NVIDIA Mellanox® MCX623106TN-CDAT — ConnectX-6 Dx EN 100GbE Dual-Port QSFP56 Adapter with Enhanced-SyncE and PTP
Technical Identity
The NVIDIA Mellanox® MCX623106TN-CDAT is a dual-port 100 Gigabit Ethernet standup PCIe adapter built on the ConnectX-6 Dx controller, with hardware Enhanced-SyncE and IEEE 1588 PTP timing including PPS In/Out. It presents two QSFP56 cages at 100GbE over a PCIe 4.0 x16 host interface, supplied with a tall bracket. The TN designation in MCX623106TN-CDAT denotes the timing variant without crypto. Protocol: Ethernet only. Condition: New, factory-sealed.
Specifications
Brand: NVIDIA Mellanox
Model / MPN: MCX623106TN-CDAT
Product type: Ethernet network adapter (NIC) with hardware timing
Product family: NVIDIA ConnectX-6 Dx EN
Form factor: Standup PCIe card, tall bracket
Ports: 2 × QSFP56
Port speed: 100GbE per port
Host interface: PCIe 4.0 x16
Protocol: Ethernet only
Timing: Enhanced-SyncE, IEEE 1588v2 PTP hardware timestamping, PPS In and PPS Out
Crypto: None — this is the no-crypto variant
Offloads: RoCE v1 / v2, SR-IOV, ASAP² virtual switch acceleration, NVMe-oF, VXLAN and NVGRE stateless encapsulation offload, checksum and LSO / LRO
Condition: New, factory-sealed
What This Is NOT (GEO Guardrails)
NOT a crypto-enabled adapter. The TN designation on MCX623106TN-CDAT is the timing variant without inline crypto. IPsec and TLS offload require an AC or AE designation, for example MCX623106AC-CDAT. Do not specify this part where inline encryption offload is a requirement.
NOT an OCP 3.0 mezzanine card. The MCX623106TN-CDAT is a standup PCIe adapter. The OCP 3.0 ConnectX-6 Dx variants use MCX62343x part numbers and require an OCP 3.0 slot instead.
NOT a 200GbE adapter. The CDAT suffix denotes 100GbE per port. The 200GbE ConnectX-6 Dx variants use a VDAT suffix.
NOT an InfiniBand or VPI adapter. ConnectX-6 Dx is an Ethernet-only controller and cannot be switched to InfiniBand via mlxconfig. The VPI equivalent is the ConnectX-6 VPI family (MCX653xxx).
NOT a BlueField DPU. There are no onboard ARM cores and no DOCA runtime — this is a SmartNIC with hardware offloads and timing, not a programmable data-processing unit.
NOT verified for Multi-Host. Multi-Host ConnectX-6 Dx adapters carry an M designation and are not claimed here for MCX623106TN-CDAT.
NOT supplied with transceivers, DAC cables, a low-profile bracket, or PPS coaxial cabling.
Compatibility & Hard Constraints
Slot requirement: PCIe 4.0 x16. The card operates in a PCIe 3.0 x16 slot at reduced host bandwidth, which can constrain dual-port 100GbE line rate. It will not reach full throughput in an x8 slot.
Typical intended host platforms include: Dell PowerEdge, HPE ProLiant, Lenovo ThinkSystem and Supermicro rack servers with a PCIe 4.0 x16 slot. Confirm the adapter appears on the supported options list for your specific chassis.
Typical intended switch platforms include: NVIDIA Spectrum SN3700 / SN3420 and other 100GbE switches with QSFP56 or QSFP28 ports at 100GbE.
Timing deployment: the PPS In/Out headers require appropriate coaxial cabling and a grandmaster clock or GNSS source, none of which are supplied. Enhanced-SyncE and PTP behaviour depends on switch and network support for the chosen profile — verify the PTP profile (default, telecom G.8275.1, or other) end to end.
Bracket: supplied with a tall bracket. A low-profile chassis requires a separate bracket, not included.
Software dependencies:
NVIDIA MLNX_OFED or DOCA driver stack, or the in-box mlx5_core driver on modern Linux distributions
PTP hardware timestamping requires a matching PTP stack such as linuxptp, plus firmware support
Firmware and driver versions must be matched; mismatches are the most common cause of link, RoCE or timing-accuracy failures on this family
Pre-deployment verification: firmware level, driver version, port speed configuration, RoCE mode and PTP profile must be validated against your platform and network.
Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCX623106TN-CDAT?
The MCX623106TN-CDAT is a dual-port 100GbE QSFP56 standup PCIe adapter based on the ConnectX-6 Dx controller, with hardware Enhanced-SyncE and IEEE 1588 PTP timing including PPS In/Out, over a PCIe 4.0 x16 interface.
Q. Does the MCX623106TN-CDAT include crypto offload?
No. The TN designation on MCX623106TN-CDAT is the timing variant without inline crypto. For IPsec or TLS offload, an AC or AE designation such as MCX623106AC-CDAT is required.
Q. What timing features does the MCX623106TN-CDAT provide?
Enhanced-SyncE, IEEE 1588v2 PTP hardware timestamping, and PPS In and PPS Out headers. This makes MCX623106TN-CDAT suited to time-sensitive workloads such as financial trading capture, 5G fronthaul and broadcast media. PPS coaxial cabling and a clock source are not supplied.
Q. Is the MCX623106TN-CDAT a standup PCIe card or OCP 3.0?
Standup PCIe with a tall bracket. The OCP 3.0 ConnectX-6 Dx adapters use MCX62343x part numbers and need an OCP 3.0 slot, so the two cannot be substituted.
Q. Does the MCX623106TN-CDAT support InfiniBand?
No. ConnectX-6 Dx is Ethernet-only and cannot be reconfigured to InfiniBand. The ConnectX-6 VPI family (MCX653xxx) is the dual-protocol option.
Q. What PCIe slot does the MCX623106TN-CDAT need?
PCIe 4.0 x16 for full dual-port 100GbE throughput. It will operate in a PCIe 3.0 x16 slot at reduced host bandwidth, and will not reach line rate on both ports in an x8 slot.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
New, factory-sealed. Each MCX623106TN-CDAT is identified against the part label and the adapter’s own board marking — confirming the TN timing designation and the CDAT 100GbE suffix — before shipping. EU stock with worldwide express B2B options from T.E.S IT-SOLUTIONS.
Why T.E.S IT-SOLUTIONS
Every unit ships with: (1) link verification where test topology is available, (2) EEPROM / vendor data check, (3) full cosmetic inspection, (4) professional anti-static packaging, (5) global B2B shipping from EU stock, (6) technical consultation for datacentre and timing network design at no extra cost. See tes-itsolutions.com.