fibre distributed data interface
DESCRIPTION
Fibre Distributed Data Interface. 100Mbps 1986 ANSI - X3T9.5 committee Supports IEEE 802.5 Access Methodology = Modified token-passing Logical topology = sequential Physical = Dual counter-rotating rings. Dual-Ring Topology. Subnets. Dual-Ring Topology. P rimary ring Traffic - PowerPoint PPT PresentationTRANSCRIPT
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Fibre Distributed Data Interface
• 100Mbps– 1986 ANSI - X3T9.5 committee – Supports IEEE 802.5
• Access Methodology = Modified token-passing• Logical topology = sequential• Physical = Dual counter-rotating rings
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Dual-Ring Topology
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Subnets
GOLDMAN: DATACOMM FIG. 06-07
8 pin RJ-45 jack for 10Base-T
BNC connector for 10Base-2 (thin coax ethernet)
DB-15 AUI connector for 10Base-5 (thick coax ethernet)
Jumpers to enable/disable media interfaces
Transceiverthick coax ethernet
DB-15 AUI
AUI or transceiver cable
DB-15 AUI
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Dual-Ring Topology• Primary ring
– Traffic– FDDI Reconfigures the network
• Redundancy– Transmission– Cable Failure– Ring Failure
• The total cable length of both rings combined must not exceed 200 km, and it cannot hold more than 1000 computers.
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Topology• FDDI operates at 100 Mbps over a dual-ring topology
that supports 500 computers over a distance of up to 100 km
• More than one computer at a time can transmit• Capacities should be divided in half.
– FDDI network should be limited to 500 computers and 100 km of cable.
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FDDI (continued)
A FDDI network
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FDDI• Connects large and small minicomputers• Back-end networks• FDDI works with backbone networks to which other
low-capacity LANs can connect• LANs that require high data rates• File transfer, Video, CAD & CAM
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FDDI in Star• FDDI computers can accommodate point-to-point
links to a hub.
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Built-in reliability• High degree of reliability and security
– EMI– RFI
• Two Rings– Primary ring – data– Secondary ring – backup– Single Hub or connector
• 500 nodes at 2km apart• SAS – single attachment station• DAS – dual attachment stations
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10GOLDMAN: DATACOMM
FIG. 05-13
FDDI concentrator hub
FDDI bridge
Microcomputer
Microcomputer
Microcomputer
Server
Minicomputer
Minicomputer
Server
Microcomputer MinicomputerMainframe computer
FDDI adapter cards or controllers for each device connected to an
FDDI concentrator/hub
inner loop transmission
direction
outer loop transmission
direction
FDDI Topology
SAS controller (accesses single
loop only)
Fiber
FiberFiber
STP
STP
STP
Ethernet transceiver
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Built-in Reliability
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FDDI Uses Beaconing
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Beaconing• With beaconing, the computer that detects a fault sends a
signal, called a "beacon," onto the network.
• The computer continues to send the beacon until it notices a beacon from its upstream neighbour, and then it stops sending.
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Standards• Distances in FDDI LAN• Impractical to turn a free token to busy• Physically removes token and transmits an entire
Data Frame.• Numerous messages can be sent• Synchronous Frames
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Modified Token Passing• Transmits as many frames as it can produce within a
predetermined.
• There can be several frames circulating on the ring at once.
• Higher throughput than a Token Ring network, which allows only one frame at a time to circulate.
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Application of FDDI• Bandwidth drivers fall into two categories:• Network Architecture Trends• Network Application Trends• LANs = more and more users• FDDI networks form the backbone
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Campus Backbone• Connecting LANs located throughout a series of
closely situated buildings.• Ring circumference can equal 200 km• Multiple FDDI LANs • 100 Mbps FDDI building backbone
– Connecting numerous 10-Mbps Ethernet– Servers connected via connectors
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Backbone
GOLDMAN: DATACOMM FIG. 05-16
File servers
Compute servers
Database servers
FDDI concentrator
FDDI concentrator
FDDI concentrator
router
router
Backbone
Workgroup
workstation
workstation
workstation
FDDI concentrator
server
Ethernet hubworkstation
workstation
workstation
Sub-workgroup
FDDI/Ethernet Bridge
FDDI concentrator
servers
Ethernet hubworkstation
workstation
workstation
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High-Bandwidth Workgroups• FDDI LANs connecting as few as 20 computers
– High-bandwidth communication– CAD/CAM Workstations
• Power Users– GUI
GOLDMAN: DATACOMM FIG. 05-16
File servers
Compute servers
Database servers
FDDI concentrator
FDDI concentrator
FDDI concentrator
router
router
Backbone
Workgroup
workstation
workstation
workstation
FDDI concentrator
server
Ethernet hubworkstation
workstation
workstation
Sub-workgroup
FDDI/Ethernet Bridge
FDDI concentrator
servers
Ethernet hubworkstation
workstation
workstation
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High-Bandwidth Subgroups• In some cases only 2 or 3 devices such as servers,
require high-bandwidth.• Increased demand
– Distributed Computing– Data Distribution
GOLDMAN: DATACOMM FIG. 05-16
File servers
Compute servers
Database servers
FDDI concentrator
FDDI concentrator
FDDI concentrator
router
router
Backbone
Workgroup
workstation
workstation
workstation
FDDI concentrator
server
Ethernet hubworkstation
workstation
workstation
Sub-workgroup
FDDI/Ethernet Bridge
FDDI concentrator
servers
Ethernet hubworkstation
workstation
workstation
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LAN Summary
Fibre OpticUTP/STPThick/ThinMedia
DUAL RINGRING/STARBUS/STARPhysical
SequentialSequentialBroadcastLog. Top
Modified TPToken PassingCSMA/CDAccess Meth.
FDDIToken RingEthernet
Phy
sica
l L
ayer