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CONTENTS
LIST OF FIGURES
Figure 1-1.
Figure 1-2.
Figure 1-3.
Figure 1-4.
Figure 1-5.
Figure 1-6.
Figure 1-7.
System 85 R2V4 ISDN Configuration
Generic 2 ISDN Network Configuration
Generic 1 ISDN Network Configuration
D4 Framing
DS1 Extended Superframe Format
DS1 Signal, Framing Format, and ESF Superframe (24 Frames)
Alternate Mark Inversion
Example of B8ZS Line Coding
ISDN Message Signaling Format
On-Premises Metallic-Cable Configurations
Off-Premises Metallic Cable Configuration
Nonmetallic Cabling Configurations
CEM and CDM Cable Configurations
End-to-End Loss Configuration Using Combination Tie Trunks
Figure 1-8.
Figure 1-9.
Figure 3-1.
Figure 3-2.
Figure 3-3.
Figure 3-4.
Figure 4-1.
Figure 5-1.
Figure 5-2.
Figure 5-3.
Figure 5-4.
Figure 5-5.
Options for Synchronization
Synchronization Hierarchy
Stratum Levels for the Synchronization Hierarchy
SCS (Generic 2)
Duplicated Synchronization Architecture and Cross Coupling
Tone-Clock Synchronizer (Nonduplicated, Generic 1)
Public-Network External Clock
External Clock
External-Clock Interface
External-Clock Duplicated Synchronization
External and Internal Reference Levels
Nonpublic Network without Digital Switches
Proper Use of Backup Facilities
Improper Use of Backup Facilities
Optimal Diverse Routing
Less Than Optimal Diverse Routing
1-5
1-6
1-7
1-11
1-12
1-13
1-17
1-19
1-26
3-5
3-6
3-7
3-8
4-5
5-2
5-5
5-7
5-8
5-9
5-12
5-15
5-16
5-17
5-17
5-19
5-20
5-21
5-22
5-23
5-24
Figure 5-6.
Figure 5-7.
Figure 5-8.
Figure 5-9.
Figure 5-10.
Figure 5-11.
Figure 5-12.
Figure 5-13.
Figure 5-14.
Figure 5-15.
Figure 5-16.