The growing importance of cloud computing along with the increasing utilization of unified data/storage connectivity and the advent of server virtualization have elevated the popularity of 10Gbps Ethernet.There are several connectivity options are available for 10Gbps Ethernet, both over optical fiber and copper cables.
10GBase-T Technology Revisited article tells that the lack of economical cabling options for 10G Ethernet beyond a single or adjacent rack has led to the popularity of Top-of-Rack (ToR) architectures, in which a stack of rack mounted servers are connected with short cables to a fixed configuration switch in close proximity — typically on top of the server rack.
10GBase-T has promise to change that. 10GBase-T is the fourth generation of IEEE standardized Base-T technologies which all use RJ45 connectors and unshielded twisted pair cabling to provide 10Mbps, 100Mbps, 1Gbps, and 10Gbps data transmission, while being backward-compatible with prior generations.
10GBase-T is arguably the most flexible, economical, backward-compatible, and user-friendly connectivity option available. 10GBase-T allows you to use the existing structured cabling infrastructure and allows cable to reach to the full 100-meter length permitted by structured cabling rules. When compared to other 10Gbps connectivity solutions, one of the most important advantages of 10GBase-T is the ability to communicate and inter-operate with legacy, often-slower Base-T systems.
IEEE 802.3an, 10-Gigabit Ethernet over twisted pair standard, also known as 10GBase-T, was ratified at 2006. Unfortunately this has not led to an immediate proliferation of compliant switches and servers in data centers. However, steady advances in semiconductor lithography, and sophisticated algorithms intended to increase electromagnetic interference (EMI) immunity and lower operating power, will make it more practical. For years 10GBase-T has been considered to be very power hungry and expensive. The reason for this has been the complexity of the signal processing that is needed. The 10GBase-T transceiver uses full duplex transmission with echo cancellation on each of the four twisted pairs available in standard Ethernet cables; thereby transmitting an effective 2.5Gbps on each pair.
10GBase-T Technology Revisited article will explore the basic operation of a 10GBase-T transceiver and the inherent advantages of 10GBase-T technology as compared to alternatives, such as optical fiber and coaxial copper.
One of the arguments against 10GBase-T has been power dissipation, but this perspective is rooted mostly in early implementations of the technology. Recent advances in semiconductor lithography have allowed 10GBase-T transceivers to enjoy a dramatic reduction in the power they dissipate during normal operation. From a per-port power of over 6W just a few years to typical Active power dissipation of 1.5W. When utilizing the EEE power saving algorithm with typical computer data patterns for 30-meter reach, newest ICs will dissipate only 750mW.