Which type is your connection, wifi or wired?
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Have you visited websites which test the quality of your hookup?
For instance:
Look for a diagram of the globe, click Start Test:
www.pingtest.net
Don't forget to type an answer to the proof of humanness question:
www.dslreports.com/pingtest
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Sometimes it matters how far you live from a central switching depot. Do you know if there is a critical distance?
Do you have advice from CenturyLink what you can expect, in regard to quality of service?
Did they say you might need additional amplifiers, boosters, splitters, etc.?
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1) Does an End-User Signal Booster exist for consumer use?
In a wifi hookup these might be in the form of a larger antenna, or an amplifier. Haven't heard of this sort of thing for direct ethernet.