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Compact QSFP+ transceiver module with matte metal housing and LC duplex port

STARTECH

STARTECH QSFP40GSR4ST 40GBASE-SR4 SFP transceiver

SKU CH-ET8C-2S40W MPN QSFP40GSR4ST

Provides 40 Gbps multimode fibre connectivity up to 150 m over LC duplex with 850 nm wavelength and low power draw

  • Port count1 - Fiber Optic LC Duplex Female
  • Product typeTransceiver
  • Supported standardsIEEE 802.3ba 40GBASE-SR4
  • Optical wavelength850 nm
  • Fiber modeMulti Mode
  • Maximum range150 m (492 ft)
  • Delivers 40 Gbps over multimode fibre using IEEE 802.3ba 40GBASE-SR4 standard
  • Guaranteed 100% compatible with Cisco QSFP-40G-SR4 equipment
  • Reaches 150 m (492 ft) on OM3/OM4 multimode cable
  • Hot-swappable QSFP+ module with DDM for live network changes
  • Low power draw under .7 W reduces rack energy costs

Compatibility & Use

This transceiver is built for data-centre and enterprise networks that run 40GBASE-SR4 over multimode fibre. It plugs into any QSFP+ port that accepts the IEEE 802.3ba standard and is guaranteed to work with Cisco QSFP-40G-SR4 equipment. The module ships ready to install with an LC duplex connector.

Who should consider another option

Networks that require single-mode fibre, longer reach than 150 m, or a different wavelength will need a separate module. Environments outside the 0 °C to 70 °C operating range or those that demand a non-Cisco coded transceiver should look elsewhere. The part does not support speeds other than 40 Gbps.

Distance & power

The 850 nm VCSEL array delivers a maximum link distance of 150 m (492 ft) on OM3/OM4 multimode fibre while drawing less than 0.7 W. Digital diagnostic monitoring is included for real-time link health checks.

How it compares

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

Price $579.99
Pricier than about 86% of the 1,471 comparable items (median $138.99).

Specifications

Product
Brand nameStarTech.com
Model nameQSFP40GSR4ST
Product typeTransceiver
Performance
Transfer speed40 Gbit/s
Connectivity
Supported standardsIEEE 802.3ba 40GBASE-SR4
Optical wavelength850 nm
Fiber modeMulti Mode
Maximum range150 m (492 ft)
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 LC duplex patch cord and multimode fibre type does this QSFP+ transceiver require for a 40GBASE-SR4 link?

Use OM3 or OM4 multimode fibre with LC duplex connectors; the module operates at 850nm and reaches 150m (492 ft) on compliant cable.

How is the module inserted into a Cisco switch and which step is commonly missed?

Slide the QSFP+ unit straight into the cage until the latch clicks; the step often missed is removing the dust caps from both the transceiver and the patch cord before insertion.

What ongoing checks does the transceiver need and when should it be replaced?

Monitor DDM readings for temperature (0–70 °C / 32–158 °F), voltage and optical power; replace the module if alarms persist or link errors increase despite clean connectors.

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