Cẩm nang dữ liệu không dây P2

DATA NETWORK TYPES A ROUGH SORT OF TWO-WAY SYSTEMS In North America terrestrial, two-way wireless data networks can initially be sorted into private versus public systems. Private system examples include a few very large users, such as .ederal Express, and many smaller systems for public safety (police and fire departments), taxi/limo dispatch, and utilities. In private systems the infrastructure is owned, and the spectrum is licensed, by the user. Public systems are “for hire.” The end user does not own the infrastructure and has no special rights to the spectrum that carries the traffic. 2.2 PRIVATE SYSTEMS 2.2.1 Overview Private...