RECOMMENDATION ITU-R S.1522 - Impact of loss of synchronization and timing recovery ... ANNEX 1 - Considerations for HRDPs when implemented for providing services whose availability ... 1 Introduction and purpose 2 Digital video and audio receivers 3 Data receivers 4 Packet services 5 On-board processing satellite networks 6 Summary and conclusions ANNEX 2 - Loss of synchronization due to short-term interference in an MPEG-2 digital video and audio receiver 1 Introduction 2 Objective and approach 3 Receiver description 3.1 Receiver performance 4 System test facility 4.1 System test results 5 Conclusions ANNEX 3 - The effect of interference events on service availability 1 Introduction and objective 2 Definitions 3 Availability and user requirements 4 Analysis 4.1 Event duration and number of events per year 5 Discussion 6 Conclusions ANNEX 4 - Criteria for determining threshold for synchronization