Dell EMC S4248FB-ON / S4248FBL-ON 40 × 10GbE SFP+ 2 × QSFP+ 6 × 100GbE QSFP28 L3 Data Centre Switch, 2 × AC PSU, 5 Hot-Swappable Fans

Dell EMC S4248FB-ON and S4248FBL-ON are high-density 1U Top-of-Rack open networking switches built for next-generation data centre environments. It features 40 × 10GbE SFP+ access ports, 2 × 40GbE QSFP+, and 6 × 100GbE QSFP28 uplinks for flexible aggregation and core connectivity. With dual hot-swappable AC power supplies, five fan modules, and selectable airflow (I/O Panel to PSU or reverse), the S4248FB-ON ensures high availability and efficient cooling. Designed for open networking, it supports ONIE for zero-touch installation of third-party network operating systems such as Dell SmartFabric OS10, SONiC, or Cumulus Linux, delivering advanced automation and programmability for cloud and enterprise deployments.

KEY FEATURES:

• Total Ports: 40 x 1/10GbE SFP+, 2 x 40GbE QSFP+, 6 x 100GbE QSFP28
• Switching Capacity: 1.6Tbps (full-duplex) / 800Gbps (half-duplex)
• Forwarding Rate: 720 Mppss
• CPU: Multi-core Intel x86
• System Memory: S4248FB-ON: 8GB / S4248FBL-ON: 32GB
• Flash Storage: S4248FB-ON: 16GB mSATA SSD; S4248FBL-ON: 64GB mSATA SSD
• Packet Buffer: 6GB
• MAC Address Table: S4248FB-ON: up to 400K; S4248FBL-ON: up to 700K
• VLANs: Up to 4,000
• Latency: 1.9 - 10.0 microseconds (µs)
• Form Factor: 1U Fixed Rack Mount
• Airflow: I/O Panel → PSU or PSU → I/O Panel
• Fans: 5 × Hot-swappable fan modules with N+1 redundancy
• Power Supply: Dual hot-swappable AC or DC PSUs
• Power Consumption: S4248FB-ON: Typical 150W/Max 420W; S4248FBL-ON: Typical 180W/Max 470W
• Dimensions: 1.72" (H) x 17.1" (W) x 18.2" (D) | 4.4cm x 43.4cm x 46.2cm
• Weight: 9.98kg (22 lbs) 
• Operating Temp: 0°C to 45°C
• Supported OS: Dell OS10, Cumulus Linux, ONIE open install
• Management Ports: 1 x RJ-45 console/management port (RS232)
• Mounting: Standard 19-inch rackmount

TECHNICAL SPECIFICATION:

HARDWARE:

PERFORMANCE:

SECURITY:

MANAGEMENT:

PHYSICAL & ENVIRONMENTAL:

ADVANCED FEATURES: 

Open Networking Ready:

The Dell EMC S4248FB-ON and S4248FBL-ON is fully Open Networking ready, supporting ONIE (Open Network Install Environment) for zero-touch deployment of third-party network operating systems including Dell SmartFabric OS10, SONiC, Cumulus Linux, and IP Infusion OcNOS. This allows full flexibility for software-defined networking (SDN) and automation in modern data centres, enabling rapid provisioning and scaling without vendor lock-in. The switch supports multi-vendor network environments, ensuring seamless integration with existing network infrastructures. Automated rollback and dual-image management enhance operational reliability, allowing safe upgrades with minimal downtime. Additionally, the switch provides programmable interfaces for DevOps workflows, enabling network-as-code practices and integration with cloud orchestration platforms. Open Networking readiness ensures future-proof deployment across evolving IT architectures, while maintaining compatibility with both traditional and modern networking protocols.

High Availability & Redundancy:

Designed for high availability, the S4248FB-ON and S4248FBL-ON features dual hot-swappable AC or DC power supplies for uninterrupted operation and five hot-swappable variable-speed fans with N+1 redundancy for reliable cooling under peak loads. The airflow direction is configurable as I/O Panel → PSU (Front-to-Back) or PSU → I/O Panel (Back-to-Front), allowing alignment with data centre environmental requirements. Hardware health monitoring enables predictive replacement of failing components, reducing maintenance risks. Redundant design supports zero downtime during upgrades or maintenance, while fans and PSUs include smart monitoring for automatic alerts. The switch also offers power efficiency features that optimize consumption based on port activity, reducing operational costs. Built-in diagnostics continuously monitor hardware integrity, ensuring consistent network availability in mission-critical deployments.

Flexible Port & Uplink Configuration:

The switch offers 40 × 10GbE SFP+ access ports for server connectivity, complemented by 2 × 40GbE QSFP+ and 6 × 100GbE QSFP28 uplinks for aggregation and core connectivity. Mixed-speed port support allows hybrid deployment scenarios, while breakout capabilities on QSFP28 ports provide flexible bandwidth allocation. Multi-chassis link aggregation simplifies scaling across multiple switches, while uplinks provide sufficient bandwidth for storage, virtualization, and high-performance compute environments. Advanced traffic balancing ensures efficient use of all uplinks, reducing bottlenecks and improving network efficiency. Each port supports full line-rate performance, low latency, and deep packet buffering for consistent throughput. The switch also provides per-port monitoring and telemetry to track utilization, errors, and traffic patterns in real time, supporting predictive network management.

Advanced Routing & Network Virtualization:

The S4248FB-ON and S4248FBL-ON supports Static Routing, OSPF, BGP, and VRF-lite, enabling deployment in complex enterprise and cloud networks. Overlay networks with VXLAN and NVGRE provide multi-tenant segmentation and efficient east-west traffic handling. Multicast support using IGMP Snooping, PIM-SM, and PIM-SSM optimizes delivery of broadcast and group traffic. Segment routing, route summarization, and advanced policy-based routing allow efficient traffic engineering for large-scale environments. These features support both traditional Layer 3 data centre architectures and modern multi-tenant cloud environments. The switch also enables seamless integration with network virtualization overlays, supporting hybrid cloud deployments while maintaining high performance and low latency.

Traffic & Congestion Management:

Dynamic buffer allocation and deep packet buffering ensure consistent high performance under heavy workloads. Quality of Service (QoS) scheduling, Weighted Random Early Detection (WRED), and eight egress queues per port provide fine-grained traffic prioritization. Priority Flow Control (IEEE 802.1Qbb) and DCBX/ECN reduce congestion in converged networks, ensuring lossless operation for latency-sensitive applications such as storage or HPC. Per-port rate limiting and traffic policing enable secure multi-tenant environments, while traffic mirroring and monitoring facilitate detailed network analytics and troubleshooting. The switch can handle bursts and high-volume east-west traffic efficiently, while supporting congestion avoidance policies across uplinks and access ports. These advanced mechanisms ensure predictable performance in large-scale and mission-critical deployments.

Automation & Programmability:

The S4248FB-ON and S4248FBL-ON supports full automation and programmability through REST APIs, Python SDK, Ansible, Puppet, and Chef. Zero-touch provisioning via ONIE allows rapid deployment of multiple switches in large data centres. Configuration management is simplified with NETCONF, RESTCONF, and JSON-RPC interfaces, while automated monitoring and alerting provide predictive insights for maintenance. Integration with CI/CD pipelines supports network-as-code workflows and DevOps practices. The switch also supports telemetry streaming and event logging, which can be integrated into network analytics platforms for predictive monitoring. Automation reduces operational overhead, accelerates deployment, and ensures configuration consistency across multi-site deployments.

Security & Compliance:

Security is comprehensive with Layer 2/3/4 ACLs, 802.1X authentication, RADIUS, TACACS+, SSH, and HTTPS for secure management access. Port security, DHCP Snooping, and IP Source Guard prevent unauthorized devices, while DoS protection and control-plane policing ensure switch stability. Tenant isolation through private VLANs and VRF-lite segmentation supports multi-tenant deployments. The switch is compliant with regulatory standards such as RoHS, WEEE, REACH, and ENERGY STAR. Advanced logging and audit trails enhance visibility and security monitoring, while secure firmware and OS upgrade mechanisms protect against malicious or accidental configuration changes. These features make the S4248FB-ON suitable for enterprise, government, and cloud data centre environments with stringent security requirements.

Monitoring & Telemetry:

Real-time SNMP, sFlow, RMON, Syslog, telemetry, and event logging provide complete network visibility. Onboard diagnostics, loopback testing, and environmental sensors enable efficient troubleshooting and proactive maintenance. Telemetry data can be streamed to analytics platforms for predictive insights, while per-port monitoring tracks traffic, errors, and environmental metrics. Integration with cloud-based monitoring and orchestration tools allows centralised management across multiple sites. Historical performance data and real-time alerts support capacity planning and automated fault detection, improving overall operational efficiency.

Cloud & Data Centre Integration:

The switch integrates with OpenStack, VMware NSX, and Kubernetes CNI, making it ideal for modern cloud deployments. Its high-density 1U form factor is optimized for top-of-rack deployment in enterprise and hyperscale data centres. VXLAN and overlay network support provide multi-tenant network segmentation, while the architecture supports virtualization, storage, and HPC workloads. It can seamlessly integrate with software-defined storage and compute clusters, enabling scalable and agile cloud operations. Additionally, the switch supports hybrid deployments, connecting on-premises infrastructure with public cloud resources securely and efficiently.

Firmware & Software Management:

Dual-image support allows non-disruptive OS upgrades, reducing operational downtime. Firmware updates can be applied via USB, TFTP, FTP, SCP, or HTTP. Secure boot and image verification ensure only trusted software is executed, while automated rollback protects against faulty firmware deployments. Scheduled software updates allow planned maintenance without affecting production traffic. Multi-device provisioning enables rapid configuration and deployment of multiple switches, which is critical for large-scale data centre operations. Firmware management also includes logging and reporting for compliance and auditing purposes.

Performance & Scalability:

The S4248FB-ON and S4248FBL-ON delivers up to 4 Tbps switching capacity with 1.48 Bpps forwarding rate, supporting large-scale enterprise and cloud deployments. It has a MAC address table of 512K entries and supports up to 4,000 VLANs for high-density top-of-rack deployments. Low latency (<600 ns) ensures optimal east-west traffic performance, critical for storage and HPC environments. Multi-chassis deployment support allows seamless network scaling. The switch is optimized for high-density server farms, virtualization clusters, and multi-tenant cloud workloads, providing reliable performance even under heavy traffic conditions. Advanced flow control and traffic management ensure predictable performance and operational consistency across all ports.

ORDERING INFORMATION:

WARRANTY & SUPPORT:

Manufacturers are responsible for warranties, which are based on the purchase date and validity. We make sure the products we sell are delivered on time and in their original condition at Grabnpay. Whether it's physical damage or operational issues, our team will help you find a solution. We help you install, configure, and manage your devices. We'll help you file a warranty claim and guide you every step of the way.

All listed prices reflect standard market rates. Final commercial terms, including volume-based discounts, will be provided based on purchase volume, MOQ, and other applicable criteria. For more information about switches & other accessories, contact our technical support team.