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My guess at $250 is based on the AFC revenues and those early revenues had only a small contribution by Embarq. Embarq itself spends over $50M in Acess per annum.
221K does not even equal Adtran's or Tellabs numbers. So, if they are number 2 they need to be over 500K DSL ports.
DSL generally is considered good when you get a 30% take rate compared to POTS. So, please figure that in when you do your calculation. They will take the revenue from the cabinet - no matter who is bending the metal. And tho, Ted Lord is with us no more (may he rest in peace) - they still design their own cabinets.