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by Juniper
Product Line: Juniper Networks Transceivers
Product Type: QSFP+ 40G-ESR4
Original price $0.00 - Original price $1,865.00
Original price
$0.00 - $1,865.00
Current price $1,865.00
Title: Used

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Product Description

The QSFP+ 40G-ESR4 Juniper module, designed for multimode fiber (MMF), operates at a 850nm wavelength with an MPO connector type, supporting a 400m reach on OM3 fiber. It features 4 independent full-duplex channels, each capable of up to 11.2 Gbps data rate, and has a 2.4 dB optical power budget with DDM functionality for enhanced monitoring. The module requires a single +3.3V power supply, has a maximum power consumption of 1.5W, and operates within a temperature range of 0 to 70 °C (standard), with extended and industrial options available.

Key Feature for the QSFP+ 40G-ESR4

  • What is the form factor of the QSFP module suitable for 40GBase applications?
    The form factor of the module is QSFP.
  • Can the QSFP-40G-eSR4 be used with any cable type?
    No, it requires MMF (Multimode Fiber) for proper operation.
  • What is the maximum reach of the QSFP module designed for eSR4 interface?
    The maximum reach is 400m on appropriate multimode fiber.
  • Is DDM available on this module?
    Yes, DDM (Digital Diagnostic Monitoring) is supported.
  • What type of connector is used with the QSFP-40G-eSR4?
    An MPO (Multi-fiber Push On) connector type is used.
  • What is the operating temperature range for the QSFP module?
    The standard operating case temperature range is 0 to 70°C.
  • Does the QSFP-40G-eSR4 support transmission over OM3 multimode ribbon fiber?
    Yes, it supports up to 300m transmission on OM3 multimode ribbon fiber.
  • What are the minimum and maximum TX power levels of the QSFP module?
    The minimum TX power is -7.50 dBm and the maximum is 1.00 dBm.
  • How many independent full-duplex channels does the QSFP-40G-eSR4 have?
    It has 4 independent full-duplex channels.
  • What is the power supply voltage range for this module?
    The power supply voltage range is -0.5 to 3.6 V.

Product Review

The Juniper QSFP+ 40G-ESR4 offers a significant advantage in data center environments with its support for up to 400m reach on MMF, enabling efficient connectivity across extended distances. However, its optical power budget may limit performance in scenarios demanding higher transmission power or sensitivity. Additionally, the requirement for MPO connectors might necessitate additional investments in compatible infrastructure for organizations not already equipped with this technology.


The Juniper QSFP+ 40G-ESR4 is a high-performance, quad small form-factor pluggable plus transceiver designed for 40G data communications. It operates at a wavelength of 850nm and is optimized for extended reach, supporting transmissions up to 400m on multimode fiber (MMF). This transceiver is tailored for large-scale networking environments, offering a seamless upgrade path for data centers and high-end networking systems requiring higher bandwidth and longer reach. Key to its functionality is the 40GBase eSR4 interface, which enables high-speed data transfer rates across four independent full-duplex channels. Each channel is capable of achieving up to 11.2 Gbps data rate per wavelength, contributing to a total of 44.8 Gbps data throughput. This makes the Juniper QSFP+ 40G-ESR4 an ideal solution for applications demanding high bandwidth and efficient data distribution across networks. The transceiver employs an MPO connector type, facilitating easy and reliable connections. It's specifically designed to operate over MMF, with an optical power budget of 2.4 dB. The module's TX power ranges from a minimum of -7.50 dBm to a maximum of 1.00 dBm, while the RX power can handle signals from -9.9 dBm up to 2.4 dBm. These specifications ensure optimal performance over the specified reach, making it a reliable choice for extended data communication needs. Moreover, the Juniper QSFP+ 40G-ESR4 is equipped with Digital Diagnostic Monitoring (DDM), a feature that provides critical real-time monitoring of system parameters such as temperature, supply voltages, laser bias current, transmit optical power, and receive optical power. This enables proactive maintenance and immediate troubleshooting, ensuring network reliability and performance.
  • Supports up to 300m transmission on OM3 multimode ribbon fiber, ensuring extensive coverage for large-scale networking infrastructures.
  • Designed for low power consumption, with a maximum power requirement of 1.5W, contributing to energy-efficient network operations.
  • Offers flexibility in operating environments with a standard operating case temperature range of 0 to 70 °C, and options for extended and industrial temperature ranges, accommodating various deployment scenarios.
The transceiver's electrical interface is CML compatible, and it operates on a single +3.3V power supply, highlighting its compatibility with a wide range of networking equipment. Its power supply voltage ranges from -0.5 to 3.6 V, further underscoring the device's operational versatility. In terms of durability and longevity, the Juniper QSFP+ 40G-ESR4 is designed to withstand harsh conditions, with a storage temperature range of -40 to +85 °C. This ensures that the transceiver remains functional and reliable over time, regardless of environmental challenges. In conclusion, the Juniper QSFP+ 40G-ESR4 transceiver is a high-capacity, efficient networking solution that meets the demands of modern data centers and networking systems. Its combination of high-speed data transmission, extended reach, low power consumption, and robust monitoring capabilities make it an essential component for building advanced, high-performance networking infrastructures.


Item Number Juniper QSFP+ 40G-ESR4
Manufacturer Juniper
Module Form QSFP
Emission Wavelength 850 nanometers
Maximum Distance 400 meters
Fiber Type Multimode Fiber
Speed Grade 40GBase
Communication Standard eSR4
Digital Diagnostics Monitoring Supported
Connection Interface MPO
Optical Link Budget 2.4 decibels
Minimum Transmit Power -7.50 dBm
Maximum Transmit Power 1.00 dBm
Minimum Receive Power -9.9 dBm
Maximum Receive Power 2.4 dBm
Channel Configuration Four full-duplex channels
Bandwidth per Channel 11.2 Gbps
Fiber Connector Type MTP/MPO
Distance on OM3 Fiber Up to 300 meters
Power Requirement +3.3V
Electrical Interface CML
Operational Temperature Range 0°C to 70°C (Standard)
Expanded Temperature Range -5°C to +85°C
Industrial Temperature Range -40°C to +85°C
Peak Power Usage 1.5 Watts
Temperature for Storage -40°C to +85°C
Electrical Power Range -0.5V to 3.6V

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