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4 VM 2 answer plz. Official power levels

On our wavelength

Hi I would like for virgin media to answer please. 

Could you confirm what the official power level range should be for down stream and upload 

On a hub 5 1gig service 

Thank you in advance 



Downstream Power Levels of -7 to +7 dBmV are preferred, +10dBmV is the max acceptable, with a SNR of 33dB or higher across all channels. Rising error counts across many channels is a current service noise fault.

Power Levels of 35 to 49 dBmV are preferred, with QAM 64 Modulation mode across all four to six DOCSIS 3.0 channels.  Seeing QAM 32/16/QPSK is a current service noise fault.  Seeing less than four DOCSIS 3.0 channels is usually a signal level fault.

Very Insightful Person
Very Insightful Person

You will not get official figures from VM, they do not publish them. The following are mostly taken from the official DOCSIS documentation.

Downstream: no lower than -6dBmV and no higher than 10dBmV - Close to 0 is optimal. SNR >33 The actual DOCSIS spec allows a range of -13 dBmV to +17 dBmV



Upstream: no lower than 31dBmV and no higher than 50dBmV - 44dBmV -46dBmV is optimal. FTTP 27dBmV to 45bBmV

There are 10 types of people: those who understand binary and those who don't and F people out of 10 who do not understand hexadecimal c1a2a285948293859940d9a49385a2