CONTENTS

�1���� Introduction and scope
������� 1.1���� General
������� 1.2���� Parameters to be measured
������� 1.3���� Accuracy requirements of measurements
�2���� References
�3���� Abbreviations
�4���� Measurement architectures
������� 4.1���� General considerations and measurement methodologies
������� 4.2���� Performance parameters and measurement architectures
������� 4.3���� Loopbacks
������� 4.4���� Summary of measurement architectures
�5���� Measurement method using controlled and monitored source and controlled and monitored sink (C,M/C,M)
������� 5.1���� General assumptions and constraints
������� 5.2���� Test devices
������� 5.3���� Trial sequences
������� 5.4���� Trial failures and recovery
������� 5.5���� Matching packet level reference events
������� 5.6���� Testing during service outages
������� 5.7���� Access trial
������� 5.8���� Data transfer trial
������� 5.9���� Disengagement trial
������ 5.10���� Estimating availability parameters
�6���� Method for synchronizing equipment
������� 6.1��� �Equipment synchronization
Annex A� �� Calculation of packet-switched network performance statistics
������� A.1���� Statistics
������� A.2���� Statistical formulas
������� A.3���� Throughput measurement correction factor
Annex B� �� Factors which may affect measured performance
������� B.1���� Signalling rates
������� B.2���� Data Link Layer window size
������� B.3���� Packet Layer window size
������� B.4���� Packet length
������� B.5���� Other virtual connections
������� B.6���� Time of day
������� B.7�� ��Throughput class
������� B.8���� D-bit usage
������� B.9���� Inter-packet gaps
������ B.10���� Reporting multiple tests made between different locations
Annex C� �� Examples of measurement uses
������� C.1���� Examples
������� C.2���� Pairwise and multiple comparisons