Supports PCI Express 2.1. Supports 2 high-performance 2.5-Gigabit LAN ports. Autonegotiation with Extended Next Page Feature (XNP) Compatible with NBASE- Alliance PHY specification. Supports swap//skew correction, crossover detection and automatic correction Supports 1- 2.5/5Gbps PCI Express bus. Support hardware ECC (error correcting code) function. Support hardware (cyclic redundancy check) function Transmit/receive on-chip buffer support Supports PCI (Message Signaled Interrupt) and -X Support power-down/power-down power saving/PHY disable mode Supports ECMA-393 ProxZzzy standard for hibernating hosts Supports LTR (Latency Tolerance Reporting) Supports PCIe L1 substates L1.1 and L1.2 Compatible with IEEE 802.3, IEEE 802.3u, IEEE 802. Support IEEE 1588v1, IEEE 1588v2, IEEE 802.1AS time synchronization Supports full-duplex flow control (IEEE 802.3x) Supports jumbo frames up to 16K bytes Supports standard and low-profile chassis Bus: 1- 2.5/5Gbps PCI Express Chip: RTL8125B Ports: 2 x RJ45 Industry standard Supports IEEE 802.1Qav credit-based shaping algorithm Supports IEEE 802.1P Layer 2 priority encoding Supports IEEE 802.1Q VLAN tagging Supports IEEE 802.1ad dual VLAN Supports IEEE 802.3az (Energy Efficient Ethernet) Support IEEE 802.3bz (2.5GBase-T) Transmission rate 2.5Gbps Usage environment Working temperature: 0 to 55 Storage temperature: -40 to 70 Working humidity: 10% to 90%RH non-condensing Storage humidity: 5% to 90%RH non-condensing Operating Systems for for Linux, for OS and DOS color: As shown Material: PCB Package Contents: 1 set of Gigabit NIC loose parts Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.