Because each country regulates their spectrum use independently, the availability of operating licenses will vary in every country. The use of TDMA enables the base station modem and radio to be shared by hundreds of subscriber terminals, lowering overall system costs. It also allows dynamic bandwidth allocations for handling data by utilizing unused bandwidth. The range of any wireless link depends on the frequency band, configuration, and climate zone. The higher the frequency band, the shorter the range.
Security management provides function partitioning and restricted access capabilities.
The Nokia CityHopper system allows user security managers to define and modify user classes, assign each user to a class and provide them with an access level. As in all high bandwidth wireless applications, a direct line of site is required. Nokia CityHopper is a combination of ATM and CellMAC technologies that guarantees a powerful bandwidth allocation. This enables the operator to provide, for example, fixed voice services if required. Nokia CityHopper products operate in a licensed spectrum.