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by Arista
Product Line: QSFP-40G-LR4
Product Type: transceiver
Original price $255.00 - Original price $1,131.00
Original price
$255.00 - $1,131.00
Current price $1,131.00
Title: Surplus

Orders typically ship within 1-3 Business days, if you need an item to ship sooner please contact us.

Product Description

The QSFP-40G-LR4 is a 40GBASE-LR4 QSFP+ transceiver that operates over a wavelength range of CWDM 1271~1331nm, utilizing four CWDM channels (1271, 1291,1311, and 1331nm) to achieve a high channel capacity of 40 Gbps, with a transmission data rate of up to 10.3Gbps per channel. Designed for long-reach applications, it supports links up to 10km on single-mode fiber (SMF) and is compliant with the QSFP+ MSA, featuring a dual-LC connector. This transceiver also supports Digital Diagnostics Monitoring (DDM), operates within a temperature range of 0°C to 70°C, and has a low power dissipation of <3.5 W.

Key Feature for the QSFP-40G-LR4

  • What is the data rate supported by the 40GBASE-LR4 QSFP+ Transceiver?
    The transceiver supports a data rate of up to 10.3Gbps per channel, with a total channel capacity of 40 Gbps.
  • Can the part be used for long-distance transmission?
    Yes, it is designed for up to 10km links on single-mode fiber.
  • What type of wavelengths do the CWDM channels of this transceiver operate on?
    The transceiver operates on 4 CWDM channels: 1271, 1291, 1311, and 1331nm.
  • What are the minimum and maximum operating temperatures for this device?
    The operating temperature range is from 0°C to 70°C under standard conditions.
  • Does the 40GBASE-LR4 QSFP+ support Digital Diagnostics Monitoring (DDM)?
    Yes, it supports Digital Diagnostics Monitoring.
  • What is the power dissipation of the device?
    The power dissipation is less than 3.5 W.
  • What type of fiber is required for the 40GBASE-LR4 QSFP+ Transceiver?
    Single-mode fiber (SMF) is required for optimal performance.
  • Is the transceiver compliant with any standards?
    It is compliant with the QSFP+ MSA (Multi-Source Agreement).
  • What is the optical power budget of the transceiver?
    The optical power budget is 6.7 dB.
  • What are the minimum and maximum receiver power levels?
    The RX power levels range from -13.70 to +2.30 dBm.

Product Review

The Arista QSFP-40G-LR4 transceiver offers a high channel capacity of 40 Gbps, suitable for long-distance transmission up to 10km on single-mode fiber, leveraging CWDM technology across four channels (1271, 1291,1311, and 1331nm), which ensures broad compatibility and high data throughput. However, its power dissipation is less than 3.5W, indicating efficient energy use but necessitating consideration of thermal management in densely packed systems. Additionally, while it supports Digital Diagnostics Monitoring (DDM) for enhanced maintenance capabilities, the operating temperature range is limited to 0°C to 70°C, potentially restricting its deployment in environments with extreme temperature conditions without additional climate control measures.


The Arista QSFP-40G-LR4 is a high-performance 40GBASE-LR4 QSFP+ transceiver designed for long-range optical communication over single mode fiber. This transceiver module is optimized for 40G Ethernet links, offering a significant upgrade in data transmission speed and capacity for networking hardware. The device integrates four CWDM (Coarse Wavelength Division Multiplexing) channels with wavelengths ranging from 1271 to 1331 nm, enabling efficient and reliable long-distance communication. With a high channel capacity of 40 Gbps, the Arista QSFP-40G-LR4 transceiver distributes this bandwidth over four channels, each capable of transmitting data at rates up to 10.3 Gbps. This multi-lane distribution allows for robust data throughput, making it suitable for high-demand networking environments. The unit is capable of supporting links up to 10 kilometers on single mode fiber, providing flexibility for a wide range of network architectures and applications. Compliance with the QSFP+ MSA (Multi-Source Agreement) ensures that this transceiver is compatible with a broad array of networking equipment, allowing for seamless integration into existing infrastructures. The Arista QSFP-40G-LR4 also prioritizes energy efficiency, with a power dissipation of less than 3.5 W, which helps reduce operational costs and supports environmentally friendly networking solutions. Furthermore, the transceiver supports Digital Diagnostics Monitoring (DDM), a crucial feature for network management. DDM allows for real-time monitoring of the module's operational parameters, such as temperature, optical power output, and received signal strength, enabling proactive maintenance and troubleshooting to minimize downtime. Key Specifications: - Transmission data rate of up to 10.3 Gbps per channel across four CWDM channels (1271, 1291, 1311, and 1331 nm). - Supports links up to 10 km on single mode fiber, making it suitable for a wide range of long-distance networking applications. - Compliant with the QSFP+ MSA, ensuring compatibility with a wide range of networking equipment. The Arista QSFP-40G-LR4 also features a dual-LC connector, which is widely used and highly reliable for optical fiber connections. The optical power budget of 6.7 dB, along with TX and RX power ranges of -7 to +2.30 dBm and -13.70 to +2.30 dBm respectively, demonstrates the transceiver's capability to maintain high performance over the full distance of its reach. Operating temperature is another vital aspect of the QSFP-40G-LR4, with a standard operating case temperature range from 0 to 70 °C. Additionally, extended and industrial temperature ranges are available, from -5 to +85 °C and -40 to +85 °C respectively, offering flexibility for deployment in various environmental conditions. In summary, the Arista QSFP-40G-LR4 QSFP+ transceiver is a powerful and efficient solution for extending the reach and capacity of high-speed networking. Its adherence to industry standards, coupled with advanced features such as CWDM, low power consumption, and support for digital diagnostics, make it an essential component for modern, data-intensive network environments.


Product NumberArista QSFP-40G-LR4
Type40GBase-LR4 QSFP+ Module
Wavelength RangeCWDM 1270-1330nm
Bandwidth40 Gbps total
Data Rate per Lane10.3 Gbps
Maximum Distance10km over SMF
Channels4 CWDM (1271, 1291, 1311, 1331nm)
Standard ComplianceQSFP+ MSA
Max Power Consumption< 3.5W
Monitoring FeaturesSupports DDM
Temperature Range (Operating)0°C to 70°C
Ethernet Compatibility40GBASE-LR4
Transmit Wavelength1270-1330nm
Maximum Reach10km
Fiber TypeSingle Mode Fiber (SMF)
Performance Level40GBase
Connection InterfaceCWDM-LR4
Diagnostic SupportYes (DDM)
ConnectorLC Duplex
Optical Budget6.7 dB
Transmit Power Range-7 to +2.30 dBm
Receive Power Range-13.70 to +2.30 dBm
Standard Operating Temperature0°C to 70°C
Extended Operating Temperature-5°C to +85°C
Industrial Operating Temperature-40°C to +85°C

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