Mellanox Technologies MCX4411A-ACAN, User Manual, Page: 18 / 79

Interfaces
Rev 2.5 18 Mellanox Technologies
2 Interfaces
Each adapter card includes the following interfaces:
• “Ethernet SFP28 Interface”
• “PCI Express Interface”
• “LEDs Interface”
The adapter cards include special circuits to protect from ESD shocks to the card/server when
plugging copper cables.
2.1 Ethernet SFP28 Interface
The network ports of the ConnectX®-4 Lx adapter cards are compliant with the IEEE 802.3
Ethernet standards listed in
Table 5, “Features,” on page 16 .The SFP28 port has one Tx/Rx pair
of SerDes. Ethernet traffic is transmitted through the cards' SFP28 connectors.
2.2 PCI Express Interface
The ConnectX®-4 Lx adapter cards support PCI Express 3.0 (1.1 and 2.0 compatible) through an
x8connector. The device can be either a master initiating the PCI Express bus operations or a
slave responding to PCI bus operations. The following lists PCIe FCI B2B connector interface
features:
• PCIe Gen 3.0 compliant, 1.1 and 2.0 compatible
• 2.5, 5.0, or 8.0GT/s link rate x8
• Auto-negotiates to x8, x4, x2, or x1
• Support for MSI/MSI-X mechanisms
2.3 LEDs Interface
There are two I/O LEDs per port. For LEDs specifications, please refer to
Section 7.6,
“Adapter LEDs Operations,” on page 64
.