Table of Contents
Issue 1 December 1997 A-i
A
A SONET Overview
Overview A-1
History A-1
Basic Purpose A-2
Technical Overview A-2
â– SONET Signal Hierarchy A-2
â– SONET Layers A-4
â– SONET Frame Structure A-6
â– Section Overhead A-6
â– Line Overhead A-7
â– Path Overhead A-8
STS-1 Path Overhead A-8
VT Path Overhead A-9
â– SONET Multiplexing Procedure A-10
â– SONET Demultiplexing Procedure A-12
â– SONET Digital Multiplexing Schemes A-14
Asynchronous Multiplexing A-14
Synchronous Multiplexing A-15
â– Virtual Tributary Signals A-15
â– Concatenated Mode A-16
SONET Interface A-17
â– SONET Payloads A-18
â– Higher Rate Transport A-19
Conclusion A-19