The document contains figures and descriptions about SONET and SDH networks. SONET is a standard telecommunications protocol that allows transmission and multiplexing of multiple digital bit streams. The document outlines the SONET network framework including layers, encapsulation of data, frame structures, overhead bytes, pointers, virtual tributaries, and multiplexing of signals.

1. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Chapter 20
SONET/SDH

2. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Figure 20-1
A SONET System

3. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Figure 20-2
An Example of a SONET Network

4. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Figure 20-3
SONET Layers

5. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Figure 20-4
Device-Layer Relationship in SONET

6. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Figure 20-5
Data Encapsulation in SONET

7. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Figure 20-6
STS-1 Frame

8. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Figure 20-7
STS-1 Frame Overhead

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Figure 20-8
STS-1 Frame Section Overhead

10. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Figure 20-9
STS-1 Frame Line Overhead

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Figure 20-10
Payload Pointers

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Figure 20-11
STS-1 Frame Path Overhead

13. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Figure 20-12
Virtual Tributaries

14. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Figure 20-13
VT Types

15. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Figure 20-14
STS-n

16. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Figure 20-15
STS Multiplexing

17. McGraw-Hill ©The McGraw-Hill Companies, Inc., 2001
Figure 20-16
ATM in an STS-3 Envelope