APPENDIX A: BASIC FDDI NETWORKS
CONCENTRATOR 3
WRAP
PRIMARY
RING
B
CONCENTRATOR 2
A
A | B |
SECONDARY
RING
A
B
CONCENTRATOR 4
B
A 
CONCENTRATOR 1
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
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