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Small rectangular QSFP+ transceiver module with MPO port, matte metal finish

Cisco Systems, Inc.

Cisco Systems, Inc. QSFP-40G-SR4-S= 40GBASE-SR4 SFP transceiver

SKU CH-1FH7-5TDPB MPN QSFP-40G-SR4-S=

Hot-swappable QSFP+ transceiver delivers 40 Gigabit Ethernet over multi-mode fibre up to 492 ft. at 850 nm

  • Device TypeTransceiver
  • StandardsFCC CFR21 Part 1040, GR-326-CORE, GR-20-CORE, GR-1435-CORE,
  • Wavelength840-860 nm
  • Ports1 x Ethernet 40GBASE-SR4 - MTP / MPO multi-mode
  • Max Distance492 ft.
  • Power Adapter1.5 Watts
  • Hot-swappable QSFP module installs without network downtime
  • 40 Gbit/s over multimode fibre up to 492 ft
  • Compliant with IEEE 802.3ba and multiple MSA standards
  • Tested on Cisco 40G ports for reliable interoperability
  • Low 1.5 W power draw reduces chassis thermal load

40GBASE-SR4 QSFP+ transceiver

This Cisco QSFP-40G-SR4-S= module delivers 40 Gigabit Ethernet over multi-mode fibre using an 850 nm wavelength and MTP/MPO connector. It is a hot-swappable transceiver designed for Cisco QSFP ports and certified to IEEE 802.3ba.

Suits links up to 492 ft on OM3/OM4 fibre.

The module operates at 840-860 nm and reaches 492 ft on multi-mode fibre, making it appropriate for short-range data-centre interconnects. It will not function on single-mode cable plants or distances beyond the specified multi-mode reach.

Maximum reach of 492 ft on multi-mode fibre

The 492 ft distance limit at 850 nm is the key parameter that determines whether this transceiver matches the link budget. Verify the patch length and fibre grade before deployment.

Highlights

  • Hot-swappable QSFP module installs without network downtime
  • 40 Gbit/s over multimode fibre up to 492 ft
  • Compliant with IEEE 802.3ba and multiple MSA standards
  • Tested on Cisco 40G ports for reliable interoperability
  • Low 1.5 W power draw reduces chassis thermal load

Specifications

BrandCISCO
ModelQSFP-40G-SR4-S=
Device TypeTransceiver
StandardsFCC CFR21 Part 1040, GR-326-CORE, GR-20-CORE, GR-1435-CORE, MSA SFF-8431, MSA SFF-8436, IEC 60825-1 Class 1
Wavelength840-860 nm
Ports1 x Ethernet 40GBASE-SR4 - MTP / MPO multi-mode
Max Distance492 ft.
Power Adapter1.5 Watts
Temperature32 ~ 158 degree Fahrenheit
FeatureHot-swappable input / output device that plugs in to a 40 Gigabit Ethernet Cisco QSFP port
Interoperable with other IEEE-compliant 40GBASE interfaces where applicable
Cisco quality identification (ID) feature that enables a Cisco platform to identify - optics supported by Cisco technology
Dimensions0.50" x 0.70" x 2.90"
Weight0.22 lb.
Shipping weight0.02 kg
Package size130 × 150 × 1 mm

Questions about this item

How do I install the QSFP-40G-SR4-S= into a Cisco 40G QSFP port and which step is often missed?

Slide the module straight into the port until the latch clicks; the step people miss is removing the dust caps from both the transceiver and the MPO patch cord before insertion.

What maintenance or replacement will the QSFP-40G-SR4-S= need over time?

The MPO connector end-faces should be inspected and cleaned with a lint-free wipe and isopropyl alcohol whenever links show errors; the module itself has no user-serviceable parts and is replaced only if it fails.

What limit appears first when the QSFP-40G-SR4-S= runs continuously at full load?

The operating temperature ceiling of 158 °F is the first sustained-use limit; if chassis airflow cannot keep the module below that, the link will throttle or shut down.

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