In 2003 the IEEE 802.3ae standard for 10Gbps over fibre was announced, which spawned many variations for transmission over different physical media types such as copper twisted pair, multimode and single mode fibre.
10 Gigabit Ethernet is based on the IEEE 802.3 standard, using the same media access control (MAC) protocol, 802.3 Ethernet frame format and frame size. 10 Gigabit Ethernet only has a full duplex duplex role, just like its predecessors Fast Ethernet and Gigabit Ethernet. Because of this it therefore has no inherent distance limitations which limited the earlier standards, essentially due to collisions.
The 10GBASE-SR and 10GBASE-SW 10 Gigabit media standards are designed for operation over short wavelength multimode fibre, at distances ranging from 2 – 300 metres using an 850 nanometre wavelength. The 10GBASE-SR standard was specifically developed for use over ‘Dark Fibre’ links, whereas the 10GBASE-SW media type was designed with SONET and SDH optical equipment in mind.
Whereas the 10GBASE-SR and 10GBASE-SW standards are for use with multimode fibre, the 10GBASE-LR and 10GBASE-LW 10 Gigabit media standards were developed for use with long wavelength single mode fibre at distances from 2 kilometres to in excess of 100 kilometres using a 1310 nanometre laser. Once again, the first standard was designed for use with Dark Fibre and the second for SONET and SDH optical equipment.
There are numerous other 10 Gigabit Ethernet variations and we will take a look at some of these in later posts.
The evolution of Ethernet is simplifying multiple connections from the desktop, through the wiring cabinet and across core networks, by having a common framing system regardless of the speed. This cuts down on the amount of protocol conversion needed at layer 2 and provides a simpler less complicated network. The ultimate aim is to build Ethernet networks end-to-end regardless of the underlying media type.
Our 4 day training course, The Evolution of Ethernet explores the development of Ethernet.