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Your attenuation is fine. It's actually 34. You've got 340 x 0.1db = 34
Is this good or bad?
Downstream Upstream
Line Coding(Trellis): On On
SNR Margin (dB): 139 118
Attenuation (dB): 365 225
Output Power (dBm): 130 -1
Attainable Rate (Kbps): 11308 1096
Rate (Kbps): 4096 511
D (interleaver depth): 1 1
Delay (msec): 0.25 0.24