The I-211M-L modem is actually equipped to run on backup battery power, but by default, it will only keep phone service online. Data and television services are normally switched off when the ...
[Bill Porter] put together a quick tutorial where he makes a 14.4V 2.2 AH battery for about $10. He picked up a set of cable-modem backup batteries (used to make sure your bundled phone service ...
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