Ethernet wiring troubleshooting

Hi everyone,
This is a bit off-topic, but I am hopeful someone out there can help. I am attempting to run an ethernet cable from my Airport Extreme-N base station in my living room to my Airport-G base station in the bedroom. After installing plugs on either end of the cable, I tested the line with a LAN tester. The first 7 conductors were OK, but plug position #8 was activated by the sending device's ground signal (which is the 9th signal sent to the receiver). I'm not sure how this is happening since ethernet lacks a ground conductor. Anyone have any thoughts about remedying this?

Which wiring standard are you using: T568A or T568B? I'll assume it's T568A as it is the one most commonly used. I'll also assume that you wired for a straight-thru configuration and to provide support up to 100Base-TX.
If this is the case, let's double-check the pin-outs:
Pin 1: White/Green (Transmit+)
Pin 2: Green (Transmit-)
Pin 3: White/Orange (Receive+)
Pin 4: Blue (Unused)
Pin 5: White/Blue (Unused)
Pin 6: Orange (Receive-)
Pin 7: White/Brown (Unused)
Pin 8: Brown (Unused)
For reference looking at the plug with the tab down, pin 1 is the rightmost location.

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