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APPENDIX A: BASIC FDDI NETWORKS
Page A-4 BRIM-F6 User’s Guide
Figure A-2. Wrapping a Broken Ring
A.4 ANSI Standard X3T9.5
The X3T9.5 standard includes: Station Management (SMT), Media
Access Control (MAC), Physical Layer Medium Dependent (PMD)
standards and Physical Layer Protocol (PHY). Each section defines a
unique entity of the FDDI station architecture and its operation.
The X3T9.5 entities perform many of the lower layer functions of the OSI
network model Data Link and Physical Layers (Figure A-3).
CONCENTRATOR 3
WRAP
CONCENTRATOR 2
CONCENTRATOR 1
CONCENTRATOR 4
PRIMARY
RING
SECONDARY
RING
A B
A B
A
B
A
B
BRIM-F Book Page 4 Monday, January 29, 1996 9:26 AM