IEEE 80212 Fast LANs

This specification covers the system known as 100VG AnyLAN. Developed by Hewlett-Packard, this system operates on voice grade (CAT3) cable - hence the VG in the name. The AnyLAN indicates that the system can interface with both IEEE 802.3 and IEEE 802.5 networks (by means of a special speed adaptation bridge).


FDDI is a high sped token passing system that uses fiber optic as the medium. It is, in essence, a fast token ring system. It has the following characteristics:

• It supports speeds up to 100 Mbps

• It features dual contra-rotating rings for fault resilience

• It supports multiple tokens

• It supports up to 1000 nodes

• Nodes may be 2 km apart with multimode fiber, and 40 km with single-mode fiber.

IEEE 1394 Firewire

Firewire is a system originally designed to interconnect components on video cameras. It runs at a speed of 400 Mbps and supports of up to 63 devices on bus of up to 14 ft in length. It is hot-pluggable, i.e. devices can be connected or disconnected from the bus without affecting any participant on the bus. It also has power on the bus, so that devices do not have to be individually powered.

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