APPENDIX A: BASIC FDDI NETWORKS

Ethernet/802.3

Network

Single Attached

Stations File

Server

Ethernet/802.3 Network

ETHERNET to

FDDI BRIDGE

DUAL ATTACHED CONCENTRATOR

ETHERNET

to FDDI

BRIDGE

FDDI

NETWORK

FDDI

 

to

FDDI

FDDI

NETWORK

BRIDGE

 

DAS

 

DUAL

ATTACHED

STATION

Ethernet/802.3

DUAL ATTACHED

Network

CONCENTRATOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ETHERNET to

FDDI BRIDGE

DUAL ATTACHED

CONCENTRATOR

SINGLE ATTACHED

CONCENTRATOR

Single Attached

Stations

Figure A-10. FDDI Devices

A.7 Design Considerations For FDDI Networks

The main variables of interest to the FDDI network designer include ring length, drive distance (distance between nodes), and the maximum number of stations. While many factors determine the limits for these design elements, this section examines the ANSI standard and focuses on those factors that you can control in your network.

A.7.1 Ring Length

The maximum FDDI Ring Length is 100 km. ANSI standard X3T9.5 indirectly sets this limit by, instead of specifying ring length, defining default design parameters based on a total fiber path length of 200 km.

Page A-14

BRIM-F6 User’s Guide

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Image 40
Cabletron Systems BRIM-F6 manual Figure A-10. Fddi Devices