fiber (OS1/OS2/OS3)
Connector	Duplex LC (LC/UPC)
Maximum reach	Up to 20 km
Power consumption	< 1.05 watt

Our Verdict

The H!Fiber 4 Pack single-mode SFP modules are a sensible, value-minded choice for network teams needing reliable 1G fiber links and broad compatibility across brands. With hot-swappable convenience, DDM monitoring and low power draw, they deliver good performance for campus and closet uplinks while avoiding vendor lock-in, making them a practical purchase for most small to mid-size networks.

Frequently Asked Questions

Will these SFPs work in Cisco switches?
Yes, they are widely reported to function with Cisco devices such as Catalyst series that accept third-party 1G SFPs.

What is the maximum distance supported?
They operate over single-mode fiber up to 20 km (about 12.4 miles) at 1310nm.

Do they provide diagnostic monitoring?
Yes, the modules support DDM so you can monitor parameters like optical power and temperature in real time.