RECOMMENDATION ITU-R P.842-2 - Computation of reliability and compatibility of HF radio systems 1 Introduction 2 Inputs to the basic reliability computation 3 Computation of basic circuit reliability (BCR) 4 Basic reception reliability (BRR) 5 Basic service reliability (BSR) 6 Computation of overall circuit, reception and service reliability 7 Reliability estimation in HF networks 7.1 Basic path reliability (BPR) 7.2 Basic communications reliability (R) 8 Computation of compatibility 9 BCR for digital modulation systems APPENDIX 1 1 Terms relevant to the operation and design of HF radio systems 2 Terms relevant to prediction techniques