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Cable Internet Problems

Last response: in Networking
January 17, 2007 6:42:32 AM

Hey, I've been having problems with my cable internet for about a year now, and every time we call them in to check it out they just say its something on our end and they can't do anything. What will happen is randomly during the day, but mostly at late night, the internet will get very slow or just have no connectivity at all and can last 15 minutes to a day. Now when this happens I try powercycling the modem but then the modem will take about 10 minutes to connect and will be very slow. So, does this sound like it could be the modem, or is there some issue with the wiring somewhere that they are missing. When this happens the cable tv is just fine. FYI, when suggesting things to check out I am willing to bust open the outside box and I do have a multimeter that read microamps along with everything else, and a strong understanding of electricity and circuits (2nd year HVAC student). Well, thanks ahead of time for any help.

More about : cable internet problems

January 17, 2007 10:20:41 AM

Have you tried looking at the cable modem signal levels by opening a browser and going to You can also go to where they have a forum for each cable company.

January 17, 2007 3:39:19 PM

Have you tried looking at the cable modem signal levels by opening a browser and going to You can also go to where they have a forum for each cable company.


How do I see my cable modem signal levels? Nowhere in that page do I see anything about signal levels.

Edit: nevermind I was thinking of

Cable Signal: Ready
Tuning: Complete
Ranging: Complete
Data Service: Ready
Connecting: Complete
Configuring: Complete
Registering: Complete

Current State: Operational
Highest State Obtained: Operational

Forward Path:
Signal Acquired at 729.000 MHz
SNR: 38.0 dB
Received Signal Strength: 5.9 dBmV
Micro-Reflections: 42 dBc
Modulation: 256 QAM

Return Path:
Connection: Acquired
Frequency: 37.0 MHz
Power Level: 37.5 dBmV
Channel ID: 2
Modulation: 16 QAM

Data Service Details
Provisioned Address: Yes
Provisioned Time: Yes
Provisioned Configuration: Yes
Registered: Yes
BPI: Enabled

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing 00:00:02 - 01/01/1970 00:06:43 - 01/01/1970 4309
SYNC Timing Synchronization failure - Failed to acquire FEC framing 00:00:11 - 01/01/1970 00:06:44 - 01/01/1970 1820
No Ranging Response received - T3 time-out 00:00:19 - 01/01/1970 00:00:06 - 01/01/1970 107
Started Unicast Maintenance Ranging - No Response received - T3 time-out 00:45:37 - 08/10/2006 00:45:37 - 08/10/2006 1
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 timeout 03:06:10 - 10/18/2006 15:11:06 - 12/05/2006 6
SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period 17:00:22 - 10/20/2006 17:00:29 - 10/20/2006 2
DHCP FAILED - Request sent, No response 00:00:30 - 01/01/1970 00:02:22 - 01/01/1970 7
REG RSP not received 07:50:10 - 11/19/2006 08:46:45 - 01/16/2007 8
DHCP FAILED - Discover sent, no offer received 00:00:16 - 01/01/1970 00:02:15 - 01/01/1970 110
Init RANGING Critical Ranging Request Retries exhausted 15:08:33 - 12/05/2006 15:08:33 - 12/05/2006 1
Last Refresh: 11:44:51 - 01/17/2007

Well this is what I got, so under the forward path what levels should I normally be getting? When I check it when I'm having problems should it be at around what it's at now and if it's not then its the cables problem? And also on the event log, some of those things have happened thousands of times, what does this mean? And another thing I noticed, on the main page, it says computers allowed - 1. Now I often have my xbox hooked up as well as the computer could this be why I always have connectivity issues with xbox live?
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January 17, 2007 4:38:50 PM

Cable is like a party line, more people connected the slower it gets. I dumped it for FIOS.

Only one PC allowed is refereing to the fact that you are only Allowed 1 Public IP Address. So if you are using a routers you only use one Public IP Address. Your Internal (private) IP address do not count. Cable companies use a form of MAC filtering to control access. So if you have not cloned the pc used to setup the account you may have problems. You want to make user the router is doing DHCP/NAT. Otherwise the cable company can see all of your equipment.

Looking at the report it did show some connections problems. Someone with more knowledge on this would be better able to answer your question.
January 17, 2007 4:44:05 PM

You should contact your cable company for the correct signal levels.