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 on May 10, 2006, 8:37 am
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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! It will work fine and
the online light will be on the external modem and then it will just be
off and no internet for my family (and biz). Then, it will just come
back on again after a few minutes, maybe stay on for hours then off
again for awhile.

I've talked to Comcast and we did a powerdown reset on the computer and
modem and he could tell on his end what my modem was trying to do (but
not succeeding in doing = to get online) and he said that the signal
was good to the house and that many people on my street were on at that
very moment w/o any complaints. He had me test the cable channels and
they were all fine as well. A new (mega thick) line was run to our
house just a few months back (worked fine after the cable was
installed). So he said it must be the modem.

We own our modem so they offered to have us signup for their rental
service ($3?/mo) but he wasn't sure if there would be a service
/installation fee to deliver and set it up. I told him I'd just buy
another one myself.

Am I smart in doing this or should I just pay their fee and have them
do it so the servicing is all on them? I worry (and have heard about)
about them using some cheap modems that actually don't work as reliably
or as fast as the Moto Surfboard SB5100 that I now have. Yes, the irony
of that last staement about my modem being reliable has hit me!

I have some info (an error log and some specific numbers but I'm not
sure which ones are relevent here) from a Motorola diagnostics site if
that could help anybody help me.

Before I fork over my money on a new modem could it be anything else?

Thanks so much for the help!!!!


Posted by Agent_C on May 10, 2006, 11:21 am
On 10 May 2006 05:37:36 -0700, b4serenity@gmail.com wrote:

>[...]many people on my street were on at that
>very moment w/o any complaints.

They always say that... Don't take that as a given, as the tech you're
speaking to has no idea what other people are complaining about.

Ask your neighbors if they're having the same problem.

A_C

Posted by Dave on May 10, 2006, 2:23 pm
Can you access the modem to see the levels yourself?


>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! It will work fine and
> the online light will be on the external modem and then it will just be
> off and no internet for my family (and biz). Then, it will just come
> back on again after a few minutes, maybe stay on for hours then off
> again for awhile.
>
> I've talked to Comcast and we did a powerdown reset on the computer and
> modem and he could tell on his end what my modem was trying to do (but
> not succeeding in doing = to get online) and he said that the signal
> was good to the house and that many people on my street were on at that
> very moment w/o any complaints. He had me test the cable channels and
> they were all fine as well. A new (mega thick) line was run to our
> house just a few months back (worked fine after the cable was
> installed). So he said it must be the modem.
>
> We own our modem so they offered to have us signup for their rental
> service ($3?/mo) but he wasn't sure if there would be a service
> /installation fee to deliver and set it up. I told him I'd just buy
> another one myself.
>
> Am I smart in doing this or should I just pay their fee and have them
> do it so the servicing is all on them? I worry (and have heard about)
> about them using some cheap modems that actually don't work as reliably
> or as fast as the Moto Surfboard SB5100 that I now have. Yes, the irony
> of that last staement about my modem being reliable has hit me!
>
> I have some info (an error log and some specific numbers but I'm not
> sure which ones are relevent here) from a Motorola diagnostics site if
> that could help anybody help me.
>
> Before I fork over my money on a new modem could it be anything else?
>
> Thanks so much for the help!!!!
>



Posted by on May 10, 2006, 3:16 pm
Does any of this help any?

/////////////////////////////
Downstream         Value
Frequency         687000000 Hz Locked
Signal to Noise Ratio         36 dB
Power Level         -10 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         52 dBmV
////////////////////////////////////

ERROR LOG
Time         Priority         Code         Message
2006-05-10 13:34:47         3-Critical         R005.0         Started Unicast Maintenance
Ranging - No Response received - T3 time-out
2006-05-10 12:24:22         3-Critical         R002.0         No Ranging Response received -
T3 time-out
2006-05-10 12:23:57         3-Critical         T001.0         SYNC Timing Synchronization
failure - Failed to acquire QAM/QPSK symbol timing
2006-05-10 12:23:43         3-Critical         D005.0         TFTP failed - request sent -
No Response
2006-05-10 12:22:33         3-Critical         R007.0         Unicast Ranging Received Abort
Response - Re- initializing MAC
2006-05-10 12:21:54         3-Critical         R002.0         No Ranging Response received -
T3 time-out


Posted by Bit Twister on May 10, 2006, 3:32 pm
On 10 May 2006 12:16:22 -0700, 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
> 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         52 dBmV

at a glance you seem to be riding on the end of the power level specs.
Here are suggested working ranges for solid operation. Values are from mine:

Motorola Surboard SB5120 QAM 256 (Working range)
Down Power -4 dBmV (-10 and +10 dBmV)
SNR 37 dB (higher than 33dB)
Up Power 48 dBmV (30 and 55dBmV)


Anytime you lose the connection, get the values.

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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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