Table: Moving Data Over The Airwaves

Some Promising Approaches
      
      TECHNOLOGY      DESCRIPTION     USES                ADVANTAGES   DISADVANTAGES
      CELLULAR      Radio modems in   Transferring files  Available over  Expensive 
      NETWORKS      laptops use cellular                  existing 
                    voice channels                        network
      CELLULAR      Packets of data   Short bursts of     Price, speed,   U.S. 
                                                                          rollouts 
      DIGITAL       fill idle gaps in data such as        reliability     behind 
      PACKET DATA   cellular network  messages                            schedule
      PRIVATE       Private radio     Bursts of data      Nearly          Expensive 
      PACKET        networks that                         nationwide      for large 
      RADIO         transmit                              coverage        transfers
                    packets of data                 
      ENHANCED      Digital radio     Fleet dispatch,     Combines        Limited 
      SPECIALIZED   networks          paging              voice and data  avail-
                                                                          ability
      MOBILE RADIO                                        all-digital
      DATA: DATA COMMUNICATIONS, BUSINESS WEEK 
      
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