The Dell EMC PowerSwitch S4048-ON is an ultra-low-latency 10/40GbE top-of-rack (ToR) switch engineered for high-performance data center and computing environments. Built on a non-blocking switching architecture, the S4048-ON delivers 1.44Tbps full-duplex switching capacity with sub-650ns latency, enabling line-rate L2 and L3 forwarding across all ports simultaneously. The compact 1RU form factor provides 48 dual-speed 1/10GbE SFP+ ports plus six 40GbE QSFP+ uplinks (expandable to 72 10GbE ports with breakout cables), maximizing rack density while simplifying migration to 40Gbps core connectivity. With 1080 Mpps forwarding capacity, 12MB packet buffer memory, 4GB CPU memory, and support for advanced features including 4K VLANs, 128 link aggregation groups, 511 VRF-Lite instances, and 64 MSTP instances, the S4048-ON is ideal for data center spine/aggregation layers, high-performance computing clusters, and enterprise campus networks requiring deterministic, low-latency east-west traffic patterns.
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Featuring
Manufacturer part #
S4048-ON
Brand
Dell
Condition
Refurbished
Model
S4048-ON
ARP Table
128K entries
CPU Memory
4GB
IPv6 Hosts
64K
IPv4 Routes
128K
IPv6 Routes
64K
PoE Support
No
QoS Entries
Default 768, scalable to 2.5K
Product Line
Compatible systems
The Dell S4048-ON is a standalone top-of-rack switch compatible with standard 19-inch data center racks and 100-240V AC power infrastructure. Requires SFP+ and QSFP+ transceivers (sold separately) for port connectivity. Runs Dell OS9 with ONIE support for multi-vendor OS flexibility. Integrates with Dell EMC networking ecosystem and third-party data center management platforms via REST API and SNMP.
Dell EMC PowerSwitch S-Series
Model: S4048-ON
Form factor: 1RU top-of-rack switch
Generation: S-Series
Standalone switch; integrates with Dell EMC networking ecosystem and third-party data center infrastructure
Generic Data Center Infrastructure
Model: Any standard 19-inch rack
Form factor: 1RU form factor
Generation: Standard
Compatible with standard 19-inch equipment racks; requires 100-240V AC power supply
Best for
Data Center Top-of-Rack (ToR)
Primary deployment as high-density access layer switch connecting compute servers to aggregation/core network. Non-blocking 1.44Tbps fabric supports full line-rate performance across all 48 10GbE ports simultaneously, ideal for east-west traffic in virtualized environments.
High-Performance Computing (HPC) Clusters
Ultra-low sub-650ns latency enables deterministic, predictable network performance critical for tightly-coupled parallel computing workloads. 1080 Mpps forwarding rate and 12MB packet buffer support bursty MPI communication patterns in scientific computing.
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New, certified-refreshed and OEM stock with guaranteed compatibility, backed by warranty on every part.
2x redundant hot-swappable 460W AC PSUs, N+1 redundancy
Input Voltage
100-240V AC, 50/60Hz
DC Power Support
-40.5V to -60V DC (optional)
Maximum Current Draw
2.344A/1.953A at 100/120V AC, 1.145A/0.954A at 200/240V AC
Maximum Thermal Output
799.64 BTU/h
Maximum Power Consumption
234.35W AC, 800W DC
Typical Power Consumption
153W
Physical Characteristics
Form Factor
1RU (1.73 inches height)
Environmental
Cooling
2x hot-swappable fans included
Airflow Options
Standard (I/O-to-PSU) and Reverse (PSU-to-I/O)
Operating Temperature
0°C to 45°C (32°F to 113°F)
Interface/Ports
Uplink Ports
6x 40GbE QSFP+ (expandable to 24x 10GbE with breakout cables)
Primary Ports
48x 10GbE SFP+ dual-speed (1/10 Gbps)
Management Port
1x RJ45 RS232 console, 1x USB 2.0 Type A, 1x Micro-USB 2.0 Type B
Cloud Infrastructure Aggregation
Six 40GbE QSFP+ uplinks (or 24x 10GbE with breakout cables) provide flexible core connectivity for multi-tenant cloud platforms. Supports 4K VLANs and 511 VRF-Lite instances for tenant isolation and multi-tenancy.
Financial Services & Trading Networks
Sub-650ns latency and non-blocking architecture meet strict latency SLAs for algorithmic trading, real-time analytics, and low-latency market data distribution requiring microsecond-level predictability.
Enterprise Campus & Branch Aggregation
Dual-speed 1/10GbE ports support mixed legacy 1GbE and modern 10GbE endpoints. 128 link aggregation groups enable redundant uplinks and load balancing across multiple core switches for high availability.
Storage Area Network (SAN) Interconnect
High throughput and low latency optimize block-level storage traffic. Supports VXLAN Layer 2 gateway functionality for overlay network connectivity between hypervisor-based and non-virtualized storage infrastructure.
Media & Content Delivery Networks
1.44Tbps capacity and 1080 Mpps forwarding handle sustained high-bandwidth video streaming, content distribution, and media ingest workflows with minimal packet loss and latency.
Frequently asked questions
What switching capacity and latency does the S4048-ON deliver?
The Dell S4048-ON provides 1.44Tbps full-duplex non-blocking switching capacity with sub-650ns latency on 64-byte packets. This enables line-rate L2/L3 forwarding across all 48 10GbE and 6 40GbE ports simultaneously, making it ideal for latency-sensitive data center and HPC deployments requiring deterministic, microsecond-level performance.
How many ports does the S4048-ON have and what speeds are supported?
The S4048-ON features 48 dual-speed 1/10GbE SFP+ ports and six 40GbE QSFP+ uplinks. Each QSFP+ port can also support four 10GbE breakout cables, enabling up to 72 total 10GbE ports with appropriate transceiver configuration. Supports both optical SFP+/QSFP+ transceivers and breakout optics.
What are the power consumption and thermal specifications?
Maximum AC power consumption is 234.35 watts with typical consumption at 153 watts. The switch includes two redundant hot-swappable 460W AC power supplies supporting 100-240V 50/60Hz input. Maximum thermal output is 799.64 BTU/h. Operating temperature range is 0°C to 45°C (32°F to 113°F), suitable for standard data center environments.
What advanced networking features does the S4048-ON support?
The S4048-ON supports 4K Layer 2 VLANs, 128 link aggregation groups (16 links per group), 511 VRF-Lite instances, 64 MSTP instances, and VXLAN Layer 2 gateway functionality. It can learn 160K MAC addresses, support 128K ARP entries, and route 128K IPv4 and 64K IPv6 routes, enabling complex multi-tenant and overlay network deployments.
Is the S4048-ON suitable for high-performance computing (HPC) environments?
Yes, the S4048-ON is optimized for HPC with sub-650ns latency, 1080 Mpps forwarding rate, and 12MB packet buffer memory. These specifications support tightly-coupled parallel computing workloads requiring deterministic, low-latency MPI communication. The non-blocking architecture ensures no head-of-line blocking, critical for HPC cluster interconnects.
What management and operating system options are available?
The S4048-ON runs Dell OS9 (Open Networking) and supports multiple management interfaces including CLI, SNMP, RMON, REST API, and web-based GUI. It includes 1 RJ45 console/management port with RS232 signaling, 1 USB 2.0 Type A port for mass storage, and 1 Micro-USB 2.0 Type B serial console port for out-of-band management.
What is the physical form factor and rack density?
The S4048-ON is a compact 1RU (1.73 inches high) switch, maximizing rack density in standard 19-inch equipment racks. The 1RU form factor with 48 10GbE ports and 6 40GbE uplinks provides industry-leading port density for top-of-rack deployments, conserving valuable data center rack space while delivering enterprise-class performance.
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