RM>Exactly. The transformer was a little 1.5-inch square unit that plugged
  >into the AC receptical, and the secondary side was the yellow & black
  >that fed into the phone to light the keypad to the Princess & Trimline
  >phones. Since those type of phones are rarely in use anymore, the Y&B
  >pair is no longer used as a power line and is used for an additional
  >phone line.
Got it, thanks.
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