Very simple. Unplug the working internet modem from the wall, place the 90 degree fitting on the wall plate, plug the coax cable back into the fitting, the modem will not turn on (yes I waited a few minutes). Remove 90 and reconnect without them, the modem shows up and works. Repeat: same result - nothing. Meter continuity check: everything seems to be ok. The result did not work in a real application.
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