2 Messages
getting half of what i pay for in speed
hey yall i have a cm2000 modem and had comcast come out to test the lines he said the lines are good but after he left i did a test again i am getting a weak downstream signal i am only getting 948mbps out of 2000 here is the modem diag
Cable Diagnostic
Status: Poor
Action:
[Downstream 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: Good
Downstream Status: Poor
Downstream Power Level: Poor
Downstream power is poor (-13.6dBmV). The recommended level is between -10dBmV to 10dBmV.
Downstream SNR Level: Good
Upstream Status: Good
Upstream Power Level: Good
Current Time: Wed Jul 31 18:31:49 2024
Startup Procedure
Acquire Downstream Channel: 417000000 Hz Locked
Connectivity State: OK Operational
Boot State: OK Operational
Security: Enabled BPI+
IP Provisioning Mode: Honor MDD IPv6 only
Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 4 417000000 Hz -4.5 44.7 0 0
2 Locked QAM256 1 399000000 Hz -3.5 45.1 1310 696
3 Locked QAM256 2 405000000 Hz -3.8 44.2 604 379
4 Locked QAM256 3 411000000 Hz -3.9 44.4 1378 315
5 Locked QAM256 5 423000000 Hz -4.9 44.5 0 0
6 Locked QAM256 6 429000000 Hz -4.5 44.7 0 0
7 Locked QAM256 7 435000000 Hz -5 44.4 0 0
8 Locked QAM256 8 441000000 Hz -6.1 43.8 0 0
9 Locked QAM256 9 447000000 Hz -5.3 44.2 0 0
10 Locked QAM256 10 453000000 Hz -5.4 44.1 0 0
11 Locked QAM256 11 459000000 Hz -6.1 43.6 0 0
12 Locked QAM256 12 465000000 Hz -6 43.8 0 0
13 Locked QAM256 13 471000000 Hz -6.3 43.4 0 0
14 Locked QAM256 14 477000000 Hz -6.6 43 0 0
15 Locked QAM256 15 483000000 Hz -6.8 43.1 0 0
16 Locked QAM256 16 489000000 Hz -7.7 42.5 0 0
17 Locked QAM256 17 495000000 Hz -7.6 42.5 0 0
18 Locked QAM256 18 501000000 Hz -7.1 42.6 0 0
19 Locked QAM256 19 507000000 Hz -8.6 41.6 1 0
20 Locked QAM256 20 513000000 Hz -9.4 41.2 0 0
21 Locked QAM256 21 519000000 Hz -8.5 41.8 0 0
22 Locked QAM256 22 525000000 Hz -9.4 40.7 0 0
23 Locked QAM256 23 531000000 Hz -10.4 40.2 3 0
24 Locked QAM256 24 537000000 Hz -10.1 40.8 0 0
25 Locked QAM256 25 543000000 Hz -10.6 40 2 0
26 Locked QAM256 26 549000000 Hz -11 39.4 12 0
27 Locked QAM256 27 555000000 Hz -11.3 39.4 59914 95775
28 Locked QAM256 28 561000000 Hz -12.5 38.4 469257 1851685
29 Locked QAM256 29 567000000 Hz -11.7 38.8 68 162
30 Locked QAM256 30 573000000 Hz -11.5 38.6 555318 1881181
31 Locked QAM256 31 579000000 Hz -13.6 37 1886482 7080683
32 Locked QAM256 32 585000000 Hz -13.3 37.4 1714981 6718069
Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 20 5120 Ksym/sec 35600000 Hz 40.0 dBmV
2 Locked ATDMA 18 5120 Ksym/sec 22800000 Hz 37.0 dBmV
3 Locked ATDMA 19 5120 Ksym/sec 29200000 Hz 37.8 dBmV
4 Locked ATDMA 17 5120 Ksym/sec 16400000 Hz 35.5 dBmV
5 Not Locked Unknown 0 0 0 0.0
6 Not Locked Unknown 0 0 0 0.0
7 Not Locked Unknown 0 0 0 0.0
8 Not Locked Unknown 0 0 0 0.0
Downstream OFDM Channels
Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
1 Not Locked 0 0 0 Hz 0 dBmV 0 dB 0 ~ 4095 0 0 0
2 Locked 0 ,1 ,2 ,3 194 957000000 Hz -13.02 dBmV 30.2 dB 148 ~ 3947 11284738589 417875205 10461784442
Upstream OFDMA Channels
Channel LockedStatus ProfileID ChannelID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV
BruceW
Gold Problem Solver
•
25.9K Messages
2 months ago
When we see that the usual cause is a 1 Gigabit device (Ethernet cable? Switch? Network adapter?). To carry 2 Gbps traffic requires components capable of 2.5 Gigabits or higher between the modem and your computer or mobile device, although the downstream signal impairments may also be a cause.
The upstream signals you posted are OK, but the downstream power levels become weaker at the higher frequencies, a condition called "tilt", about half of them are out of spec (too low), and several have far too many uncorrectable errors. Network connection problems like this are often due to poor coax connections or damaged coax cable, usually in or near your home. Running the cable through a surge protector, a defective splitter, or too many splitters can cause signal problems as well. If there is an amplifier in the line make sure it's getting power.
If you want to troubleshoot this yourself, please see Internet Troubleshooting Tips. If you can't find the problem or you'd rather have Comcast take care of it and an employee does not respond to your message here, 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 (approx $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.
ETA: 2 Gbps traffic comments
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.
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