A 'fibre channel', or in the US 'fiber channel', is a means of transmitting data between computer devices at very fast rates. At the moment the fastest transfer rate is 4gbps.

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A core in fiber optics is a single strand of fiber. It forms one half-duplex channel, where one transmitter can send data to one receiver. In order to form a full-duplex channel, two cores or strands are required. Many fiber optic cables contain many cores organized in many bundles.

FDDI is a broad topic but if we want to describe in short then :

FDDI is a token ring network in which fiber optics cable is used as channel. there are three condition to design such a network-

1) there is a pair of fiber channel should passes to all the stations i.e. each host should have a pair of fiber optics cable(but should connected to only from one)

2)both channel should use same token

3)routing direction of both channel should be different.

the advantage of above three condition that if channel break down somewhere then we need to just short both channel and it will act as a single token ring channel.

transverse (T) tubule