Madge Networks 802.11b Bedienungsanleitung PDF herunterladen (Seite 11)

FDDI -Fiber Distributed Data Interface

(ANSI X3T12)

• Similar to token ring, except that

– FDDI runs on fiber-optic (token ring runs on twisted pair)

– FDDI is based on IEEE 802.4 token bus rather than IEEE 802.5

token ring standard

• In Token bus, token is explicitly transmitted to the “next” node

– Has two counter-rotating rings i.e., data flow is in opposite direction

to the other ring

• Rings are independent: primary and secondary

• During normal operation primary ring is used

• During node failure, the primary ring wraps around secondary

ring, creating a single ring and bypassing the failed node

– All nodes participate equally in maintaining the FDDI ring

– Data rate is : 100 Mbps

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Madge Networks 802.11b Bedienungsanleitung Seite 11