The reliabilities discussed in this Recommendation form a hierarchy as illustrated in Fig. 1. Basic reliabilitiesare discussed in $ 2 to 5, overall reliability in 0 6, reliability in HF networks in $ 7 and compatibility in $ 8.
ITU-R PI.842-1-1994 history
1994ITU-R PI.842-1-1994 Computation of Reliability and Compatibility of HF Radio Systems