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by Juniper
Product Line: Juniper QFX3500 Series
Product Type: Switch
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Product Description

The QFX3500-48S4Q-AFOS Juniper switch features a switching capacity of 1.28 Tbps and 960 Mpps, with support for both cut-through and store-and-forward switching modes, tailored for high-performance networking environments. It is equipped with 48 SFP+/SFP ports and 4 QSFP+ ports, the latter of which can be configured as either a 4 x 10GbE interface or a 40 Gbps port, providing flexible connectivity options. The device is designed for reliability, featuring dual redundant (1+1) hot-pluggable power supplies, redundant fan trays, and supports both front-to-back and back-to-front airflow, ensuring optimal operation in various installation environments.

FAQs for the QFX3500-48S4Q-AFOS

  • What is the switching capacity of the QFX3500?
    The QFX3500 has a switching capacity of 1.28 Tbps and can handle up to 960 Mpps.
  • How many SFP+/SFP ports does this device feature?
    It features 48 SFP+/SFP ports and 4 QSFP+ ports.
  • Can the QSFP+ ports on the QFX3500 be configured for different interfaces?
    Yes, each QSFP+ port can be configured as a 4 x 10GbE interface or as a single 40 Gbps port.
  • What are the power supply options for the part specified?
    The device supports dual redundant (1+1) and hot-pluggable power supplies, with options for 110-240 V AC or -36 V to -72 V DC power.
  • What type of airflow configuration is available with the QFX3500?
    It offers the option for front-to-back or back-to-front airflow, accommodating different rack setups.
  • What is the weight and dimensions of this networking device?
    The device weighs 30.75 lb (13.95 kg) and measures 1.75 in (4.45 cm) in height, 17.25 in (43.82 cm) in width, and 28 in (71.12 cm) in depth.
  • How does the QFX3500 handle switching modes?
    It supports both cut-through and store-and-forward switching modes for efficient data processing.
  • What are the environmental operating conditions for the specified hardware?
    It operates within a temperature range of 32° to 104° F (0° to 40° C), with a relative humidity range of 5% to 90% (noncondensing).
  • Are there redundant fan trays available for the QFX3500?
    Yes, it comes with redundant fan trays that support port side-to-FRU side air flow for reliable cooling.
  • What kind of management ports are available on this device?
    It includes dual management ports, both in copper and fiber versions, for versatile connectivity options.

Product Review

The Juniper QFX3500-48S4Q-AFOS offers substantial flexibility with 48 SFP+/SFP and 4 QSFP ports, supporting both 10GbE and GbE, or 2/4/8 Gbps FC configurations, enhancing its utility in diverse network environments. Its dual redundant power supplies and choice between front-to-back or back-to-front airflow configurations ensure reliability and adaptability in various physical setups. However, the device's significant weight of 30.75 lb and depth of 28 in may present challenges in deployment and require careful consideration regarding rack space and installation logistics.


The Juniper QFX3500-48S4Q-AFOS is designed to meet the requirements of today's high-performance computing environments, offering a comprehensive solution for data center networking. With a switching capacity of 1.28 Terabits per second (Tbps) and a forwarding rate of 960 million packets per second (Mpps), this device ensures efficient data handling for both large and small packets. This switch supports both cut-through and store-and-forward switching modes, allowing for flexibility in managing traffic based on the specific needs of the network. The hardware includes 48 SFP+ ports, which can accommodate 36 dual-mode 10 Gigabit Ethernet (GbE) or Gigabit Ethernet (GbE) ports and 12 dual-mode 10GbE or 2/4/8 Gbps Fibre Channel (FC) ports. This versatility makes the QFX3500 suitable for a wide range of applications, from traditional data centers to high-demand computing environments. Additionally, the device features four QSFP+ ports, each capable of being configured as a 4 x 10GbE interface or as a single 40 Gbps port, offering further flexibility in network design and scalability. The presence of dual management ports (both copper and fiber versions) ensures that network administrators have the necessary access for management and troubleshooting. The QFX3500 is designed with reliability in mind, featuring redundant fan trays with options for port side-to-FRU side air flow, ensuring optimal cooling under various conditions. The switch supports both front-to-back and back-to-front airflow configurations, accommodating different rack setups and promoting efficient heat dissipation. Key specifications include: -
  • 48 SFP+ ports with flexibility for 10GbE or GbE and FC connectivity
  • Four QSFP+ ports for high-density 10GbE or 40GbE connections
  • Dual redundant (1+1) and hot-pluggable power supplies for continuous operation
With a weight of 30.75 lb (13.95 kg) including dual power supplies and fan modules, the QFX3500 is designed for ease of deployment in a standard 19-inch server rack, with dimensions that ensure a compact footprint in the data center. The switch operates reliably in a range of environmental conditions, with an operating temperature range of 32° to 104° F (0° to 40° C), and can function at altitudes of up to 2,000 meters. Its storage temperature range extends from -40° to 158° F (-40° to 70° C), and it can operate in relative humidity levels of 5% to 90% (non-condensing), ensuring resilience in various storage and operational contexts. Powering the QFX3500 can be achieved through either 110-240 V single phase AC power or -36 V to -72 V DC power, with dual redundant and hot-pluggable power supplies ensuring uninterrupted operation. This flexibility in power options, combined with its comprehensive set of features and capabilities, makes the Juniper QFX3500-48S4Q-AFOS a suitable choice for organizations looking to build or expand their network infrastructure with a reliable, high-performance switching solution.


Part Number and Manufacturer Juniper QFX3500-48S4Q-AFOS
Ports Configuration 48 SFP+/SFP, 4 QSFP, spare
Cooling System Exchangeable fan units, airflow from port side to FRU side
Performance Capacity 1.28 Terabits per second throughput, 960 Million packets per second switching
Processing Mode Supports both cut-through and store-and-forward mechanisms
Mass 30.75 pounds (13.95 kilograms) with both power supplies and fan units installed
Airflow Direction Configurable for front-to-back or back-to-front airflow
Back Interface Rear port connections available
High-speed Ports 48 SFP+ interfaces
Flexible Ethernet Ports 36 ports configurable for 10GbE or GbE
Fibre Channel and Ethernet Ports 12 ports configurable for 10GbE or 2/4/8 Gbps Fibre Channel
Enhanced Ports Four QSFP+ interfaces
QSFP+ Port Configuration Each can split into 4 x 10GbE or operate at 40 Gbps
Management Interface Dual management ports, both copper and fiber options
Physical Dimensions Height: 1.75 inches (4.45 cm), 1U; Width: 17.25 inches (43.82 cm); Depth: 28 inches (71.12 cm)
Installation Compatibility Designed for 19-inch server rack mounting
Power Supply Units Dual, hot-swappable, 1+1 redundant power supplies
Power Input 110-240 VAC, single-phase; -36 V to -72 V DC
Operating Temperature Range 32° to 104° F (0° to 40° C)
Storage Temperature Range -40° to 158° F (-40° to 70° C)
Maximum Operating Altitude Up to 2,000 meters
Humidity Tolerance While Operating 5% to 90%, non-condensing

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