40GBASE-LR4 QSFP+ Optical Transceiver Module 4 Pack - 10km Reach

In this review the OPSTRAN 40GBASE-LR4 QSFP+ Optical Transceiver Module 4 Pack is assessed for network engineers and IT teams who need reliable 40G uplinks over single-mode fiber. The bottom line: this kit is for installations demanding a tested, hot-pluggable QSFP+ solution with DDM diagnostics and a confirmed EEPROM coding approach for compatibility. It stands out because it combines a low power envelope with built-in real time monitoring and a 10km reach, making it a practical option for data center aggregation or campus backbone links where predictable behavior and device-level testing matter.

Key Features

• 40GBASE-LR4 QSFP+: Provides a standardized 40 gigabit Ethernet link suitable for long-reach single-mode fiber up to 10km.
• Built-in high performance chip: Helps maintain stable signal integrity and supports the module's prolonged service life under normal commercial conditions.
• Low power consumption: At a maximum of 3.5W the module keeps heat and power budgets modest in dense QSFP+ deployments.
• Real Time Digital Optical Monitoring: Offers live diagnostics for power, temperature and signal levels to simplify troubleshooting.
• EEPROM compatibility lab: Modules are coded and tested for EEPROM requirements with major switch vendors to reduce interoperability surprises.
• Standards compliant: Hot pluggable SFF-8436 QSFP form factor compliant to IEEE 802.3ba and 40GBASE-LR4 standards for broad industry compatibility.

Who It's For

This product is aimed at network administrators, systems integrators and data center operators who need a reliable quad-channel 40G transceiver that is tested for compatibility with mainstream switches and routers. The 4 pack format is particularly useful for teams provisioning multiple aggregation or spine ports at once.

Those who require extended temperature range beyond commercial specifications or vendor-backed warranty programs tied to specific OEM parts may want to consider vendor-branded modules or industrial temperature rated alternatives instead.

Pros & Cons

Pros

• High interoperability due to targeted device testing and EEPROM coding efforts.
• Low maximum power consumption (3.5W) helps in dense QSFP+ deployments.
• Onboard DDM provides actionable diagnostics for quick fault isolation.
• Compliant QSFP+ form factor and IEEE 802.3ba standards ensure broad support.

Cons

• Commercial temperature range (0 to 70C) may be limiting for unstabilized outdoor or industrial sites.
• As a third-party module, buyers should verify compatibility with specific switch firmware where absolute OEM support is required.

Specifications

Form Factor	QSFP+
Standard	40GBASE-LR4, IEEE 802.3ba
Wavelength	1310nm (4 CWDM lanes)
Max Reach	10km on single-mode fiber
Max Power Consumption	3.5W
Temperature Range	Commercial 0 to 70C (32 to 158F)
Connector	Duplex LC

Our Verdict

The OPSTRAN 40GBASE-LR4 QSFP+ 4 Pack is a practical choice for data centers and enterprise networks needing tested, hot-pluggable 40G links with real time diagnostics and modest power use. It delivers strong value for teams provisioning multiple ports while avoiding the compatibility headaches often encountered with generic modules, but those requiring industrial temperature ratings or OEM warranty ties should consider alternatives.

Frequently Asked Questions

Are these modules hot pluggable?
Yes. The modules use the QSFP+ hot pluggable form factor compliant to SFF-8436.

Do they support monitoring of optical parameters?
Yes. Built-in Real Time Digital Optical Monitoring provides diagnostics for power, temperature and signal metrics.

What is the supported fiber type and maximum distance?
They are designed for single-mode fiber with duplex LC connections and a maximum reach of up to 10km.