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Cable connection issues on Comcast/Xfinity with CBR750
Hello. I am using the Orbi CBR750 modem/router mesh combo with one RBS750 satellite, and Comcast/Xfinity as my ISP. Starting this morning, I have been experiencing strange issues with my connection. For reference, I bought the Orbi kit on 11-25-2022 and the date of my last config file is 12-4-2022, which until today was the last time I made any configuration changes. (I can't tell you what the previously installed FW was before today, but this might help.)
My network had been working fine from 12-4-2022 until just today 1-23-2023 with no outages or slowdowns that I am aware of. But suddenly this morning when I woke up, my phone wouldn't connect to WiFi, nor would my smart TV, nor would my PlayStation, all of which use the 5GHz WiFi channel on my network. Weirdly enough, devices that use only 2.4GHz (like the Nintendo Switch) seemed unaffected. So the first thing I did was to log in to the online gateway on my desktop and reboot everything. After doing so, I also checked to see if there were any firmware updates, which there were, so I installed those as well, before rebooting everything again. So now my current firmware version on the CBR750 is V4.6.14.4 and the FW version on my RBS750 is V4.6.14.3. However, right after the firmware update, I noticed something curious when returning to the Basic Home screen. Namely, under "Cable Connection" there is now a yellow caution saying "Status: Poor." This, despite everything seemingly working normally again. When I click on the page for details, it says something about my Downstream signal being weak, which I've never seen before. Nothing at all about my setup has changed from 7 weeks ago when I first set up my network, save for this new firmware update today.
I have rebooted my modem several times, to no avail. I ran ipconfig and did release/renew as admin. I have also disconnected all wires, including power, coaxial, and Ethernet, and then reconnected them again. There is no damage to any of the cords, everything is pristine. I am not using any splitters, attenuators, or adapters of any kind that could weaken the signal.. My coaxial cable connection goes directly from the wall to my modem with nothing in between.
For what it's worth, my WiFi does seem to work for now. Neverthless, this caution message worries me, so I tried calling Comcast/Xfinity to see if they might be able to re-provision the modem, because in the past when I had issues on another Netgear device, this always seemed to fix things if a simple reboot didn't already. However, when I called them they said they were unable to detect an attached device. From their end, it looks like I do not have a modem connected! Thus, they cannot send a reset signal. They said it could possibly be a line issue, but they seemed baffled as well. They scheduled me for an appointment with a technician this Thursday.
What's weird is, aside from these error messages, everything is pretty much working fine. That is, the devices that couldn't connect this morning are now connected and working again. However, the gateway page still says "Cable Connection Status: Poor" and my ISP still can't detect my modem, even though it's online. It shows the status as being disconnected, even though it clearly isn't.
As an aside, I've just read the note that had been pinned to the forum a few days ago by user "FURRYe38" about a known issue with Comcast/Xfinity apparently splitting its 1Gbps speed tier into either 800Mbps or 1.2Gbps in some areas and how this is causing issues for some users, but that isn't the case with my account. When I called and spoke with a Comcast/Xfinity today they were able to confirm that I still have 1Gbps down and 20Mbps up as my active plan, and the tier has not been split way in my area. So that doesn't seem to be the source of the problem in my case. Logs incoming...
Here is the information shown on the "Cable Connection" page:
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. Internet Access: 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 507000000 Hz Locked Connectivity State Ok Operational Boot State Ok Operational Security Enabled BPI+ IP Provisioning Mode Honor MDD honorMdd(4) Downstream Bonded Channels Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectable 1 Locked QAM 256 14 489000000 Hz 9.6 dBmV 40.3 dB 0 0 2 Locked QAM 256 15 495000000 Hz 9.6 dBmV 40.3 dB 0 0 3 Locked QAM 256 16 501000000 Hz 9.8 dBmV 40.3 dB 0 0 4 Locked QAM 256 17 507000000 Hz 9.8 dBmV 40.3 dB 0 0 5 Locked QAM 256 18 513000000 Hz 9.9 dBmV 40.3 dB 0 0 6 Locked QAM 256 19 519000000 Hz 10.0 dBmV 40.9 dB 2 0 7 Locked QAM 256 20 525000000 Hz 10.0 dBmV 40.3 dB 0 0 8 Locked QAM 256 21 531000000 Hz 10.0 dBmV 40.3 dB 0 0 9 Locked QAM 256 22 537000000 Hz 10.0 dBmV 40.3 dB 0 0 10 Locked QAM 256 23 543000000 Hz 10.0 dBmV 40.3 dB 0 0 11 Locked QAM 256 24 549000000 Hz 10.0 dBmV 40.3 dB 0 0 12 Locked QAM 256 25 555000000 Hz 10.0 dBmV 40.3 dB 0 0 13 Locked QAM 256 26 561000000 Hz 10.0 dBmV 40.9 dB 0 0 14 Locked QAM 256 27 567000000 Hz 10.0 dBmV 40.3 dB 0 0 15 Locked QAM 256 28 573000000 Hz 10.1 dBmV 40.3 dB 0 0 16 Locked QAM 256 29 579000000 Hz 10.1 dBmV 40.3 dB 0 0 17 Locked QAM 256 30 585000000 Hz 10.4 dBmV 38.9 dB 0 0 18 Locked QAM 256 31 591000000 Hz 10.4 dBmV 40.9 dB 0 0 19 Locked QAM 256 32 597000000 Hz 10.5 dBmV 40.3 dB 0 0 20 Locked QAM 256 33 603000000 Hz 10.9 dBmV 40.3 dB 0 0 21 Locked QAM 256 34 609000000 Hz 10.9 dBmV 40.3 dB 0 0 22 Locked QAM 256 35 615000000 Hz 11.0 dBmV 40.3 dB 0 0 23 Locked QAM 256 36 621000000 Hz 11.3 dBmV 38.9 dB 0 0 24 Locked QAM 256 37 627000000 Hz 11.3 dBmV 38.9 dB 0 0 25 Locked QAM 256 38 633000000 Hz 11.3 dBmV 38.9 dB 0 0 26 Locked QAM 256 39 639000000 Hz 11.1 dBmV 38.9 dB 0 0 27 Locked QAM 256 40 645000000 Hz 11.1 dBmV 38.9 dB 0 0 28 Locked QAM 256 41 651000000 Hz 11.0 dBmV 38.9 dB 0 0 29 Locked QAM 256 42 657000000 Hz 11.0 dBmV 38.9 dB 0 0 30 Locked QAM 256 43 663000000 Hz 11.0 dBmV 40.3 dB 0 0 31 Locked QAM 256 44 669000000 Hz 11.0 dBmV 40.3 dB 0 0 32 Not Locked N/A N/A 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 4 5120 Ksym/sec 16400000 Hz 43.5 dBmV 2 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 43.8 dBmV 3 Locked ATDMA 2 5120 Ksym/sec 29200000 Hz 44.3 dBmV 4 Locked ATDMA 1 5120 Ksym/sec 35600000 Hz 44.8 dBmV 5 Locked ATDMA 5 1280 Ksym/sec 39600000 Hz 45.3 dBmV 6 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV 7 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV 8 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV Downstream OFDM Channels Channel Lock Status Modulation/Profile ID Channel ID Frequency Power SNR/MER Active Subcarrier Number Range Unerrored Codewords Correctable Codewords Uncorrectable Codewords 1 Locked 3 45 690000000 Hz 11.3 dBmV 41.8 dB 1108~2987 0 0 0 2 Not Locked 0 0 0 Hz 0.0 dBmV 0.0 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 0.0 dBmV 2 Not Locked 0 0 0 Hz 0.0 dBmV Current System Time: Mon Jan 23 16:37:26 2023 System Up Time 03:03:19
And here is the information shown on the "Event Log" page:
Event Log Clear Log Refresh Time Priority Description Jan 19 2023 17:18:16 Notice (6) CM-STATUS message sent. Event Type Code: 24 Jan 19 2023 17:18:16 Notice (6) CM-STATUS message sent. Event Type Code: 24 Jan 19 2023 17:18:16 Notice (6) CM-STATUS message sent. Event Type Code: 24 Jan 19 2023 17:18:16 Notice (6) CM-STATUS message sent. Event Type Code: 24 Jan 19 2023 17:18:16 Notice (6) CM-STATUS message sent. Event Type Code: 24 Jan 19 2023 17:18:16 Notice (6) CM-STATUS message sent. Event Type Code: 24 Jan 19 2023 17:18:16 Notice (6) CM-STATUS message sent. Event Type Code: 24 Jan 20 2023 05:01:44 Alert (2) CM Certificate Error Jan 22 2023 04:45:12 Notice (6) DS profile config update. DS Chan ID: 45. Jan 22 2023 04:49:45 Notice (6) CM-STATUS message sent. Event Type Code: 5 Jan 22 2023 05:01:31 Alert (2) CM Certificate Error Jan 23 2023 04:06:53 Critical (3) No Ranging Response received - T3 time-out Jan 23 2023 05:01:36 Alert (2) CM Certificate Error Time Not Established Critical (3) No Ranging Response received - T3 time-out Time Not Established Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW Jan 23 2023 12:09:04 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1 Jan 23 2023 12:09:04 Notice (6) TLV-11 - unrecognized OID Jan 23 2023 12:09:04 Critical (3) Config File Rejected due to Invalid or Unexpected TLV 11 Jan 23 2023 12:09:14 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW Jan 23 2023 12:09:22 Alert (2) CM Certificate Error Time Not Established Critical (3) No Ranging Response received - T3 time-out Time Not Established Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW Jan 23 2023 12:29:10 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1 Jan 23 2023 12:29:10 Notice (6) TLV-11 - unrecognized OID Jan 23 2023 12:29:10 Critical (3) Config File Rejected due to Invalid or Unexpected TLV 11 Jan 23 2023 12:29:20 Warning (5) RCS Partial Service Jan 23 2023 12:29:20 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW Jan 23 2023 12:29:29 Alert (2) CM Certificate Error Jan 23 2023 12:29:31 Notice (6) CM-STATUS message sent. Event Type Code: 4 Jan 23 2023 13:07:25 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1 Jan 23 2023 13:07:25 Notice (6) TLV-11 - unrecognized OID Jan 23 2023 13:07:25 Critical (3) Config File Rejected due to Invalid or Unexpected TLV 11 Jan 23 2023 13:07:31 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW Jan 23 2023 13:07:40 Alert (2) CM Certificate Error Time Not Established Critical (3) No Ranging Response received - T3 time-out Jan 23 2023 13:14:41 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1 Jan 23 2023 13:14:41 Notice (6) TLV-11 - unrecognized OID Jan 23 2023 13:14:41 Critical (3) Config File Rejected due to Invalid or Unexpected TLV 11 Jan 23 2023 13:14:46 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW Jan 23 2023 13:14:53 Alert (2) CM Certificate Error Time Not Established Critical (3) No Ranging Response received - T3 time-out Jan 23 2023 13:35:48 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1 Jan 23 2023 13:35:48 Notice (6) TLV-11 - unrecognized OID Jan 23 2023 13:35:48 Critical (3) Config File Rejected due to Invalid or Unexpected TLV 11 Jan 23 2023 13:35:57 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW Jan 23 2023 13:36:05 Alert (2) CM Certificate Error
Re: Cable connection issues on Comcast/Xfinity with CBR750
You're getting that not because your levels are low but because they're to high. It should be between -7.5 and 7.5dbmv. You're over 11. So its to hot coming into the modem. The log is indicating that as well.
You could try putting a double or triple spliter in line (make sure to cap off the other coax ends) to see if it drops the levels a bit.
Re: Cable connection issues on Comcast/Xfinity with CBR750
Thank you both for responding. Forgive my ignorance on the subject, but is it the upstream, downstream, or both on which the power is too high?
Also, I did do a FULL factory reset this morning, and other than the login, SSID, and password, I left all other settings at default just to rule things out. This is what the logs show now:
Cable Connection:
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.
Internet Access:
Downstream Status:
Upstream Status:
RefreshSave 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
405000000 Hz
Locked
Connectivity State
Ok
Operational
Boot State
Ok
Operational
Security
Enabled
BPI+
IP Provisioning Mode
Honor MDD
honorMdd(4)
Downstream Bonded Channels
Channel
Lock Status
Modulation
Channel ID
Frequency
Power
SNR
Correctables
Uncorrectable
1
Locked
QAM 256
1
405000000 Hz
8.9 dBmV
40.9 dB
0
0
2
Locked
QAM 256
2
411000000 Hz
9.0 dBmV
40.9 dB
0
0
3
Locked
QAM 256
3
417000000 Hz
9.1 dBmV
40.3 dB
3
0
4
Locked
QAM 256
4
423000000 Hz
9.1 dBmV
40.3 dB
0
0
5
Locked
QAM 256
5
429000000 Hz
9.4 dBmV
40.3 dB
0
0
6
Locked
QAM 256
6
435000000 Hz
9.4 dBmV
40.3 dB
10
0
7
Locked
QAM 256
7
441000000 Hz
9.6 dBmV
40.9 dB
0
0
8
Locked
QAM 256
8
453000000 Hz
9.6 dBmV
40.3 dB
0
0
9
Locked
QAM 256
9
459000000 Hz
9.5 dBmV
40.9 dB
0
0
10
Locked
QAM 256
10
465000000 Hz
9.5 dBmV
40.3 dB
3
0
11
Locked
QAM 256
11
471000000 Hz
9.6 dBmV
40.9 dB
0
0
12
Locked
QAM 256
12
477000000 Hz
9.6 dBmV
40.9 dB
0
0
13
Locked
QAM 256
13
483000000 Hz
9.6 dBmV
40.9 dB
0
0
14
Locked
QAM 256
14
489000000 Hz
9.5 dBmV
40.3 dB
0
0
15
Locked
QAM 256
15
495000000 Hz
9.6 dBmV
40.9 dB
0
0
16
Locked
QAM 256
16
501000000 Hz
9.8 dBmV
40.3 dB
0
0
17
Locked
QAM 256
17
507000000 Hz
9.8 dBmV
40.3 dB
0
0
18
Locked
QAM 256
18
513000000 Hz
9.9 dBmV
40.9 dB
0
0
19
Locked
QAM 256
19
519000000 Hz
9.9 dBmV
40.3 dB
0
0
20
Locked
QAM 256
20
525000000 Hz
10.0 dBmV
40.3 dB
0
0
21
Locked
QAM 256
21
531000000 Hz
9.9 dBmV
40.3 dB
0
0
22
Locked
QAM 256
22
537000000 Hz
9.9 dBmV
40.3 dB
0
0
23
Locked
QAM 256
23
543000000 Hz
9.9 dBmV
40.3 dB
0
0
24
Locked
QAM 256
24
549000000 Hz
9.9 dBmV
40.3 dB
0
0
25
Locked
QAM 256
25
555000000 Hz
9.8 dBmV
40.3 dB
0
0
26
Locked
QAM 256
26
561000000 Hz
10.0 dBmV
40.3 dB
0
0
27
Locked
QAM 256
27
567000000 Hz
10.0 dBmV
40.9 dB
0
0
28
Locked
QAM 256
28
573000000 Hz
10.0 dBmV
40.3 dB
0
0
29
Locked
QAM 256
29
579000000 Hz
10.0 dBmV
40.3 dB
0
0
30
Locked
QAM 256
30
585000000 Hz
10.3 dBmV
38.9 dB
0
0
31
Locked
QAM 256
31
591000000 Hz
10.4 dBmV
40.3 dB
0
0
32
Not Locked
N/A
N/A
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
4
5120 Ksym/sec
16400000 Hz
43.5 dBmV
2
Locked
ATDMA
3
5120 Ksym/sec
22800000 Hz
43.8 dBmV
3
Locked
ATDMA
2
5120 Ksym/sec
29200000 Hz
44.3 dBmV
4
Locked
ATDMA
1
5120 Ksym/sec
35600000 Hz
44.8 dBmV
5
Locked
ATDMA
5
1280 Ksym/sec
39600000 Hz
45.3 dBmV
6
Not Locked
N/A
Unknown
0 Ksym/sec
0 Hz
0.0 dBmV
7
Not Locked
N/A
Unknown
0 Ksym/sec
0 Hz
0.0 dBmV
8
Not Locked
N/A
Unknown
0 Ksym/sec
0 Hz
0.0 dBmV
Downstream OFDM Channels
Channel
Lock Status
Modulation/Profile ID
Channel ID
Frequency
Power
SNR/MER
Active Subcarrier Number Range
Unerrored Codewords
Correctable Codewords
Uncorrectable Codewords
1
Locked
3
45
690000000 Hz
11.0 dBmV
41.7 dB
1108~2987
0
0
0
2
Not Locked
0
0
0 Hz
0.0 dBmV
0.0 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
0.0 dBmV
2
Not Locked
0
0
0 Hz
0.0 dBmV
Current System Time:Tue Jan 24 09:10:51 2023
System Up Time00:19:31
Event Logs:
Clear LogRefresh
Time
Priority
Description
Time Not Established
Critical (3)
No Ranging Response received - T3 time-out
Jan 24 2023 08:52:55
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Jan 24 2023 08:52:55
Notice (6)
TLV-11 - unrecognized OID
Jan 24 2023 08:52:55
Critical (3)
Config File Rejected due to Invalid or Unexpected TLV 11
Jan 24 2023 08:53:03
Warning (5)
RCS Partial Service
Jan 24 2023 08:53:04
Warning (5)
RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW
Jan 24 2023 08:53:12
Alert (2)
CM Certificate Error
Jan 24 2023 08:53:16
Notice (6)
CM-STATUS message sent. Event Type Code: 4
Things seem more stable, but it's only been 15-20 minutes or so. Cable connection still says "Poor" which I guess is due to the power from the line being too high. So I guess I will wait until the Comcast/Xfinity technician comes and ask them how they can address that. Is there anything else I should communicate to them at that time? Any advice would be much appreciated. I'd really hope to have this resolved in one trip, if possible. Thank you for your knowledge on this.
Re: Cable connection issues on Comcast/Xfinity with CBR750
If you have a double/triple splitter (cap the unused ports) you can put that in line. It drops the power a bit. Might get it down to a reasonable level to see if it'd stay stable.Thats what I did with mine as it was coming in around 11-12 dbmv and had a bunch of errors/ issues. Worked well after that.
Re: Cable connection issues on Comcast/Xfinity with CBR750
Just a quick follow-up to close this thread. The solution proposed by @plemansworked! The page now reads: "Cable Connection Status: Good" in green. Also, no warnings or criticals in the event log since January 26th, when the splitter was installed. No more connection issues either. Everything has been rock-solid since then.
Cable Connection status / diagnostic, as of 2/1/2023:
CANCELAPPLY
Cable Diagnostic
Status: Good
Action: Your setup looks fine. If you are still experience an internet issue, the Netgear Cable Knowledge Base can provide additional troubleshooting info.
Internet Access:
Downstream Status:
Upstream Status:
RefreshSave 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
405000000 Hz
Locked
Connectivity State
Ok
Operational
Boot State
Ok
Operational
Security
Enabled
BPI+
IP Provisioning Mode
Honor MDD
honorMdd(4)
Downstream Bonded Channels
Channel
Lock Status
Modulation
Channel ID
Frequency
Power
SNR
Correctables
Uncorrectable
1
Locked
QAM 256
1
405000000 Hz
5.1 dBmV
40.3 dB
0
0
2
Locked
QAM 256
2
411000000 Hz
5.4 dBmV
40.3 dB
0
0
3
Locked
QAM 256
3
417000000 Hz
5.6 dBmV
40.9 dB
3
0
4
Locked
QAM 256
4
423000000 Hz
5.9 dBmV
40.3 dB
5
0
5
Locked
QAM 256
5
429000000 Hz
6.0 dBmV
40.3 dB
0
0
6
Locked
QAM 256
6
435000000 Hz
6.3 dBmV
40.3 dB
0
0
7
Locked
QAM 256
7
441000000 Hz
6.5 dBmV
40.9 dB
55
0
8
Locked
QAM 256
8
453000000 Hz
6.5 dBmV
40.3 dB
11
22
9
Locked
QAM 256
9
459000000 Hz
6.3 dBmV
40.3 dB
0
0
10
Locked
QAM 256
10
465000000 Hz
6.4 dBmV
40.3 dB
7
0
11
Locked
QAM 256
11
471000000 Hz
6.4 dBmV
40.3 dB
0
0
12
Locked
QAM 256
12
477000000 Hz
6.5 dBmV
40.3 dB
1
0
13
Locked
QAM 256
13
483000000 Hz
6.4 dBmV
40.9 dB
0
0
14
Locked
QAM 256
14
489000000 Hz
6.5 dBmV
40.3 dB
0
0
15
Locked
QAM 256
15
495000000 Hz
6.5 dBmV
40.3 dB
0
0
16
Locked
QAM 256
16
501000000 Hz
6.5 dBmV
40.3 dB
1
0
17
Locked
QAM 256
17
507000000 Hz
6.5 dBmV
40.3 dB
0
0
18
Locked
QAM 256
18
513000000 Hz
6.5 dBmV
40.3 dB
0
0
19
Locked
QAM 256
19
519000000 Hz
6.6 dBmV
40.3 dB
1
0
20
Locked
QAM 256
20
525000000 Hz
6.6 dBmV
40.3 dB
0
0
21
Locked
QAM 256
21
531000000 Hz
6.6 dBmV
40.3 dB
0
0
22
Locked
QAM 256
22
537000000 Hz
6.6 dBmV
40.3 dB
1
0
23
Locked
QAM 256
23
543000000 Hz
6.6 dBmV
40.3 dB
0
0
24
Locked
QAM 256
24
549000000 Hz
6.6 dBmV
40.3 dB
3
0
25
Locked
QAM 256
25
555000000 Hz
6.5 dBmV
40.3 dB
0
0
26
Locked
QAM 256
26
561000000 Hz
6.8 dBmV
40.9 dB
1
0
27
Locked
QAM 256
27
567000000 Hz
6.8 dBmV
40.3 dB
3
0
28
Locked
QAM 256
28
573000000 Hz
6.8 dBmV
39.8 dB
2
0
29
Locked
QAM 256
29
579000000 Hz
6.6 dBmV
40.3 dB
4
0
30
Locked
QAM 256
30
585000000 Hz
6.9 dBmV
38.9 dB
4
0
31
Locked
QAM 256
31
591000000 Hz
7.0 dBmV
38.9 dB
5
0
32
Not Locked
N/A
N/A
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
4
5120 Ksym/sec
16400000 Hz
46.5 dBmV
2
Locked
ATDMA
3
5120 Ksym/sec
22800000 Hz
47.0 dBmV
3
Locked
ATDMA
2
5120 Ksym/sec
29200000 Hz
47.3 dBmV
4
Locked
ATDMA
1
5120 Ksym/sec
35600000 Hz
47.8 dBmV
5
Locked
ATDMA
5
1280 Ksym/sec
39600000 Hz
48.3 dBmV
6
Not Locked
N/A
Unknown
0 Ksym/sec
0 Hz
0.0 dBmV
7
Not Locked
N/A
Unknown
0 Ksym/sec
0 Hz
0.0 dBmV
8
Not Locked
N/A
Unknown
0 Ksym/sec
0 Hz
0.0 dBmV
Downstream OFDM Channels
Channel
Lock Status
Modulation/Profile ID
Channel ID
Frequency
Power
SNR/MER
Active Subcarrier Number Range
Unerrored Codewords
Correctable Codewords
Uncorrectable Codewords
1
Locked
3
45
690000000 Hz
7.8 dBmV
41.6 dB
1108~2987
0
0
0
2
Not Locked
0
0
0 Hz
0.0 dBmV
0.0 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
0.0 dBmV
2
Not Locked
0
0
0 Hz
0.0 dBmV
Current System Time:Wed Feb 1 09:43:16 2023
System Up Time6 days 00:41:41
Events log for the last week:
Clear LogRefresh
Time
Priority
Description
Jan 26 2023 09:03:30
Alert (2)
CM Certificate Error
Jan 27 2023 07:21:31
Notice (6)
DS profile config update. DS Chan ID: 45.
Jan 28 2023 05:01:49
Alert (2)
CM Certificate Error
Jan 29 2023 20:40:04
Notice (6)
DS profile config update. DS Chan ID: 45.
Jan 30 2023 05:01:46
Alert (2)
CM Certificate Error
Feb 01 2023 09:25:25
Notice (6)
DS profile config update. DS Chan ID: 45.
Power ranges from 5.1 to 7.0 dBmV now. SNR very stable from 38.9 to 40.3. I am also attaching a screenshot the tech gave me which shows the "Flux" since I don't see that listed anywhere.
Thank you both so much for your help with troubleshooting my issue. It is greatly appreciated.
Re: Cable connection issues on Comcast/Xfinity with CBR750
Just wanted to offer a quick THANKS to all on this thread. I was having the same issues, but after finding this discussion and the offered solutions, I tried them and was able to resolve my issue as well. Determining that my incoming power was too high (looking at log info), and how to reduce (by using a splitter) helped me to understand what was happening and how to fix. THANKS for your dedication to helping others !
I have an Xfinity tech coming out tomorrow... I'll review with them to see if they had other solutions they prefer, but I'm sure happy to have my internet speeds back up to useable ranges now.
