Cabletron Systems manual Appendix a Basic Fddi Networks, BRIM-F6 User’s Guide A-1

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APPENDIX A

BASIC FDDI NETWORKS

This Appendix covers basic Fiber Distributed Data Interface (FDDI) network concepts relating to FDDI network design and installation.

ANSI Standard X3T9.5 provides greater detail on FDDI access methods. Reference this standard whenever you need more complete information. Specific areas presented here include:

Basic FDDI Concepts

FDDI Devices

Design and Installation Considerations.

A.1 Basic FDDI Concepts

An FDDI network provides a high-speed (100 Mbit/sec.), fiber optic network capable of reliable data transmission. The fiber optic media provides increased bandwidth, immunity from electrical noise, security, and permits the use of longer cable segments. These features make FDDI a viable alternative in LAN backbone applications, or as a back-end or front-end network between processors.

A.2 FDDI Media Access Protocol

The FDDI standard X3T9.5 describes the media access and token passing protocol for FDDI networks. Each station on an FDDI ring has a unique station address, differentiating it from all other stations. A special frame, called a token, controls transmission.

Only one station, the station holding the token, can transmit at any given time. This token circulates around the ring from station to station. Each station receives the token from the station preceding it on the ring, retains it while transmitting data (frames) and then passes (transmits) the token on to the next active station on the ring.

BRIM-F6 User’s Guide

Page A-1

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Contents BRIM-F6 USER’S Guide Page Contents Page Chapter Introduction Getting Help Using This ManualBRIM-F6 Features BRIM-F6 OverviewBRIM-F6 Overview Related Documentation Unpacking the Brim and the FPIMs Chapter InstallationFpim Screws Installing the FPIMsInstalling the BRIM-F6 Installing the BRIM-F6Installing a BRIM-F6 into a MIM Brim Tab Installing a BRIM-F6 into a Hub BRIM-F6 User’s Guide Chapter Using Lanview TWR Twisted Ring Fiber Optic Interface Chapter SpecificationsMultimode Receiver Signal Detect Single Mode Receiver Single Mode SpecificationsUnshielded Twisted Pair Receiver Signal Detect Shielded Twisted Pair Transmitter Specifications Cable SpecificationsMultimode Fiber Twisted Pair Cable Length Twisted Pair Pinout ConfigurationEnvironment SafetyBRIM-F6 User’s Guide A-1 Appendix a Basic Fddi NetworksAppendix a Basic Fddi Networks BRIM-F6 User’s Guide A-3 ReliabilityFigure A-2. Wrapping a Broken Ring BRIM-F6 User’s Guide A-5 Ansi Standard X3T9.5Figure A-4. Token and Frame Formats Fddi Station BRIM-F6 User’s Guide A-7Fddi Connection Rules BRIM-F6 User’s Guide A-9 Fddi DevicesFigure A-7. Valid Station Configurations BRIM-F6 User’s Guide A-11 Figure A-8. Duplex Fiber Optic Receptacles and ConnectorsA-12 Bypass State Operational State BRIM-F6 User’s Guide A-13Figure A-10. Fddi Devices BRIM-F6 User’s Guide A-15 Design Considerations For Fddi NetworksBandwidth BRIM-F6 User’s Guide A-17 Figure A-11. Physical Device Connections
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