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DOCSIS 3.0 Netgear 3000DCG signal strength

We just acquired this modem from a COX solutions store yesterday.  How do I modify the signal strength -- it is extremely weak.    We live in a two story home that is under 2000 sq ft.  The modem is upstairs in my office and the signal is weak in this room also.

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Per the manual, the default setting is Max power and I can't find any documentation on how to change it.  Two suggestions:  if you can, change the location of the device.  A small shift can make a difference if WiFi coverage.  Also, you may need a repeater or two to get full coverage in your home.