I'm using a Motorola SB5100 cable modem with Adelphia's Cable Internet service. My machine is Windows XP, SP1.
Ever since I got the service, it will sometimes work super for a few days. Then the modem appears to loose connectivity. Sometimes the loss is only for 20 minutes. Sometimes its a few hours. However, during the current outage, its been several days. It has never gone longer than a few hours before.
The Adelphia tech on the phone says all he can do is send a tech. So, the tech guy is coming Saturday to see what's wrong. They have been several times before but the connectivity has always been on when they came by due to the intermittent nature.
So, I thought it would be a good idea to get signal readings from the cable modem to show the technician in case it has came back on when he visits.
In the cable modem log file, I get these error messages:
Init ranging critical ranging request retires exhaused No ranging response received--t3 timeout ucd invalid or channel unusable
Just before those, I get:
SYNC Timing Synchronization failure--failed to acquire FEC framing SYNC Timing Synchronization failure--failed to acquire QAM/QPSK symbol timing
So, I'm not sure what those mean.
If I go to the configuration page for my cable modem (192.168.100.1) in the browser and check the signal strength, here is what I get. I also just hit F5 to keep refreshing the page every second or so to see if the values were fluctuating. I did the refresh thing every 2 or 3 seconds for a minute to see how the values changed.
DOWNSTREAM The downstream signal to noise ratio ranged from 21-37 dB. The downstream power level never changed from -19 dB.
UPSTREAM The power level was rarely the same between consecutive refreshes. It seemed to fluctuate wildly from 11 at the lowest to 55 dBmV at the highest.
Do these numbers indicate a problem?
Also, when the service is working, I have noticed that general type burst traffic such as simple web pages come up fine. However, something that uses continual traffic doesn't seem to work well at all.
For instance, I have MLB pass and sometimes watch live games online. The video will often freeze for a few seconds, go thru cycles of having artifacts in the video, etc. I have the same problem with trying to watch a news report video on some of the new sites. Video just seems really jerky across the Internet.
Audio feeds across the Internet are also problematic.
I'm not sure if my modem is hosed or if I have some other issue?
Also, I don't know if this would matter. I live in some apartments that were built in 1985. So, the coax cable in the walls is the older RG 58 style instead of the newest RG6. Could that be causing a problem?