Unfortuantly Virgin media is superglued together and the number of connections and demand to a CMT changes its min/max power limits on what is too high and is too low and also what Hub/modem you have.
As a general "what you would like to see as your power levels" it would be.
Downstream between -3dBmv to +7dBmv
Upstream between 35dBmv to 55dBmv
However It is quite possible to have power levels outside of these limits and have no issues... You having -6dBmv downstream is "going by the rule book" too low... This would affect SNR also.
If you have a silver block on the back of your superhub where the coax cable screws in that is called an "attenuator" then this can be removed easily to increase power levels, there is a value writen on them saying how much it is reducing the power level by in dBmv (E.G. 6dBmv)... If you do not have one and your power levels are too low (wait for admin to say so) for your CMT then and engineer will be called out to alter/change tap points in the cab on the street.
Really helpful. Unfortunately no silver block to remove and I have the Hub 3.0.
Just trying to work out whether this issue is the connection itself or contention. From other posts in the area (Richmond) it seems to be a particularly bad problem in the surrounding area - is there a way to check this?
Pretty disappointing for a 200mb service, but tonight I'm getting about 10mb and streaming video isn't even working properly!
Thanks for taking the time to post on the community.
Sorry to read that you are having issues with your broadband connection.
I've managed to locate your account and there is an SNR (signal to noise ratio) fault in your area which is causing intermittent connection. The reference number is F004861737 and with a review date of 14th November. There is also maintenance being completed in your area today.
Once the SNR fault has been closed down I will take another look at your connection and if there are any issues with the line, I can arrange an engineer appointment.
With the power levels, the downstream range is between -6 dBmV and +10 dBmV and with the upstream anything under 51 dBmV is acceptable. Hope that helps.