Technical Specifications:

• Part Number: 650-044930 (Full Assembly), EX4300-48P (Model)
• Additional Part Numbers: 520-052133
• Product Line: Juniper Networks EX4300 Series Ethernet Switches
• Form Factor: 1RU (1U) rack-mountable
• Management Type: Layer 3 Managed Switch with Virtual Chassis Support

Port Configuration:

• Access Ports: 48 x 10/100/1000BASE-T Gigabit Ethernet RJ-45 ports
  • All 48 ports equipped with Power over Ethernet Plus (PoE+)
  • Auto-sensing, auto-MDI/MDIX
  • Port speed downshift and maximum advertised speed configuration available
• Uplink Ports: 4 x QSFP+ (Quad Small Form-Factor Pluggable Plus) ports
  • Support for 40 Gigabit Ethernet QSFP+ transceivers
  • Can function as Virtual Chassis ports or upstream uplinks
  • Pre-configured for high-speed Virtual Chassis backplane connections
• Optional Expansion: 1 x front-panel uplink module slot
  • Supports EX-UM-4X4SFP module (4-port 10-Gigabit Ethernet SFP+ uplink module)
  • Provides four additional SFP+ ports for 1GbE or 10GbE connections
  • Total maximum ports: 56 (48 host + 4 QSFP+ + 4 optional SFP+)

Power over Ethernet (PoE+):

• PoE Standard: IEEE 802.3af (PoE) and IEEE 802.3at (PoE+) compliant
• PoE Ports: All 48 Gigabit Ethernet ports support PoE+
• Power per Port: Up to 30W per port (PoE+)
• Total PoE Budget: Up to 1,000W+ (dependent on power supply configuration)
• Powered Device Support: IP phones, wireless access points, security cameras, IoT devices, video conferencing systems

Performance Specifications:

• Switching Capacity: 128 Gbps (non-blocking wire-speed)
• Throughput: 95.2 Mpps (Million packets per second)
• Latency: Ultra-low latency for real-time applications
• ASIC Architecture: Single ASIC-based Packet Forwarding Engine (EX-PFE)
• MAC Address Table: 16,000 entries

Processing & Memory:

• Processor: Dual-core PowerPC P2020 @ 1.5 GHz per core (E500MC cores)
• System Memory (DRAM): 2 GB DDR3
• Flash Storage: 8 MB boot flash
• Cache:
  • L1 Cache: 32 KB D-cache, 32 KB I-cache
  • L2 Cache: 128 KB
  • Corenet Platform Cache: 1024 KB (1 MB)

Virtual Chassis & Stacking:

Juniper's Virtual Chassis technology transforms multiple EX4300 switches into a single logical device:

• Stack Size: Up to 10 switches in a single Virtual Chassis configuration
  • Can mix EX4300 and EX4600 switches in same Virtual Chassis
  • Integration with QFX3500, QFX3600, and QFX5100 for hybrid deployments
• Virtual Chassis Bandwidth: 320 Gbps backplane using four 40GbE QSFP+ ports
• Single Management Interface: Entire Virtual Chassis managed as one logical switch
• Chassis-like Operations: Slot/module/port numbering schema consistent with Juniper chassis platforms
• High Availability: Dual Routing Engines for control plane redundancy
• Hot-Swap Members: Add or remove switches without service disruption
• Total Port Density: Up to 480 ports (10 x 48-port switches) in single Virtual Chassis

Layer 2 Features:

• VLANs: IEEE 802.1Q VLAN tagging, port-based and tagged VLANs
• Spanning Tree Protocols: STP, RSTP (802.1w), MSTP (802.1s)
• Link Aggregation: IEEE 802.3ad Link Aggregation Control Protocol (LACP)
• Jumbo Frames: Support for frames up to 9,216 bytes
• Loop Protection: Advanced loop detection and prevention mechanisms
• MAC Learning: Dynamic and static MAC address learning

Layer 3 Routing:

• Static Routing: IPv4 and IPv6 static routes
• RIP v1/v2: Routing Information Protocol
• OSPF v2/v3: Open Shortest Path First for dynamic routing
• BGP: Border Gateway Protocol support
• Virtual Router Redundancy Protocol (VRRP): First-hop redundancy
• Policy-Based Routing: Flexible traffic engineering capabilities
• Multicast Routing: IGMP v1/v2/v3, PIM-SM, PIM-DM
• IPv6 Support: Comprehensive IPv6 routing and management

Quality of Service (QoS):

• Classification: L2-L4 criteria including interface, MAC address, Ethertype, 802.1p, VLAN, IP address, DSCP/IP precedence, TCP/UDP port numbers
• Queue Management: 12 queues per port for granular traffic prioritization
• Congestion Avoidance: Tail drop, Weighted Random Early Detection (WRED)
• Traffic Shaping: Hierarchical scheduling and shaping capabilities
• Priority Queuing: Strict priority and weighted round-robin scheduling

Security Features:

• IEEE 802.1X: Port-based network access control with RADIUS/TACACS+ authentication
• EAP Types Supported: MD5, TLS, TTLS, PEAP
• MAC Authentication: MAC-based authentication for non-802.1X devices
• Access Control Lists (ACLs): Port-based, VLAN-based, and router ACLs with Layer 2-4 filtering
• Control Plane DoS Protection: Rate limiting to protect control plane from attacks
• DHCP Snooping: Protection against rogue DHCP servers
• Dynamic ARP Inspection (DAI): Prevents ARP spoofing attacks
• IP Source Guard: Prevents IP address spoofing
• Storm Control: Broadcast, multicast, and unknown unicast suppression
• Secure Management: SSHv2, SNMPv3, HTTPS, TACACS+, RADIUS

High Availability Features:

• Redundant Power Supplies: Dual hot-swappable, load-sharing power supply slots
• Redundant Fans: Dual hot-swappable fan modules with different airflow directions available
• Graceful Routing Engine Switchover (GRES): Hitless Layer 2 forwarding and Layer 3 protocol failover
• Nonstop Active Routing (NSR): Continuous packet forwarding during RE switchover
• Nonstop Bridging (NSB): Uninterrupted Layer 2 forwarding during control plane failures
• Bidirectional Forwarding Detection (BFD): Fast failure detection for routing protocols

Power Supply Options:

• Model: JPSU-1100-AC-AFO (commonly included)
• Capacity: 1100W AC
• Airflow Direction:
  • AFO (Air Out) - Front-to-back airflow
  • AFI (Air In) - Back-to-front airflow
• Redundancy: 1+1 redundant power supply configuration supported
• Hot-Swappable: Field-replaceable without powering down the switch
• Auto-Sensing: 100-240V AC auto-ranging input

Important Note: The "-S" SKU variants (EX4300-48P-S) ship without pre-installed power supplies or fans; these must be ordered separately.

Cooling System:

• Fan Modules: 2 x hot-swappable fan modules (EX4300-FAN)
• Airflow Options:
  • AFI (Air In) - Back-to-front airflow for cold aisle deployment
  • AFO (Air Out) - Front-to-back airflow for hot aisle deployment
• Redundancy: N+1 fan redundancy for continuous operation
• Important: Fan modules and power supplies must have matching airflow directions

Management & Monitoring:

Juniper Mist Cloud Architecture:

• Cloud-based onboarding, provisioning, and management
• Mist Wired Assurance for AI-powered automation and service levels
• Better connected device experiences through intelligent analytics

Traditional Management:

• CLI: Industry-standard command-line interface
• J-Web Interface: Integrated web-based GUI management
• SNMP: v1/v2c/v3 for integration with network management systems
• Out-of-Band Management: Dedicated management Ethernet port
• Console Port: RJ-45 serial console for local access
• USB Port: Console access via USB interface

Automation & Programmability:

• NETCONF: XML-based network configuration protocol
• PyEZ: Python library for Junos automation
• REST API: Representational State Transfer API
• Ansible: Integration with Ansible automation platform
• Zero Touch Provisioning (ZTP): Automated initial configuration

Junos Operating System:

• OS: Juniper Junos OS (modular, carrier-class network operating system)
• Software Version: Ships with Junos 13.2X51 or later (upgradeable)
• Consistent Platform: Same OS across Juniper routers, switches, and security devices
• Proven Reliability: Field-tested OS with extensive deployment history
• Single Configuration File: Simplifies Virtual Chassis management

Physical Specifications:

• Dimensions: 1.72" H × 17.4" W × 18.25" D (1U rack unit)
• Weight: Approximately 15 lbs (6.8 kg) with single power supply
• Mounting: 1RU 19-inch rack-mountable with included rack-mount kit (EX-RMK)
• Operating Temperature: 32°F to 113°F (0°C to 45°C)
• Storage Temperature: -40°F to 158°F (-40°C to 70°C)
• Humidity: 10% to 85% (non-condensing)

Standards Compliance:

• Safety: UL 60950-1, CAN/CSA 22.2 No. 60950-1, EN 60950-1, IEC 60950-1
• Electromagnetic Compatibility: FCC Part 15 Class A, EN 55022 Class A, VCCI Class A
• Immunity: EN 55024, EN 300 386
• RoHS Compliance: EU Directive 2002/95/EC

Supported Protocols & RFCs:

The EX4300-48P supports hundreds of industry-standard protocols including IEEE 802.1, 802.3, IPv4/IPv6, OSPF, BGP, MPLS, VPLS, and many more. Comprehensive protocol support ensures interoperability with multi-vendor network environments.

Ideal Applications:

• Campus Access Layer: High-density Gigabit access for educational institutions and corporate campuses
• Branch Office Networking: Complete Layer 2/3 switching with PoE for remote locations
• Data Center Top-of-Rack (ToR): Access switching for server connectivity with 40GbE uplinks
• Wiring Closet Deployments: Space-efficient 1U design ideal for crowded IDF/MDF locations
• Wireless Network Infrastructure: Power and connect high-density wireless access point deployments
• IP Surveillance: Support IP cameras with PoE across large facilities
• VoIP Deployments: Enterprise IP telephony with PoE for desk phones
• IoT Connectivity: Connect and power IoT sensors and controllers

Included Components:

Typical full assembly (650-044930) includes:

• 1 x Juniper EX4300-48P Switch
• 1 or 2 x AC Power Supply (JPSU-1100-AC-AFO or AFI)
• 2 x Fan Modules (EX4300-FAN)
• 1 x Rack-mount kit (EX-RMK)
• 1 x AC Power Cord (CAB-NOTCH)
• Console cable (may vary)

Note: Some configurations ship without power supplies or fans (especially "-S" SKU variants). Verify included components before ordering.

Warranty & Support:

• Warranty and support vary based on purchase source
• Juniper offers various service and support packages
• End-of-Life and support dates should be verified with Juniper Networks

Why Choose the Juniper EX4300-48P:

The EX4300-48P delivers carrier-class reliability with the flexibility and economics of a stackable switch platform. With comprehensive PoE+ support across all 48 ports, Virtual Chassis technology enabling up to 10 switches (480 ports) to operate as a single logical device, and robust Layer 3 routing capabilities powered by proven Junos OS, this switch provides an ideal foundation for growing enterprise networks. The combination of high-speed 40GbE uplinks, optional 10GbE expansion, dual redundant power supplies, and hot-swappable components ensures maximum uptime for mission-critical applications. Whether deployed as a standalone switch or as part of a large Virtual Chassis configuration, the EX4300-48P delivers the performance, reliability, and scalability that modern networks demand.