17. To be precise, the probability of a block being decoded with an undetected error and passed to the LLC layer is 1.2 x 10-5 (assuming 8 symbol correction at cell edge of 17 dB C/I) and 2.75 x 10-8 (assuming 7 symbol correction at cell edge of 17 dB C/I). The CDPD specification recommends 7 symbol correction.