06-12-2012 05:08 PM
Last week I decided to upgrade my Performance internet connection to Blast, hoping to see an increase in speed. The first thing I did after going to Blast was upgrade my modem from the Motorola SB5101 to the Motorola SB6121, because that is one of the DOCSIS 3.0 modems that Comcast has approved.
I ran ShaperProbe when I had Performance internet and after I upgraded everything, but my results are the same (no increase in speeds). I called Comcast up and spoke to a tech who had me run speedtest.net, and then told me that my speeds were what I should be getting.
I tried to explain what my ShaperProbe results were, but she wasn't able to understand. Am I missing something (and losing money) with this upgrade?
ShaperProbe (Performance Internet/SB5101):
Upstream: 4259 Kbps.
Downstream: 23557 Kbps.
Upstream: Burst size: 4837-4915 KB;
Shaping rate: 2128 Kbps.
Downstream: Burst size: 9678-10084 KB;
Shaping rate: 15978 Kbps.
ShaperProbe (Blast Internet/SB6121):
Upstream: 4254 Kbps.
Downstream: 25937 Kbps.
Upstream: Burst size: 4978-5058 KB;
Shaping rate: 2090 Kbps.
Downstream: Burst size: 9564-10103 KB;
Shaping rate: 15978 Kbps.
Solved! Go to Solution.
06-12-2012 05:17 PM - edited 06-12-2012 05:29 PM
You seem to have a former "Blast" speed tier (used to be 16/2 sustained) config file in the modem. In many areas that is the speed of the "Performance" tier, it's 12/2 in others. If you are in an upgraded to DOCSIS 3 area "Blast" should be 25/4.
The provisioning in their database and the correct file needs to be pushed to the modem. If you can't get any satisfaction from the phone reps try shooting a private message to Comcast Steve here;
He will get this straightened out.
06-12-2012 05:24 PM
Thank you for the quick reply. I do live in a DOCSIS 3 area (I checked the map at http://broadbandmap.gov/technology and even confirmed with the customer service agent on the phone).
From what you've said, it sounds like I should be getting the 25/4. Should I just call back and hope I can get someone who will understand what I'm saying?
06-12-2012 05:31 PM - edited 06-12-2012 05:32 PM
As I said, if you can't get any joy, send a PM to Comcast Steve during regular business hours.
Just to check if you have D3, is the DS (downstream) light on the modem colored blue ?
06-12-2012 05:37 PM
Yes, both DS and US lights are blue.
So you have both downstream and also upstream multiple channel bonding on your local system ! Good luck with it !!
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