02-07-2012, 12:51 PM
FIBER DISTRIBUTED DATA INTERFACE
FIBER DISTRIBUTED DATA INTERFACE.ppt (Size: 758 KB / Downloads: 26)
Introduction
Shared media network like Ethernet ( IEEE 802.3) & IBM token ring (IEEE 802.5)
100 mbps speed
Runs on optical fiber
American National Standards Institute (ANSI) standard
FDDI Basic Principle
Token ring network like IEEE 802.5
Token: a special sequence of bits
Token circulates around the ring
A station removes the token from ring before transmission
After transmission, the station returns the token to the ring
Collisions are prevented as there is only one token in the ring
Token ring network like IEEE 802.5
Token: a special sequence of bits
Token circulates around the ring
A station removes the token from ring before transmission
After transmission, the station returns the token to the ring
Collisions are prevented as there is only one token in the ring
FDDI Physical Properties
Dual-counter-rotating token ring architecture
One ring is primary and the other secondary
Up to 500 stations with a maximum distance of 2 km between any pair of stations for multimode fiber
With single-mode fiber the distance can be up to 40 km
Maximum ring length is 100 km (total fiber length is 200 km for two rings)
FDDI Architectural Model
According to the OSI-RM, FDDI specifies layer 1 (physical layer) and part of layer 2 (data link control layer)
The physical layer handles the transmission of raw bits over a communications link
The data link control (dlc) layer is responsible for maintaining the integrity of information exchanged between two points
FIBER DISTRIBUTED DATA INTERFACE.ppt (Size: 758 KB / Downloads: 26)
Introduction
Shared media network like Ethernet ( IEEE 802.3) & IBM token ring (IEEE 802.5)
100 mbps speed
Runs on optical fiber
American National Standards Institute (ANSI) standard
FDDI Basic Principle
Token ring network like IEEE 802.5
Token: a special sequence of bits
Token circulates around the ring
A station removes the token from ring before transmission
After transmission, the station returns the token to the ring
Collisions are prevented as there is only one token in the ring
Token ring network like IEEE 802.5
Token: a special sequence of bits
Token circulates around the ring
A station removes the token from ring before transmission
After transmission, the station returns the token to the ring
Collisions are prevented as there is only one token in the ring
FDDI Physical Properties
Dual-counter-rotating token ring architecture
One ring is primary and the other secondary
Up to 500 stations with a maximum distance of 2 km between any pair of stations for multimode fiber
With single-mode fiber the distance can be up to 40 km
Maximum ring length is 100 km (total fiber length is 200 km for two rings)
FDDI Architectural Model
According to the OSI-RM, FDDI specifies layer 1 (physical layer) and part of layer 2 (data link control layer)
The physical layer handles the transmission of raw bits over a communications link
The data link control (dlc) layer is responsible for maintaining the integrity of information exchanged between two points