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Small rectangular QSFP+ transceiver module with matte metal finish and LC duplex port

STARTECH

STARTECH QSFP40GLR4S 40GBASE-LR4 SFP transceiver 10 km

SKU CH-ZEBT-REZ3M MPN QSFP40GLR4S

40 Gbps single-mode transceiver reaches 10 km over LC duplex at 1270-1330 nm

  • Device TypeTransceiver
  • StandardsIEEE 802.3ba 40GBASE-LR4
  • Wavelength1270nm to 1330nm
  • Fiber CableSingle Mode
  • Ports1 - Fiber Optic LC Duplex Female
  • Max Distance10 km (6.2 mi)
  • Delivers 40 Gbps Ethernet over 10 km single-mode fibre
  • Cisco QSFP-40G-LR4-S equivalent ensures drop-in compatibility
  • Operates 0 °C to 70 °C with low 2.5 W power draw
  • Hot-swappable QSFP+ module meets MSA standards for easy upgrades
  • Digital diagnostics monitoring enables real-time link health visibility

40GBASE-LR4 QSFP+ Transceiver

The STARTECH QSFP40GLR4S is a 40 Gbps QSFP+ transceiver built for 40GBASE-LR4 networks. It uses single-mode fibre with LC duplex connectors to reach 10 km at wavelengths between 1270nm and 1330nm. The module is fully compliant with IEEE 802.3ba and MSA standards. It is guaranteed compatible with Cisco QSFP-40G-LR4-S equipment.

Suited for Long-Haul 40G Links

This transceiver suits data-centre and campus builds that need 40 Gbps over single-mode fibre up to 10 km. It is not for environments that require multimode cabling, shorter-reach optics, or higher-speed 100G interfaces. Buyers who need extended temperature ranges beyond 0 °C to 70 °C or power budgets above 2.5 W should look elsewhere.

Hot-Swappable QSFP+ Module

The unit plugs into any standard QSFP+ cage and draws less than 2.5 W, leaving headroom in dense chassis. Hot-swap support allows insertion or removal without powering down the switch. Digital diagnostic monitoring provides real-time link health data. Single-mode patch cords with LC duplex terminations complete the link.

Highlights

  • Delivers 40 Gbps Ethernet over 10 km single-mode fibre
  • Cisco QSFP-40G-LR4-S equivalent ensures drop-in compatibility
  • Operates 0 °C to 70 °C with low 2.5 W power draw
  • Hot-swappable QSFP+ module meets MSA standards for easy upgrades
  • Digital diagnostics monitoring enables real-time link health visibility

Specifications

BrandStarTech.com
ModelQSFP40GLR4S
Device TypeTransceiver
StandardsIEEE 802.3ba 40GBASE-LR4
Wavelength1270nm to 1330nm
Fiber CableSingle Mode
Ports1 - Fiber Optic LC Duplex Female
Max Distance10 km (6.2 mi)
Transfer Rate40 Gbps
TemperatureOperating Temperature: 0 degree C to 70 degree C (32 degree F to 158 degree F)
Storage Temperature: -40 degree C to 85 degree C (-40 degree F to 185 degree F)
Humidity5~95% RH
FeatureDelivers reliable 40 Gigabit Ethernet connections for 40GBase-LR4 compliant networks
100% Cisco compatible, equivalent to the Cisco QSFP-40G-LR4-S
Backed by lifetime warranty and free lifetime technical support
Meets or exceeds OEM specifications and MSA (Multi-Source Agreement) industry standards
Supports Digital Diagnostics Monitoring (DDM / DOM)
1270 nm to 1330 nm optical wavelength
Single-mode with maximum distance of up to 10 km (6.2 mi.) and LC fiber connector
Maximum data rates up to 40Gbps
Hot-pluggable, compatible with a 40 Gigabit Ethernet QSFP+ port
Package Contents1 - QSFP+ transceiver
Shipping weight0.45 kg
Package size117 × 92 × 34 mm

Questions about this item

What switch port type do I need to install this QSFP+ transceiver?

You need a free QSFP+ port that supports the IEEE 802.3ba 40GBASE-LR4 standard and accepts a single-mode LC duplex connector.

Can I run this module in the same chassis as older 10 Gbps SFP+ transceivers?

Yes, the hot-swappable QSFP+ module operates independently in its own port and draws under 2.5 W, so it will not affect adjacent 10 Gbps SFP+ optics.

How do I verify the link is healthy after I connect the single-mode fibre?

Check the switch port status for a 40 Gbps link-up and use the built-in DDM to confirm receive power is within the 1270 nm to 1330 nm operating window.

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