Dell PowerSwitch S4128T-ON
The Dell PowerSwitch S4128T-ON is a 1U top-of-rack open networking switch providing 28 10GBASE-T copper ports and two 100GbE QSFP28 uplink ports. Designed for mid-density server racks and storage clusters utilizing standard twisted-pair Cat6a copper cabling, the S4128T-ON provides wire-speed Layer 2 and Layer 3 forwarding and full support for Dell SmartFabric OS10 automation.
Also written as: PowerSwitch S4128T-ON, Dell S4128T-ON, S4128T 1U 10GBASE-T Switch
Specifications
| Brand | Dell |
|---|---|
| Family | PowerSwitch S-Series |
| Form factor | 1U switch |
| Released | Jun 2017 |
| Port configuration | 28x 10GBASE-T RJ45 ports + 2x 100GbE QSFP28 uplink ports |
| Switching capacity | 960 Gbps aggregate throughput (714 Mpps forwarding rate) |
| Operating system | ONIE; supports Dell SmartFabric OS10, Enterprise SONiC, and 3rd-party NOS |
| Airflow options | I/O to PSU (Normal) or PSU to I/O (Reverse) airflow options |
| Power supply | Dual redundant hot-plug power supplies with hot-swappable fans |
Compatible parts
Transceivers
407-BCBI Dell 32Gb Short Wave SFP28 Fibre Channel Optical Transceiver
407-BCBF Dell 25GbE SFP28 SR Optical Transceiver (850nm, 100m MMF)
407-BBOG Dell 16Gb Short Wave SFP+ Fibre Channel Optical Transceiver
Rail kits
770-BCKW Dell ReadyRails II Sliding Rails for 2U PowerEdge Servers (B6)
Works together
How the Dell PowerSwitch S4128T-ON connects to servers, storage and the network: 3 ways, with the parts and products on each path.
iSCSI and NVMe/TCP over Ethernet
Keep the speed the same at all three points: a 25GbE server, a 25GbE switch port and a 25GbE array port. Mixed speeds work but the slowest link sets the pace.
Servers
Dell PowerEdge C4140 1U rack
Dell PowerEdge R440 1U rack
Dell PowerEdge R540 2U rack
Dell PowerEdge R640 1U rack
Dell PowerEdge R740 2U rack
Dell PowerEdge R740xd 2U rack
Adapters for the server
540-BBGN Dell Broadcom 57412 Dual Port 10GbE SFP+ PCIe Adapter
540-BBGO Dell Broadcom 57416 Dual Port 10GBASE-T RJ45 PCIe Adapter
540-BBGP Dell Broadcom 57416 Dual Port 10GBASE-T RJ45 OCP 3.0 Adapter
540-BBGY Dell Broadcom 57414 Dual Port 10/25GbE SFP28 PCIe Low Profile Network Adapter
Storage
Dell Isilon A2000 4U 4-node chassis
Dell Isilon F800 4U 4-node chassis
Dell Isilon H400 4U 4-node chassis
Dell Isilon H500 4U 4-node chassis
Dell Unity 350F 2U rack
Dell Unity 450F 2U rack
Optics
File storage (NFS and SMB)
Front-end ports face the clients; back-end ports (on scale-out systems) connect the nodes to each other and need their own switch pair.
Servers
- Dell PowerEdge C4140 1U rack
- Dell PowerEdge R440 1U rack
- Dell PowerEdge R540 2U rack
- Dell PowerEdge R640 1U rack
- Dell PowerEdge R740 2U rack
- Dell PowerEdge R740xd 2U rack
Adapters for the server
- 540-BBGN Dell Broadcom 57412 Dual Port 10GbE SFP+ PCIe Adapter
- 540-BBGO Dell Broadcom 57416 Dual Port 10GBASE-T RJ45 PCIe Adapter
- 540-BBGP Dell Broadcom 57416 Dual Port 10GBASE-T RJ45 OCP 3.0 Adapter
- 540-BBGY Dell Broadcom 57414 Dual Port 10/25GbE SFP28 PCIe Low Profile Network Adapter
Storage
Dell Isilon A200 4U 4-node chassis- Dell Isilon F800 4U 4-node chassis
- Dell Isilon H400 4U 4-node chassis
- Dell Isilon H500 4U 4-node chassis
- Dell Unity 350F 2U rack
- Dell Unity 450F 2U rack
Optics
Hyperconverged cluster
Plan at least two 25GbE ports per node to two switches; all-NVMe clusters often move to 100GbE.
HCI nodes
Dell VxRail P Series P570F 2U rack (1 node)
Dell VxRail P570 2U rack
Dell VxRail S570 2U rack
Dell VxRail V570 2U rack
Adapters for the server
- 540-BBGN Dell Broadcom 57412 Dual Port 10GbE SFP+ PCIe Adapter
- 540-BBGO Dell Broadcom 57416 Dual Port 10GBASE-T RJ45 PCIe Adapter
- 540-BBGP Dell Broadcom 57416 Dual Port 10GBASE-T RJ45 OCP 3.0 Adapter
- 540-BBGY Dell Broadcom 57414 Dual Port 10/25GbE SFP28 PCIe Low Profile Network Adapter
Optics
Plan and size it
- Draw this setup in the topology planner mrplanb.com
- Add up rack power and space rack-density.com
- iSCSI explained mrplanb.com
- Virtualization storage Ledger: scored storage platforms mrplanb.com
- Network monitoring tools compared mrplanb.com
- Dell E-Lab Navigator (Dell interoperability) dell.com
Check compatibility with Dell
Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that Dell has tested with the Dell PowerSwitch S4128T-ON.
- Compatibility Dell E-Lab Navigator (storage and SAN interoperability) (free vendor sign-in)
- Support Dell Support: drivers, manuals and service tag lookup
Equivalent models from other brands
Buying a used PowerSwitch S4128T-ON: what to check
Confirm power supply fan airflow direction matches data center hot/cold aisle design, test 10GBASE-T link negotiation at 1GbE and 10GbE, and verify ONIE boot loader functionality.
FAQ
Does the S4128T-ON support SmartFabric Services (SFS)?
Yes, SmartFabric Services automate network configuration and multi-switch leaf-spine fabric deployment from vCenter.
Can the 100GbE ports connect to 40GbE uplinks?
Yes, QSFP28 ports accept 40GbE QSFP+ optical transceivers or direct-attach copper cables.
Buying or selling PowerSwitch S4128T-ON?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- Dell PowerSwitch S4100 Series Spec Sheet, checked 2026-10-27