Startech Cisco QSFP-40G-LR4-S Compatible QSFP+ - 40 Gb Fiber 40GBase-LR4 QSFP+ Transceiver Module - SM - 10 km [6.2 mi.] - 1270 to 1330nm (qsfp40glr4s) QSFP40GLR4S_18

Usually ships the same or next business day. In stock at our PA warehouse.
Calculated at Checkout
Stock Update:
09/27/2022 09:07:17 PM PST
  • Main
  • Alternate-Image2
  • Alternate-Image1
Stock Update:
09/27/2022 09:07:17 PM PST


This item is brand-new, factory sealed.

Count on powerful performance and cost-effective 40 Gigabit Ethernet connections over single-mode fiber with this QSFP+. This Cisco® compatible 40GBase QSFP+ (Quad Small Form-Factor Pluggable) is engineered by to deliver what you want most in your network connections: reliable performance. Built to exacting specifications and fully tested to ensure maximum performance, you can install this high-quality fiber transceiver module into Cisco networking devices that support the Cisco QSFP-40G-LR4-S, as well as other major brands of networking equipment.

With powerful four-lane performance, this 40GBase-LR4 QSFP+ transceiver module delivers 40 Gigabit connectivity over single-mode fiber with a wavelength of 1270nm to 1330nm and a range of up to 10 km (6.2 mi.). It provides a dependable and cost-effective way to add, replace or upgrade the ports on your networking equipment, and it's backed by a lifetime warranty.

Built for reliable network performance

This 40GBase-LR4 QSFP+ is manufactured by to meet or exceed OEM specifications and comply with the industry's MSA (Multi-Source Agreement) standards. Committed to the highest standards of quality, provides an extensive range of networking products including copper and fiber network cards, fiber media converters, Ethernet switches and wireless products.

Fully compatible with Cisco and other major brands

The 40 Gigabit single-mode QSFP+ is engineered to the highest quality standards and is 100% Cisco compatible, equivalent to the Cisco QSFP-40G-LR4-S optical transceiver. The QSFP+ transceiver module is configured and fully tested to ensure it works seamlessly with Cisco or other major brands of networking equipment.

You can be assured that the use of QSFP+ products should not affect the warranty protection of your networking equipment.

Convenient and scalable

Delivering both convenience and scalability, this fiber QSFP+ transceiver is fully hot-pluggable, which enables you to install it without interrupting network traffic or having to reboot your equipment. It provides a versatile and cost-effective solution that's compatible with a range of 40 Gigabit networking devices.

Ideal for use in Cisco switches, routers and other networking equipment, the QSFP+ optical transceiver provides reliable performance, allowing you to expand your network to remote segments cost-effectively. The SM fiber transceiver module supports Digital Diagnostics Monitoring (DDM / DOM), a maximum distance of up to 10 km (6.2 mi.), and maximum data rates of up to 40Gbps.

You can count on QSFP40GLR4S for reliable performance, backed by a lifetime warranty and free lifetime technical support.


Environmental Certification:



Environmentally Friendly:   


  • MSA Compliant
Cisco Firepower Switches:
  • ASR1000
  • ASR9000
  • C9300
  • C3850


Country of Origin:   



Physical Characteristics
Form Factor
Weight (Approximate)0.10 lb
Limited WarrantyLifetime
Total Number of Ports1
Connector TypeLC
Interfaces/Ports Details1 x LC Duplex 40GBase-LR4 Network
General Information
Manufacturer Website Address
Marketing InformationThe QSFP40GLR4S is a Cisco QSFP-40G-LR4-S compatible fiber transceiver module that has been designed, programmed and tested to work with Cisco™ brand switches and routers. It delivers dependable 40 GbE connectivity over fiber cable, for 40GBASE-LR4 compliant networks, with a maximum distance of up to 10 km (6.2 mi).
Technical Specifications:
Wavelength: 1270nm to 1330nm
Maximum Data Transfer Rate: 40 Gbps
Type: Single Mode Fiber
Connection Type: LC Connector
Maximum Transfer Distance: 10 km (6.2 mi)
MTBF: 1,489,426 hours
Power Consumption: Less than 2.5 Watts
Digital Diagnostics Monitoring (DDM): Yes
This QSFP+ fiber module is hot-swappable, making upgrades and replacements seamless by minimizing network disruptions. SFPs
All SFP & SFP+ transceiver modules are backed by a lifetime warranty and free lifetime multilingual technical support. offers a wide variety of SFP modules and direct-attach SFP cables, providing the convenience and reliability you need to ensure dependable network performance.
Product TypeQSFP+
Product NameCisco QSFP-40G-LR4-S Compatible QSFP+ Transceiver Module - 40GBASE-LR4
Manufacturer Part NumberQSFP40GLR4S
Packaged Quantity1
Media & Performance
Ethernet Technology40 Gigabit Ethernet
Media Type SupportedOptical Fiber
Fiber Mode SupportedSingle-mode
Network Technology40GBase-LR4
Technical Information

View AllClose

Warranty Information

All Items are Brand New, Factory Sealed and come with a standard warranty. [Read our policies]
View AllClose
Main Cisco QSFP-40G-LR4-S Compatible QSFP+ - 40 Gb Fiber 40GBase-LR4 QSFP+ Transceiver Module - SM - 10 km [6.2 mi.] - 1270 to 1330nm (qsfp40glr4s) QSFP40GLR4S_18