FDDI - 5 : History and Development скачать в хорошем качестве

FDDI - 5 : History and Development

FDDI stands for Fiber Distributed Data Interface. Although it was originally designed to operate only over fiber cabling, FDDI is also available today for use over twisted pair cabling. When used over twisted pair it is called TP-PMD, which stands for Twisted Pair - Physical Medium Dependent. In the late 1980s and early 1990s most PCs were connected by 10 megabit Ethernet. While this was good enough for the desktop connection, it was insufficient for switch-to-switch connections, which make up the backbone, or for connections to servers. Higher bandwidth was required. FDDI was seen as a way to fill that need. FDDI was implemented as the backbone between switches and was used to directly attach servers to the network at higher bandwidths. FDDI was developed from the beginning as a 100 megabit architecture, and has really never supported any other bandwidth. FDDI also had the advantage of supporting long distances between devices. FDDI could extend 20, 40, even 80 kilometers, making FDDI very attractive to large campuses or military locations. In the mid-1990s FDDI was the backbone connection for 70% of all Ethernet networks in the United States. However, FDDI's cost kept it from being used at the desktop. On average, FDDI ports cost up to 10 times as much as an Ethernet port. The desktop connection remained 95% Ethernet or token ring. Only companies with extremely deep pockets, who needed high bandwidth to the desktop, could afford FDDI installed everywhere. #FDDI #LANprotocol #backbone