Comcast / Motorola sb5100 cable modem dropping connection...

Comcast / Motorola sb5100 cable modem dropping connection...
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Subject Author Date
Comcast / Motorola sb5100 cable modem dropping connection... b4serenity 05-10-2006
Posted by George Berger on May 10, 2006, 6:15 pm
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> You may want to check some of the websites out devoted to this sort of
> thing - like broadbandreports.com etc.

Hi. Thanks! I'll go there

Cheers, George

--
I know that you believe that you understood what you think I said, but I am
not sure you realize that what you heard is not what I meant.
-- Robert McCloskey, State Department spokesman (attributed)

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Posted by Ed Nielsen on May 11, 2006, 10:37 am
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While the -10dBmV downstream is perfectly fine, I would be a little
concerned about the +52dBmV transmit level. Two possibilities are:
        1) Temperature. It is possible that as the day progresses, the
increase in temperature increases the attenuation of the cable
sufficiently to push that transmit power beyond its limit, which
typically is about 56-58dBmV.

        2) At some point, noise is getting into the return path, which causes
your cable modem to transmit at a higher level than it otherwise would.
The 2 biggest types of noise that can disrupt the upstream path are
ingress and impulse noise. Ingress is stuff leaking into the cable
system from the outside world. The most common causes of leakage are
loose/substandard/corroded connectors, poorly shielded cable,
substandard passive devices (splitters, taps). These are all part of
the drop system. Impulse noise can be electrical noise getting into the
cable system if there is insufficient filtering at some point where the
2 have something to do with each other, such as a cable modem plugged
directly into a wall outlet without the benefit of a surge power strip.
Vacuum cleaners and blow dryers (things that cause sparklies on your
TV when turned on) are also sources of impulse noise.

Something is causing your cable modem to shout loud enough to be heard
by the CMTS. Sounds like sometimes it has to shout so loud that it
can't be heard.

I would call and have a tech come out and figure out why your transmit
is as high as it is.


CIAO!

Ed N.

b4serenity@gmail.com wrote:
> Does any of this help any?
>
> /////////////////////////////
> Downstream         Value
> Frequency         687000000 Hz Locked
> Signal to Noise Ratio         36 dB
> Power Level         -10 dBmV
>
>
> Upstream         Value
> Channel ID         3
> Frequency         31000000 Hz Ranged
> Power Level         52 dBmV
> ////////////////////////////////////

Posted by on May 11, 2006, 10:58 am
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Redid some splitters/connections. So far I'm still online just fine and
here are the newest readings:
Downstream         Value
Frequency         687000000 Hz Locked
Signal to Noise Ratio         38 dB
Power Level         -2 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

Upstream         Value
Channel ID         3
Frequency         31000000 Hz Ranged
Power Level         44 dBmV


Posted by Ed Nielsen on May 11, 2006, 11:23 am
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That 44dBmV is a beautiful thing!


CIAO!

Ed N.

b4serenity@gmail.com wrote:
> Redid some splitters/connections. So far I'm still online just fine and
> here are the newest readings:
> Downstream         Value
> Frequency         687000000 Hz Locked
> Signal to Noise Ratio         38 dB
> Power Level         -2 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
>
> Upstream         Value
> Channel ID         3
> Frequency         31000000 Hz Ranged
> Power Level         44 dBmV
>

Posted by Dave on May 11, 2006, 1:17 pm
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Yes, those are all good levels.


> Redid some splitters/connections. So far I'm still online just fine and
> here are the newest readings:
> Downstream Value
> Frequency 687000000 Hz Locked
> Signal to Noise Ratio 38 dB
> Power Level -2 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
>
> Upstream Value
> Channel ID 3
> Frequency 31000000 Hz Ranged
> Power Level 44 dBmV
>



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The Federal Communications Commission (FCC)
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International Telecommunication Union

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