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I'm not sure how the DER0 and BER values are derived for CR, but to my understanding the basic consideration should be same with other. You can refer to "ran_020415_25GE_adhoc" for DER0 calculation. and "cideciyan_02a_1111" for PreFEC BER calculation for radom error.
As to the Q=5E-5, you can get it by Q(3.8906) there Q(x) is the Q function defined in Equation 95-1 and in mathematical also 0.5*erfc(x/sqrt(2)).
Hope a some helpful for you and may be someone can provide more details for the calculation process.
Senior SI and Architecture Engineer, ZTE
Table 136-13 has a DER value of 1E-4. 136.1 specifies BER of 2.4E-4. 188.8.131.52.3
calculates Q for 5E-5.
Could someone please point to the contribution(s) that relate these values?