After installing VONAGE on my system, i encountered BAAAAAD and SLOOOOOWWWW connections. I was stumped. I had at least three different techs out to look. I finally got a great repairman in to look at my system. He saw that somebody (an old cable guy from years before) had previously installed a AC powered signal booster directly into the INTERNET line, (which was originally cable only) He told me that the booster was boosting the signal so fast and hard that it burnt out my cable modem!!
He removed it from the circuit reran my cables to shorten them some and TADA!! I have a cable INTERNET that runs on average 2.88mbs Down and 248.16Kb/s
Here is the results from a test I just ran on website: READ ALL THE WAY TO BOTTOM FOR THE CHARTER CANBLE "MODEM" website also
TCP/Web100 Network Diagnostic Tool v5.2.1e
DO NOT USE YOUR CONNECTION WHILE TEST IS RUNNING
click START to begin
Preparing Speed test . . . . . . . . . . . . . . . . . . Done
running 10s outbound test (upload) . . . . . 248.16Kb/s
running 10s inbound test (download) . . . . . . 2.85Mb/s
Your speed is 51.97 times faster than 56Kb dial up
Your PC is connected to a Cable/DSL modem
click START to re-test
If you need to get ALL the data on your cable modem from Charter. here is a great tool as well. You may need to call the company to get the right logins.
AND ALSO TRY:
Good luck and let us know how it goes!!