 What is single-pair Ethernet, SP, E? In May 1973 while working at Xerox PARC, Bob Metcalf introduced the concept of Ethernet. Following this, IEEE turned the Ethernet concept into a global standard in 1983, with the release of IEEE standard 802.3A, this supported 10 megabits of data transmission over a coaxial cable. The advancement of Ethernet took another progressive step in 1990 by developing IEEE standard 802.3I, this was built to support the 10 base T application, providing 10 megabits of data transmission over twisted-pair cabling. Since then, the evolution of Ethernet has grown rapidly, quickly moving on from coaxial to twisted-pair copper cabling. This change saw an increase of transmission speeds and reduced costs. To begin with, only two twisted pairs were used, but this soon evolved to four pairs to achieve higher data rates. Now Ethernet is one of the most commonly used protocols for transmitting data between electronic devices. So, what is a single-pair Ethernet, SP, E? What is SP, E? Traditional Ethernet cables from the LAN sector or industrial Ethernet cables use two or four pairs of wires depending on the transmission rate. Single-pair Ethernet cables only contain one twisted-pair, single-pair. Single-twisted-pair cabling was first used in the 1870s, instead of having two straight wires next to each other, the conductors were twisted together to improve the electrical performance. The twisting of the conductors resulted in the cancellation of unwanted electrical noise from nearby pairs or other sources. In the 1870s, single-twisted-pair cabling was used to interconnect telephones. Centuries later, the single-twisted-pair cabling is still in use. The use of this cable is now commonly found in building automation, industrial, and automotive applications. SP, E offers additional advantages in comparison to the traditional cable. SP, E advantages. 1. Thinner bending radii. 2. Smaller cables. Saves material and costs. Great for weight and space-saving designs. 3. Transmission rates of up to 1 gigabit on a single pair. 4. SP, E cable design enables much faster and easier installation, reducing errors in assembly. 5. Single-pair Ethernet uses PODL to supply terminal devices with up to 50 watts via the data line. 6. Lower caloric load, less smoke development. SP, E power delivery. To enhance its usefulness, IEEE developed the ability to transmit power and data over the same twisted pair. Power transmission over 4-pair Ethernet cabling is commonly called power over Ethernet, PoE. Power transmission for SP, E cabling is referred to as power over data lines, PODL. This standard specifies multiple classes of powered devices delivering between 0.5 and 52 watts of power. It's important to realize, although, PODL technology is not compatible with the existing 2 and 4-pair PoE equipment. It has the same advantages as PoE as it provides for centralized power control and backup power. SP, E cables explained. Single-pair Ethernet cables are built to support maximum frequency that corresponds with one or more IEEE applications. Additionally, there are also separate standards for patch cables and horizontal cables. Although it's possible to manufacture patch cords from horizontal cables, patch cables generally employ stranded conductors instead of solid ones. Thus, offering increased flexibility at the expense of diminished electrical performance over long lengths. SP, E connectors explained. The interface is discussed in the IEC 63171 standards for connector types 1-6 are open sourced, allowing any manufacturer to make connectors with the interfaces. As a result, this will increase the likelihood of broad industry adoption. Manufacturers maintain the common interface. However, they have innovative freedom. They can implement proprietary features in other areas of the connector design. For further assistance or a free survey, please email or call on the details below, and click like and subscribe if you have enjoyed this video.