Losing internet connection during large downloads.

Losing internet connection during large downloads.
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Subject Author Date
Losing internet connection during large downloads. Ladlenits 04-26-2007
Posted by Ladlenits on April 26, 2007, 3:27 pm
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Greetings everyone,

Ill try to keep this short and sweet. I have Charter as my cable ISP.
I have a Motorola SB5120 cable modem. I have had this setup for almost
2 years without any problems at all. Recently (about a month ago) I
began losing my internet connection during heavy downloading and then
about 5 minutes after that it would come right back (don't need to
restart the modem or anything just pops back on). I download from
newsgroups so this was when i first noticed this. After about 5
minutes of heavy downloading my connection would completely disappear,
downloads would stop and i could not get anywhere on the internet. The
strange thing was all the lights on my modem were still lit up.
I figured this must be a problem with my router so i replaced that.
Same thing happened. I figured well maybe my network card was bad,
still same thing. At this point i tried everything. I setup a new
account with a different Usenet server same thing, tried downloading
directly from a website with large files, same thing. Tried a laptop
on my network same problem so now im completely confused and ready to
give up and just live with it.
I decide what the hell i guess i could talk to Charter's tech support.
I was transfered to someone who i could tell immediately could not
speak English to well (not trying to knock the guy Ive come to expect
that now, and he works a lot harder than i do to earn a living so i
respect that). I tried explaining my situation to him and didn't get
very far so he transfered me to on of the head techs. We talked for
about 20 minutes while i my connection crashed and came back up and he
could see i was losing my connection but had no answers. He said he
opened a trouble ticket and that they would be working on it and have
it back up. Well that was 2 weeks ago and I haven't heard anything. I
have looked all over to find some similar issues and cant find
anything. I am hoping one of you out there will be my savior. If you
have any suggestions on what i can do to fix this i would realllly
appreciate it. Thanks in advance.


Posted by Robert Heiling on April 26, 2007, 3:48 pm
Ladlenits wrote:
>
> Greetings everyone,
>
> Ill try to keep this short and sweet. I have Charter as my cable ISP.
> I have a Motorola SB5120 cable modem. I have had this setup for almost
> 2 years without any problems at all. Recently (about a month ago) I
> began losing my internet connection during heavy downloading and then
> about 5 minutes after that it would come right back (don't need to
> restart the modem or anything just pops back on). I download from
> newsgroups so this was when i first noticed this. After about 5
> minutes of heavy downloading my connection would completely disappear,
> downloads would stop and i could not get anywhere on the internet. The
> strange thing was all the lights on my modem were still lit up.
> I figured this must be a problem with my router so i replaced that.
> Same thing happened. I figured well maybe my network card was bad,
> still same thing. At this point i tried everything. I setup a new
> account with a different Usenet server same thing, tried downloading
> directly from a website with large files, same thing. Tried a laptop
> on my network same problem so now im completely confused and ready to
> give up and just live with it.
> I decide what the hell i guess i could talk to Charter's tech support.
> I was transfered to someone who i could tell immediately could not
> speak English to well (not trying to knock the guy Ive come to expect
> that now, and he works a lot harder than i do to earn a living so i
> respect that). I tried explaining my situation to him and didn't get
> very far so he transfered me to on of the head techs. We talked for
> about 20 minutes while i my connection crashed and came back up and he
> could see i was losing my connection but had no answers. He said he
> opened a trouble ticket and that they would be working on it and have
> it back up. Well that was 2 weeks ago and I haven't heard anything. I
> have looked all over to find some similar issues and cant find
> anything. I am hoping one of you out there will be my savior. If you
> have any suggestions on what i can do to fix this i would realllly
> appreciate it. Thanks in advance.

I've a hunch that you'll see something interesting in your modem logs:
http://192.168.100.1/logs.htm

and your signal levels may tell us something:
http://192.168.100.1/signal.htm

Bob

Posted by Ladlenits on April 26, 2007, 11:04 pm
> Ladlenits wrote:
>
> > Greetings everyone,
>
> > Ill try to keep this short and sweet. I have Charter as my cable ISP.
> > I have a Motorola SB5120 cable modem. I have had this setup for almost
> > 2 years without any problems at all. Recently (about a month ago) I
> > began losing my internet connection during heavy downloading and then
> > about 5 minutes after that it would come right back (don't need to
> > restart the modem or anything just pops back on). I download from
> > newsgroups so this was when i first noticed this. After about 5
> > minutes of heavy downloading my connection would completely disappear,
> > downloads would stop and i could not get anywhere on the internet. The
> > strange thing was all the lights on my modem were still lit up.
> > I figured this must be a problem with my router so i replaced that.
> > Same thing happened. I figured well maybe my network card was bad,
> > still same thing. At this point i tried everything. I setup a new
> > account with a different Usenet server same thing, tried downloading
> > directly from a website with large files, same thing. Tried a laptop
> > on my network same problem so now im completely confused and ready to
> > give up and just live with it.
> > I decide what the hell i guess i could talk to Charter's tech support.
> > I was transfered to someone who i could tell immediately could not
> > speak English to well (not trying to knock the guy Ive come to expect
> > that now, and he works a lot harder than i do to earn a living so i
> > respect that). I tried explaining my situation to him and didn't get
> > very far so he transfered me to on of the head techs. We talked for
> > about 20 minutes while i my connection crashed and came back up and he
> > could see i was losing my connection but had no answers. He said he
> > opened a trouble ticket and that they would be working on it and have
> > it back up. Well that was 2 weeks ago and I haven't heard anything. I
> > have looked all over to find some similar issues and cant find
> > anything. I am hoping one of you out there will be my savior. If you
> > have any suggestions on what i can do to fix this i would realllly
> > appreciate it. Thanks in advance.
>
> I've a hunch that you'll see something interesting in your modem
logs:http://192.168.100.1/logs.htm
>
> and your signal levels may tell us something:http://192.168.100.1/signal.htm
>
> Bob- Hide quoted text -
>
> - Show quoted text -

Thanks for the help Bob.

I checked the logs and here are the problems that seem to show up:

2007-04-23 19:25:29 5-Warning D03.0 DHCP WARNING - Non-critical field
invalid in response
2007-04-23 19:25:29 5-Warning DHCP: Renew: Missing Syslog server
2007-04-20 07:25:29 5-Warning D03.0 DHCP WARNING - Non-critical field
invalid in response
2007-04-20 07:25:29 5-Warning DHCP: Renew: Missing Syslog server
2007-04-16 19:25:29 5-Warning D03.0 DHCP WARNING - Non-critical field
invalid in response
2007-04-16 19:25:29 5-Warning DHCP: Renew: Missing Syslog server
2007-04-13 07:25:29 5-Warning D03.0 DHCP WARNING - Non-critical field
invalid in response
2007-04-13 07:25:29 5-Warning DHCP: Renew: Missing Syslog server
2007-04-09 19:25:29 5-Warning D03.0 DHCP WARNING - Non-critical field
invalid in response
2007-04-09 19:25:29 5-Warning DHCP: Renew: Missing Syslog server
Here is my signal status:

Downstream
Value
Frequency 643750000 Hz
Signal to Noise Ratio 37 dB
QAM QAM256
Network Access Control Object ON
Power Level 9 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 2
Frequency 31392000 Hz
Ranging Service ID 27
Symbol Rate 2.560 Msym/s
Power Level 37 dBmV

I'm glad this might mean something to you because it is greek to
me :). Thanks again Bob.




Posted by Bit Twister on April 27, 2007, 12:57 am
On 26 Apr 2007 20:04:39 -0700, Ladlenits wrote:
>
> Downstream Value
> Signal to Noise Ratio 37 dB
> Power Level 9 dBmV
>
> Upstream Value
> Channel ID 2
> Power Level 37 dBmV
>
> I'm glad this might mean something to you because it is greek to
> me :). Thanks again Bob.

They indicate levels about what your modems is hearing and talking to
the headend and how good/noisy the signal.

Signal to noise is indication of quality of the signal.
http://en.wikipedia.org/wiki/Signal-to-noise_ratio

Downstream is level that modem receiving (hearing) the signal.
Upstream is level modem is sending (talking) to headend.

It looks like your headhend is SCREAMING at you :(
and you are talking at a normal level to the headhend. :)

Values from my setup.

Motorola Surboard SB5120 QAM 256 (Working range, my norm)
Down Power -4 dBmV (-10 to +10 dBmV, -1 dBmV)
SNR 37 dB (higher than 33 dB, 37 dB)
Up Power 43 dBmV (30 to 55 dBmV, 44 dBmV)

Posted by Bill M. on April 27, 2007, 3:08 am
wrote:

>On 26 Apr 2007 20:04:39 -0700, Ladlenits wrote:
>>
>> Downstream Value
>> Signal to Noise Ratio 37 dB
>> Power Level 9 dBmV
>>
>> Upstream Value
>> Channel ID 2
>> Power Level 37 dBmV
>>
>> I'm glad this might mean something to you because it is greek to
>> me :). Thanks again Bob.
>
>They indicate levels about what your modems is hearing and talking to
>the headend and how good/noisy the signal.
>
>Signal to noise is indication of quality of the signal.
> http://en.wikipedia.org/wiki/Signal-to-noise_ratio
>
>Downstream is level that modem receiving (hearing) the signal.
>Upstream is level modem is sending (talking) to headend.
>
>It looks like your headhend is SCREAMING at you :(
>and you are talking at a normal level to the headhend. :)
>
>Values from my setup.
>
>Motorola Surboard SB5120 QAM 256 (Working range, my norm)
>Down Power -4 dBmV (-10 to +10 dBmV, -1 dBmV)
>SNR 37 dB (higher than 33 dB, 37 dB)
>Up Power 43 dBmV (30 to 55 dBmV, 44 dBmV)

IMHO, 9 dBmV Downstream is perfectly acceptable. The rest of the
levels look good to me, too.

I would continue to check the levels periodically to see if they
fluctuate. It's possible they're intermittently moving outside of the
working range for short periods.

--
Bill

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