Hal - I ran a 50-foot cat-5 cable from the x10 port on the ACS directly to my Euro 18D, simply laying it on the floor all the way down the hall so it was not near the existing wiring. It still clicked.
Dexman - Cabling for desk A was formerly plugged into the x16 port on the ACS. I moved it from there to the x11 port on the ACS, and suddenly desk A had clicking on the line. The person who moved from desk A to desk B, and kept x16 the whole time, has never heard clicking on the line.
