FDDI


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FDDI

FDDI

FDDI

(Fiber Distributed Data Interface) Often pronounced "fiddy," it was a LAN and MAN access method that had its heyday in the mid-1990s. FDDI was an ANSI standard token passing network that transmitted 100 Mbps over optical fiber up to 10 kilometers. It included its own network management system and could optionally run over copper wire (CDDI) with distance limitations. FDDI II added circuit-switched service to this normally packet-switched technology in order to support isochronous traffic such as real-time voice and video.

Dual Rotating Rings
FDDI provided an optional dual counter-rotating ring topology that contained primary and secondary rings with data flowing in opposite directions. If a line broke, the ends of the primary and secondary rings were bridged together at the closest node to create a single ring again.

Single Attached and Dual Attached
Nodes could be configured as Single Attached Stations (SAS) connected to concentrators or as Dual Attached Stations (DAS) connected to both rings. Groups of stations were typically wired to concentrators connected in a hierarchical tree to the main ring. Large networks could be configured as a "dual ring of trees," in which the dual ring provided the backbone to which multiple hierarchies of concentrators were attached.


MIC Connector
FDDI used a dual-fiber MIC plug and socket for connection to devices. See fiber-optic connectors.




MIC Connector
FDDI used a dual-fiber MIC plug and socket for connection to devices. See fiber-optic connectors.
References in periodicals archive ?
When contacted by M AIL T ODAY , FDDI secretary Ajay Kumar and Bhatia refused to comment on the issue.
Through the FDDI, franchisees can obtain needed management training and technical assistance to ensure success of the business.
Several unique solutions allow you to install Gigabit Ethernet on your existing fiber pairs and provide switched connectivity to your existing FDDI equipment.
High-rate, switched fiber-optic communications is in a phase similar to FDDI's several years ago.
This approach is particularly beneficial in FDDI scenarios where backbones are bogged down and enterprises are contemplating bandwidth solutions by adding a switching capability to their shared network.
It provides 12 shared or dedicated 10 Mb/s ports that are switched to high-speed FDDI.
Brad Lister, chairman of a task force charged with planning the university's communications networks, says, "Early on, we called for Level 4 UTP as the premises wiring standard, but we've since switched to Level 5, which we expect will handle the copper-based equivalent of 100 Mb/s FDDI."
LightStream Corp, Billerica, Mass., has improved its 2010 ATM switch by adding bridging and routing features and new FDDI and Ethernet interfaces that allow native LAN internetworking over an ATM backbone.
A third FDDI ring, at the manufacturing site, is connected to the main building via InteLAN using the Multi Protocol Router (MPN) and a Hewlett-Packard remote bridge over one T1 link.
One factor showing the growth of FDDI has been the relatively high cost of optical fiber and optoelectronics.
In looking at FDDI, Amoco turned to switching hubs to link its existing Ethernet resources with FDDi backbones.
Any LAN using star wiring has the central point of wiring concentration needed for the ATM switch, and adapter cards can replace or supplement old Ethernet, token ring or FDDI cards.