FIBRE DISTRIBUTED DATA INTERFACE ( FDDI )
FDDI as a product of American National Standard Institute conforms to the Open system Interconection( OSI ) model of functional layer using other protocols..
What is FDDI ?.
- FDDI is a highly reliable way to transmit data using a double ring protocol based on the token ring protocol. A token ring protocol is a local area network where all the computers on the network are connected in a gaint circle and a token passing setup is emlpoyed to prevent data collision when two computers send data at the same time. FDDI uses two rings that are independent of each other and transmit data in opposite directions.
FDDI USED..
- FDDI is used mainly in mission critical and high traffic networks where large amount of data flow need to flow quickly and efficiently. FDDI is used anywhere that utilizes a large network in need of high bandwidth.
- Bussinesses, The Government hospitals, and other medical fields, stock exchanges and money markets and automobile industry. It has become the main stay access method of high speed networking in locla area and metropolitan area networks in many places.
Why Use FDDI ?
- FDDI offers more powerful workstations and servers, intensive network applications, growing distributed client/server applications, increasing number of network users and bigger and software applications. FDDI offers higher capacity and performance with more simultaneous transactions.
About FDDI..
- It is a standard for data transmission in a local area network it uses optical fibre as its standard underlying physical medium. altough it was also later specified to use Copper cable, in which case it may be called CDDI ( copper Distributed Data Interface ).
- FDDI provids a 100Mbits/s optical standard for data transmission in local area network that can extend in range upto 200 Kilometers. Although FDDI topology is a ring based token network. It did not use IEEE 802.5 token ring protocol instead its use 802.4 token bus timed token protocol.
- FDDI local area nerwork can supports thousand of users FDDI offers both a Double attached station ( DAS ) counter rotating token ring topology and Single attached station ( SAS ) token bus passing ring topoogy.
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| FDDI Block Diagram. |
FDDI has a larger maximum frame size (4,352) bytes than the standard ethernet family which only supports maximum frame size (1500) bytes.
Designers normally constructed FDDI ring in a network topology such as "double ring of tree"> FDDI requires this network toplogy because the double ring actually passes through each connected devices and requires each such device to remain continously operational.
FDDI was considered as attractive campus backbone network topology int the early to mid 1990s since existing ethernet networls only offered 10Mbit/s data rates and token ring network only offered 4Mbit/s or 16Mbit/s rates.
FDDI was effectively made obsolete in local networks by fast ethernet which offered the same 100 Mbit/s speeds.
FRAME FORMAT
The FDDI Data Frame Format is ..
PA SD FC DA SA PDU FCS ED/FS
16 bits 8 bits 8 bits 48 bits 48 bits 4478*8 bit 32 bits 16 bits
( Where PA is the preamble, SA ia the Start Delimeter, FC is Frame Control, DA is the Destination Address, SA is the Source Address, PDU is Protocol Data Unit or Packet Data Unit, FCS is Frame Check Sequence, ED and FS are End Delimeter and Frame Status.
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