Community Forum

Upload goes from 12 to 3 and sometimes 6 mbps ...

Xfinity Forum Archive
About the archive project

Xfinity Forum Archive...

This is an archived section of the community.

Content in this area has been identified as outdated or irrelevant.

This change was done in an effort to make the forum easier to use and to keep only the most helpful and recent content active.

Post your questions in the Xfinity Community

Diamond Problem Solver

Re: Upload goes from 12 to 3 and sometimes 6 mbps ...

Ask about those three stats and post back here with what the figures are. They can't be remotely adjusted from their end. Hopefully you get a rep that knows how to query for them and doesn't just make them up.. Good luck !

New Poster

Re: Upload goes from 12 to 3 and sometimes 6 mbps ...

So I should call and ask about My received power level and ask them to adjust them to my modems power ? Can you simplify what I need to do over the phone to make the process easier. I think I got the jist of it anyway I just need to make sure.

Diamond Problem Solver

Re: Upload goes from 12 to 3 and sometimes 6 mbps ...

The stats as read at the modem level at that moment in time were o/k but there are three additional signal stats than can cause it which can't be read by the modem. They can only be read from their end by them polling the CMTS (Cable Modem Termination System) at the local headend facility.

They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.

You can call in and ask what these figures are. The Upstream Receive Power Level should fall within the range of -2dB to +2dB with 0dB being in the middle and perfect.

The Upstream SNR should be least 31dB, and the higher it is the better.

The ICFR should be no higher than 2 dB.

You could have an intermittent noise ingress issue in only the upstream channel(s) / return path only somewhere.

They will be able to see whether or not everything is in the green zone and also see a history plot for the modem.


New Poster

Re: Upload goes from 12 to 3 and sometimes 6 mbps ...

 

Downstream

Index
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Lock Status
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Frequency
657 MHz
663 MHz
669 MHz
675 MHz
681 MHz
687 MHz
693 MHz
699 MHz
705 MHz
711 MHz
717 MHz
723 MHz
729 MHz
735 MHz
741 MHz
747 MHz
SNR
40.946 dB
40.946 dB
40.946 dB
40.946 dB
40.946 dB
40.366 dB
40.946 dB
40.366 dB
40.366 dB
40.946 dB
40.946 dB
40.946 dB
40.946 dB
40.366 dB
40.366 dB
40.366 dB
Power Level
1.200 dBmV
1.100 dBmV
1.100 dBmV
1.000 dBmV
0.800 dBmV
0.700 dBmV
0.800 dBmV
0.900 dBmV
1.100 dBmV
1.200 dBmV
1.000 dBmV
0.900 dBmV
0.700 dBmV
0.500 dBmV
0.300 dBmV
0.000 dBmV
Modulation
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
 
 
-------------------------
 
 
Upstream 
 
 
Index
1
2
3
Lock Status
Locked
Locked
Locked
Frequency
36 MHz
23 MHz
30 MHz
Symbol Rate
5120 KSym/sec
5120 KSym/sec
5120 KSym/sec
Power Level
46.250 dBmV
46.250 dBmV
46.250 dBmV
Modulation
64 QAM
64 QAM
64 QAM
New Poster

Re: Upload goes from 12 to 3 and sometimes 6 mbps ...

One second

Diamond Problem Solver

Re: Upload goes from 12 to 3 and sometimes 6 mbps ...

Click on the second blue colored link that I provided in my reply. That should give you access the user interface pages of the 3941. The *signal* figures / power levels (not the speeds) should be located somewhere in the "Connection Status" area.

New Poster

Re: Upload goes from 12 to 3 and sometimes 6 mbps ...

"Voice and Data Modem"

CISCO DPC3941T

Serial Number: 48F7C0A970B3

 

I just upgraded my speed so I don't know where to find my downstream and upstream

Diamond Problem Solver

Re: Upload goes from 12 to 3 and sometimes 6 mbps ...

What do the modem's signal stats look like ? Try getting them here; http://192.168.100.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

Start with the modem's signal stats. Perhaps they already are, or they are close to being out of spec and intermittently they go completely of spec. Try getting them here http://192.168.100.1 or here http://10.0.0.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

What is the exact make and model number of the modem ?


New Poster

Upload goes from 12 to 3 and sometimes 6 mbps ...

I recently found this post - http://forums.xfinity.com/t5/Your-Home-Network/Upload-Speeds-Randomly-Changing-from-12-Mbps-to-1-Mbp...

 

But looks like he wasn't able to get the help he needed.

 

But here are my test results from speedtest website. I notice they change servers like it's nothing but the comcast speed test is relatively the same everytime I don't believe they're accurate to "live stream" with for the most part. I am here because I drop frames like crazy on OBS.

 

Speed test - http://prntscr.com/hccw78 

 

Xfinity speedtest 

http://speedtest.xfinity.com/results/JA6HF6RKAXVQ5VW - 12 

http://speedtest.xfinity.com/results/JA6HJYFZLM2LTYV - 6 

http://speedtest.xfinity.com/results/JA6HLVZZA3NN8DM

 

I can not keep a steady bitrate because my upload always fluctuates is there anything I can do ? I pay for performance plus/blast service. My current modem - CISCO DPC3941T no router.