Visitor
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5 Messages
Download speeds: great! Upload speeds: abyssmal... :(
Using a MB8600 (an approved 3p Docsis 3.1 modem). For a long time (in the tune of years), I was getting about 10-12Mbps upload on my current plan.
This past week, I'm averaging most of the time around < 1Mbps (like 0.3 - 0.5).
As a gamer and a WFH employee, I need my upload speeds back...😭
Troubleshooting performed:
- Reboot Modem
- Reboot router (just in case; download speeds are in fact, just fine)
- changed wireless / wired
- tested during various times of day and night
- No listed outages
- tracert capture was inconclusive but it did seem to "struggle" the most between my router/modem and the next few hops along the way to UW (picked somewhere close)
(EDIT: I'm about ready to submit this and a final speed test gave me 11Mbps peak for upload... 🙄)
(EDIT2: And back to <1 Mbps)
BruceW
Gold Problem Solver
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25.8K Messages
3 years ago
Are you connecting via Wifi or Ethernet? If Wifi, it's best to switch to an Ethernet cable connection if possible for testing. That would allow you to determine whether the problem is the Wifi signal or the link between your modem or gateway and Comcast's network. 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):
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 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.
Note: Be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post, the author of the post you are Commenting on is notified of your response. But if you Reply, the author of the post you are Replying to is NOT notified and may not be aware of your response.
(edited)
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EG
Expert
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105.6K Messages
3 years ago
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 copy all of the text of the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers and paste them into your next post.
What is the exact make and model number of the modem ?
Are there any modem component RF error log entries being shown ? If so, please post them as well in their entirety (copy and paste them, don't post a screenshot) but redact the CM MAC and the CMTS MAC addresses for your privacy. They are considered to be personal information. Personally identifying information is a violation of their forum guidelines. The forum bot will not allow your post to be seen publically.
Please also post (copy and paste) the text output of a traceroute to google.com
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Len5
Contributor
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21 Messages
3 years ago
Not sure this will help but recently I was having the same issue, great d/l speed, terrible u/l. After six tech visits, two supervisor visits, and two bucket trucks, the last tech finally figured out it was due to a faulty amplifier in the cable. Tech didn't think we needed it any more so he removed it and wham, everything back to normal. Note: This entire process took about six weeks.
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Voidwalkergirl
Visitor
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5 Messages
3 years ago
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Voidwalkergirl
Visitor
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5 Messages
3 years ago
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BruceW
Gold Problem Solver
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25.8K Messages
3 years ago
The downstream power levels and SNR, and the upstream power levels all look OK, but the event log entries indicate the modem is having problems communicating with Comcast's network. You should have one of their premise techs out to diagnose and correct the problem.
(edited)
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