Cabletron Systems manual Fddi Devices, BRIM-F6 User’s Guide A-9

Page 35

FDDI Devices

Port A

Port B

Port A

Port B

 

1

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Port M

Port M

 

 

 

 

 

Port M

Port M

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Backup

 

 

 

 

 

 

 

 

 

Primary

Connection

Port A

 

Port B

 

Connection

3

Figure A-6. Dual Homing Topology

Concentrator 3 in Figure A-6 has redundant connections to the main ring through either concentrator 1 or 2. The FDDI connection rules only permit one active connection, Port B. If a cable failure severs concentrator 3’s connection to concentrator 2, CFM activates Port A.

A.6 FDDI Devices

FDDI recognizes four station configurations (SAS, DAS, DAC, and SAC). These configurations differ by the mix of FDDI entities within the station (see Figure A-7).

All stations must have:

one SMT

at least one MAC

one PMD

one PHY.

BRIM-F6 User’s Guide

Page A-9

Image 35
Contents BRIM-F6 USER’S Guide Page Contents Page Chapter Introduction Getting Help Using This ManualBRIM-F6 Overview BRIM-F6 FeaturesBRIM-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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