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Originally Posted by monkeybreath
It sounds like an SNR problem.
If you contact tech support again, ask what the readings are for Cable Modem Signal to Noise Ratio, and also Channel SNR. Both figures should be above 20.
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Bad monkey!
Channel SNR irrelevant, however that cable modem's return SNR must be above 18 to receive a reasonable service, that's the minimum for a grief free service. As it drops below this service gets progressively worse.
To OP the question about TV reception is VERY relevant because if the downstream signal from ntl isn't good enough for cable modem you'll see artifacts on your digital TV reception dude.
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Downstream received signal power = 8.8 dBmV
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Yipes, got a 6db forward path conditioner you could pop on that, that's running pretty hot!