Perhaps the next and easiest thing to test is to put a terminator on the open wall jack to see if this helps.
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Originally Posted by GroundUrMast
JC's points are correct. The signals available to you are strong, you don't need an amplifier. If you have a need to split to two or more sets, the ideal method is to select a splitter with just enough ports. Unused ports need to be terminated, not left 'open' at the far end of a cable run.
John, thanks for clarifying the definition of 'test cable'.
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