Emerged Technologies FDDI

1
Emerged TechnologiesFDDI

• Nirmala Shenoy
• Information Technology Department
• Rochester Institute of Technology

2
FDDI

• Purpose
• Fiber Distributed Data Interface I II
• High Capacity LAN fiber based, twisted pair
• High speed backbone to interconnect LANs
• Cost effective
• Dual ring concept one ring backup
• Can be extended to 200km

3
FDDI

• Topology
• Station can be connected on 2 rings or 1 ring
• Dual Attachment Station Class A
• Single Attachment Station Class B
• Wiring Concentrator

4
FDDI

• Topology

5
FDDI

• Layers
• Data Link layer
• Logic Link control
• MAC layer
• Token handling
• Error checking
• Data link Addressing

6
FDDI

• Layers
• Physical Layer
• Physical sub Layer PHY
• Coding clocking, data framing independent of
  physical medium
• Physical Medium Dependent PMD
• Power level control, cables, connections etc

7
FDDI

• Layers
• Station Management SMT
• Spans MAC and PHY (full)
• Node configuration
• Ring initialization
• Connection management
• Error Detection recovery

8
FDDI

• PDUs
• FDDI frame a number of fields
• SD- Start Delimiter
• FC Frame control type of frame
• DA, SA Destination and Source Addresses
• I User Information
• FCS Frame Check Sequence
• FS Frame Status
• ED End delimiter

9
FDDI

• Other Aspects
• FDDI backbone interconnect
• As a MAN extended distance
• Bridges, routers
• FNS

10
FDDI

• Other Aspects
• FDDI vs ATM
• FDDI II very slow progress
• Issues on twisted pair use

11
FDDI

• Conclusions
• Dual Ring protocol
• Self healing capability
• Can not Scale well Broadband ? Gigabits?
• Limited capacity