What is a 2.5G Base-T port ?

In computer networking, Gigabit Ethernet (GbE or 1 GigE) is the term applied to transmitting Ethernet frames at a rate of a gigabit per second (1 billion bits per second). 

1000BASE-T (also known as IEEE 802.3ab) is a standard for Gigabit Ethernet over copper wiring.

Each 1000BASE-T network segment is recommended to be a maximum length of 100 meters (330 feet), and must use Category 5 cable or better (including Cat 5e and Cat 6).

The 1 GE BASE-T standard connecting at 1000 Mbps is widely used today. But if you want more bandwidth from a single port, your options are: Combine two or more 1 GE connections via Link Aggregation, or upgrade to a 2.5GE connection.

 IEEE 802.3bz, NBASE-T is standards for Ethernet over twisted pair at speeds of 2.5 Gbit/s. It use the same cabling as the ubiquitous Gigabit Ethernet, yet offer higher speeds. 2.5GBASE-T can automatically negotiate to operate at speeds of 100 Mbit/s, 1, 2.5Gbit/s, depending on the quality of the cable and the capabilities of the equipment at the other end of the cable.

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