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4 Messages

Friday, September 16th, 2022 1:16 AM

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Periodic disconnects due to very slow upload speeds

Since last week every 1-2h my upload speed goes to 0 (Speedtest ends up at 0.02Mbps) while the download is full bandwidth. I confirmed slow upload speeds on 3 different devices, 2 operating systems, including lan and wifi, and also ethernet connected directly to the modem (Zoom 5345). This ends up disconnecting my devices which cannot access internet.

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Visitor

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4 Messages

4 years ago

These are the values while the internet is working fine:

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 4 459000000 Hz 5.5 dBmV 39.7 dB 0 0
2 Locked QAM256 5 465000000 Hz 5.7 dBmV 39.5 dB 1 0
3 Locked QAM256 6 471000000 Hz 5.7 dBmV 39.6 dB 1 0
4 Locked QAM256 7 477000000 Hz 5.7 dBmV 39.5 dB 2 0
5 Locked QAM256 8 483000000 Hz 4.9 dBmV 39.1 dB 13 0
6 Locked QAM256 9 489000000 Hz 5.2 dBmV 39.4 dB 15 0
7 Locked QAM256 10 495000000 Hz 5.3 dBmV 39.4 dB 15 0
8 Locked QAM256 11 507000000 Hz 5.8 dBmV 39.0 dB 21 0
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 10 5120 Ksym/sec 35600000 Hz 44.5 dBmV
2 Locked ATDMA 6 2560 Ksym/sec 10400000 Hz 47.5 dBmV
3 Locked ATDMA 7 5120 Ksym/sec 16400000 Hz 46.5 dBmV
4 Locked ATDMA 8 5120 Ksym/sec 22800000 Hz 45.3 dBmV

Problem Solver

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406 Messages

Hi, @user_611c69! I'm sorry to hear about these issues concerning your upload speed. We can definitely dig into this further. Please send us a private message, utilizing the following steps, to get started. 

Click "Sign In" if necessary

 • Click the "Peer to peer chat" icon (upper right corner of this page)

 • Click the "New message" (pencil and paper) icon

 • Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list

 • Type your message in the text area near the bottom of the window

 • Press Enter to send your message

 

We'll continue assisting you there! 

I no longer work for Comcast.

Gold Problem Solver

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27.4K Messages

4 years ago

... my upload speed goes to 0 ... (Zoom 5345). ...

Perhaps not the cause of the problem, but you should be aware that the Zoom 5345 is no longer approved for use with their Internet service. See https://www.xfinity.com/support/devices.

The signals you posted look good. The connection drops are most likely due to an intermittent noise or connection problem. Network connection problems that affect both Ethernet and Wifi devices are often due to poor coax connections or damaged coax cable, usually in or near your home. If you want to troubleshoot this yourself, please see Internet Troubleshooting Tips. If you still need help, please post your Internet plan speed and the following information from your modem (from http://192.168.100.1):

  • event log (Be sure to remove or blot out any MAC addresses. Forum security processing considers them "personal information" and may prevent the event log from posting if these are present.)

If you can't find the problem or you'd rather have Comcast take care of it, call them at the phone number on your bill or 1-800-Comcast, or use one of the options on https://www.xfinity.com/support/contact-us/. It's not likely they can fix the problem remotely. If not, insist they send a tech out to identify the cause and correct it.

If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit ($70-$100) unless you have their Service Protection Plan ( https://www.xfinity.com/support/articles/service-protection-plan, closed to customers that don't already have it). If the trouble is due to a faulty Comcast rental device or anything outside your home you shouldn't be charged.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

(edited)

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