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       * Infinity Transmiters *
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---------------VOLTAGES----------------
WHEN YOUR PHONE IS HUNG UP, THERE IS 48
DC VOLTS GOING DOWN THE LINE.  WHEN YOU
PICK UP THE PHONE, IT DROPS DOWN TO
ABOUT 15VDC.  THE BLACK BOX EXPLOITS
THIS FOR FREE CALLS SINCE BELL USES THE
VOLTAGE DROP TO START BILLING. BELL MAY
ALSO REVERSE THE POLARITY OF THE LINE
TO START BILLING.  IF YOU HAVE A TONE
PHONE THE KEYPAD WON'T WORK IF THE
POLARITY IS REVERSED.  USUALLY, THE RED
WIRE IS CALLED THE TIP SINCE IT IS THE
MORE (+) OF THE TWO WIRES. IT IS KNOWN
AS THE "TIP".  THE GREEN IS THE (-) OF
THE TWO.  IT'S KNOWN AS THE "RING".
THE BLACK AND YELLOW WIRES ARE THE
GROUND.  IT IS A GOOD IDEA TO KEEP ONE
OF THEM HOOKED UP.  I DIDN'T HAVE MINE
AND ALMOST GOT ZAPPED FROM AN LIGHTNING
STORM!