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 Dave on May 11, 2006, 1:15 pm
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I don't think the 5120 is any newer than the 5100. They just justed two
different chipsets and gave them different model numbers.


>I just saw a manual on the 5100 that states it's operating range as -15
>> +15db. So, maybe the signal from comcast is OK and it's the modem
>> afterall?? This is not fun! What do you think?
>
> I may just buy the newer Moto 5120 at Wal-mart for under $60 and then
> if I still have problems get Comcast out here to increase the signal.
> Is it normal in some cases where the computer is not getting a strong
> enough signal for them to just run a seperate line to the house or is
> that always treated as more money either for the installation and/or
> monthly charges?
>



Pure Networks
Posted by Chuck Reti on May 10, 2006, 11:15 pm
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b4serenity@gmail.com wrote:

> I have broadband cable internet service from Comcast and I've been very
> happy with it until this past week. I've been having intermitant
> service to the net and it's really bugging me!
>---- snip ----<

I posted a very similar problem to this group a few weeks ago, received
a number of useful responses. Broadbandreports.com FAQs and forums are
full of reports from others with similar problems, and good
troubleshooting tips.
Since I own my modem (Moto SB5100) I decided to contact Motorola tech
support just to see what their story might be. When I read off values
from the modem signal and log pages (which were somewhat better than
yours), they said "those levels are terrible." Called Comcast, they sent
a tech out, who put his signal meter on the line, claimed all was
"within spec," and snugged up connections (no splitter in line, have a
direct drop from the pole to the modem, separate from the video
service). I showed him the modem's configuration pages with signal
levels and logs with "3-critical" errors of every kind. He was curious
how I was able to get that information on screen; he'd never seen _that_
before, how did I do that? So, I knew I was sunk. Trying to convince
Comcast something should be bumped up on their end, even just a bit,
looks like a hopeless effort.
--
Chuck Reti
Detroit MI

Posted by Ron W on May 30, 2006, 9:59 am
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Sorry I can't help -- I started having similar problems a couple of
days ago
with my Motorola SB 5120 -- occasionally "Send
Channel" light flashes. I
suspect I can improve my situation
with a little reduction in cable losses.
My
question: How do you access the cable signal levels? Is it
available via a
URL?
Thanks.


Posted by Bit Twister on May 30, 2006, 10:07 am
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On Tue, 30 May 2006 13:59:50 GMT, Ron W wrote:
> Sorry I can't help -- I started having similar problems a couple of
> days ago with my Motorola SB 5120 -- occasionally "Send
> Channel" light flashes. I suspect I can improve my situation
> with a little reduction in cable losses.
> My question: How do you access the cable signal levels? Is it
> available via a URL?

http://192.168.100.1

Values from mine:
Motorola Surboard SB5120 QAM 256 (Working range)
Down Power -3 dBmV (-10 and +10 dBmV)
SNR 37 dB (higher than 33dB)
Up Power 47 dBmV (30 and 55dBmV)

Posted by Roy on June 1, 2006, 10:17 pm
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On Tue, 30 May 2006 13:59:50 GMT, no@spam.invalid (Ron W) wrote:

>Sorry I can't help -- I started having similar problems a couple of
>days ago with my Motorola SB 5120 -- occasionally "Send
>Channel" light flashes. I suspect I can improve my situation
>with a little reduction in cable losses.
>My question: How do you access the cable signal levels? Is it
>available via a URL?
>Thanks.


go to 192.168.100.1 from your browser, you should get the modem
configuration manager. You cah look at signal and other things there.

Roy

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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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