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My problem seems identical to the one described in this post: https://forums.xfinity.com/t5/Your-Home-Network/Extremely-slow-upload-speeds/td-p/3059871
I have the 300/25 service. My only issue is that the upload speed is consistently <40% of what is advertised; consistently in the 6-8 Mbps range when I typically use the internet. It's 10am on a workday, when I'd normally be at work, and I'm seeing 11 Mbps for the first time ever; reported by Speedtest.Xfinity.com and Fast.com. This is a real problem, as I want to stream video with my calls to friends and family in the evenings but ~7Mbps is a bottleneck. I recently upgraded form the XB3 (TG1682G) modem/router to a Netgear CM1150V for other reasons and the upload issue persists.
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Here are the results of being attached directly to the incoming coax line for the house.
Per our discussions:
Downstream Power Levels: -8dBmV to +10dBmV
Office: Currently too low at -11.4 to -9.0
PoE: On the high side. 7 to 10.1
Downstream Signal to Noise Ratio (SNR): >35dB
Office: fine.
PoE: fine. 40.9 to 41.6 dB
Upstream Power Level: +25dBmV to +50dBmV
Office: Too high, +55.5
PoE: fine. 40.5 dBmV.
Notably, I ran a speed test connected to the modem and had the same results as I have in the office. 360 down, ~10 up. Do you think this is sufficient for Comcast to investigate the matter without charging me?
@CnSWEST wrote:Here are the results of being attached directly to the incoming coax line for the house.
Per our discussions:
Downstream Power Levels: -8dBmV to +10dBmV
Office: Currently too low at -11.4 to -9.0
PoE: On the high side. 7 to 10.1
Downstream Signal to Noise Ratio (SNR): >35dB
Office: fine.
PoE: fine. 40.9 to 41.6 dB
Upstream Power Level: +25dBmV to +50dBmV
Office: Too high, +55.5
PoE: fine. 40.5 dBmV.
Notably, I ran a speed test connected to the modem and had the same results as I have in the office. 360 down, ~10 up. Do you think this is sufficient for Comcast to investigate the matter without charging me?
Can't see your picture just yet.
+7 to +10.1 is still on the high side but ok for being at PoE. Other than not knowing the uSNR nor the Upstream Receive Power currently, especially from the PoE, everything else seems fine from PoE indicating the problem could be inside as you are losing way too much from PoE to office. Are there any splitters that are not needed or are the connections tight?
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If the tech finds the problem to be on your side of the demarcation point, you will likely be charged.
Some stuff that you can try before you call;
In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test
If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
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After following EG’s steps, at that point since the slow uploads are happening at PoE, then it may be better to have a tech out to investigate. However the office will be one thing they will point out as well by saying there’s too much loss going there but since the issue happens at PoE, without knowing the uSNR or Upstream Receive Power, the issue may be beyond your premises
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Dead thread from last year now being closed.
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