Specifications

A.12 Dual Ring Configuration Examples
A–30 FDDI Configuration Capabilities
A.12.4 Example 4 — Self Contained Dual Ring in the Backplane
You can create a dual ring, that is completely contained in the DEChub 900 back-
plane, by connecting all the backplane ports of the FDDI network modules together
(see Figure A–26.
Note that the DECconcentrator in Figure A–26 is providing M port tree connections
to externally treed FDDI stations (such as, bridges, concentrators or end user stations
that use S, A, or B ports). The Concentrator is not connected to an external M port
such as an external concentrator’s M port.
Figure A–26 Self-Contained Dual Ring in the Backplane
LKG-10092-96F
Front Panel Ports
Backplane Ports
Concentrator 1 PEswitch 1
MMMMMM
AB
BABA
PEswitch 2