Juniper EX3400-48P 48-Port Gigabit PoE+ Layer 3 Switch – 4x 10G SFP+, 2x 40G QSFP+, Virtual Chassis

Stackable, redundant Juniper access switching with 10G and 40G uplinks.

The Juniper EX3400-48P is a 48-port Gigabit PoE+ switch from the Juniper EX3400 line, with 4 x 1/10GbE SFP+ and 2 x 40GbE QSFP+ uplinks and a 1,440W PoE budget. Running Junos OS, it is built for enterprise campus and branch access closets.

What the EX3400-48P Fixes in Branch and Campus Networks

As more devices connect at the network edge, access switches are expected to deliver power, segmentation and visibility, not only connectivity. Entry-level switches often lack consistent software, centralized management and the uplink capacity needed when dozens of access points and cameras share one closet.

The EX3400-48P runs Junos OS, the same operating system used across Juniper routers and switches, so configuration templates, automation scripts and troubleshooting skills carry over from branch to core. It supports Layer 2 and Layer 3 features including VLANs, 802.1X, QoS, static routing and RIP, with OSPF and advanced features enabled through Juniper licenses.

Its 4 x 1/10GbE SFP+ and 2 x 40GbE QSFP+ uplinks and Virtual Chassis support (up to 10 switches) keep the closet simple to scale: add switches to the same Virtual Chassis and manage them as one device, either from the CLI or from Juniper Mist cloud with AI-driven insights.

30W PoE for Access Points, Phones and Cameras

Every access port supplies up to 30W (802.3at), from a power budget of up to 1,440W (with two power supplies). That covers Wi-Fi access points, IP phones, cameras and badge readers without separate power supplies.

Built for Uptime in the Wiring Closet

The EX3400-48P uses dual hot-swappable ac power supplies (jpsu-920-ac-afo) and 2 hot-swappable fan modules, so a failed component can be replaced without taking the switch offline. Graceful Routing Engine switchover and nonstop bridging keep Virtual Chassis stacks stable during failures.

How to Set Up the Juniper EX3400-48P

1. Rack-mount the switch (or place compact models on a desk or wall), connect power, and keep the airflow path clear.
2. Connect the uplink ports to your aggregation or core switch using SFP+/QSFP optics or DAC cables, then patch access devices to the RJ-45 ports.
3. Run the Junos initial setup through the console port, J-Web or EZsetup, or claim the switch in Juniper Mist for zero-touch provisioning.
4. Configure VLANs, 802.1X, QoS, PoE priorities and Virtual Chassis, upgrade to the recommended Junos release, and commit the configuration.