1. SEMINAR ON FDDI NAME REG. NO BRANCH

2. CONTENTS INTRODUCTION INTRODUCTION STANDARDS STANDARDS FDDI TRANSMISSION MEDIA FDDI TRANSMISSION MEDIA FDDI SPECIFICATIONS FDDI SPECIFICATIONS FDDI STATION -ATTACHMENT TYPE FDDI STATION -ATTACHMENT TYPE FDDI FAULT TOLERANCE FDDI FAULT TOLERANCE FDDI FRAME FORMAT FDDI FRAME FORMAT ADVANTAGES ADVANTAGES DISADVANTAGES DISADVANTAGES CONCLUSION CONCLUSION

3. INTRODUCTION The Fiber Distributed Data Interface (FDDI) specifies a 100-mbps token-passing,dual ring LAN using fiber-optic cable. The Fiber Distributed Data Interface (FDDI) specifies a 100-mbps token-passing,dual ring LAN using fiber-optic cable. It is frequently used as high-speed backbone technology because of it’s support for high speed bandwidth and greater distances than copper. It is frequently used as high-speed backbone technology because of it’s support for high speed bandwidth and greater distances than copper.

4. FDDI Uses Counter-Rotating Primary & Secondary Rings

5. STANDARDS FDDI was developed by the American National Standards Institute (ANSI) X3T9.5 standards committee in the mid-1980s. FDDI was developed by the American National Standards Institute (ANSI) X3T9.5 standards committee in the mid-1980s. After completing the FDDI specification, ANSI submitted FDDI to the International Organization for Standardization (ISO). After completing the FDDI specification, ANSI submitted FDDI to the International Organization for Standardization (ISO).

6. FDDI Transmission Media FDDI uses optical fiber as the primary transmission medium, but it also can run over copper cabling. FDDI uses optical fiber as the primary transmission medium, but it also can run over copper cabling. Optical fiber has several advantages over copper media. Optical fiber has several advantages over copper media. FDDI defines two types of optical fiber: single-mode and multimode. FDDI defines two types of optical fiber: single-mode and multimode. Modal Dispersion and it’s advantage. Modal Dispersion and it’s advantage. Comparison between Single-mode and Multimode. ` Comparison between Single-mode and Multimode. `

7. Light Sources Differ for Single- Mode and Multimode Fibers

8. FDDI Specifications Media Access Control (MAC) Media Access Control (MAC) Physical Layer Protocol (PHY) Physical Layer Protocol (PHY) Physical-Medium Dependent (PMD) Physical-Medium Dependent (PMD) Station Management (SMT) Station Management (SMT)

9. FDDI Specifications Map to the OSI Hierarchical Model

10. FDDI Station-Attachment Types FDDI defines four types of devices: Single-attachment station (SAS) Single-attachment station (SAS) Dual-attachment station (DAS) Dual-attachment station (DAS) Single-attached concentrator (SAC) Single-attached concentrator (SAC) Dual-attached concentrator (DAC) Dual-attached concentrator (DAC)

11. FDDI DAS Ports Attach to the Primary and Secondary Rings

12. Concentrator Attaches to Both the Primary and Secondary Rings

13. FDDI Fault Tolerance Dual Ring : If a station on the dual ring fails or is powered down, or if the cable is damaged, the dual ring is automatically wrapped (doubled back onto itself) into a single ring. If a station on the dual ring fails or is powered down, or if the cable is damaged, the dual ring is automatically wrapped (doubled back onto itself) into a single ring. Optical Bypass Switch : This is used both to prevent ring segmentation and to eliminate failed stations from the ring. This is used both to prevent ring segmentation and to eliminate failed stations from the ring. Dual Homing :

14. Ring Recovers from a Station Failure by Wrapping

15. Ring also Wraps to Withstand a Cable Failure

16. Optical Bypass Switch Uses Internal Mirrors to Maintain a Network

17. Dual-Homed Configuration Guarantees Operation

18. FDDI Frame Format Preamble Preamble Start delimiter Start delimiter Frame control Frame control Destination address Destination address Source address Source address Data Data Frame check sequence (FCS) Frame check sequence (FCS) End delimiter End delimiter Frame status Frame status

19. FDDI Frame Is Similar to That of a Token Ring Frame

20. Advantages FDDI combines the advantage of token passing on the ring topology with the high speed of the fiber optic transmission. FDDI combines the advantage of token passing on the ring topology with the high speed of the fiber optic transmission. Its dual ring topology provides redundancy and fault tolerance. The fiber optic cable is not susceptible to EMI and noise and is more secure than copper wiring. Its dual ring topology provides redundancy and fault tolerance. The fiber optic cable is not susceptible to EMI and noise and is more secure than copper wiring. It can send data for greater distance between repeaters than Ethernet and traditional token ring. It can send data for greater distance between repeaters than Ethernet and traditional token ring.

21. Disadvantages As always high speed and reliability come with a price. As always high speed and reliability come with a price. FDDI is relatively expensive to implement and its distance limitation is less restrictive than of other LAN links make it unsuitable for true WAN communication. FDDI is relatively expensive to implement and its distance limitation is less restrictive than of other LAN links make it unsuitable for true WAN communication.

22. Conclusion FDDI is a good choice for medium sized network – MAN”S and large LAN. FDDI is a good choice for medium sized network – MAN”S and large LAN. The widespread acceptance of FDDI is due mainly to the dramatic improvement in the price and performance characteristic of optical fiber. The widespread acceptance of FDDI is due mainly to the dramatic improvement in the price and performance characteristic of optical fiber. The FDDI has an extended future with opportunities for lower cost designer alternatives media types, and greater levels of circuit integration. The FDDI has an extended future with opportunities for lower cost designer alternatives media types, and greater levels of circuit integration.

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