AT&T 7100 series, 7500 series, 2500 series manual Figure B-11 External and Internal Reference Levels

CONTENTS xiii

_______________________________________________________________________________________
_
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