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Upload Speed 1/10th of Plan

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Cheapscot
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Upload Speed 1/10th of Plan

I have the "Deluxe 50" plan and should be getting 10 Mbps upload, but am consistently getting 1 to 1.5 Mbps per Speedtest.net. I have tested over many days. The download speeds are excellent and consistent. 

Accepted Solution

Re: Upload Speed 1/10th of Plan

I have a Zoom 5341J modem. Is this the information you want?

 

Downstream Bonded ChannelsChannel Modulation Frequency Power SNR Correctables Uncorrectables

1QAM256675000000 Hz-9.3 dBmV39.2 dB00
2QAM256663000000 Hz-9.5 dBmV39.2 dB00
3QAM256669000000 Hz-9.4 dBmV39.3 dB00
4QAM256681000000 Hz-8.8 dBmV39.4 dB00
5QAM256687000000 Hz-8.3 dBmV39.7 dB00
6QAM256693000000 Hz-7.9 dBmV39.7 dB00
7QAM256699000000 Hz-7.1 dBmV39.8 dB00
8QAM256717000000 Hz-6.8 dBmV40.3 dB00

 

Total Correctables Total Uncorrectables

00



Upstream Bonded ChannelsChannel US Channel Type Symbol Rate Frequency Power

1ATDMA5120 Ksym/sec34800000 Hz45.5 dBmV
2ATDMA5120 Ksym/sec27900000 Hz44.8 dBmV
3ATDMA5120 Ksym/sec21000000 Hz44.5 dBmV
4Unknown0 Ksym/sec0 Hz0.0 dBmV

 

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Accepted Solution

Re: Upload Speed 1/10th of Plan

While Comcast support confirmed that my upload signal was low I decided to do a bit more troubleshooting before having a tech come out. Testing directly from multiple devices and directly off the router did not show a problem - so it was isolated to one PC. That PC has an ASRock motherboard and a utility app installed called xFast Lan (it comes on the driver disc for the MB). Removing that program fixed the problem. It appears to be a known issue with ASRock utilities:

http://www.tomshardware.com/answers/id-1845066/slow-upload-speed-computer.html

 

Thanks all for the support.

 

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8 REPLIES
Trusted Forum Contributor

Re: Upload Speed 1/10th of Plan

Hello Cheapscot and welcome,

 

Can you post your Comcast Gateway's upload/download, SNR power signaling values for the Forum Community  to see and assist with your diagnosis?

 

Look forward to hearing from you... 

 

Cheapscot
Visitor

Re: Upload Speed 1/10th of Plan

I have a Zoom 5341J modem. Is this the information you want?

 

Downstream Bonded ChannelsChannel Modulation Frequency Power SNR Correctables Uncorrectables

1QAM256675000000 Hz-9.3 dBmV39.2 dB00
2QAM256663000000 Hz-9.5 dBmV39.2 dB00
3QAM256669000000 Hz-9.4 dBmV39.3 dB00
4QAM256681000000 Hz-8.8 dBmV39.4 dB00
5QAM256687000000 Hz-8.3 dBmV39.7 dB00
6QAM256693000000 Hz-7.9 dBmV39.7 dB00
7QAM256699000000 Hz-7.1 dBmV39.8 dB00
8QAM256717000000 Hz-6.8 dBmV40.3 dB00

 

Total Correctables Total Uncorrectables

00



Upstream Bonded ChannelsChannel US Channel Type Symbol Rate Frequency Power

1ATDMA5120 Ksym/sec34800000 Hz45.5 dBmV
2ATDMA5120 Ksym/sec27900000 Hz44.8 dBmV
3ATDMA5120 Ksym/sec21000000 Hz44.5 dBmV
4Unknown0 Ksym/sec0 Hz0.0 dBmV

 

Trusted Forum Contributor

Re: Upload Speed 1/10th of Plan

No, we need to have either your Business Class (BC) SMCD3g, or NetGear3000DCR, or DPC3939B Comcast Gateway (CG) information. I do not believe Zoom 5341J modem is a supported BC CG. 

Cheapscot
Visitor

Re: Upload Speed 1/10th of Plan

Comcast does support it - at least that's what I was told when I signed up. I guess I will have to wait until Monday and call technicall support. Thanks anyway!

Trusted Forum Contributor

Re: Upload Speed 1/10th of Plan


Cheapscot wrote:

Comcast does support it - at least that's what I was told when I signed up. I guess I will have to wait until Monday and call technicall support. Thanks anyway!


Well, it's not technically on the supported device list at http://mydeviceinfo.comcast.net .

Forum Contributor

Re: Upload Speed 1/10th of Plan

Trusted Forum Contributor

Re: Upload Speed 1/10th of Plan


tmittelstaedt wrote:

 

For $9 I think you can buy a supported modem ;-)

 

http://www.ebay.com/itm/SMC-model-SMCD3G-CCR-Business-Class-Cable-Modem-with-4-port-router-Comcast-/...


Meh, contraband. I doubt Comcast would activate such a device, and even if they would, the device would likely get swept up in an audit, possibly leading to service termination.

Cheapscot
Visitor

Re: Upload Speed 1/10th of Plan

While Comcast support confirmed that my upload signal was low I decided to do a bit more troubleshooting before having a tech come out. Testing directly from multiple devices and directly off the router did not show a problem - so it was isolated to one PC. That PC has an ASRock motherboard and a utility app installed called xFast Lan (it comes on the driver disc for the MB). Removing that program fixed the problem. It appears to be a known issue with ASRock utilities:

http://www.tomshardware.com/answers/id-1845066/slow-upload-speed-computer.html

 

Thanks all for the support.

 

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