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 Ed Nielsen on May 13, 2006, 10:03 am
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I don't really know much about log entries, but mine often indicates
"3-Critical        R02.0        No Ranging Response received - T3 time-out."

With your numbers being what they are (especially the SNR) and the fact
that no neighbors are experiencing the same issues (especially if 1 of
them is connected to the same tap (cable goes to the same pedestal as
yours), the cable modem seems to be the most likely culprit.


CIAO!

Ed N.

b4serenity@gmail.com wrote:
> No new modem yet but here's the latest error log; Does this indicate a
> bad signal from Comcast or still possibly a Modem problem? Any help
> appreciated!!
>
> Time         Priority         Code         Message
> 2006-05-12 17:46:54         3-Critical         R002.0         No Ranging Response received -
> T3 time-out
> 2006-05-12 17:46:44         3-Critical         T001.0         SYNC Timing Synchronization
> failure - Failed to acquire QAM/QPSK symbol timing
> 2006-05-12 17:46:24         3-Critical         R002.0         No Ranging Response received -
> T3 time-out
> 2006-05-12 17:46:04         3-Critical         R007.0         Unicast Ranging Received Abort
> Response - Re- initializing MAC
> 2006-05-12 17:45:47         3-Critical         R002.0         No Ranging Response received -
> T3 time-out
> 2006-05-12 17:45:42         3-Critical         T001.0         SYNC Timing Synchronization
> failure - Failed to acquire QAM/QPSK symbol timing
> 2006-05-12 17:45:21         3-Critical         R002.0         No Ranging Response received -
> T3 time-out
> 2006-05-12 17:45:07         3-Critical         R007.0         Unicast Ranging Received Abort
> Response - Re- initializing MAC
> 2006-05-12 17:44:49         3-Critical         R002.0         No Ranging Response received -
> T3 time-out
> 2006-05-12 17:44:43         3-Critical         R007.0         Unicast Ranging Received Abort
> Response - Re- initializing MAC
> 2006-05-12 17:41:28         3-Critical         R005.0         Started Unicast Maintenance
> Ranging - No Response received - T3 time-out
> 2006-05-12 13:25:23         3-Critical         T001.0         SYNC Timing Synchronization
> failure - Failed to acquire QAM/QPSK symbol timing
> 2006-05-12 13:25:19         3-Critical         T002.0         SYNC Timing Synchronization
> failure - Failed to acquire FEC framing
> 2006-05-12 13:25:19         3-Critical         T001.0         SYNC Timing Synchronization
> failure - Failed to acquire QAM/QPSK symbol timing
> 2006-05-12 13:25:14         3-Critical         T002.0         SYNC Timing Synchronization
> failure - Failed to acquire FEC framing
> 2006-05-12 13:25:12         3-Critical         T001.0         SYNC Timing Synchronization
> failure - Failed to acquire QAM/QPSK symbol timing
> 2006-05-12 13:25:12         3-Critical         T002.0         SYNC Timing Synchronization
> failure - Failed to acquire FEC framing
> 2006-05-12 13:25:11         3-Critical         T001.0         SYNC Timing Synchronizatio
>

Spring Sale Save 20% Banner - Sale Ended 5/3/07 So Updated to NonPromo Ad
Posted by $Bill on May 13, 2006, 8:40 pm
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Ed Nielsen wrote:

> I don't really know much about log entries, but mine often indicates
> "3-Critical        R02.0        No Ranging Response received - T3 time-out."
>
> With your numbers being what they are (especially the SNR) and the fact
> that no neighbors are experiencing the same issues (especially if 1 of
> them is connected to the same tap (cable goes to the same pedestal as
> yours), the cable modem seems to be the most likely culprit.

Geez - if you know your neighbors that well, swap modems with one of
them and see what happens.


Posted by Andrew Rossmann on May 10, 2006, 5:24 pm
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[This followup was posted to comp.dcom.modems.cable and a copy was sent
to the cited author.]

b4serenity@gmail.com says...
> 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.

When the modem is offline, what lights are blinking? If the receive
light just blinks continuously, it is trying to find the downlink signal
(receive signal strength or too much noise.) If the receive light is
solid, but the send light is blinking, it is trying to establish the
uplink (same potential problems as downlink.)

For a weak incoming signal, you can use a broadband compatible RF
amplifier. These allow the upstream signal to pass with minimal loss. It
should be placed as close to where the cable comes into your house as
possible. I would avoid the Radio Shack crap amps and get the Motorola
484095-001-00 amp if you can find it. A Google search will find alot of
sites. It's also commonly available at Circuit City, but at full price.

--
If there is a no_junk in my address, please REMOVE it before replying!
All junk mail senders will be prosecuted to the fullest extent of the
law!!
http://home.att.net/~andyross

Posted by on May 11, 2006, 8:03 am
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Andrew, and everyone else, thanks for all thew responses!

When the modem is offline (no online light) the recieve light sometimes
blinks first then usually turns solid and the send light blincks about
once per second. The PC/activity light blincks at a faster rate and
sometimes I've seen it solid. Obviously, the power light is on. Then
for seemingly no rhyme or reason the online light will come on and
everything is fine.

I thought the problem was fixed yesterday when was mainly on
especially after removing the 2 way splitter from the wall connection
(moden on one end and TV on the other). That bumped my signal about
3dbs and I stayed online longer than anytime in the last week. Then
right b4 an ebay auctiuon was about to end (!!!) the modem went offline
for the rest of the night. Then , this morning it's back on. I'm going
to rework a splitter connection at the street/house connection and get
another 3dbs. That should get my modem signal to about -4 or -5.
Does it have anything to do with people coming back from work and using
Comcast and lowering the signal (although I have lost the connection in
the day time as well)? Are the numbers I posted too low and it's a
Comcast signal problem? What's the minimum signal requirements for a
reliable signal?

Thanks again for the help!!!

John


Posted by on May 11, 2006, 8:24 am
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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?


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