Mellanox Technologies MCX4131A-BCAT, User Manual

Page: 15 / 72

Interfaces
Rev 1.9 15 Mellanox Technologies
2 Interfaces
Each adapter card includes the following interfaces:
• “Ethernet QSFP28 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 QSFP28 Interface
The network ports of the ConnectX®-4 Lx adapter cards are compliant with the IEEE 802.3
Ethernet standards listed in
Table 4, “Features,” on page 13 . Ethernet traffic is transmitted
through the cards' QSFP28 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 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 is one bi-color I/O LED per port. For LEDs specifications, please refer to
Section 7.4,
“Adapter LEDs Operations,” on page 59
.