Regular Visitor
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10 Messages
Internet Speeds
I regularly test my download speeds as you can see by the pictures below. I have no answer to why I've gone from 400+mpbs download to 80 to 95mbps. As you can see, on the 03/04/20 my speeds were excellent. What changed? I rebooted my modem. That's it. Yet, now they've dropped to under 100mbps again. The Uncorrectables seems to me to be excessive. Thoughts? Ideas?
BruceW
Gold Problem Solver
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26.5K Messages
5 years ago
The images you posted aren't visible. They all look like this:
This is probably because the images require moderator approval. That could take a while. You could upload the images to a file sharing site and post links to them here, or post text instead of an image.
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Retsailor2009
Regular Visitor
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10 Messages
5 years ago
Going to try again with text and a link.
Netgear C7800 Modem Docsis 3.1
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 561000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security ENABLED BPI+
IP Provisioning Mode Honor MDD IPv6 only
Starting Frequency
561000000
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 561000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security ENABLED BPI+
IP Provisioning Mode Honor MDD IPv6 only
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectabables
1 Locked QAM256 17 561000000Hz 8.0 dBmV 38.2 dB 2503 3900
2 Locked QAM256 1 459000000 Hz 7.0 dBmV 38.5 dB 883 799
3 Locked QAM256 2 465000000 Hz 7.3 dBmV 38.6 dB 0 0
4 Locked QAM256 3 471000000 Hz 7.9 dBmV 38.5 dB 24 0
5 Locked QAM256 4 477000000 Hz 8.2 dBmV 38.5 dB 68 57
6 Locked QAM256 5 483000000 Hz 8.5 dBmV 38.7 dB 106 279
7 Locked QAM256 6 489000000 Hz 8.3 dBmV 38.4 dB 434 521
8 Locked QAM256 7 495000000 Hz 8.4 dBmV 38.4 dB 1008 1565
9 Locked QAM256 8 507000000 Hz 8.4 dBmV 38.5 dB 4086 6122
10 Locked QAM256 9 513000000 Hz 8.2 dBmV 38.4 dB 21612 11783
11 Locked QAM256 10 519000000 Hz 8.1 dBmV 38.2 dB 82245 22629
12 Locked QAM256 11 525000000 Hz 8.0 dBmV 38.2 dB 215151 26504
13 Locked QAM256 12 531000000 Hz 7.8 dBmV 38.0 dB 553996 13626
14 Locked QAM256 13 537000000 Hz 7.9 dBmV 38.1 dB 777029 9593
15 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
16 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
17 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
18 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
19 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
20 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
21 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
22 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
23 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
24 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
25 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
26 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
27 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
28 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
29 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
30 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
31 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 1 5120 Ksym/sec 35700000Hz 39.5 dBmV
2 Locked ATDMA 2 5120 Ksym/sec 29200000Hz 40.5 dBmV
3 Locked ATDMA 3 5120 Ksym/sec 22700000Hz 41.0 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 16200000Hz 40.5 dBmV
5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV
Downstream OFDM Channels
Channel Channel ID Indicator Subcarrier Zero Frequency Active Subcarrier Number Range Total Codewords Uncorrectable Codewords
1 159 Non-Primary 617600000 Hz 1246 ~ 2849 16029950081 0
2 0 Other 0 Hz 0 ~ 0 0 0
Upstream OFDMA Channels
Channel UpstreamIsMuted Ranging Status Subcarrier Zero Frequency Active Subcarrier Number Range Symbols Per Frame Tx Power
1 Other 0 Hz 0 ~ 0 0 0 dBmV 0 0 dBmV
2 Other 0 Hz 0 ~ 0 0 0 dBmV 0 0 dBmV
https://www.speedtest.net/results?sh=b22690b429d94650828fbe4a01938aeb
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BruceW
Gold Problem Solver
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26.5K Messages
5 years ago
It seems odd that only 14 of 32 downstream channels are showing up. If I saw that on my modem I'd look over https://forums.xfinity.com/t5/Internet/ANSWERED-Troubleshooting-Gigabit-Internet-Speeds/ta-p/3150588 and https://forums.xfinity.com/t5/Your-Home-Network/Gigabit-speed-troubleshooting-video/m-p/3310454#M316654 and, if those didn't help, I'd have a Comcast tech out.
To set that up 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/. If they can't fix the problem remotely (unlikely), 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.
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