A local area network standard for data transmission is Fiber Distributed Data Interface (FDDI). Although copper cable was later designated as the preferred physical medium, it may still be known as CDDI (Copper Distributed Data Interface), which is standardised as TP-PMD (Twisted-Pair Physical Medium-Dependent), also known as TP-DDI (Twisted-Pair Distributed Data Interface). Fast Ethernet, which offered the same 100 Mbit/s speeds but at a considerably reduced cost, and, since 1998, Gigabit Ethernet, due to its speed, even lower cost, and widespread use, effectively rendered FDDI useless in local networks. Both a Single-Attached Station (SAS), token bus passing ring topology and a Dual-Attached Station (DAS), counter-rotating token ring topology are available from FDDI. Browse this PPT for more details.

Dency Varghese

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