AT&T® Fiber Distributed Data Interface (FDDI)

AT&T® Fiber Distributed Data Interface (FDDI) Service provides dedicated private lines between LANs or other devices needing high-speed connections. FDDI carries data at a speed of 100 megabits per second (Mbps), making it a high-performance data transmission solution.

FDDI Service is ideal for linking LANs at different locations within a campus or a metropolitan area. The dual token-passing ring architecture of FDDI protects against downtime because data always has two paths; a primary path, and a secondary path that acts as backup for disaster recovery. And since FDDI Service carries your data traffic on dedicated circuits, it gives you unmatched data security.

An FDDI ring can serve as a high-speed backbone for Ethernet or token-ring LANs spread across multiple sites. FDDI Service can also connect supercomputers and mainframes to LANs and, for high-speed distributed processing, to individual file servers, workstations, and PCs.

FDDI's high speed makes it ideal for publishing, imaging, concurrent CAD/CAM—any application that moves lots of ever-changing data from point to point or to multiple points. With capacity of up to 500 stations, FDDI Service from AT&T offers a viable path to your network's future.

You get...

Performance—FDDI's fiber optics provide high performance with nearly error-free transmission for bandwidth-intensive applications.

Volume—FDDI's 100 Mbps capacity can handle the complex, high-volume data needs of applications like printing, publishing, and CAD/CAM.

Combined Resources—FDDI Service provides a backbone network to connect isolated or dispersed LANs, linking them to form a single, powerful resource for your organization.

Security—FDDI Service maximizes security and eliminates contention by containing your data traffic on your organization's own dedicated private lines.

Compatibility—FDDI Service works with any data transmission protocols you use.

Reliability—FDDI's dual-path ring architecture makes your network connections redundant, protecting them from downtime.

It's good for...

Electronic mail
Team engineering and design
Concurrent computer-aided design and manufacturing
Advanced research (e.g., meteorology, seismology, nuclear
science)
Publishing and document imaging
Medical imaging


How it Works

In AT&T's Network

AT&T's FDDI Service carries your data over single-mode fiber-optic cable at a speed of 100 Mbps. Its exceptional reliability comes from it's dual token-passing ring architecture. Between any two points on the ring, transmission in one direction serves as a primary path. If the primary path fails, transmission moves instantly through the ring in the other direction—providing a quick backup path. And because FDDI Service uses fiber optics, electromagnetic signals and extremes in temperature won't disrupt transmission, resulting in very low error rates.

At Your Premises

At each site that AT&T® FDDI serves, you must connect to the AT&T network using a generic FDDI adapter. The adapter is an interface card that plugs into your routers, concentrators, or terminal equipment. Each site connects to AT&T's network via a dedicated fiber-optic cable.

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