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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

  • Port count1 - Fiber Optic LC Duplex Female
  • Product typeTransceiver
  • Supported standardsIEEE 802.3ba 40GBASE-LR4
  • Optical wavelength1270 nm to 1330 nm
  • Fiber modeSingle Mode
  • Maximum range10 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.

How it compares

Measured against everything we stock in SFP & SFP+ Transceiver Modules, at today’s prices. Recalculated every night.

Price $1,269.99
Pricier than about 90% of the 1,471 comparable items (median $138.99).

Specifications

Product
Brand nameStarTech.com
Model nameQSFP40GLR4S
Product typeTransceiver
Performance
Transfer speed40 Gbit/s
Connectivity
Supported standardsIEEE 802.3ba 40GBASE-LR4
Optical wavelength1270 nm to 1330 nm
Fiber modeSingle Mode
Maximum range10 km (6.2 mi)
Ports & slots
Port count1 - Fiber Optic LC Duplex Female
Size & build
Shipping weight0.45 kg
Package size117 × 92 × 34 mm
In the box
In the box1 - QSFP+ transceiver
Environment & compliance
Temperature rangeOperating 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)
Humidity range5 to 95% RH

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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