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by Juniper
Product Line: Juniper EX3400 Series
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Product Description

The EX3400-48P-TAA is equipped with 48 10/100/1000BASE-T PoE+ ports, supporting up to 30W per port with a total PoE+ power budget of 740W/1440W. It features 4 x 1/10GbE SFP/SFP+ and 2 x 40GbE QSFP+ uplink ports, facilitating high-speed connectivity and network expansion. With a packet-switching capacity of 168 Gbps (unidirectional)/336 Gbps (bidirectional), redundant fans, and a 920W AC power supply, this switch is designed for efficient front-to-back airflow, ensuring optimal performance within operating temperatures of 32° F to 113° F.

FAQs for the EX3400-48P-TAA

  • What is the port configuration of the EX3400 TAA?
    The EX3400 TAA features 48 10/100/1000BASE-T PoE+ ports, 4 1/10GbE SFP/SFP+ ports, and 2 40GbE QSFP+ ports.
  • How much power does the included power supply unit (PSU) of the JPSU-920-AC-AFO provide?
    The included PSU provides 920 watts of power.
  • Can the EX3400 TAA support a full 30W of PoE+ on all its ports simultaneously?
    Yes, it can support up to 30W of PoE+ on all 48 ports simultaneously within its PoE+ power budget of 740W/1440W.
  • What are the dimensions of the device with the power supply installed?
    With the power supply installed, the device's dimensions are 17.36 x 1.72 x 15.05 inches (44.1 x 4.37 x 38.24 cm).
  • What is the maximum system power consumption of the EX3400 TAA?
    The maximum system power consumption is 120 watts.
  • What is the operating temperature range for the EX3400 TAA?
    The operating temperature range is from 32° F to 113° F.
  • How does the backplane capacity vary with the type of uplink ports used?
    The backplane capacity is 160 Gbps with QSFP+ ports or 80 Gbps with SFP+ ports.
  • What is the total packet-switching capacity of the EX3400 TAA?
    The EX3400 TAA has a packet-switching capacity of 168 Gbps unidirectional or 336 Gbps bidirectional.
  • How many total 10/100/1000BASE-T ports does the switch have, and are they all PoE+ enabled?
    The switch has a total of 48 10/100/1000BASE-T ports, and all are PoE+ enabled.
  • What are the storage temperature limits for the EX3400 TAA?
    The storage temperature limits are from -40° F to 158° F.

Product Review

The Juniper EX3400-48P-TAA offers a comprehensive suite of features suitable for high-density environments, including 48 PoE+ ports with a total power budget of 740W/1440W and versatile uplink options through 4 x 1/10GbE SFP/SFP+ and 2 x 40GbE QSFP+ ports. However, the system's maximum power consumption of 120W may limit its deployment in scenarios requiring higher energy demands. Additionally, its design incorporates redundant fans and front-to-back airflow, ensuring optimal cooling and reliability, but the physical dimensions and weight could pose challenges in constrained spaces.


The Juniper EX3400-48P-TAA is a networking switch designed for high-performance computing environments, featuring 48 10/100/1000BASE-T ports that support Power over Ethernet Plus (PoE+) with a power budget of 740W that can be expanded up to 1440W. This device is equipped with 4 x 1/10GbE SFP/SFP+ and 2 x 40GbE QSFP+ for uplink connectivity, providing flexible options for network expansion and connectivity to high-speed servers or network backbones. The switch includes one AC power supply unit (JPSU-920-AC-AFO), with a total power supply rating of 920W, ensuring reliable power delivery for connected devices. Designed for efficient operation in a range of environments, the EX3400-48P-TAA features redundant fans and front-to-back airflow, maintaining optimal cooling and system reliability. The device's physical dimensions are compact, measuring 17.36 inches in width, 1.72 inches in height, and 13.78 inches in depth for the base unit, with slight variations when the power supply and front module are installed. -
  • Backplane capacity reaches 160 Gbps using QSFP+ ports or 80 Gbps with SFP+ ports, supporting high-volume traffic and ensuring smooth data flow across the network.
  • Packet-switching capacities are robust, offering 168 Gbps unidirectional and 336 Gbps bidirectional, which facilitates efficient data handling and processing.
  • The system's operating temperature ranges from 32°F to 113°F, with a storage temperature tolerance between -40°F and 158°F, and it can operate at altitudes up to 10,000 feet, ensuring reliable performance in various environmental conditions.
With a total of 48 PoE+ ports, each capable of delivering up to 30W of power, the switch can fully support devices requiring higher power, such as advanced wireless access points, surveillance cameras, and VoIP phones, across all ports simultaneously. This capability, combined with a comprehensive PoE+ power budget, allows for extensive deployment of powered devices across the network without the need for additional power sources. The EX3400-48P-TAA's uplink options include 10GbE/GbE SFP+/SFP ports and 2 40GbE QSFP+ ports, providing high-speed connectivity options for linking to other switches, routers, or high-performance servers. This flexibility ensures that the network can adapt to changing demands and support future growth. In terms of performance, the device's packet-switching capacities and backplane capability ensure that it can handle high volumes of data traffic without bottlenecks, making it suitable for demanding applications and environments where data throughput and reliability are critical. The switch's physical and operational specifications, including dimensions, weight, operating temperatures, and altitude tolerance, ensure that it can be deployed in a variety of settings, from compact network closets to data centers, without concern for environmental conditions affecting performance. Overall, the Juniper EX3400-48P-TAA is engineered to meet the demands of modern network environments, offering a combination of performance, flexibility, and reliability that supports both current and future networking needs.


Item Number and Producer Juniper EX3400-48P-TAA
Description EX3400 TAA, 48-port 10/100/1000BASE-T Power over Ethernet Plus, 4 SFP/SFP+ ports for 1/10GbE, 2 QSFP+ ports for 40GbE, includes JPSU-920-AC-AFO AC power supply, supports redundant fans, designed for front-to-back airflow
Number of 10/100/1000BASE-T Ports 48
Number of PoE+ Ports Available 48 ports supporting up to 30W each
Power Supply Configuration AC
Allocated Power for PoE+ (Watts) 740W/1440W
Uplink Capabilities 4 SFP/SFP+ for 1/10GbE, 2 QSFP+ for 40GbE
Maximum Energy Consumption (Watts) 120
Power Supply Capacity (Watts) 920W
Size (Width x Height x Depth) Main unit: 17.36 x 1.72 x 13.78 inches; With PSU: 17.36 x 1.72 x 15.05 inches; With PSU and front module: 17.36 x 1.72 x 15.19 inches
Internal Bandwidth 160 Gbps using QSFP+ ports or 80 Gbps using SFP+ ports
Virtual Chassis Compatibility Supported
Total Weight System: 1.43 lb; Fan module: 0.16 lb
Ethernet Port Count 54 total (48 base ports plus 4 SFP/SFP+ and 2 QSFP+)
Switching Capacity 168 Gbps one-way/336 Gbps two-way
Minimum Operating Temperature 32°F
Maximum Operating Temperature 113°F
Minimum Storage Temperature -40°F
Maximum Storage Temperature 158°F
Operational Altitude Limit Up to 10,000 feet
Non-Operational Altitude Limit Up to 16,000 feet

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