AT&T DEFINITY 2500 series Network Manual page 13

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Figure B-11. External and Internal Reference Levels
Figure B-12. Nonpublic Network without Digital Switches
Figure B-13. Proper Use of Backup Facilities
Figure B-14. Improper Use of Backup Facilities
Figure B-15. Optimal Diverse Routing
Figure B-16. Less Than Optimal Diverse Routing
Figure B-17. Excessive Cascading
Figure B-18. Minimized Cascading
Figure B-19. Excessive Synchronization from One Node
Figure B-20. Minimized Synchronization from One Node
Figure D-1. OSI Reference Model
Figure D-2. ISDN Protocols
Figure D-3. Data mode 1 With DCP and DS1/DMI/BOS Frame Multiplexing
Arrangements
Figure D-4. Data mode 2 Frame Structure
Figure D-5. DCP Frame Format
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CONTENTS
B-19
B-20
B-21
B-22
B-23
B-24
B-25
B-25
B-26
B-27
D-4
D-9
D-13
D-15
D-17