U

Sunday, September 15th, 2024 7:54 PM

Replace faulty modem

Two to three times a day the cable modem (XB7, rented) goes down.  I've checked and everything inside the local network works fine during the outages and I cannot log into the modem during these times.  I've tried both rebooting and factory reset but neither works.

What do I need to do to get the modem replaced?

Gold Problem Solver

 • 

26K Messages

2 months ago

Chances are the XB7 is OK, and the problem is the link between your gateway and Comcast's network. Network connection problems 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 Connection Troubleshooting Tips. If you still need help, please post your Internet plan speed and the following information from your modem or gateway (from http://10.0.0.1):

  • uptime
  • downstream: power levels, SNR (or MER), and error counts for all channels
  • upstream: power levels for all channels
  • complete event log, if available (Be sure to remove or blot out any MAC addresses. Forum security processing considers them "personal information" and may prevent the event log from posting if these are present.)

Copy and pasted text is preferred over images. Be aware that, if you post any images, your message will be made Private for a time, as all images must be approved by the Forum Moderators before the messages containing them become generally visible.

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.

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.

(edited)

5 Messages

@BruceW​ 

  • Internet Plan Speed: 1200 (1.2Gb/s down, 35Mb/s up)
  • uptime: 0 days 18h: 5m: 53s <-- I last rebooted it yesterday afternoon so this is in line with that
  • downstream: power levelsSNR (or MER), and error counts for all channels
    • SNR
      38.3 dB
      43.7 dB
      43.6 dB
      43.6 dB
      43.5 dB
      43.4 dB
      43.5 dB
      43.4 dB
      43.5 dB
      43.4 dB
      43.4 dB
      43.6 dB
      43.6 dB
      43.5 dB
      43.5 dB
      43.4 dB
      43.4 dB
      39.2 dB
      43.2 dB
      42.8 dB
      42.9 dB
      43.0 dB
      42.9 dB
      43.0 dB
      42.8 dB
      42.9 dB
      43.1 dB
      42.8 dB
      42.7 dB
      42.5 dB
      42.4 dB
      37.7 dB
      Power Level
      1.4 dBmV
      3.0 dBmV
      2.9 dBmV
      3.0 dBmV
      2.8 dBmV
      2.9 dBmV
      2.9 dBmV
      2.7 dBmV
      2.8 dBmV
      2.5 dBmV
      2.4 dBmV
      2.4 dBmV
      2.2 dBmV
      2.1 dBmV
      1.8 dBmV
      1.8 dBmV
      1.6 dBmV
      1.2 dBmV
      1.2 dBmV
      1.0 dBmV
      0.9 dBmV
      0.9 dBmV
      0.5 dBmV
      0.6 dBmV
      0.3 dBmV
      0.3 dBmV
      0.3 dBmV
      0.4 dBmV
      0.2 dBmV
      0.5 dBmV
      0.6 dBmV
      -8.4 dBmV
    • Correctable Codewords
      179201952
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      179201952
      Uncorrectable Codewords
      13550
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      13550

  • upstream:
    • Power Level
      38.3 dBmV
      38.0 dBmV
      39.0 dBmV
      39.8 dBmV

  • complete event log:
    • Event log is empty.

5 Messages

As a note when service cuts off I cannot log into the modem (unresponsive).  That's my red flag that it's actually the modem not an upstream issue.

Expert

 • 

106.9K Messages

2 months ago

@user_rxo05l 

As an FWIW / FYI, with many models of modems, the user interface pages can not be accessed if the modem isn't online / synchronized with the ISP's system. Perhaps that's the case for you.

5 Messages

@EG​ I was unaware of that.  Thank you.

Expert

 • 

106.9K Messages

2 months ago

You're welcome ! Good luck to you !

Gold Problem Solver

 • 

26K Messages

2 months ago

Please also post the channel ID or number, frequency, and modulation type for each channel. It isn't possible to interpret the stats posted without this information.

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.

5 Messages

2 months ago

  • Internet Plan Speed: 1200 (1.2Gb/s down, 35Mb/s up)
  • uptime: 1 days 20h: 22m: 20s <-- It's gone out this morning so it's not the router rebooting.
  • downstream: power levelsSNR (or MER), and error counts for all channels
    • *Channel ID 20 is the Primary channel
      Channel ID
      20
      4
      5
      6
      7
      8
      9
      10
      11
      12
      13
      14
      15
      16
      17
      18
      19
      21
      22
      23
      24
      25
      26
      27
      28
      29
      30
      31
      32
      33
      34
      48
      Lock Status
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Locked
      Frequency
      507 MHz
      405 MHz
      411 MHz
      417 MHz
      423 MHz
      429 MHz
      435 MHz
      441 MHz
      447 MHz
      453 MHz
      459 MHz
      465 MHz
      471 MHz
      477 MHz
      483 MHz
      489 MHz
      495 MHz
      513 MHz
      519 MHz
      525 MHz
      531 MHz
      537 MHz
      543 MHz
      549 MHz
      555 MHz
      561 MHz
      567 MHz
      573 MHz
      579 MHz
      585 MHz
      591 MHz
      850000000
      SNR
      38.5 dB
      43.6 dB
      43.7 dB
      43.7 dB
      43.5 dB
      43.5 dB
      43.3 dB
      43.3 dB
      43.6 dB
      43.3 dB
      43.4 dB
      43.6 dB
      43.5 dB
      43.3 dB
      43.3 dB
      43.4 dB
      43.4 dB
      39.4 dB
      42.9 dB
      42.8 dB
      42.9 dB
      42.9 dB
      42.9 dB
      42.8 dB
      42.9 dB
      42.9 dB
      42.8 dB
      42.7 dB
      42.7 dB
      42.5 dB
      42.4 dB
      37.5 dB
      Power Level
      0.8 dBmV
      2.5 dBmV
      2.4 dBmV
      2.5 dBmV
      2.3 dBmV
      2.4 dBmV
      2.4 dBmV
      2.2 dBmV
      2.3 dBmV
      1.9 dBmV
      1.9 dBmV
      1.8 dBmV
      1.6 dBmV
      1.5 dBmV
      1.2 dBmV
      1.1 dBmV
      1.0 dBmV
      0.6 dBmV
      0.6 dBmV
      0.4 dBmV
      0.3 dBmV
      0.3 dBmV
      0.2 dBmV
      0.1 dBmV
      0.4 dBmV
      0.3 dBmV
      0.4 dBmV
      -1.0 dBmV
      0.8 dBmV
      -1.2 dBmV
      -1.2 dBmV
      -9.1 dBmV
    • Channel ID
      20
      4
      5
      6
      7
      8
      9
      10
      11
      12
      13
      14
      15
      16
      17
      18
      19
      21
      22
      23
      24
      25
      26
      27
      28
      29
      30
      31
      32
      33
      34
      48
      Unerrored Codewords
      466533036
      2645294550
      2645304426
      2645313566
      2645320114
      2645320982
      2645337147
      2645349619
      2645357511
      2645370792
      2645380902
      2645390184
      2645399329
      2645407401
      2645432733
      2645442256
      2645451865
      2645461407
      2645461026
      2645467361
      2645475207
      2645483442
      2645492344
      2645503662
      2645511735
      2645522488
      2645529323
      2645540014
      2645565376
      2645561594
      2645553532
      466533036
      Correctable Codewords
      465103165
      1
      1
      1
      351
      3630
      1992
      56
      350
      2
      1
      1
      2
      1
      1
      1
      1
      2
      1
      2
      1
      7
      1
      1
      1
      5
      12
      2
      1
      1
      13
      465103165
      Uncorrectable Codewords
      17004
      0
      0
      0
      1479
      7757
      1697
      73
      1194
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      0
      17004

  • upstream:
    • Upstream
      Channel Bonding Value
      Channel ID
      1
      2
      3
      4
      Lock Status
      Locked
      Locked
      Locked
      Locked
      Frequency
      16 MHz
      22 MHz
      29 MHz
      35 MHz
      Symbol Rate
      5120
      5120
      5120
      5120
      Power Level
      38.5 dBmV
      38.3 dBmV
      39.3 dBmV
      39.8 dBmV
      Modulation
      QAM
      QAM
      QAM
      QAM
      Channel Type
      ATDMA
      ATDMA
      ATDMA
      ATDMA

  • complete event log:
    • Logs in the last 90 days (well more like three since that's when I factory reset)
    • All logs for Last 90 Days
      [Wifi][7811]: WiFi radio radio1 is set to UP 2024/9/15 13:36:36 Notice
      [Wifi][7811]: WiFi radio radio1 is set to UP 2024/9/15 13:36:33 Notice
      [Wifi][7732]: WiFi radio radio1 is set to UP 2024/9/15 11:28:10 Notice
      [Wifi][7732]: WiFi radio radio1 is set to UP 2024/9/15 11:28:08 Notice
      [Wifi][7980]: WiFi radio radio1 is set to UP 2024/9/15 02:31:48 Notice
      [Wifi][7980]: WiFi radio radio1 is set to UP 2024/9/15 02:31:45 Notice
      [Wifi][7413]: SSID Changed 2024/9/15 00:52:47 Notice
      [Wifi][7413]: WiFi radio radio2 is set to UP 2024/9/15 00:52:47 Notice
      [Wifi][7413]: WiFi radio radio1 is set to UP 2024/9/15 00:52:45 Notice
      [Wifi][7413]: SSID Changed 2024/9/15 00:52:44 Notice
      [Wifi][7413]: WiFi radio radio2 is set to UP 2024/9/15 00:52:44 Notice
      [Wifi][7413]: WiFi radio radio1 is set to UP 2024/9/15 00:52:42 Notice
      [Wifi][7413]: SSID Changed 2024/9/14 18:38:38 Notice
      [Wifi][7413]: WiFi radio radio2 is set to UP 2024/9/14 18:38:38 Notice
      [Wifi][7413]: SSID Changed 2024/9/14 18:38:37 Notice
      [Wifi][7413]: WiFi radio radio1 is set to UP 2024/9/14 18:38:37 Notice

Official Employee

 • 

2.4K Messages

Hey there, user_rxo05l, thanks for reaching out through Xfinity Forums regarding your connection issues. Have you tried any troubleshooting to see if that helps with your connection? I work from home and I know how important it is to have the right signals! We are happy to help if you are still having issues. 

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

Gold Problem Solver

 • 

26K Messages

2 months ago

Thank you. The signal stats look OK except for #48 (850MHz) where the power level is borderline (too low). The error counts on that channel are a bit high as well, along with some of the other channels. If you can't correct these using the troubleshooting tips it would be best to have Comcast send out a tech to find and correct the problem.

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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