RECOMMENDATION ITU-R S.1323-1 - MAXIMUM PERMISSIBLE LEVELS OF INTERFERENCE IN A SATELLITE NETWORK (GSO/FSS; NON-GSO/FSS; NON- ANNEX 1 - Methodologies for determining whether interference to a network in the FSS (GSO/FSS; non-GSO/FSS; non-GSO/MSS ... PART 1 - Methodology A 1 Basic assumptions 2 Input data 3 Proposed procedure 3.1 Verification of compliance with recommends 3 3.2 Derivation of interference allowances 4 Interference into systems using transparent transponders: joint effects of uplink and downlink fading and interference 5 Consideration of degradation due to fading in links with variable elevation angle 6 Examples of application of Methodology A 6.1 Derivation of interference mask 6.2 Verification of whether the requirements in recommends 3 are met PART 2 - Methodology A' 1 Introduction 2 Proposed procedure 2.1 Step 1: characterization of permitted degradation in C/N 2.2 Step 2: characterization of degradation due to fading and other short-term variations in link characteristics 2.3 Step 3: characterization of the permitted interference 2.4 Step 4: Convolution of pdfs 2.5 Step 5: determination of the interference mask 2.6 Step 6: multiple interfering networks 3 Possible refinement to Methodology A' PART 3 - Methodology B 1 Basic assumptions 2 Input data 3 Proposed procedure 4 Example 1 of Methodology B: (LEO A) 5 Example 2 of Methodology B: (LEO B) APPENDIX 1 TO ANNEX 1 - A method to take account of uplink thermal noise in transparent-transponder satellite systems ANNEX 2 - Procedure for assessing interference criteria with respect to recommends 3.1 of this Recommendation 1 Introduction 2 Assumptions and notations 3 Procedure D 3.1 Procedure D using direct convolution 4 Example of application 4.1 VSAT communication inbound - 153.6 kHz APPENDIX 1 TO ANNEX 2 - Algorithm of the software 1 General algorithm 2 Description of the different boxes 2.1 Box A: read input files 2.2 Box B: generate models 2.3 Box C: calculation of the C/(N ? I) statistics 2.4 Box D: calculation of the relative reduction of availability 3 Description of the functions implemented 3.1 Calculation of the clear sky conditions of the carrier 3.2 Calculation of the rain conditions of the carrier ANNEX 3 - A procedure for assessing interference to links with variable elevation angle 1 Introduction 2 Implementation of the methodology 2.1 General algorithm 2.2 Example of application ANNEX 4 - Procedure to determine acceptable epfd? levels via Methodology B 1 Introduction 2 Expected interference scenarios 2.1 Scenario 1 2.2 Scenario 2 2.3 Scenario 3 2.4 Scenario 4 2.5 Scenario 5 3 The effect of transmission gain, ? 4 Selection of pfd equation 4.1 Parameter values for calculating epfd? and epfd? 5 Overall principles for the establishment of candidate epfd? limits via Methodology A'