WT35C - Dell PowerSwitch Z9100-ON 32x100GbE QSFP28 Switch

Dell PowerSwitch Z9100-ON high-density data center switch with 32 fixed 100GbE QSFP28 ports plus 2 SFP+ uplinks and redundant hot-swap PSUs.

The WT35C is Dell's manufacturer part number for the PowerSwitch (Networking) Z9100-ON, a 1U fixed data center switch built for high-density, high-performance 10/25/40/50/100GbE connectivity. It uses a non-blocking switching architecture to deliver line-rate Layer 2 and Layer 3 forwarding, making it suitable for data center core, spine, and leaf deployments. The unit ships in a 32x100GbE QSFP28 configuration plus 2 fixed SFP+ ports, with dual redundant hot-swappable 750W AC power supplies and standard (I/O-to-PSU) airflow. It runs Dell's Network Operating System (OS9 Enterprise by default, with OS10 available) and supports advanced Layer 2/3 features, QoS, and Data Center Bridging (DCB) capabilities such as PFC, DCBX and ETS, making it ideal for converged Ethernet and software-defined data center environments.

• Manufacturer: Dell Technologies
• Manufacturer Part Number: WT35C (also referenced as 0WT35C)
• Product Line: Dell PowerSwitch / Networking Z-Series
• Product Model: Z9100-ON
• Product Type: Layer 3 managed Ethernet data center switch
• Fixed Ports: 32 x 100GbE QSFP28 ports (configurable to 64x50GbE, 32x40GbE, 128x25GbE, or 128+2x10GbE)
• Uplink/Management Ports: 2 x fixed 1/10GbE SFP+ ports
• Switching Capacity: Up to 6.4 Tbps I/O bandwidth (full duplex)
• Forwarding Rate: 4400 Mpps (full duplex)
• Latency: Below 500ns
• MAC Address Table Size: 136,000 entries
• Switching Architecture: Non-blocking, line-rate L2/L3 forwarding
• Power Supply: 2 x redundant, hot-swappable 750W AC PSUs, 100–240 VAC 50/60Hz
• Power Consumption: Max 605W; Typical 195W
• Airflow: Standard (I/O to PSU); reverse airflow variants also available
• PoE: Not applicable / not supported
• Operating System: Dell OS9 Enterprise (default); Dell OS10 Enterprise also supported
• Management Ports: 1 RJ45 console/management port, 1 10/100/1000BASE-T management port, 1 USB 2.0 Type-A storage port, 1 micro-USB Type-B console port
• Security Features: 802.1X with RADIUS, EAP, AES cipher (SNMP), SSHv2, IPSec (AH/ESP)
• Data Center Bridging: Priority-based Flow Control (PFC), DCBX, Enhanced Transmission Selection (ETS)
• Dimensions: 1RU, 1.72"h x 17.1"w x 18"d
• Weight: 22 lbs (9.98 kg)
• Transceivers: Not included
• Included Accessories: 1 x rail kit, 1 x console cable
• Condition (Market Availability): Predominantly sold as certified refurbished by IT resellers
• Warranty: Typically 90 days to 3 years depending on reseller (varies by vendor)

• 32 fixed 100GbE QSFP28 ports for high-density data center connectivity
• 2 additional fixed 1/10GbE SFP+ ports for management or uplink
• Non-blocking switching architecture delivering line-rate L2/L3 forwarding
• Up to 6.4 Tbps of switching I/O bandwidth at full duplex
• 4400 Mpps forwarding rate for high-throughput workloads
• Sub-500ns latency suited to latency-sensitive applications
• Dual redundant, hot-swappable 750W AC power supplies for high availability
• Supports Dell OS9 Enterprise and OS10 open networking operating systems
• Data Center Bridging support (PFC, DCBX, ETS) for converged Ethernet
• Flexible port configuration: 32x100GbE, 64x50GbE, 32x40GbE, or 128x25/10GbE
• Compact 1RU form factor to conserve valuable rack space
• Advanced security including 802.1X, SSHv2, and IPSec support

Purpose-built for high-performance data center core, spine, and leaf network deployments.

• Data center core or spine switching for 100GbE fabrics
• High-performance computing (HPC) cluster interconnects
• Enterprise data center consolidation and migration to 100Gbps
• Software-defined data center (SDDC) network infrastructure
• Storage area network (SAN) and converged Ethernet environments
• Leaf-spine network architectures requiring high port density
• Service provider and cloud infrastructure backbone connectivity

• High port density in a compact 1U footprint
• Line-rate L2/L3 performance for demanding workloads
• Redundant PSUs improve uptime and reliability
• Flexible port speeds ease migration to 100GbE
• Low latency supports time-sensitive applications
• Open networking OS options add deployment flexibility

• Form Factor: 1U rack-mountable
• Dimensions: 1.72" (H) x 17.1" (W) x 18" (D)
• Weight: 22 lbs (9.98 kg)
• Airflow Direction: Standard (I/O to PSU); reverse airflow variant also produced

Per available documentation, the Dell WT35C (Z9100-ON) is validated for use with:

• Dell OS9 Enterprise network operating system
• Dell OS10 Enterprise open networking operating system
• QSFP28 100GbE optical/copper transceivers and cables
• QSFP+ 40GbE/50GbE transceivers (in alternate port configurations)
• SFP28 25GbE transceivers (in alternate port configurations)
• SFP+ 10GbE/1GbE transceivers for the two auxiliary ports
• Dell PowerEdge servers in converged data center fabrics
• Dell rail kit and rack mounting accessories
• Standard 19-inch equipment racks

Note: Exact transceiver and cable compatibility should be verified against the current Dell Networking Z9100-ON compatibility matrix, as supported optics can vary by OS version.

• Dell PowerSwitch Z9100-ON switch unit (WT35C)
• 1 x rail/mounting kit
• 1 x console cable
• 2 x redundant hot-swap 750W AC power supply units

Q: What product does the Dell part number WT35C refer to?

A: WT35C is Dell's manufacturer part number for the PowerSwitch (Networking) Z9100-ON, a 32x100GbE QSFP28 plus 2x SFP+ data center switch, as confirmed by multiple Dell hardware resellers.

Q: How many ports does the WT35C switch have?

A: It has 32 fixed 100GbE QSFP28 ports and 2 fixed 1/10GbE SFP+ ports, though the underlying Z9100-ON platform can also be configured for 64x50GbE, 32x40GbE, 128x25GbE, or 128+2x10GbE.

Q: What is the switching capacity of the WT35C (Z9100-ON)?

A: According to Dell's official spec sheet and reseller documentation, the switch delivers up to 6.4 Tbps of switching I/O bandwidth at full duplex.

Q: What operating system does the WT35C run?

A: Units are typically shipped with Dell OS9 Enterprise by default, though Dell OS10 Enterprise open networking software is also supported on this platform.

Q: Does the WT35C include transceivers or a rail kit?

A: Reseller listings indicate transceivers are not included, but a rail kit and console cable are typically bundled with the switch.

Q: What power supplies does the WT35C use?

A: The switch uses two redundant, hot-swappable 750W AC power supply units, supporting 100–240 VAC at 50/60 Hz input.

Q: Is the WT35C / Z9100-ON still available new from Dell?

A: The Z9100-ON series is an older platform now primarily found through refurbished and used IT hardware resellers rather than as a new Dell order, based on current market listings.

Q: What is the forwarding rate and latency of this switch?

A: Third-party technical listings report a forwarding rate of 4400 Mpps in full duplex mode and switch latency below 500 nanoseconds.