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JAEberhart
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Monday, July 10th, 2023 8:09 PM

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CM2000 Internet Dropping or Impossibly Slow

@jake0894 any chance you could share your resolution?

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2 years ago

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JAEberhart

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6 Messages

2 years ago

a couple of screenshots from cloudflare 

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JAEberhart

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6 Messages

2 years ago

Cable Diagnostic
Status:   Poor
Action:  
[Downstream Power Level/Upstream Power Level]
Try these actions (Click the Refresh button after each step):
1) Make sure the coaxial cable is tightly connected.
2) Remove any unnecessary splitters.
3) Replace any required splitters.
4) Contact your service provider for troubleshooting help.
CM Status: 
Downstream Status: 
Upstream Status: 
  Refresh Save Cable Diagnostic Info
 
Advanced Information
Frequency Start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Starting Frequency
 
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 411000000 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 Uncorrectables
1 Locked QAM256 4 411000000 Hz 12.4 dBmV 44.5 dB 0 0
2 Locked QAM256 1 393000000 Hz 12.6 dBmV 45.2 dB 0 0
3 Locked QAM256 2 399000000 Hz 12.4 dBmV 44.8 dB 0 0
4 Locked QAM256 3 405000000 Hz 12.4 dBmV 44.7 dB 0 0
5 Locked QAM256 5 417000000 Hz 12.2 dBmV 45.0 dB 0 0
6 Locked QAM256 6 423000000 Hz 12.1 dBmV 44.8 dB 0 0
7 Locked QAM256 7 435000000 Hz 12.0 dBmV 44.8 dB 0 0
8 Locked QAM256 8 453000000 Hz 11.9 dBmV 44.9 dB 0 0
9 Locked QAM256 9 459000000 Hz 11.9 dBmV 44.9 dB 0 0
10 Locked QAM256 10 465000000 Hz 12.0 dBmV 45.0 dB 0 0
11 Locked QAM256 11 471000000 Hz 12.1 dBmV 45.0 dB 0 0
12 Locked QAM256 12 477000000 Hz 12.1 dBmV 45.0 dB 0 0
13 Locked QAM256 13 483000000 Hz 11.9 dBmV 44.9 dB 0 0
14 Locked QAM256 14 489000000 Hz 11.8 dBmV 44.9 dB 0 0
15 Locked QAM256 15 495000000 Hz 11.6 dBmV 44.8 dB 0 0
16 Locked QAM256 16 501000000 Hz 11.5 dBmV 44.7 dB 0 0
17 Locked QAM256 17 507000000 Hz 11.4 dBmV 44.7 dB 0 0
18 Locked QAM256 18 513000000 Hz 11.4 dBmV 44.7 dB 0 0
19 Locked QAM256 19 519000000 Hz 11.3 dBmV 44.6 dB 0 0
20 Locked QAM256 20 525000000 Hz 11.3 dBmV 44.6 dB 0 0
21 Locked QAM256 21 531000000 Hz 11.2 dBmV 44.6 dB 0 0
22 Locked QAM256 22 537000000 Hz 11.1 dBmV 44.5 dB 0 0
23 Locked QAM256 23 543000000 Hz 10.9 dBmV 44.3 dB 0 0
24 Locked QAM256 24 549000000 Hz 10.7 dBmV 44.2 dB 0 0
25 Locked QAM256 25 555000000 Hz 10.7 dBmV 44.2 dB 0 0
26 Locked QAM256 26 561000000 Hz 10.7 dBmV 44.0 dB 0 0
27 Locked QAM256 27 567000000 Hz 10.7 dBmV 44.1 dB 0 0
28 Locked QAM256 28 573000000 Hz 10.7 dBmV 44.0 dB 0 0
29 Locked QAM256 29 579000000 Hz 10.7 dBmV 44.0 dB 0 0
30 Locked QAM256 30 585000000 Hz 10.6 dBmV 44.0 dB 0 0
31 Locked QAM256 31 591000000 Hz 10.6 dBmV 43.9 dB 0 0
32 Locked QAM256 32 597000000 Hz 10.5 dBmV 43.8 dB 0 0
 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 4 5120 Ksym/sec 16400000 Hz 32.3 dBmV
2 Locked ATDMA 2 5120 Ksym/sec 29200000 Hz 32.3 dBmV
3 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 32.0 dBmV
4 Locked ATDMA 1 5120 Ksym/sec 35600000 Hz 32.3 dBmV
5 Locked ATDMA 5 1280 Ksym/sec 39600000 Hz 29.5 dBmV
6 Not Locked Unknown 0 0 0 0.0 dBmV
7 Not Locked Unknown 0 0 0 0.0 dBmV
8 Not Locked Unknown 0 0 0 0.0 dBmV
 
Downstream OFDM Channels
Channel Lock Status Profile ID Channel ID Frequency Power SNR / MER Active Subcarrier
Number Range		 Unerrored
Codewords		 Correctable
Codewords		 Uncorrectable
Codewords
1 Locked 0 ,1 ,2 ,3 193 690000000 Hz 9.68 dBmV 42.6 dB 1108 ~ 2987 627686352 287925047 0
2 Not Locked 0 0 0 Hz 0 dBmV 0 dB 0 ~ 4095 0 0 0
 
Upstream OFDMA Channels
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV
 
Extended Upstream Transmit Power
 
Current System Time:Wed Jul 12 08:35:07 2023
System Up Time:16:54:57

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JAEberhart

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6 Messages

2 years ago

@EG Good morning and sorry to bother you. You don't happen to have any advice on this stuff do you? Comcast support has pushed me to Netgear, while Netgear to Comcast. Our internet is basically unusable. Comcast was down a few weeks ago for an 'upgrade,' but I'm really not getting anywhere.

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EG

Expert

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108.6K Messages

2 years ago

Hi. This may or may not be the root cause of the problem (YMMV) but it should be addressed regardless.


The downstream power is too high. It may be over-driving the front-end receiver circuit of the modem. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.


Is there a drop amplifier on the coax cable line leading to the modem ? If so, try removing / bypassing it and see. If not, you can try installing a -6 dB forward path-only attenuator pad such as this one on the coax port on the rear of the modem to knock that power level down and see;


https://www.amazon.com/FPA6-54-Forward-Attenuator-DOCSIS-Internet/dp/B08KTRC3XZ  


It won't affect the upstream power level. Good luck !

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JAEberhart

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6 Messages

2 years ago

Yay. Thanks @EG I’ve ordered it. Will update once it’s installed. :-)

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