Solved Cable modem connectivity issue

Discussion in 'Internet and Email' started by DangerousPirate, May 15, 2011.


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  1. DangerousPirate Bronze Member

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    I have been having some connectivity issue with my Motorola SB5101 modem. Fortunately it happens mostly during the summer, where for some reason the modem would restart itself and the light would be stop and blinks on the "Send" light. The "Power" and "Receive" lights are the only two lights that stays fully illuminated. However when it hits down to the "Send" light it gets stuck there and stays there continuously blinking until it restarts itself once again. The rest of the lights underneath it (the "Online" & "Activity" lights) never gets a chance to turn on. This occurrence is very spontaneous, where it very unpredictable which makes it difficult to call for a service repairman when the appointment won't be til the next day. I have call Charter Communications multiple times where they seem to be unable to connect to the modem. It been working fine mostly throughout the year, but when it hits the summer abnormality happens, and it have been happening for many summers now. I have tried turning everything off for 30 seconds and sometimes it works and others doesn't. It just seems it wants to work again only when it wants to.

  2. Hengis PCHF Manager

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    Hi and welcome back.

    I used to have the predecessor to this model about 6 years ago when I had cable. The only time it went wrong and displayed similar issues to yours (random disconnects) was when the line attenuation needed tweaking and for that I needed to get an engineer out.

    Your problem could be similar or your modem could be developing a fault.
  3. DangerousPirate Bronze Member

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    Should I tell the repairman when he arrives that it's been working terribly in the past few summers, but works fine during the when school's in session? How is he going to diagnose the issue if it's only visible when he's not there?
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  5. DangerousPirate Bronze Member

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    If this helps I have checked the router's page and this is the information I have received:

    [FONT=Arial,Helvetica]Downstream[/FONT] [FONT=Arial,Helvetica]Value[/FONT] Frequency643750000 Hz Signal To Noise Ratio35.9 dB Power Level-8.0 dBmV
    The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
    [FONT=Arial,Helvetica]Upstream[/FONT] [FONT=Arial,Helvetica]Value[/FONT] Channel ID2 Frequency29000000 Hz Power52.5 dBmV
    Unfortunately I would provide you my logs but it was cleared after when I hit "Reset to Factory Defaults". However I do remember it saying a lot of T3 Time Outs.
  6. Hengis PCHF Manager

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    All related information is pertinent. The fact that, when the kids are home around you, the line bombs, could be an indication of a line fault (contention ratio). You should definitely provide them with that info.
  7. Xeno1 Tech Member

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    If you go to DSLReports they have a forum just for charter subscribers where you can talk to a tech one on one. They can access your modems log and look and see if they see a problem and then send out the appropriate techs. Here's a link to the forum, you'll just have to register first. - https://secure.dslreports.com/forum/charterdirect

    I frequently post there when I have similar issues and they are good about getting a tech out quickly. If you go through your local office they don't always send out someone with the experience necessary to diagnose the problem. They usually just send out the first person available in your area.
  8. Hengis PCHF Manager

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    Excellent, thanks Xeno.
  9. Xeno1 Tech Member

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    You're welcome. I have lots of experience dealing with Charter unfortunately.
  10. DangerousPirate Bronze Member

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    Yeah splendid job Xeno1 I'll give it a try*ye%
  11. Xeno1 Tech Member

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    When I was getting a whole lot of T3 timeouts it was being caused by expansion/contractions issues in my dropdown and as soon as they replaced it it was all good again. Since you say it happens more in the summer that could definitely be the problem.
  12. DangerousPirate Bronze Member

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    Sorry I am late but a realized a few months ago it was actually a faulty splitter, now everything seems to work smoothly with a new one. ;)
  13. Xeno1 Tech Member

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    Thanks for letting us know DangerousPirate.

    Marked as solved. Let us know if there's anything else we can help you with.

    Hope to see you around the forum.

    This thread is now marked as Solved and has been closed. If the problem re-occurs, please start a new thread and if it has a bearing on your original thread then please state this and a member of staff will supply the link to the original post.

Cable modem connectivity issue

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