Juniper EX 3400 48-port EX3400-48T 10/100/1000BaseT Ethernet Switch

Juniper EX 3400 48-port EX3400-48T 10/100/1000BaseT Ethernet Switch with 4 x 1/10GbE SFP/SFP+ and 2 x 40GbE QSFP+ uplink ports

The Juniper Networks EX3400-48T is a high-performance enterprise access Ethernet switch built for modern campus networks that carry converged data, voice, and video traffic. Designed for wiring-closet deployments and scalable network growth, the EX3400-48T combines 48x 10/100/1000Base-T access ports with high-speed uplinks—making it an excellent fit for offices, schools, retail chains, and multi-floor buildings where you need reliable access switching today and a clear upgrade path tomorrow.

One of the biggest advantages of the EX3400 family is how it simplifies operations as you scale. The platform supports Virtual Chassis, letting multiple switches operate as a single logical device with unified management and configuration. It is also hardware-ready for Junos Fusion Enterprise, where access switches can operate as satellite devices in a larger design—helpful when you want to reduce operational overhead across many closets and sites. These capabilities are core to the EX3400 value proposition for fast-growing organizations that want enterprise features without moving to a more complex access layer design.
Official Juniper EX3400 datasheet page (single external reference): https://www.juniper.net/us/en/products/switches/ex-series/ex3400-ethernet-switch-datasheet.html

Key highlights for buyers (high-intent)

Port density for campus access

• 48 x Gigabit Ethernet (10/100/1000Base-T) access ports for end devices (PCs, IP phones, printers, APs, cameras)

High-speed uplinks for aggregation

• 4 x 10GbE SFP+ uplink/expansion capability

• 2 x 40GbE QSFP+ uplink capability for high-throughput uplink to core/distribution

Scalable design

• Virtual Chassis for simplified scaling and “pay-as-you-grow” expansion across closets

• Junos Fusion Enterprise-ready for large-scale access deployments

Why the EX3400-48T is a strong enterprise access switch

1) Built for converged networks (data + voice + video)

Enterprise access networks don’t just connect PCs anymore. They carry real-time services like VoIP, video meetings, and streaming—plus business apps and cloud traffic. The EX3400-48T is positioned specifically for these converged environments, where consistent performance, stable forwarding, and manageable scaling matter over time.

2) Easier management with Virtual Chassis

As networks expand, the biggest pain isn’t adding hardware—it’s the day-to-day management across multiple switches. With Virtual Chassis, you can interconnect multiple EX3400 switches and manage them as one logical device, reducing configuration duplication and simplifying upgrades and monitoring. For organizations adding new floors, departments, or branches, this provides a cleaner scaling model than treating every switch as a separate island.

3) Ready for large-scale access with Junos Fusion Enterprise

For environments with many wiring closets, Junos Fusion Enterprise enables a centralized operational model where access switches can operate as satellite devices under an aggregation layer. This is designed to reduce operational complexity in larger deployments while keeping your access layer consistent.

4) Flexible uplink options for modern backbones

The EX3400 line supports a mix of 10GbE and 40GbE uplinks, helping you connect to upstream distribution/core layers efficiently. This matters when your access layer grows and you need more uplink capacity without replacing the entire switch fleet.

Detailed specifications (as provided)

General

• Manufacturer: Juniper Networks, Inc

• Brand/Series: Juniper EX Series

• Model: EX3400-48T

• Part Number: B-EX3400-48T-3S-E

• Product Type: Ethernet Switch

Interfaces / Ports

• Total network ports: 48

• Port details:

  • 48 x Gigabit Ethernet (10/100/1000Base-T)

  • 4 x 10 Gigabit Ethernet expansion (SFP+)

  • 2 x 40 Gigabit Ethernet uplink (QSFP+)

• Uplink: Yes

• Modular: Yes

• Stack port: Yes

Media & Performance

• Media supported: Optical Fiber, Twisted Pair

• Ethernet technology: 1GbE / 10GbE / 40GbE

• Network technology: 10/100/1000Base-T, 10GBase-X, 40GBase-X

Layer / Management

• Layer supported: Layer 3

• Manageable: Yes

Power

• Power source: Power Supply

• Redundant power supported: Yes

• Package contents: EX3400-48T switch + 1 x AC PSU

Physical

• Rack unit: 1U

• Form factor: Rack-mountable, Wall-mountable

• Dimensions: 1.7″ (H) x 17.4″ (W) x 13.8″ (D)

• Weight: ~10.49 lb

Environmental

• Certifications: RoHS-6, WEEE, REACH, China RoHS, Green Dot

• Environmentally friendly: Yes

Ideal use cases (helps SEO + conversion)

• Campus access switching for offices, schools, and enterprise buildings

• Wiring closets needing high port density with uplink growth options

• VoIP + video-ready access networks with scalable management

• Multi-switch deployments where Virtual Chassis reduces operational overhead

• Growing networks planning 10GbE/40GbE uplinks to distribution/core layers