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192.168.100.1 for most modems.. If it doesn't work there is another way.
Signals should be ..
Downstream SNR: 33Db or higher (30 MIN.)
Downstream Power Level: -15 to +15
Upstream Power Level: +8 to +55
For reference you can use the site FAQ.. »
/faq/7124If it is in range the next step would be running a tweak test: »
/tweakthen a line quality test: »
/linequality