AT&T DEFINITY 7200 series - Manual (Page 13)

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