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High Power, low SNR, RCS Partial Service

Tuning in

We're currently getting regular internet dropouts, with connection speeds of 5-10mbps instead of our usual 250mbps. When I run the Service Check on the VM website, it says that nothing is wrong.  However, looking at the Hub 3 status, there seem to be a few oddities.  All downstream channels seem to have a power level between 9.9 and 12.4 dBmV - considerably higher that Seth's recommended levels.  In addition, 12 of the 14 channels have a SNR below 34 dB and a fair few post RS errors. The network logs have many RCS Partial Service warnings and Lost MDD Timeouts.

Anyone have any suggestions on the best way to get the issues resolved, please?



Downstream bonded channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

113900000012.327256 qam1
214700000012.332256 qam2
315500000011.630256 qam3
416300000011.430256 qam4
52510000001029256 qam15
625900000010.429256 qam16
726700000010.633256 qam17
827500000010.535256 qam18
928300000010.533256 qam19
1029100000010.531256 qam20
1129900000010.332256 qam21
123070000001035256 qam22
133150000001033256 qam23
143230000009.825256 qam0

Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors


Very Insightful Person
Very Insightful Person

That is one dreadful connection !  VM will need to look at it but it will need a Tech visit.  A VM Person ought to respond here soon.

In the meantime...

Switch the Hub off and unplug it from the mains supply for five minutes. Whilst it's off, do a quick check that all of your coax and ethernet cable connections are in nice and "finger" tight - at the Hub and wall box and also at any connectors etc. Ensure there are no “unterminated cable loose ends. Disconnect all the connections and reconnect to be sure. Also check that the internal wiring is ok with no kinking or chaffing. When its light, check that all looks good with the outside cabling and wall box (no “staples, etc.,) piercing the cables. Then switch the Hub back on and leave ~5 minutes When all done, check back in the settings and ensure that the RS error counts and any upstream T3 errors have all reset to 0. Then check every hour or so to see if they start reappearing - they shouldn't. If they do (particularly the postRS and T3 ones) you have a problem (noise) that only a Tech visit will sort. 



I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired, 2 on WiFi) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's & TP-Link Archer C64 WAP. On Volt 350Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.

Forum Team
Forum Team

Hey DocMN, thank you for reaching out and I am so sorry to hear about this.

I am going to send you a PM so we can look into this for you.

Please look out for my PM. Cheers 

Matt - Forum Team

New around here?

Forum Team
Forum Team

Hey DocMN, thank you for reaching out again and I am glad we have managed to get this resolved for you. 

Please do let us know how the visit goes. Cheers 

Matt - Forum Team

New around here?