pravdivi
2010-04-27, 02:15 AM
Contents
Introduction 1
What is the situation in the ªsynchronousº market? 4
Why SDH? 6
The synchronous digital hierarchie in terms of a layer model 10
What are the components of a synchronous network? 12
The STM-1 frame format 16
How are PDH and ATM signals transported by SDH? 20
What is the difference between SDH and SONET? 23
Pointer procedures 26
AU-4 contiguous concatenation 30
AU-4 virtual concatenation 32
Transmission at higher hierarchy levels 33
Error and alarm monitoring 34
Automatic protection switching 39
Synchronization 44
TMN in the SDH network 47
SDH measurement tasks 50
Sensor tests 52
APS time measurement 53
Performance analysis 55
Tandem Connection Monitoring 58
Jitter measurements 59
Overview of current ITU-T Recommendations 64
Abbreviations
no password
Introduction 1
What is the situation in the ªsynchronousº market? 4
Why SDH? 6
The synchronous digital hierarchie in terms of a layer model 10
What are the components of a synchronous network? 12
The STM-1 frame format 16
How are PDH and ATM signals transported by SDH? 20
What is the difference between SDH and SONET? 23
Pointer procedures 26
AU-4 contiguous concatenation 30
AU-4 virtual concatenation 32
Transmission at higher hierarchy levels 33
Error and alarm monitoring 34
Automatic protection switching 39
Synchronization 44
TMN in the SDH network 47
SDH measurement tasks 50
Sensor tests 52
APS time measurement 53
Performance analysis 55
Tandem Connection Monitoring 58
Jitter measurements 59
Overview of current ITU-T Recommendations 64
Abbreviations
no password