Fiber distributed data interface
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Fiber-distributed data interface (FDDI) is standard one to perform data transmission by LAN.
Summary
As for the data head, as for 4500 octets, Mayor of maximum network, as for 200km, the distance between the biggest nodes, 2,000m, the maximum connection terminal are 500. I adopt the FDDI protocol based on a Token Ring protocol. In addition to covering a very large geographical area, the LAN by the FDDI can support thousands of users. Optical fiber is used as standard constitution (I can use a copper cable, but, in that case, become the CDDI). Two folds of FDDI becomes the ring constitution and use a Token Ring method.
As for the FDDI, ANSI, X3-T9 of American National Standards Institute became important and were standardized. I follow the OSI Reference Model of the LAN using other protocols. FDDI-II adds the service of the switchboard to the network with a kind of the FDDI and can treat the multimedia including a sound and the picture. An FDDI network and the connection with the opening Synchronous Optical Network SONET began.
Two folds of FDDI networks become the ring constitution and have the second ring to back it up when a primary ring breaks down. The primary ring provides transmission speed of up to 100Mbps. In addition, I transmit data at the second ring, and 200Mbps can widen transmission speed when a network does not need the second ring as backup. The single ring can widen maximum distance. The double ring can open to 100km. The FDDI has maximum frame size bigger than ethernet of standard 100Mbps and can make throughput better.
When I design the FDDI network, plural FDDI rings usually make structure connected hierarchically. FDDI rings are connected with some apparatuses (there are many cases of a router and the concentrator) (they attach dual). The computer is connected to a router and a concentrator by a thing lure touch. The FDDI ring of the simplest structure an apparatus in the case of nothing. In general, an FDDI network is comprised of area of the computer room degree, but there is the example that the wide area FDDI such as the network in the city was realized.
Because the data line passes all the connected apparatuses in the case of ring constitution by all means and all those apparatuses must be always applied, as for the FDDI, the hierarchy constitution with plural rings is required (when the bypass by the optical fiber is considered, but it is lacking in reliability according to the network engineer and is easy to usually cause errors). A work station and the minicomputer having difficult control by the network administrator are not suitable for FDDI connection.
Dual assumes a work station a dual home (being connected to two different apparatuses in the same FDDI ring) in substitution for attaching it, and dual can get reliability at the same level as attaching it. When one connection is effective, the other connection is blocked automatically. Connection for the backup succeeds it instantly first when a connection fails.
Have been used for interconnection of the yard ethernet mainly, but from speed, an expense, versatility Fast Ethernet Gigabit Ethernets spread (after 1998), and the FDDI was not used. The vendor withdraws from FDDI, too, and the use is ending now.
Next is included in four FDDI standards.
- ANSI X3T9.5, containing Physical Media Dependent (PMD) specifications
- ANSI X3T9.5, containing the Physical (PHY) specifications
- ANSI X3.139, containing Media Access Control (MAC) specifications
- ANSI X39.5, containing the Station Management (SMT) specifications.
The source: I am used with permission by Federal Standard 1037C and http://www.Foldoc.org.
Commercial service
Although the commercial examples which gave a service using the FDDI are few, telecommunications company exists.
Tokyo Telecommunication Network (TTNet, later パワードコム) affiliated with Tokyo Electric Power started the offer of the dedicated line service by the FDDI by the name of "the service for exclusive use of the FDDI" in Japan in 1998. But the contract for 2 lines was necessary, and a limit of the distance that could be connected from the limitation of the protocol called the FDDI added the standard contract that was severe ([1] painful in TTNet in a connection range as "same MA") to limitation having been big service in various ways to take the dual home (ring) constitution because it was single home constitution and did not spread for service too much by the price of the wide area ethernet service decreasing rapidly when I entered in the 2000s, and having lost price competitiveness. After パワードコム was merged by KDDI, service was provided by KDDI, but it is considered that the offer of the service was finished in about 2007 [2].
Footnote
- Service - ITPro, network serious matter celebration for exclusive use of the ^ FDDI
- In an exclusive service contract article of ^ KDDI, the description about "service for exclusive use of the FDDI" is seen in the clause of "the additional clause" until about 2007.
This article is taken from the Japanese Wikipedia Fiber distributed data interface
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