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by Arista
Product Line: Arista QSFP-40G-ER4
Product Type: Transceiver
Original price $0.00 - Original price $4,991.00
Original price
$0.00 - $4,991.00
Current price $4,991.00
Title: Surplus

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Product Description

The Cisco 40GBASE-ER4 Module is designed for SMF with OTU-3 data-rate support, featuring a 1310 nm wavelength across four lanes with individual wavelengths at 1271 nm, 1291 nm, 1311 nm, and 1331 nm. It supports a maximum cable distance of 40km with a connector type of LC, and operates within a temperature range of 0°C to 70°C, ensuring consistent performance across varied environmental conditions. The module exhibits a power consumption of 3.5W, with transmit power ranging from -2.7 dBm to 4.5 dBm per lane, and receive power between -21.2 dBm and -4.5 dBm per lane, accommodating extensive network demands while maintaining efficiency.

Key Feature for the QSFP-40G-ER4

  • What is the maximum cable distance supported by the Cisco 40GBASE-ER4 Module?
    The Cisco 40GBASE-ER4 Module supports a maximum cable distance of 40km on single-mode fiber.
  • Can the 40GBASE-ER4 operate within industrial temperature ranges?
    Yes, the operating temperature range for the 40GBASE-ER4 is between 0°C and 70°C, making it suitable for various environmental conditions.
  • What type of connector does the 40GBASE-ER4 module use?
    The module uses an LC connector type for optical fiber connections.
  • Is the 40GBASE-ER4 compatible with OTU-3 data-rate?
    Yes, the 40GBASE-ER4 module supports OTU-3 data-rate, making it versatile for different network needs.
  • What are the transmit and receive power ranges for the 40GBASE-ER4?
    The transmit power ranges from a maximum of 4.5 dBm to a minimum of -2.7 dBm per lane. The receive power ranges from a maximum of -4.5 dBm to a minimum of -21.2 dBm per lane.
  • How does the power consumption of the 40GBASE-ER4 compare to other modules?
    The 40GBASE-ER4 module has a power consumption of 3.5W, which is comparable to other high-performance modules like the 40G QSFP+ AOC, BIDI, UNIV, LRL4, LR4, PLR4, PLRL4, and ER4.
  • What wavelengths are used by the 40GBASE-ER4 for transmission?
    The 40GBASE-ER4 uses four wavelengths for transmission: 1271 nm, 1291 nm, 1311 nm, and 1331 nm.
  • What type of cable is required for the 40GBASE-ER4 module?
    The module requires single-mode fiber (SMF) for optimal performance over long distances.
  • What are the physical dimensions of the 40GBASE-ER4 module?
    The module measures 13.5 mm in height, 18.4 mm in width, and 72.4mm in depth.
  • Up to what altitude can the 40GBASE-ER4 module operate without issues?
    The module can operate up to an altitude of 10,000 feet without operational issues.

Product Review

The Arista QSFP-40G-ER4 module supports a 40km range over single-mode fiber (SMF) with a relatively efficient power consumption of 3.5W, making it suitable for extended reach data transmission needs in enterprise and data center networks. However, its transmit and receive power levels, with a maximum transmit power of 4.5 dBm per lane and a minimum receive sensitivity of -21.2 dBm per lane, indicate a need for precise power management to ensure optimal performance. Additionally, the module's compatibility with a wide operating temperature range (0°C to 70°C) and altitude (up to 10,000 ft) provides flexibility for deployment in varied environmental conditions, although the physical dimensions may require careful consideration in densely packed systems.


The Arista QSFP-40G-ER4 is a high-performance module designed for long-range data transmission over single-mode fiber (SMF), ensuring efficient connectivity solutions for data centers and enterprise networks. This module operates at a wavelength of 1310 nm and is compatible with the OTU-3 data-rate, making it suitable for a variety of applications that require high-speed data transfer. This product features an LC connector type, which is widely used in the industry due to its reliable and secure connection. The QSFP-40G-ER4 supports a cable distance of up to 40km, enabling long-distance communication without signal degradation. Its power consumption is rated at 3.5W, which is optimal for maintaining energy efficiency in high-density network environments. Key specifications include: - Transmit power ranging from a maximum of 4.5 dBm to a minimum of -2.7 dBm per lane, allowing for strong signal strength over long distances. - Receive power capabilities from a maximum of -4.5 dBm to a minimum of -21.2 dBm per lane, ensuring reception of signals even at low power. - The module utilizes four wavelength lanes: 1271 nm, 1291 nm, 1311 nm, and 1331 nm, providing flexibility and efficiency in data transmission. The operating temperature range of the QSFP-40G-ER4 spans from 0°C to 70°C, ensuring stable performance under varying environmental conditions. Moreover, it is designed to withstand storage temperatures ranging from -40°C to 85°C, offering durability and reliability for long-term use. Physical dimensions of the module are 13.5 mm in height, 18.4 mm in width, and 72.4 mm in depth, making it compact enough to fit into standard networking equipment without compromising on port density.
  • Supports 40G QSFP+ AOC and various 40GBASE modules, including SR4, XSR4, and ER4, as well as 25G variants like SR and LR, providing versatility in network design and application.
  • Rated for operation at altitudes ranging from 0 ft to 10,000 ft, ensuring consistent performance even in high-altitude locations.
  • Designed for minimal power consumption, with specific models consuming only 1.5 W, contributing to a lower total cost of ownership through energy savings.
The Arista QSFP-40G-ER4 is a reliable solution for extending network reach with high-speed data transmission capabilities. It is engineered to deliver consistent performance and connectivity across extended distances, making it an ideal choice for network expansion projects, data center interconnects, and enterprise networking needs.


Item Number Arista QSFP-40G-ER4
Product Type Cisco 40GBASE-ER4 Module compatible with single-mode fiber and supports OTU-3 data rate
Operational Wavelength 1310 nm
Fiber Compatibility Single-mode fiber (SMF) compatible with OTU3
End Connector LC
Fiber Type SMF
Maximum Reach 40 km
Energy Use 3.5 Watts
Maximum Output Power 4.5 dBm per channel
Minimum Output Power -2.7 dBm per channel
Peak Input Power -4.5 dBm per channel
Lowest Input Power -21.2 dBm per channel
Emission and Reception Wavelengths 1271 nm, 1291 nm, 1311 nm, 1331 nm across four channels
Lowest Operation Temperature 0°C
Highest Operation Temperature 70°C
Minimum Storage Temperature -40°C
Maximum Storage Temperature 85°C
Height 13.5 mm
Width 18.4 mm
Depth 72.4 mm
Power Usage for Various Modules 1.5 W for SFP+ modules; 3.5 W for 40G QSFP+ modules
Lowest Elevation for Operation 0 ft
Highest Elevation for Operation 10,000 ft

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