Enterprise-Grade Gigabit Access with High-Speed Uplinks — The Juniper EX4300-48T Managed Switch.
The Juniper EX4300-48T is a scalable, high-performance managed Gigabit Ethernet switch designed for enterprise access, campus, and branch networks. Featuring 48 Gigabit RJ-45 ports and 4 built-in 40 GbE QSFP+ uplinks, it delivers robust connectivity and aggregation bandwidth for demanding environments. Powered by Juniper’s Junos OS, the EX4300-48T supports comprehensive Layer 2 switching, advanced Layer 3 routing, and Virtual Chassis technology — enabling up to 10 switches to operate as one logical device for simplified management and increased resiliency. Its rack-mount design, modular uplink options, and enterprise-grade features make it ideal for network edge deployments that require performance, flexibility, and ease of scaling.
Model: EX4300-48T
Series: Juniper EX4300 Line of Ethernet Switches
Type: Managed Gigabit Layer 2/Layer 3 Access Switch
Operating System: Juniper Junos OS — enterprise-grade network OS used across Juniper’s switches and routers.
Key Features
Ports & Connectivity
48 × 10/100/1000 BASE-T RJ-45 Ports — full Gigabit access layer connectivity for desktops, servers, VoIP phones, wireless APs, and other endpoints.
4 × 40 GbE QSFP+ Ports — built-in high-speed uplinks used for aggregation, stacking, or Virtual Chassis interconnect (transceivers sold separately).
Optional Uplink Modules: You can install an optional 4-port 1 Gb/10 Gb SFP+ uplink module for flexible uplink links.
No PoE Support — this model does not provide Power-over-Ethernet on access ports.
Performance & Capacity
Switching Capacity: ~496 Gbps bidirectional.
Backplane (Virtual Chassis) Speed: 320 Gbps — used when multiple switches are stacked as one.
Forwarding Throughput: ~369 Mpps (wire speed with 64-byte packets).
MAC Address Table: Supports up to 64,000 MAC addresses.
VLAN Support: Up to 4093 VLANs.
Jumbo Frames: Up to 9216 bytes.
Layer 2 / Layer 3 & Software Features
Full Layer 2 switching including VLANs, STP/RSTP/MSTP, Link Aggregation (LACP), QoS, and ACLs.
Layer 3 Support: Static IPv4/IPv6 routing and enhanced routing protocols (like OSPF, BGP) available depending on Junos OS feature set.
Management & Monitoring: CLI, SNMP, sFlow, J-Web GUI, SSH, and advanced monitoring/troubleshooting tools.
Virtual Chassis Technology: Stack up to 10 EX4300 switches and manage them as a single logical switch — simplifies configuration, scaling, and resiliency.
Hardware & Physical Specs
Form Factor: 1 RU rack-mountable chassis.
Dimensions: Approx. 17.4″ x 1.7″ x 16.4″ (44.2 x 4.3 x 41.7 cm).
CPU & Memory: ~1.5 GHz dual-core CPU with 2 GB DRAM + 2 GB Flash.
Power: AC power supply (typically 350 W AC PSU included; additional redundant PSUs optional).
Fans: Field-replaceable fans for enhanced cooling and uptime.
Typical Use Cases
Enterprise Access Switch for wired edge connectivity.
Campus Networks & Wiring Closets requiring scalable performance.
Aggregation Layer for high-bandwidth uplinks.
Virtual Chassis Stacking to consolidate management of multiple switches.
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