1. 
   Drop and insert
   In a multichannel transmission system, a drop and insert is a process that diverts (drops) a portion of the multiplexed aggregate signal at an intermediate point, and introduces (inserts) a different signal for subsequent transmission in the same position, e.g., time slot or frequency band, previou...
   Found op http://en.wikipedia.org/wiki/Drop_and_insert
   
   

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