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luvdodo
join:2009-06-16
Gainesville, VA

luvdodo

Member

[Connectivity] Internet Connection keeps dropping....

Hi Folks!

I have severe issues with internet connection dropping several times a day. I called comcast, here's a summary -

6/13 - Asked to replace modem and router. Spent $200 got a new set (Surfboard modem + Belkin N+ wireless router)
6/14 - Same issue. Ticket open for tech visit
6/16 - Tech arrives, says all fine at home, must be the node or congestion. Has no further response.
6/16 - Spoke to another agent, says lines seems fine.

Here's a snapshot of the log from modem. Please let me know if you see any potential issues that could be fixed -

1970-01-01 00:00:20 3-Critical D001.0 DHCP FAILED - Discover sent, no offer received
1970-01-01 00:00:11 3-Critical R005.0 Started Unicast Maintenance Ranging - No Response received - T3 time-out
1970-01-01 00:00:04 6-Notice M571.1 Ethernet link up - ready to pass packets
2009-06-16 16:28:09 6-Notice M573.0 Modem Is Shutting Down and Rebooting...
2009-06-16 16:28:09 3-Critical Ô7954.20 Resetting the cable modem due to docsDevResetNow
1970-01-01 00:00:14 3-Critical D001.0 DHCP FAILED - Discover sent, no offer received
1970-01-01 00:00:03 6-Notice M571.1 Ethernet link up - ready to pass packets
1970-01-01 00:00:02 6-Notice M571.4 Ethernet link dormant - not currently active
2009-06-16 16:26:27 6-Notice M573.0 Modem Is Shutting Down and Rebooting...
2009-06-16 16:26:27 3-Critical Ô7954.20 Resetting the cable modem due to docsDevResetNow
1970-01-01 00:04:36 3-Critical D001.0 DHCP FAILED - Discover sent, no offer received
1970-01-01 00:04:21 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:04:19 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:04:19 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:04:18 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:04:17 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:04:09 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:04:08 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:04:07 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:04:06 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:04:06 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:04:04 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:04:04 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:04:01 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:00:08 6-Notice M571.1 Ethernet link up - ready to pass packets
1970-01-01 00:00:08 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:00:02 6-Notice M571.4 Ethernet link dormant - not currently active
2009-06-16 12:03:03 6-Notice M573.0 Modem Is Shutting Down and Rebooting...
2009-06-16 12:03:03 3-Critical R004.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance o
2009-06-16 12:03:03 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:45:00 3-Critical D001.0 DHCP FAILED - Discover sent, no offer received
1970-01-01 00:44:48 3-Critical R002.0 No Ranging Response received - T3 time-out (US 6)
1970-01-01 00:44:43 3-Critical R003.0 Init RANGING Critical Ranging Request (17) Retries exhausted
1970-01-01 00:44:43 3-Critical R002.0 No Ranging Response received - T3 time-out (US 5)
1970-01-01 00:37:33 3-Critical R004.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance o
1970-01-01 00:33:40 3-Critical R002.0 No Ranging Response received - T3 time-out (US 5)
1970-01-01 00:33:32 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:33:32 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:33:21 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:33:21 6-Notice M572.0 Ds Lock Failed - Reinitialize MAC...
1970-01-01 00:33:20 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:33:20 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:33:09 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:33:09 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:32:59 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:32:59 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:32:48 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:32:48 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:32:38 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:32:38 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:32:27 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:32:27 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:32:16 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:32:16 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:32:06 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:32:06 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:31:55 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:31:55 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:31:45 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:31:45 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:31:34 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:31:34 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:31:23 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:31:23 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:31:13 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:31:13 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:31:02 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:31:02 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:30:52 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:30:52 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:30:41 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:30:41 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:30:30 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:30:30 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:30:19 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:30:19 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:30:09 6-Notice M572.0 Ds Pulse Failed - Reinitialize MAC...
1970-01-01 00:30:08 3-Critical R004.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance o
1970-01-01 00:26:16 6-Notice M572.0 T1 No Ucd Timeout - Reinitialize MAC...
1970-01-01 00:26:16 3-Critical U001.0 No UCD's Received - Timeout
1970-01-01 00:26:05 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:26:03 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:26:02 3-Critical R004.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance o
1970-01-01 00:24:49 3-Critical R002.0 No Ranging Response received - T3 time-out (US 8)
1970-01-01 00:24:43 3-Critical R004.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance o
1970-01-01 00:23:28 3-Critical R002.0 No Ranging Response received - T3 time-out (US 6)
1970-01-01 00:23:21 3-Critical R004.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance o
1970-01-01 00:22:36 3-Critical R005.0 Started Unicast Maintenance Ranging - No Response received - T3 time-out
1970-01-01 00:22:07 3-Critical R002.0 No Ranging Response received - T3 time-out (US 5)
1970-01-01 00:22:01 3-Critical R004.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance o
1970-01-01 00:18:21 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:18:21 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:18:21 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:18:19 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:18:19 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:18:02 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:18:02 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:17:59 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:17:59 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:17:57 3-Critical R004.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance o

fuziwuzi
Not born yesterday
Premium Member
join:2005-07-01
Palm Springs, CA
Hitron EN2251
Nest H2D

fuziwuzi

Premium Member

If you own your own modem, Comcast will ALWAYS blame it, no matter what they might know otherwise (at least that has been my experience. The only suggestion I can give you is that every time, and I mean every time, the connection drops, call and report it to them. They'll tell you the same thing, but if you keep calling (keep a log yourself of your calls and time) eventually they will get around to fixing the problem. That seems to have worked here. It took over 3 dozen calls in a one week period to finally get them to act.
wanger
join:2008-04-20
Reading, PA

wanger to luvdodo

Member

to luvdodo
Why not try here first: »Comcast High Speed Internet FAQ »How To Get Help!.
damox
Premium Member
join:2002-01-07
Olympia, WA

damox to luvdodo

Premium Member

to luvdodo
Here is a possibility. If you have a wireless router, which you indicated you did, and it is placed too close to the modem, that could cause you to experience the drops that you mentioned. If the two devices are close to each other, you might want to temporarily try eliminating the wireless router and see what happens. I know it sounds unlikely, but I've seen it with my own eyes, and a good friend of mine went through a few modems before he figured out the cause. This might not be the problem at all, but I just thought I'd throw it out there to give you something to try.
nickcerda
Premium Member
join:2002-09-26
Gary, IN

nickcerda to luvdodo

Premium Member

to luvdodo
I'm actually having the same issue. It happens at random times throughout the day and it usually lasts for about an hour. In that time I reset the modem and my router but nothing helps. This is my most recent log after I reset modem to factory defaults.

2009-06-17 11:41:05 5-Warning B605.10 Map Reject - Downstream Traffic Flow Not Mapped to BPI+ SAID (EC=8)
1970-01-01 00:00:05 3-Critical R002.0 No Ranging Response received - T3 time-out
1970-01-01 00:00:02 4-Error C216.0 DCC rejected parameter invalid for context
2009-06-17 11:40:18 6-Notice E112.0 SW download Successful - Via Config file
2009-06-17 11:39:43 6-Notice E102.0 SW Download INIT - Via Config file d11_m_sb5100_speedtier_c01.cm
1970-01-01 00:04:22 3-Critical R002.0 No Ranging Response received - T3 time-out
1970-01-01 00:03:54 3-Critical D001.0 DHCP FAILED - Discover sent, no offer received
1970-01-01 00:00:36 3-Critical R002.0 No Ranging Response received - T3 time-out
1970-01-01 00:00:32 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:00:17 3-Critical T002.0 SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:00:17 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:00:37 3-Critical R002.0 No Ranging Response received - T3 time-out
1970-01-01 00:00:32 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:00:41 3-Critical R002.0 No Ranging Response received - T3 time-out
1970-01-01 00:00:33 3-Critical T001.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing

izeus
@comcast.net

izeus

Anon

I'm having the same issues. I'm in NW burbs of Chicago on the 16/2 teir (D3 Blast).

I think there is an issue with the configuration file d11_m_sb5100_speedtier_c01.cm. Comcast swapped out my modem and ran new coax all the way from the modem to the pole. Still the same issues. They came back today and took the newly swapped modem in for analyzation. They've left me with a Ambit cable modem instead of motorola sb5100.

In Januaray I was getting speeds of 35mb down and 8mb. Now I can't get over 20mb sometime over the past couple of months they capped me and in doing so have also introduced some block sync issues. We can only hope the engineers read these forums. The technitions that come to the house can't help and certainly the customer service can't help.

Since I work from home, my plan is to call everyday until they fix it. The more people who call the more attention this issue will receive.
Stalker
join:2002-03-19
West Paducah, KY

1 edit

Stalker to luvdodo

Member

to luvdodo
It is not your modem or is it your router. I have had Comcast for 4 years and constantly still get frequent disconnects.

I will say on a 12 month average of service I get 9 months of what they advertise 24/7...The other 3 months are up in the air!

I always call when it is out for more than an hour or more and they are always good at sending out service techs and even always give me a 20 dollar credit on my bill if I ask, but your post tells me it is not me locally and is widespread looks like.

koshoka
join:2006-12-01
Pottsville, PA

koshoka to luvdodo

Member

to luvdodo
What are your modem levels?
ComcastSucks5
join:2005-11-12
Eldorado, OH

ComcastSucks5 to luvdodo

Member

to luvdodo
Im south of chicago and I been dropped around 30 times to night alone.I been getting many drops lately,but the past 2 days really bad.
rnugent
join:2008-03-11
Campbell, CA

rnugent to luvdodo

Member

to luvdodo
I have had the same issues since upgrading to the extream teir last month. I have a brand new Motarola SB6120 modem, tried and true Linksys router.

Channel ID 4 1 2 3
Frequency 831000000 Hz 813000000 Hz 819000000 Hz 825000000 Hz
Signal to Noise Ratio 33 dB 34 dB 34 dB 34 dB
Downstream Modulation QAM256 QAM256 QAM256 QAM256
Power Level
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
-11 dBmV -12 dBmV -12 dBmV -12 dBmV

Channel ID 12
Frequency 37000000 Hz
Ranging Service ID 2556
Symbol Rate 5.120 Msym/sec
Power Level 45 dBmV
Upstream Modulation [3] QPSK
[3] 64QAM

Ranging Status Success

Channel ID 4 1 2 3
Total Unerrored Codewords 28923069 28947752 28948017 28816576
Total Correctable Codewords 6437 0 0 13462
Total Uncorrectable Codewords 20576 1601 1435 121280

Logs for the last few weeks -

Jan 01 1970 00:00:37 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:04:12 3-Critical R03.0 Ranging Request Retries exausted;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:03:50 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jun 19 2009 21:24:51 3-Critical C206.0 DCC aborted unable to communicate on new upstream channel;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jun 19 2009 21:24:51 3-Critical R03.0 Ranging Request Retries exausted;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jun 19 2009 21:24:33 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:04:01 3-Critical R03.0 Ranging Request Retries exausted;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:03:54 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jun 08 2009 12:53:41 3-Critical R03.0 Ranging Request Retries exausted;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jun 08 2009 12:53:41 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jun 05 2009 07:38:19 3-Critical R03.0 Ranging Request Retries exausted;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jun 05 2009 07:38:06 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 01:10:38 3-Critical R03.0 Ranging Request Retries exausted;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 01:10:29 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 01:08:04 3-Critical R03.0 Ranging Request Retries exausted;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 01:07:42 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 01:04:16 3-Critical D01.0 DHCP FAILED - Discover sent, no offer received;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 01:03:40 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 01:03:08 3-Critical D01.0 DHCP FAILED - Discover sent, no offer received;CM-MAC=00:22:10:2b:63:ee;CMTS-MAC=00:01:5c:31:cd:c6;CM-QOS=1.1;CM-VER=3.0;