Fiber Optic Wiki

XFP transceiver

July 18, 2011

The XFP (10 Gigabit Small Form Factor Pluggable ) is a standard for transceivers for high-speed computer network and telecommunication links that use optical fiber. It was defined by an industry group in 2002, along with its interface to other electrical components which is called XFI.

The XFI electrical interface specification

July 18, 2011

The XFI electrical interface specification was a 10 gigabit per second chip-to-chip electrical interface specification defined as part of the XFP multi-source agreement. It was also developed by the XFP MSA group. XFI provides a single lane running at 10.3125 Gbit/s when using a 64B/66B encoding scheme. A serializer/deserializer is often used to convert from a wider interface such as XAUI that has four lanes running at 3.125 Gbit/s using 8B/10B encoding. XFI is sometimes pronounced as "X" "F" "I" and other times as "ziffie".

Fiber Distributed Data Interface

July 18, 2011

Fiber Distributed Data Interface (FDDI) provides a 100 Mbit/s optical standard for data transmission in a local area network that can extend in range up to 200 kilometers (124 miles). Although FDDI logical topology is a ring-based token network, it does not use the IEEE 802.5 token ring protocol as its basis; instead, its protocol is derived from the IEEE 802.4 token bus timed token protocol. In addition to covering large geographical areas, FDDI local area networks can support thousands of users. As a standard underlying medium it uses optical fiber, although it can use copper cable, in which case it may be referred to as CDDI (Copper Distributed Data Interface). FDDI offers both a Dual-Attached Station (DAS), counter-rotating token ring topology and a Single-Attached Station (SAS), token bus passing ring topology.

Fiber Distributed Data Interface Mitigating failure

July 18, 2011

FDDI requires this network topology because the dual ring actually passes through each connected device and requires each such device to remain continuously operational. The standard actually allows for optical bypasses, but network engineers consider these unreliable and error-prone. Devices such as workstations and minicomputers that might not come under the control of the network managers are not suitable for connection to the dual ring.

History, advantages ,structure of Fiber Optical Cable

July 18, 2011

The history of Fiber Optic Cable In 1870, John Tyndall demonstrated that light follows the curve drizzle of water from a container, it is this simple principle, that the investigation and development of applications has led to this phenomenon. John Logie Baird patented a method of transmitting light in a glass rod for use in a color television at first, but the losses in optical materials at the time of use impractical. In the 1950s, more research and development in the transmission of visible images through optical fibers have led to some success in the medical world as it began with them in the remote lighting and visualization tools. In 1966, Charles Kao and George Hockham proposed the transmission of information on fiber, and they also knew that a practical proposition, much smaller losses in the cables were essential. This was the driving force behind the development of losses in optical fiber production improved and today optical losses are significantly lower than the initial target by Charles Kao and George Hockham together.