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APPENDIX A: BASIC FDDI NETWORKS
Page A-14 BRIM-F6 User’s Guide
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.
FDDI
to
FDDI
BRIDGE
Ethernet/802.3
Network
FDDI
NETWORK
FDDI
NETWORK
DUAL ATTACHED
CONCENTRATOR
DUAL ATTACHED
CONCENTRATOR
SINGLE ATTACHED
CONCENTRATOR
DAS
File
Server
DUAL
ATTACHED
STATION
Single Attached
Stations
Single Attached
Stations
Ethernet/802.3
Network
DUAL ATTACHED
CONCENTRATOR
Ethernet/802.3
Network
ETHERNET to
FDDI BRIDGE
ETHERNET to
FDDI BRIDGE
ETHERNET
to FDDI
BRIDGE
BRIM-F Book Page 14 Monday, January 29, 1996 9:26 AM
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