Quote:
Originally Posted by Sephiroth
Your downstream SNR is way too low. i.e. too much noise on the line. It needs to be 35 dB or above.
Maybe the coax cable needs screwing in tightly either end - or else it's an engineer job. It can be in the splitter into your house, anywhere up to the street cabinet or beyond.
|
It is a bit low but note the downstream modulation Seph. I guess VM know the network sucks in that area, hence 64QAM. It's a shade low rather than being horrid as it would be on 256QAM where 33dB would be a requisite.
Really the modem should be ok-ish with that, check out the specs for a BER / Bit Error Rate of < 1 x 10^8 that one modem manufacturer claim:
Signal-to-Noise Ratio (SNR)
Euro-DOCSIS:
64QAM: >= 25.5dB
256QM: -13 dBmV ~ -6dBmv >= 34.5dB
-6dBmV~ +17dBmV >= 31.5dB
Here also are the power level operating parameters for Euro-DOCSIS that same manufacturer supplies:
64 QAM: –17 dBmV ~ +13dBmV
256 QAM: –13dBmV ~ +17 dBmV