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Rectangular metal QSFP+ transceiver with LC duplex port, silver finish

STARTECH

STARTECH QSFP40LR4ST 40GBASE-LR4 SFP transceiver

SKU CH-4CDC-PFNYB MPN QSFP40LR4ST

Delivers 40 GbE over single-mode fiber up to 10 km using LC duplex connectors and 1270–1330 nm wavelengths

  • Port count1 - Fiber Optic LC Duplex Female
  • Product typeTransceiver
  • Supported standardsIEEE 802.3ba 40GBASE-LR4
  • Optical wavelength1270 nm to 1330 nm
  • Fiber modeSingle-mode Optical Fiber
  • Maximum range10 km (6.2 mi)
  • Delivers dependable 40GbE connectivity over 10 km single-mode fiber
  • MSA uncoded design works with switches from Ubiquiti, D-Link, Netgear and more
  • Hot-swappable module supports Digital Diagnostic Monitoring for SNMP management tools
  • Operates reliably from 0 °C to 70 °C in 5 % to 95 % humidity
  • Compliant with IEEE 802.3ba 40GBASE-LR4 standard at 1270 nm to 1330 nm wavelengths

40GBASE-LR4 QSFP+ Transceiver

This MSA uncoded QSFP+ module provides a 40GbE single-mode fiber link for enterprise and campus networks. It targets administrators who need standards-compliant 40G connectivity over long distances without vendor lock-in.

Hot-swappable LC duplex integration

The transceiver plugs into any MSA-compliant QSFP+ port and accepts a standard LC duplex patch cord, freeing a switch slot for a 10 km single-mode run. No additional cabling adapters or proprietary coding are required.

0–70 °C operation with DDM

Digital Diagnostic Monitoring reports temperature, voltage and optical levels to SNMP tools while the module runs passively within the 0 to 70 °C operating range. Storage tolerance spans -40 to 85 °C and 5 to 95 % humidity.

How it compares

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

Price $1,263.99
Pricier than about 90% of the 1,471 comparable items (median $138.99).

Specifications

Product
Brand nameStarTech.com
Model nameQSFP40LR4ST
Product typeTransceiver
Connectivity
Supported standardsIEEE 802.3ba 40GBASE-LR4
Optical wavelength1270 nm to 1330 nm
Fiber modeSingle-mode Optical Fiber
Maximum range10 km (6.2 mi)
Ports & slots
Port count1 - Fiber Optic LC Duplex Female
Size & build
Shipping weight0.45 kg
Package size127 × 102 × 51 mm
In the box
In the box1 x QSFP+ transceiver
Environment & compliance
Temperature rangeOperating Temperature: 0 to 70 degree Celsius (32 to 158 degree Fahrenheit)
Storage Temperature: -40 to 85 degree Celsius (-40 to 185 degree Fahrenheit)
Humidity range5 to 95% RH

Questions about this item

What distance can the 40GBASE-LR4 link reach over single-mode fiber?

The transceiver supports single-mode fiber links up to 10 km (6.2 mi) at 40 Gbps using LC duplex connectors.

How much heat does the module generate when running continuously at 40 Gbps?

It is rated for continuous operation from 0 °C to 70 °C (32 °F to 158 °F) with 5 % to 95 % RH, so standard rack airflow keeps it within limits.

Which switches will accept this uncoded QSFP+ module without vendor lock-in?

It works with any MSA-compliant switch or router — including models from Ubiquiti, D-Link, Netgear, Supermicro and TP-Link — that accepts uncoded QSFP+ optics.

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